Tuesday, 17 November 2020

Whirlpool Microwave Oven MT244-1-BLACK – wiring diagram, schematic, error codes, exploded view

 Before leaving the factory each oven is carefully checked.  It must, however, be installed and used correctly.

Always disconnect the plug from the mains before starting work.

When you have finished servicing an oven before you reconnect it to the mains, make sure that:

- all the internal connections are correct

- the wires are insulated and not touching the door or the cabinet or anything sharp

- all the earth connections are electrically and mechanically sound

- do not modify or anyway interfere with the safety devices built-in to the oven.

Do not operate the oven if the following conditions exist:

- the door does not close firmly against the door support because of the door being warped or the hinges damaged.

- The door trims or seals are damaged.

- If there is any visible damage to the oven.

- if the door does not close properly.

Avoid operating the oven if known components in the interlock system, oven door or microwave generating assembly are known defective. They must be replaced.

Output power 950 W

Grill 900 W

Microwave frequency 2450 MHz

Error codes

Certain fault conditions are indicated by an error code.

The following codes are implemented:

ERR 0:   Convection temperature sensor fault.  Not connected or short circuit.

ERR 1:   Short circuit in the MW relay.

ERR 6:   Weight sensor calibration has not been performed.

ERR 7:   Humidity sensor is defect or has not been connected.

ERR 8:   Impossible to write to E2 PROM.

ERR 9:   Options have not been set.

ERR A:   No wheel detected on weight sensor.

ERR B:   No pulses from the weight sensor or <4267 Hz.

ERR C:   Fuzzy temperature sensor fault. Not 19-41 ˚C.

Exploded view



Schematic diagram


Printed circuit board

Wiring diagram


Monday, 16 November 2020

LG CB20T20X 20 inch color television – how to enter the service mode, service mode adjustments, circuit diagram

 

Used ICs: TDA2006, TDA8841 or TDA8842, U4488B, LA7016, CD4052B, SAA5281, CXP864P61S, 24C16, TDA8351, STR S5707, TDA6107Q, GMS30140 [remote control IC]

To enter the service mode press "OK" buttons on both TV set and the Remote control at the same time.

RF AGC (Automatic Gain Control) Adjustment

Test Point : AGC TP (J05)

Adjust : Remote Control.

The RF AGC was aligned at the time of manufacture for optimum performance over a wide range conditions.  Readjustment of RF AGC should not be necessary unless unusual local conditions exist, such as;

1) Channel interference in a CATV system.

2) Picture bending and/or color beats, which are unusually due to excessive RF signal input when the receiver is too close to a transmitting tower or when the receiver is connected to an antenna distribution system where the RF signal has been amplified. In this case, the input signal should be attenuated (with pad or filter) to a satisfactory level.

3) Picture noise caused by "broadcast noise" or weak signal.  If the broadcast is "clean" and the RF signal is at least 1mV (60dBu), the picture will be noise free in any area.

Adjusting RF AGC to one end of rotation will usually cause a relatively poor signal to noise ratio;

Adjusting to the other end of rotation will usually cause a degradation of over load capabilities resulting in color beats or adjacent channel interference.

Adjustment

1. Connect RF signal (65dB!0.2dB) and turn on the TV.

[Standard adjustment Channel]

- EU 05 Ch. (frf = 175.25MHz) : CK, CL, CB

- EU 41 Ch. (frf = 631.25MHz) : CI

2. Press OK buttons on TV set and Remote Controller at the same time to get into SVC-0 mode.

3. Press Channel UP/DOWN button on the Remote Controller several times to find AGC?

4. Press Volume UP/DOWN button until the AGC Voltage is the same as the Table below.

5. Press OK(Y) button to memorize the data.


Screen Voltage Adjustment

Test Point : RK (Red Cathode of CPT Board)

Adjust : Screen Control of FBT

1) Press TV/AV Key to get AV Mode.

2) Connect the probe of oscilloscope to the RK (Red Cathode) of CPT Board.

3) Adjust Screen Volume of FBT so that the waveform is the same as below figure.

Focus Adjustment

Test Point : Observing Display

Adjust : Focus control of FBT

1) Tune the TV set to receive an inactive channel station.

2) Adjust the Focus control of FBT for best overall focus.

Deflection Data Adjustment (Line SVC-1)

Enter the service mode as described earlier.

1. Preparation for Deflection Adjustment

1) At SVC mode, press the Yellow colored button.

If the Remote Controller doesn't have the Yellow button, you should use a Service Remote Control (105-201G) and press SVC button.

And then, deflection data adjustment OSD (SVC1 mode) will be displayed.

2) Press Channel UP/DOWN button for desired function Adjustment.

3) Press Volume UP/DOWN button to adjust the data.

2. Deflection Adjustment Procedure

1) Vertical Adjustment

Select VS and adjust until the mechanical center of CPT and that of screen coincides and select VA and adjust to coincide the inner circle of screen with outer frame of CPT

2) Horizontal Adjustment

Select HS and adjust until the mechanical center of CPT and that of screen coincides.

3) Vertical S Correction Adjustment

Select SC and adjust until top-bottom side pincushion is equal.

4) Press OK button to memorize the data.

White Balance Adjustment.(LINE SVC-0)

NOTE : This adjustment should be performed after screen voltage adjustment.

1) Tune the TV set to receive an 100% white pattern.

2) Press OK(Y) buttons on TV set and remote controller at the same time to get into SVC mode.

3) Press PSM(RED) button on remote controller. (Standard picture)

4) Press Channel UP/DOWN button for desired function adjustment.

5) Adjust VOL+ or VOL- button for GG031.

6) Adjust VOL+ or VOL-button in each status of "Rg--"/"Bg--" for X=293!8, Y=295!8 with color analyzer.

7) Press OK(Y) button to memorize the adjustment data.

OPTION Adjustment (SVC MODE:OPTION-1, OPTION-2)

NOTE: When the EEPROM has been replaced, the Option data should be restored as the function of individual system and specification.

1) Press OK buttons on both TV set and Remote Controller at the same time to get into SVC mode.

2) Press the Yellow button several times to find OPTION-1 or OPTION-2.

3) Input the correspond OPTION data referring to Table below with the numeric buttons 0~9


Exploded view

Main board

Circuit diagram [Schematic] – PC-81A chassis


Monday, 2 November 2020

Philips 43PUS6804, 50PUS6704 PAL,NTSC,SECAM TPM19.6E LA chassis – how to enter the service mode, factory mode, power board and amplifier board schematic

 

Always respect voltages. While some may not be dangerous in themselves, they can cause unexpected reactions that are best avoided. Before reaching into a powered TV set, it is best to test the high voltage insulation. It is easy to do, and is a good service precaution.

43PUS6xx3: 108cm/43inch

50PUS6xx3: 126cm/50inch

55PUS6xx3: 139cm/55inch

58PUS6xx3: 147cm/58inch

The setting Optimal* allows maximum up to Ultra HD (50Hz or 60Hz) RGB 4:4:4 or YCbCr 4:4:4/4:2:2/4:2:0 signals.

This TV can display Ultra HD signals. Some devices – connected with HDMI – do not recognize a TV with Ultra HD and might not work correctly or show distorted picture or sound.

To avoid the malfunctioning of such a device, you can set the signal quality to a level the device can handle. If the device is not using Ultra HD signals, you can switch off Ultra HD for this HDMI connection.

LNB : DiSEqC 1.0, 1 to 4 LNBs supported, Polarity selection 14/18V, Band selection 22kHz, Tone burst mode, LNB current 300mA max.

* Only for DVB-T2, DVB-S2

Mains power : AC 220-240V +/-10%

Alternative BOM identification

It should be noted that on the European Service website, “Alternative BOM” is referred to as “Design variant”.

The third digit in the serial number (example:

AG2B0335000001) indicates the number of the alternative B.O.M. (Bill Of Materials) that has been used for producing the specific TV set. In general, it is possible that the same TV model on the market is produced with e.g. two different types of displays, coming from two different suppliers. This will then result in sets which have the same CTN (Commercial Type Number; e.g. 28PW9515/12) but which have a different B.O.M. number.

By looking at the third digit of the serial number, one can identify which B.O.M. is used for the TV set he is working with. If the third digit of the serial number contains the number “1” (example: AG1B033500001), then the TV set has been manufactured according to B.O.M. number 1. If the third digit is a “2” (example: AG2B0335000001), then the set has been produced according to B.O.M. no. 2. This is important for ordering the correct spare parts.

For the third digit, the numbers 1...9 and the characters A...Z can be used, so in total: 9 plus 26= 35 different B.O.M.s can be indicated by the third digit of the serial number.

Identification: The bottom line of a type plate gives a 14-digit serial number. Digits 1 and 2 refer to the production centre (e.g. SN is Lysomice, RJ is Kobierzyce), digit 3 refers to the B.O.M. code, digit 4 refers to the Service version change code, digits 5 and 6 refer to the production year, and digits 7 and 8 refer to production week (in example below it is 2010 week 10 / 2010 week 17). The 6 last digits contain the serial number.


Service Modes

The Service Mode feature is split into following parts:

Service Alignment Mode (SAM).

Factory Mode.

Customer Service Mode (CSM).SAM and the Factory mode offer features, which can be used by the Service engineer to repair/align a TV set.

SAM and the Factory mode offer features, which can be used by the Service engineer to repair/align a TV set. Some features are:

Make alignments (e.g. White Tone), reset the error buffer(SAM and Factory Mode).

Display information (“SAM” indication in upper right corner of screen, error buffer, software version, operating hours, options and option codes, sub menus).

The CSM is a Service Mode that can be enabled by the consumer. The CSM displays diagnosis information, which the customer can forward to the dealer or call centre. In CSM mode, “CSM”, is displayed in the top right corner of the screen. The information provided in CSM and the purpose of CSM is to:

Increase the home repair hit rate.

Decrease the number of nuisance calls.

Solved customers’ problem without home visit.

Note: For the new model range, a new remote control (RC) is used with some renamed buttons. This has an impact on the activation of the Service modes.  For instance the old “MENU” button is now called “HOME” (or is indicated by a “house” icon).

Service Alignment Mode (SAM)

Operation hours counter (maximum five digits displayed).

Software version, error codes, and option settings display.

Error buffer clearing.

Option settings.

Software alignments (White Tone).

NVM Editor.

Set screen mode to full screen (all content is visible).

How to Activate SAM

To activate SAM, use one of the following methods:

Press the following key sequence on the remote control transmitter: “062596”, directly followed by the “INFO/OK” button. Do not allow the display to time out between entries while keying the sequence.

Or via ComPair.

After entering SAM, the following items are displayed, with “SAM” in the upper right corner of the screen to indicate that the television is in Service Alignment Mode.

How to Navigate

In the SAM menu, select menu items with the UP/DOWN keys on the remote control transmitter. The selected item will be indicated. When not all menu items fit on the screen, use the UP/DOWN keys to display the next/previous menu items.

With the “LEFT/RIGHT” keys, it is possible to:

– (De) activate the selected menu item.

– (De) activate the selected sub menu.

– Change the value of the selected menu item.

When you press the MENU button once while in top level SAM, the set will switch to the normal user menu (with the SAM mode still active in the background).

How to Store SAM Settings

To store the settings changed in SAM mode (except the RGB Align settings), leave the top level SAM menu by using the POWER button on the

remote control transmitter or the television set. The mentioned exceptions must be stored separately via the STORE button.

How to Exit SAM

Use one of the following methods:

Switch the set to STANDBY by pressing the mains button on the remote control transmitter or the television set.

Via a standard RC-transmitter, key in “00” sequence.

Note: When the TV is switched “off” by a power interrupt while in SAM, the TV will show up in “normal operation mode” as soon as the power is supplied again. The error buffer will not be cleared.

Remark: Under main menu “NVM editor”, select “Service Data”, you can use the UP/DOWN keys to view and change the set Type number, the set Production Number or the 18AC of a part.(The NVM-editor still has the same function as before, alpha-numeric entry.)

SAM mode overview

Factory mode:

Displaying and or changing Panel ID information.

Displaying and or changing Tuner ID information.

Error buffer clearing.

Various software alignment settings.

Testpattern displaying.


Public Broadcasting Service password Reset. etc

How to Activate the Factory mode

To activate the Factory mode, use the following method:

 Press the following key sequence on the remote control transmitter: from the “menu/home” press “1999”, directly followed by the “Back/Return” button. Do not allow the display to time out between entries while keying the sequence.

After entering the Factory mode, we can see many items displayed, use the UP/DOWN keys to display the next/previous menu items.

How to Exit the Factory mode

Select EXIT_FACTORY from the menu and press the “OK” button.

Note: When the TV is switched “off” by a power interrupt, or normal switch to “stand-by” while in the factory mode, the TV will show up in “normal operation mode” as soon as the power is supplied again. The error buffer will not be cleared.

Factory mode overview

How to Activate CSM

To activate CSM, press the following key sequence on a standard remote control transmitter: “123654” (do not allow the display to time out between entries while keying the sequence). After entering the Customer Service Mode, the following items are displayed. use the Right/Left keys to display the next/previous menu items.

Note: Activation of the CSM is only possible if there is no (user) menu on the screen.

How to Navigate

By means of the “CURSOR-DOWN/UP” knob (or the scroll wheel) on the RC-transmitter, can be navigated through the menus.

How to Exit CSM

To exit CSM, use one of the following methods.

Press the MENU/HOME button on the remote control transmitter.

Press the POWER button on the remote control transmitter.

Press the POWER button on the television set.

CSM Overview


Software Upgrading, Error code and Panel Code

The following update is for .pkg file.

1. Rename the file to “upgrade_loader.pkg”.

2. Prepare a USB memory (File format: FLAT, Size: 1G~8G).

3. Copy the software to USB flash disk (root directory).

4. Switch off the TV and Insert the USB memory stick that contains the software update files in one of the TV’s USB 2.0 port.

Note: It contains USB3.0 port, if connect on it, the software may can’t be detected.

5. Switch on the TV. The TV will detect the USB memory s tick automatically. Then a window jumps out as below:

6. When the TV software is updated, the TV will turn on again automatically. Remove your USB flash drive.

7. We can enter in CSM or Factory mode to check the current software version.

The following update is for .upg file.

Ready for F/W Upgrade

1. Rename the file to “autorun.upg”.

2. Prepare a USB memory (File format: FLAT, Size: 1G~8G).

3. Copy the software to USB flash disk (root directory).

4. Switch on the TV and Insert the USB memory stick that contains the software update files in one of the TV’s USB 2.0 port.

Note the version of this F/W before you change the software file name.

F/W Upgrade

Warning:

Do not switch off your TV or remove your USB flash drive during the software update.

If a power failure occurs during the update, do not remove your USB flash drive from your TV. Your TV will continue the update as soon as power is restored.

If an error occurs during the update, retry the procedure. If the error reoccurs, contact Philips Consumer Care.

1. Connect your USB flash drive (containing the software update) to the USB connector on the TV. Wait 30 seconds or until the USB drive is recognized by the TV.

2. Your TV will start loading the software automatically.

3. When the loading of the software finished, press “Start” to activate the upgrade of the TV.

Notes:

If the USB flash drive is not detected, disconnect it and reconnect again.

In case the software does not start loading automatically, you can also update the software manually

1. Press (Settings) on your remote control, and select All Settings > Update Software > Local Updates, and press OK.

2. Select the software file and follow the on-screen instruction to install latest software on your TV.

Check the SW version

1. After burning software, TV will restart

2. Press “123654”, enter Customer Service Mode to check if the software version is correct.

Caution: Please make sure that software upgrade is finished before unplug the USB and AC power.

Error Code

Error codes are required to indicate failures in the TV set. In principle a unique error code is available for every:

• Activated (SW) protection.

• Failing I2C device.

• General I2C error.

The last five errors, stored in the NVM, are shown in the Service menu’s. This is called the error buffer.

The error code buffer contains all errors detected since the last time the buffer was erased. The buffer is written from left to right. When an error occurs that is not yet in the error code buffer, it is displayed at the left side and all other errors shift one position to the right.

An error will be added to the buffer if this error differs from any error in the buffer. The last found error is displayed on the left.

An error with a designated error code never leads to a deadlock situation. It must always be diagnosable (e.g. error buffer via OSD or blinking LED).

In case a failure identified by an error code automatically results in other error codes (cause and effect), only the error code of the MAIN failure is displayed.

How to Read the Error Buffer

You can read the error buffer in following ways:

• On screen via the SAM/CSM (if you have a picture).

Example:

– ERROR: 000 000 000 000 000: No errors detected

– ERROR: 013 000 000 000 000: Error code 13 is the last and only detected error

– ERROR: 034 013 000 000 000: Error code 13 was detected first and error code 34 is the last detected (newest) error

• Via the blinking LED procedure (when you have no picture).

Error codes overview

In this chassis only “layer 2” error codes are available and point to problems on the SSB. They are triggered by LED blinking when CSM is activated. Only the following layer 2 errors are defined:

How to Clear the Error Buffer

The error code buffer is cleared in the following cases:

• By using the CLEAR command in the SAM menu

• By using the CLEAR command in the Factory mode:

• By using the following key sequence on the remote control transmitter: “062599” directly followed by the OK button.

• If the contents of the error buffer have not changed for 50 hours, the error buffer resets automatically.

Note: If you exit SAM by disconnecting the mains from the television set, the error buffer is not reset.

Set Option Code

Press the following key sequence on a standard RC transmitter: “062598” directly followed by MENU and “xxx”, where “xxx” is a 3 digit decimal value of the panel type: see column “Set Option Code” in below tab. After resetting the Display Code, restart the set immediately.



POWER BOARD SCHEMATIC

A 715GA018 PSU(For 50”/55” 6704 Series)


A 715GA052 PSU (For 43”50” 6504, 43” 6704&6804 Series)


AUDIO AMP SCHEMATIC


LG 32LK610BPUA, LG 32LK610BBUA LCD TVs – How to upgrade the software, fault checking method

  Software update procedure USB (1) Insert the USB memory Stick to the USB port (2) Automatically detect the SW Version and show the bel...