YAMAHA RX-V765 - HTR-6270 AV Receiver Self diagnostic mode – Protection function and firmware update - Manual service - fix yourself

Receiver Self diagnostic mode – Protection function and firmware update -  AV receiver Repair and service - Manual Service YAMAHA RX-V765 - HTR-6270 AV

YAMAHA RX-V765 - HTR-6270

Starting Self-Diagnostic Function
While pressing TONE CONTROL AND PURE DIRECT , press the “MAIN ZONE ON/OFF” key to turn on the power.
The self-diagnostic function mode is activated.

Starting Self-Diagnostic Function in the protection cancel mode
If the protection function works and causes hindrance to trouble shoot, cancel the protection function as described below, and it will be possible to enter the self-diagnostic function mode.
(The protection functions other than the excess current detect function will be disabled.)
While pressing those TONE CONTROL AND PURE DIRECT, press the “MAIN ZONE ON/OFF” key to turn on the power and keep pressing those 2 keys and “MAIN ZONE ON/ OFF” key for 3 seconds or longer.
The self-diagnostic function mode is activated with the protection functions disabled.
In this mode, the SLEEP segment of the FL display of this unit flashes to indicate that the mode is self-diagnostic function mode with the protection functions disabled.

Canceling Self-Diagnostic Function
1. Before canceling self-diagnostic function, execute setting for FACTORY PRESET of main menu No. 24 (Memory initialization inhibited or Memory initialized).
# In order to keep the user memory stored, be sure to select PRESET INHIBITED (Memory initialization inhibited).
2. Press the “MAIN ZONE ON/OFF” key of this unit to turn off the power.

Display provided when Self-Diagnostic Function started
The display is as described below depending on the situation when the last time the power to this unit is turned off.
When the power is turned off by usual operation:
The FL display of this unit displays “NO PROTECT” then the main menu (sub-menu “1. ANALOG BYPAS” of main menu No. 1 BYPASS) a few seconds later.

When the protection function worked to turn off the power:
The FL display of this unit displays the data of protection function which worked at that time then the main menu (sub-menu “1. ANALOG BYPAS” of main menu No. 1 BYPASS) a few seconds later.
Note: At that time if you reactivate the self-diagnostic function after turning off the power once by pressing the “MAIN ZONE ON/OFF” key, “NO PROTECT” will be displayed because that situation is equal to “1. When the power is turned off by usual operation:” described above. However the protection function history is stored in memory with a backup. For details, refer to main menu No. 21 PROTECTION HISTORY.

When the protection function worked due to excess current

Cause: An excessive current flowed through the power amplifier.
Supplementary information: As current of the power amplifier is detected, the abnormal channel can be identified by checking the current detect transistor. Turning on the power without correcting the abnormality will cause the protection function to work immediately and the power supply will instantly be shut off.

Note)
# Applying the power to this unit without correcting the abnormality can be dangerous and cause additional circuit damage. To avoid this, if protection function has been activated 3 times continuously, the power will not turn on even when the “MAIN ZONE ON/OFF” key is pressed. In order to turn on the power again, disconnect the power cable of this unit from the AC outlet once and then reconnect it again.
# The output transistors in each amplifier channel should be checked for damage before applying power of this unit.
# Amplifier current should be monitored by measuring DC voltage across the emitter resistors for each channel.

When the protection function worked due to a short between speaker terminals.

Cause: The line between speaker terminals is shorted.
Supplementary information: As the excess current is detected after operation of the speaker relay, the shorted speaker terminal and the connected speaker can be identified.
Turning on the power without correcting the abnormality will cause the protection function to work immediately and the power supply will instantly be shut off.

When the protection function worked due to abnormal DC output.

Cause: DC output from the power amplifier is abnormal.
Supplementary information: The protection function worked due to a DC voltage appearing at the speaker terminal. A cause could be a defect in the amplifier. Turning on the power without correcting the abnormality will cause the protection function to work in 3 seconds and the power supply will be shut off.

When the protection function worked due to abnormal voltage in the power supply section.

Cause: The voltage in the power supply section is abnormal.

Supplementary information: The protection function worked due to a defect or overload in the power supply. Turning on the power without correcting the abnormality will cause the protection function to work in 1 second and the power supply will be shut off.

When the protection function worked due to excessive heatsink temperature.

Cause: The temperature on the heatsink is excessive.
Supplementary information: The protection function worked due to the temperature limit being exceeded. Causes could be poor ventilation or a defect related to the thermal sensor.
Turning on the power without correcting the abnormality will cause the protection function to work in 1 second and the power supply will be shut off.
# For detection of each protection function, refer to main menu described later.

History of protection function
When the protection function has worked, its history is stored in memory with a backup. Even if no abnormality is noted while servicing the unit, an abnormality which has occurred previously can be defined as long as the backup data has been stored.
For details of the history of protection function, refer to main menu No. 21 PROTECTION HISTORY. The history of the protection function is cleared when self-diagnostic function is cancelled by selecting PRESET RESERVED (Memory initialized) of main menu No. 24 or when the backup data is erased.

Initial settings used to start Self-Diagnostic Function
The following initial settings are used when starting selfdiagnostic function. When self-diagnostic function is canceled, these settings are restored to those before starting self-diagnostic function.
# Master volume: -20 dB
# Zone2 Volume: +2.5 dB
# Input: AV5 (MAIN ZONE) / AUDIO1 (ZONE2)
# Main menu: 1. ANALOG BYPASS
# Speaker setting: LARGE, Bass out to SWFR (All channels)
# Speaker impedance: 8 ohms position
# OSD: ON
# XM Power: ON (U model)

UPDATING FIRMWARE

Confirmation of firmware version and checksum
Before and after writing firmware, check the firmware version and checksum by using the self-diagnostic function menu. Start up the self-diagnostic function

Using the sub-menu, have the firmware version and checksum displayed, and note down them.

Writing method using the CD

Required Tools
# DVD or CD player (with DIGITAL OUTPUT (OPTICAL
or COAXIAL) jack)
# Optical cable (when OPTICAL jack is used)
# Digital audio pin cable (when COAXIAL jack is used)
# Firmware CD
# To make the firmware CD, download the latest
firmware from the specified download source.
# Connection
Connect this unit and DVD/CD VIA OPTICAL CABEL

Operation Procedures
1. While pressing the “STRAIGHT” key of this unit, connect the power cable of this unit to the AC outlet.
The FIRMWARE UPDATE mode is activated

2. Connect the power cable of DVD/CD player to the AC outlet.
3. Press the “STANDBY/ON” key of the DVD/CD player to turn on the power.
4. Press the “EJECT” key of the DVD/CD player to open the disc tray.
5. Put the firmware CD on the disc tray and close the disc tray.
6. Press the “PLAY” key of the DVD/CD player. Then writing of the firmware is started.
7. When writing of the firmware is completed, “Update Success”, “Please...” and “Power off!!” are displayed repeatedly.

If the display remains unchanged for longer than 10 seconds after starting the firmware CD play procedure, perform the firmware CD play procedure again from the beginning. If “FILE CORRUPTED” is displayed after “XXXXXX”, make sure that the written data is not corrupted and perform Steps 1 to 7 of “Writing method using the CD” again. If “Upgrade Failed” is displayed, perform Steps 1 to 7 of “Operation Procedures” again.
8. Press the “STOP” key of the DVD/CD player.
9. Press the “EJECT” key of the DVD/CD player to open the disc tray.
10. Remove the firmware CD from the disc tray and close the disc tray.
11. Press the “STANDBY/ON” key of the DVD/CD player to turn off the power.
12. Press the “MAIN ZONE ON/OFF” key of this unit to turn off the power.
13. Start up the self-diagnostic function and select “25. ROM VER/SUM/PORT” menu.
Using the sub-menu, have the firmware version and checksum displayed, and then check that they are the same as written ones.
* When the displayed firmware version and checksum are different from written ones, perform the “Writing method using the CD” all over again.
14. Press the “MAIN ZONE ON/OFF” key of this unit to turn off the power.

How to troubleshoot - Samsung galaxy tablet - GSM TELEPHONE GT-P7320 – power problem – touch problem – speaker problem – Charging trouble

Samsung galaxy GT-P7320: TROUBLESHOOTING 

Power On does not work

C1009 = 3.5V > 4.2V ?

Check CON1000 component and replace.

When Power key press, is R1500 is 0V ?
Check Power Key FPCB Part & C1519

MSM_PS_HOLD(R728) = 1.8V

After Check UCP400 circuit, Replace UCP400

Check U702 Power stage C794,C795 = 1.1V C787 = 1.8V, C776 = 1.8V,

After Check U702 circuit, Replace U702

Check U700 Power stage C740, C741 = 1.2V, C726 = 2.85V

After check U700 circuit, Replace U700

Check U1107 Power stage C1120 = 5V L1102 = 14~18V

After check U1107 circuit, Replace U1107

CP Power on does not work

Check the Setting-About device Baseband version

After SW D/L, recheck the Baseband version & if the reproducing, PBA is change.

Check U802 power stage C837 = 1.1V, C838 = 1.3V, C839 = 1.8V, C831 = 1.8V C832 = 2.85V

Check the U701 circuit & Replace U701

MDM _PS_HOLD = 1.8V

Check the R815,U806 circuit & replace U806

Check U600 power stage C607 = 1.1V

Check the U600 circuit & replace U600

Check the UCP600 state

Initial Failure

MDM_PON_RESET_N(C862), TP_MDM_PM_INT_N >= 1.8V(HIGH)

Check UCP400 (short, crack, etc.)

MDM2AP_WAKEUP(TP_M400), >= 1.8V(HIGH)

Check UCP600 (short, crack, etc.)

There is 32.768KHz wave forms at OSC701(C748) and OSC800(C835)

Replace OSC701 and OSC800

There is 32.768KHz wave forms at OSC701(C748) and OSC800(C835)

Replace OSC701 and OSC800

There are 19.2MHz wave forms at OSC700(C745) and 19.2MHz wave forms at OSC1100(C1104)

Replace OSC700 and OSC1100

LCD display OK?

Check the LCD part(short, crack, etc.)

Sound is OK?

Check the Audio Part(short, crack, etc.)

Insert SIM card

Check connection of HDC1001

re-connect and check again or change SIMsocket FPCB

Check the SIM Voltage. (R1033) >= 2.8

Change to the new SIM card. If it doesn`t still work SIM card after changing the SIM card, Check the UCP600 (Crack etc)

Abnormal charging

Check C1019 whether voltage is greater than 5V.

Check the TA and the DLC. (TA or DLC may not be connected properly)

Check C1101 whether the voltage reading is greater than 5V. C1011

Check U1003 chip

Check C851 whether voltage reading is greater than 4.2V

Check U803 chip (U803 chip may not work at room temperature)

Check C851 whether voltage reading is greater than 4.2V

Check U803 chip (U805 chip may not work) U805

Check C842 whether voltage is change when TA is connected

Check U803 chip (U803 chip may not work)

Microphone Part

Check main microphone function in cam recording mode

Check the status of MIC module

Replace MIC module

Check the HDC900 is connected

Connect the HDC900

L902 = 1.5V, L903 = 0.3V ? and check the soldering status

Check the U906 LDO and MIC. If there is crack, replace them

Speaker

Check speaker function. Play MP3 with maximum volume level.

Check the speaker module is soldered well.

Resolder speaker module

Check the L906,907,908,909 Signal when music is playing.

Check the U403 and near parts If there is crack, replace them

Check the C951, C954 Audio signal when music is playing

Check the U202 and near parts If there is crack, replace them

LCD

LCD is still off after PWR ON

Check the connection of HDC1100

Reconnect the HDC1100

Check the C1121 and High(about 18V)

Check the Backlight Driver IC(U1107)

Check C1110=1.8V, C1106=1.2V,C1108=3.3V

Check the PMIC(U702) DC-DC(U1100) BUCK(U1105)

Check the signal IDISPLAY_PCLK(TP1107) LCD_F(0)(TP1100)

Check the freq of C1105(19.2MHz)

Replace or resolder OSC1100

Replace LCD Module

Check the U1103

Touch Screen does not work

Check TSP Connector on Main PBA

Reconnect the SLC1200

Pin1 = 2.8 U1202 V(C1201)

Resolder or Replace U1202

U1200,1201 Pin J6 > 2.5V (C1204, C1208)

Resolder or Replace U1200,1201

U1200,1201 Pin J6 > 2.5V (C1204, C1208)

Resolder or Replace U1200,1201

Check the I2C signal of Sensor IC(R1200, R1201)

Resolder R1200, R1201

Replace TSP Module.

Arcelik BEKO LCD TV - TF CHASSIS – Service mode – Error codes – Troubleshooting – software update

Arcelik BEKO LCD TV - TF CHASSIS – Service mode – Error codes – Troubleshooting – software update 

To enter service menu, just like in the previously launched products, we press menu button of the remote control and enter 9, 3, 0, 1 in sequence for BEKO/ARCELIK brand TVs. 

For GRUNDIG brand we enter 8, 5, 0, 0. As the chassis improvement and development works go on throughout the production, service menu items may vary according to the software version. 

The following explanations are service menu settings of the current version.

This menu contains general settings of the system.TV MODE tab contains "Factory" and "Customer" options. It is used to perform factory controls and settings more efficiently and faster. On the TVs delivered to the customer, this setting is absolutely selected as "Customer." Otherwise, it will lead to customer complaints such as "TV automatically turns on after power failures" or "different functions operate from the remote control".

HDCP VERIFY: It must be checked if HDCP key is loaded or not during factory controls. HDCP key stands for ““High Bandwidth Content Protection Key”. This key is used to prevent copying of data on digital sources such as DVD or blue-ray. With HDCP, video data is transmitted from the source to the receiver as encrypted. Therefore, to watch HDCP encrypted DVDs or blue-ray, HDCP key should have been loaded on TV. On the products with HDCP installed, SUCCESS message is included.

DEBUG MODE is a feature, which is used to track software modifications made on TV during R&D stage. This setting must be "Off" on TVs delivered to the customer.

PLUG PLAY (Demo Mode): A navigation key is pressed after having completed all settings and checks in the factory. Later, "Please wait" message appears; and when you see the message "DONE", the device should be unplugged and plugged again. With this process, television will be set to its initial values before delivery. It will be proper to set Plug&Play tab after servicing. After pressing right key on the tab, EEPROMs will be loaded with factory defaults. TV can be shipped to the customer after this setting. Please note that any warning is not displayed or you do not have to exit the menu while Plug&Play is getting activated. You should be careful not to take the device into Plug&Play mode by mistake.

ATS (Automatic Tuning System) tab ensures that the channels are arranged in order after automatic search. However, there is a broadcast support to order the channels. It is active when “On” is selected. “On” should be selected in TF-chassis products.

SRS (Virtual multi-channel sound system) turns on and off SRS Tru-Surround XT HD feature. SRS Tru-Surround XT creates a sound experience surrounding the user similar to 5+1 sound systems, thanks to multi-channel audio by using two loudspeakers produced by SRS company. SRS is an optional feature that can be selected upon the customer’s request. BLUE BACK enables us to determine background when there is no picture on the screen. When "On" is selected, background will be blue; and when "Off" is selected background will be black or snowing. “On” should be selected in GRUNDIG brand products and “Off” in other products.

HOTEL tab should be set to "On" on hotel TVs, and it should be set to "Off" in other products. When the hotel model is "On", certain features designed for the hotel use are activated; the user cannot change the channels set by the service, for example, or the volume cannot be increased more than a certain level.

CI KEY VERIFY indicates if CI Key has been installed or not. This menu cannot be changed. This option should appear as “Pass” in the products with CI Plus feature. CI Key is the keyword on the card which is inserted to decrypt the broadcasting. This menu is a control indicator and changes automatically. This keyword is installed during TV production and it becomes a kind of ID for your TV when watching encrypted channels. TF-chassis products support CI+ feature. Launched in 2008, it is a new encryption standard developed with the collaboration of consumer electronics and scrambled digital broadcasting companies. So far, it was possible to copy the programmes after decoding process; however, now they cannot be copied thanks to that main IC coming with the CI Plus has a key. In this system, broadcasting is initially decoded on CI card. The broadcasting transmitted to the main IC from the CI card is also encrypted and it is decoded with CI Key, which is a factory setting and different for each TV. Thus, there will be no free encrypted broadcasting on the bare line and encrypted broadcasting cannot be copied. C+ feature is standard in all the products with TF chassis.

The settings under source configuration tab determine which sources will be on and which ones will be off depending on customer demands. In the small size products, HDMI3 and HDMI4 are off in standard (NAVAIL); and the sources of DVD and USB can be adjusted optionally. In large size products, DVD will be off in standard. In the products with LOW feature, USB, HDMI2, HDMI3, HDMI4, AV2, COMPONENT and DVD sources will be selected off. 

TV Configuration:

This menu contains configuration settings of TV. We may select amongst the menus that are being used and to be used on TV. These settings differ from the "System Configuration". This menu contains the changes which the user can directly observe.

To enter this menu, you should go to "TV configuration" from the service menu and enter the numbers 2, 3, 5, 6 in sequence. TUNER menu contains the tuner types that can be used on TV. TF chassis currently works with “Alps” branded tuners. DVBT2 (Next generation digital terrestrial broadcasting modulation) can be selected as ON/OFF depending on the customer preference, in the countries that support DVBT2 digital terrestrial broadcasting. DVBT2 is selected OFF in the products to be used in the country. In our country, TRT makes DVBT2 test broadcasting in Ankara. OSD Selection menu has "Grundig", "Beko", "Arcelik" and "OEM" selections. For Grundig products, “Grundig” is selected. This selection adds Grundig sign next to the user menu and remote control selection is “TP3”. TV brand should be selected in Beko and Arçelik products. This selection is automatically “YB1187R” in the remote control and several brand-specific menus are also added. For other brands, OEM should be selected. If the product is "Grundig", you can enter service menu by pressing "menu 8 5 0 0" keys. If "Beko", "Arcelik" or "OEM" is selected, you can use "menu and 9 3 0 1" keys.
Note: In the smaller size (19”-22”) products with TF chassis, when Arçelik, Beko or Grundig is selected under OSD selection tab, different remote control options will be displayed compared to large size products.

USB RECORDING menu indicates the television's status of USB recording. It may be selected On/Off according to customer demand. REMOTE CONTROL menu displays remote control selections for BEKO, ARÇELİK and GRUNDIG as stated in OSD Selection above. For example, GRUNDIG OSD can support several different models of remote controls and all those models can be seen under the menu. Selection of remote control may vary according to the customer demand. KEYPAD enables you to select which keypad will be used depending on the mechanical structure of the product. 4-Key, 6-key, single-key and “Joystick” options can be selected. If selected wrong, the keys will work in different functions. 6+1 (or joystick depending on option) can be selected for large size products whereas 4+1 is selected for smaller size products and single-key pad module is used for the products with LOW feature. L (SECAM L sound system) tab enables you to select "L" sound system, and it should be "On."

MEMC stands for "Motion Estimation Motion Compensation." "On" should be selected for the products that use only 100Hz panel.

7 SEGMENT DISPLAY should be selected "On" in the products with the indicators, which mechanically display the hour on the front panel. (Not TVs with LED backlight panel!!!) Generally, this feature is used on hotel TVs. ECO TV option: When "On" is selected , eco standards-compliant power consumption is ensured by turning down the backlight a bit.

ECO TV option should be selected ON for all products with TF chassis. LINE OUT (LEFT/RIGHT Audio output): If the product has line out feature, it should be selected “On”. Large and small size products with TF chassis will have LINE OUT feature in standard.

HEADPHONE tab should be selected "On" if TV has a headphone socket. Large and small size products have headphone sockets in standard.

SHOP MODE is used in the first installation at the dealers for purposes of display (Shop Mode and Home Mode screens appear). When Shop Mode is selected, the logos of various features such as CI+, SRS etc., which are supported on TV, appear on top of screen with certain intervals. SHOP MODE should be selected ON for all products. However, when the product is delivered to the customer, TV is switched back to factory settings via PLUG PLAY; and HOME MODE is selected during the first installation at the customer’s place. During the first installation, SHOP MODE is only selected at the dealers for the purpose of display.

3D TV (3 Dimensional TV Technology) is not supported in the products with TF chassis.

CEC allows you to make an HDMI connection between your TV and DVD player or video recorder and control such equipments with the remote control of the television. The products with TF chassis have CEC feature in standard.

OUTPUT POWER is used to select audio output power. Small size products with TF chassis have 3W audio output.

CABIN OPTION feature is used to create best audio performance of the cabin. Bass/treble settings vary depending on options in the existing cabins; the options have been adjusted to prevent cabin resonance and ensure best audio quality. Depending on the cabins, the list of cabin options that may take value from 1 to 7 is constantly updated.

HIDEV MONO (improvement of high audio deviation), is a feature developed to prevent imbalances that may occur on sound carrier signals due to high audio deviation in the country. It is ON for domestic products and OFF for the products sold abroad. OPTIC OUT (Digital Audio Output) feature is generally used to input digital audio to devices such as amplifier, DVD and etc.

OPTIC OUT will be available on large size products with TF chassis and not available on small size products and the products with LOW feature.

Cloner Configuration:

This menu is used to copy your selections, channel lists, user options, satellite settings and service menu settings on TV and move them to another TV. Particularly, when installing TV at the user's home, this feature will save us time as we will not have to tune satellite channels anew.

Cloning can be done from any TV with the same chassis. To enter this menu, you should navigate to "Cloner configuration" from the service menu and enter the numbers 4, 6, 5, 8 in sequence.

Copy selects what and to where we want to copy. TV to USB copies the configuration on TV to the USB. USB to TV transfers previously prepared channel list, user and satellite settings to TV.

Copy item is the name of configuration to be copied. Channel/Video Set selection enables us to transfer channels, frequencies and favourite lists that were already set. Service Set enables us to transfer service menu settings. When installing at the user’s place, this option should NOT be cloned. User Set enables us to transfer user settings (sound, brightness, TV language and etc.).

Start Cloning option starts the cloning process. Whereas TV to USB takes little time, USB to TV causes a short interruption of TV imaging. When TV automatically restarts after installation, its means cloning is completed. 

NOTES: When cloning, you should ensure that both product codes are the same. During both TV to USB cloning and USB to TV cloning, “ALL" should be selected as Copy item. When cloning between different product codes, only “Channel/Video Set” should be copied. After copying, picture settings of TV may show some differences. TV should be delivered to the customer after those settings are checked. From user menu, navigate to “Source settings” => “Program Table” (don’t select) and press 4, 6, 5, 8 keys to display cloning menu.

Bootcode Code Configuration

In the products with TF-chassis, Boot code should be updated before software updating. Boot code update is performed through the steps below.

Step 1: Please copy mboot.bin file into USB memory. (If the memory contains more than one partition, copy the file into the first partition.)

Step 2: Insert USB memory to the USB socket on the side of TV.

Step 3: Wait for 10 seconds for USB memory to be automatically mounted.

Step 4: Open service menu (MENU+8500 (Grundig)

Step 5: In Service menu, select Boot Code Configuration and press OK.

Step 6: If there is no problem, TV will automatically turn off and restart with new bootloader. If there is a problem, TV will not automatically restart.

Software Version

All versions of software and hardware can be seen under software version tab. “URSA version” tab shows the 100Hz software version installed on 100Hz TVs.

This menu is for information only, it cannot be changed. Other Menus: Other menus are closed to authorized services as they are used for R&D studies in the factory.

FAILURE/ERROR CODES

Sound but no picture, and backlight illuminated
this section  basically explain where we need to check if there is "no picture on TV" even though there are not any problems in the panel inverter. Here, we are assuming that chassis is generally in good condition as we obtain sound output from TV. When you cannot determine if the backlight is working or not due to the illumination level in the environment, you are recommended to tap on the TV's front panel lightly; if the backlight is working, you will notice a slight glowing.

Before starting controls and repairs, it is crucial to analyse and comprehend the problem exactly. In this problem, you must make sure if it is originated from the utilized source, if it is a cable connection error or if utilized devices have any problems or not.

Then, particularly LVDS cable on the chassis should be checked for any disconnections, loose parts, dislocations, breaks or ruptures. Likewise, it will be proper to check cable connections of the panel.

Later, the panel power supply (PANEL-VCC), which is transferred to T-CON board through LVDS cable, should be checked on L609 for 100Hz products and on T607 MOSFET Leg 3 for other products. Panel supply for the products with TF chassis is 12V.

If this value of power supply does not exist, the root cause is detected by tracking back from this supply.

Panel power supply is switched with T607 MOSFET (except the products with 100Hz panel). Initially, the input - that is L607 coil - is checked for 12V. If not found in L607, L608 should also be checked. If you cannot detect 12V supply here as well, then the problem is on the power supply side. For the products with 100Hz, L608 coil is checked for 12V. If not, then the problem is on the power supply.

If 12V exists at the input, check the voltage on T607 FET legs. When TV is “ON”, 3.8V voltage occurs on Leg 1 of FET as to be higher than 0V, and supply voltage on Leg 2 is transferred to Leg 3. If Leg 1 does not have voltage, check "TCON_ON" signal on Leg 8 of R654 resistance. Here, if the voltage is High, it means that panel supply has not been turned on from the main integrated circuit or software. This signal remains High while the TV is going out of Stand-By and gets down to 0V, 1 seconds before the picture appears on the screen.

If the panel is supplied voltage over LVDS, it is most likely that picture information is transmitted as well. Even it is not a precise control method to be used during information flow over data lines, the measuring tool detects voltage around 1.2V DC. In this case, it is likely that panel side has an error; if possible, it can be checked by using a different panel or using the same panel with a different chassis.

Besides,you can also consider problems including that LVDS data is not being transmitted to the panel properly, wrong panel EEPROM or software error. You can solve the problem by installing correct software.
Sound but no picture, and backlight not illuminated

Even though LVDS data is printed on the screen, the picture cannot be seen because the backlight is not illuminated. First, cable connections, particularly inverter and supply cables and connectors should be checked.

24V power supply should be checked over inverter cable when TV is ON. When this power needs to be supplied to the inverter unit of the panel, the backlight will not be illuminated if there is not 24V supply. 24V and 12V supplies are switched on by POWER_SW signal coming from the main integrated circuit when TV is ON. In this case, if there is 12V output but no 24V output, then the problem rests in the power supply.

If 24V supply exists on the system; on the Leg 5 of S606 connector, a voltage over 3V DC should be transmitted to the panel. This voltage gives “switch on” command to the panel inverter. This control is provided with “BL_CTRL” and T608 and peripheral materials.

Besides, voltage level that determines brightness of panel lights through Pin 6 of connector S606 should be higher than 3V. Brightness control may vary according to the panel, however, it operates dimly around 0V and completely on around 3.3V. Brightness control is done by “BRI_ADJ” signal coming from the main integrated circuit.

When the "backlighting" tab is dimmed in the user menu, the voltage in the Pin 6 of the connector decreases slowly.

If no problem appears in the checks performed at the chassis, you should consider that the problem might be arising from panel inverter module or the lights.
No Sound

It should be checked that if other sources, cables and devices have any problems. You need to make sure that volume has not been turned down from television settings or mute button is not pressed.

 If there is not any problems, check the loudspeaker cables and loudspeakers on the chassis; fix the problem, if any.

Check if there is sound on the headphones socket. As an amplifier is used, the headphones output is obtained by amplifying EAR_OUT_R, and EAR_OUT_L signals which are sent directly by main integrated circuit through IC502. If you cannot receive audio from headphones socket, those signals are checked from R505 resistor’s pin 1 and 7. If no signal is observed, then there is a problem on the main integrated circuit. If signals are detected, you should check IC502 and peripheral components against problems, and check IC502 supply and whether MUTE is pressed on.

Besides, scart output of TV should be checked for sound. If there is no sound in scart output, power supply of the integrated circuit at position IC800 and peripheral components should be checked at IC800 input to detect AU_DAC0_L and AU_DAC0_R signals which are sent by main integrated circuit. If you cannot detect AU_DAC0_L and AU_DAC0_R signals at the IC800 input, it means no sound signal comes out of the main IC. If the scart output has sound, the problem might be arising from the sound amplifier or peripheral materials

When there is no sound, the pins 2-3 or 34-35 of sound amplifier on IC501 position or L504 is checked for 12V or 24V (Amplifier is supplied with 12V in small size products and 24V in large size products). If you cannot detect power, power supply should be checked against problems.

If the amplifier is being supplied with power, Leg 19 should be checked for 3.3V DC voltage. We should suspect about main integrated circuit if there is no 3.3V. This voltage drops down to 0V and ensures switching the amplifier off in Stand-By mode (AMP_STB signal and main integrated circuit performs the control).

Sound amplifier has I2C communication lines to communicate with the main integrated circuit. Roughly, the voltage level should be below 3.3V and variable at the Pins 23 and 24. Here, the fixed 3.3V gets lower when data is being transmitted, and thus, sound amplifier and main integrated circuit communicate. If this value is constantly 0V, short circuit possibility should be checked where I2C line is connected. Current version of the software should be installed against software problems.

Pin 25 is the reset pin of the sound amplifier. This pin should be high (3.3V) during the time when TV is on. This value might be measured from C544 condenser. If this value is low (0V), RESET_OUT signal should be checked. If this signal, which can be checked from R539 resistance, is low, you may suspect that the problem rests in software or main integrated circuit. If all these inspections don't give any results, you may suspect that amplifier integrated circuit has failure.

Updating TV Software By Using USB Memory
To update TV software by means of USB memory, we will use Target folder available in the system according to product code. Firstly, copy Target folder to USB main directory. Before starting installation, you should check script and panel files in the Target folder which will be installed.

Panel and panel_4k folders contain panel software. You may control panel code from the file in these folders. Mboot contains boot software and the next step explains how to install boot code. Ursa folder is only included in 100Hz panels and contains 100 Hz software.

There are not any critical control elements for other folders.

Shut down TV before inserting USB to TV for software update. (Disconnect the power)

Then, insert USB to TV; press any key of the keypad on TV and plug the TV.

Hold down any key of the keypad on TV until you see that code installation has started.

USB update logo will be shown on the screen during software download from USB.

If code installation has been successfully completed, TV will automatically turn on. Shut down TV to remove the USB.