17MB18 – LCD TV main board – function details, service mode, alignments and more

Many companies are using this board for their LCD TVs.  It is used with 17", 15" and 20" TFT LCD TVs

The system is a 14” to 20” TFT LCD TV solution with UOCIII Versatile Signal Processor and PW1306 Video Image
Processor chip-set on 4-layer PCB. The TV will support PAL/SECAM B/G/D/K/I/L/L’.
The other general default features of the TV are as listed below:
• 1 Full Scart input (with SVHS support)
• 1 SVHS input through standard S-Video interface.
• 1 CVBS input through standard RCA jack
• 75 ohms antenna input
• D-Sub 15 PC Input
• GERMAN + NICAM STEREO
• <3W S/B Power Consumption from mains supply
• 2x3W Speaker Output Power @16 Ohm spks; HP Output, Stereo Audio line out
• Stereo Audio line in
• Equalizer
• IR Control (RC5)
• OSD;Menu Languages ENG, FRA, GER, ITA, SPA, POR, TUR, SWE, DEN, FIN, NOR, POL, HUN, CZE, BUL, ARA, PER, RUS (subject to change and be grouped)
• Teletext
• 2H/4H Comb Filter
• White balance settings (warm/normal/cool) for TV&PC
• Full AIR&CABLE band coverage
• Auto Shut down

17MB18 Main Board consists of two major blocks. The first block is analog front-end and this block is handled by UOCIII chip that is highly multifunctional. This IC does demodulation of Video & Audio from Tuner IF, CVBS, Audio,
RGB, SVHS input selection and processing. It has an audio processor that supports equalizer or tone control, volume control, AVL, surround effect etc and supplies amplifier, headphone and CVBS & audio line outputs. It handles video
processing such as colour standard detection and demodulation, picture alignment (brightness, contrast, colour etc.). The IC also does teletext decoding with 10 pages text memory. After video processing, the processed video is applied to
PW1306 chip in RGB format.
The TV Tuner is an asymmetrical IF output type and is PLL controlled. For multistandard reception, a switchable SAW filter is used as the sound filter and it is controlled by SAW_SW output from UOC. After the SAW filter block, IF signal
is applied to UOC IF inputs (VIFIN[1,2] and SIF[1,2]).
As UOCIII can handle all the audio processing, there is no need for additional audio processor solution on the board.  UOC supports three Audio outputs. These outputs are assigned to Headphone, Speaker and Scart Audio line outputs. The
board employs TDA7056A and TDA1308 to drive speaker and headphone outputs respectively. As another dedicated output for Audio Line out from jack is not possible in UOC, this line out signal is obtained by using I2S input DAC
CS4335. UOCIII I2S output is converted to anolog signal by DAC CS4335.

As the thickness of the TV set has a limit, a horizontal mounted tuner with longer connector is used in the product. The tuning is available through the digitally controlled I2C bus (PLL). Below you will find info on the Asymmetrical Tuner in use.
General description
The tuner meets a wide range of applications. It is a combined VHF, UHF tuner suitable for CCIR systems B/G, H, L, L’, I and I’. The low IF output impedance drives a wide variety of SAW filters with sufficient suppression of triple transient.
Features
Small sized UHF/VHF tuners
Systems CCIR: B/G, H, L, L’, I and I’; OIRT: D/K
Digitally controlled (PLL) tuning via I2C-bus
Off-air channels, S-cable channels and Hyper band
ZS(AE) Aerial source impedance (unbalanced) 75 Ohm

SAW Filters
K3953M is an IF Filter for Video Applications. The package is SIP5K. Supported standards are B/G, D/K, I,L/L’.
K9656M is an IF Filter for Audio Applications. The package is SIP5K. Supported standards are B/G, D/K, I, L/L’.

Back End

The Back End section is handled by PW1306 chip. This IC has built in ADC’s for RGB and SOY support. The RGB input can handle standard interlaced RGB output from UOC, PC VGA RGB input. As only 1 set of ADC is present in PW1306 these sources should be multiplexed.  All the multiplexing operations are controlled by PW1306 via YUV_TV_SW (58) and VGA_TV_SW (57) signals.

The video output from PW1306 is a 48-bit digital RGB bus format and made available on two separate connectors with TTL control signals (i.e. HS, VS, CLK, etc.). This digital output is intended to interface to TTL compatible display
devices. As PW1306 does not have integrated LVDS transmitter, 24 bit (even part of RGB) video output and TTL control signals from PW1306 are also inputted to DS90C385 LVDS IC to produce single pixel LVDS output for LVDS
compatible LCDs.  Backlight control is also possible via PW1306 Porta7 pin (PWMOUT, PL176-10), that is a variable duty-cycle pulse generator output.

Power
Several linear regulators and switches are used to generate several separate analog and digital voltage supplies such as +5, +3.3, +1.8, etc.

UOCIII
The UOCIII series combines the functions of a Video Signal Processor (VSP) together with a FLASH embedded TEXT/Control/Graphics m-Controller (TCG m-Controller) and US Closed Caption decoder. In addition the following functions
can be added:
• Adaptive digital (4H/2H) PAL/NTSC combfilter
• Teletext decoder with 10 page text memory
• Multi-standard stereo decoder
• BTSC stereo decoder
• Digital sound processing circuit
• Digital video processing circuit
The UOC III series consists of the following 3 basic concepts
• Stereo versions. These versions contain the TV processor with a stereo audio selector, the TCG m-Controller, the multistandard stereo or BTSC decoder, the digital sound processing circuit and the digital video processing circuit. Options are the adaptive digital PAL/NTSC comb filter and a teletext decoder with 10 page text memory.
• AV stereo versions. These versions contain the TV processor with stereo audio selector and the TCG m-Controller. Options are the digital sound processing circuit, the digital video processing circuit, the adaptive digital PAL/NTSC comb filter and a teletext decoder with a 10 page text memory.
• Mono sound versions. These versions contain the TV processor with a selector for mono audio signals and the TCG mController. Options are the adaptive digital PAL/NTSC combfilter and a teletext decoder with 10 page text memory.

PW1306
The PW1306 Video Image Processor is a “system-on-a-chip ” that oversamples and processes RGB or YPbPr video from analog video decoders. The PW1306 integrates video processing, including deinterlacer and video enhancement filters with a triple ADC. Analog RGB or YPbPr in PC graphics, standard, or high-definition video can be displayed in either 4:3 or 16:9 formats.
• Supports analog video decoders with triple 8-bit Analog-to-Digital Converters (ADCs) up to 140 MSPS conversion rate
• Supports Sync-on-Green (SOG), Sync-on-Luma (SOY),and Composite sync inputs
• 1080i/720p/480p HDTV; 480i and 576i NTSC/PAL SDTV; PC graphics (up to SXGA)
• YPbPr/YCbCr/YUV-to-RGB Color Space Converter with programmable coefficients
• On-chip, bitmap-based, OSD controller with on-chip memory
• 24/30/48-bit RGB output with 135 MPixels/second maximum output rate.

M29W800AT

Low Voltage Single Supply Flash Memory to store PW1306 code.
ELECTRONIC SIGNATURE
– Manufacturer Code: 20h
– Top Device Code, M29W800AT: D7h

DS90C385
The DS90C385 transmitter converts 28 bits of LVCMOS/ LVTTL data into four LVDS (Low Voltage Differential Signaling) data streams. A phase-locked transmit clock is transmitted in parallel with the data streams over a fifth LVDS link. Every cycle of the transmit clock 28 bits of input data are sampled and transmitted. At a transmit clock frequency of 85 MHz, 24 bits of RGB data and 3 bits of LCD timing and control data (FPLINE, FPFRAME, DRDY) are transmitted at a rate of 595 Mbps per LVDS data channel. Using a 85 MHz clock, the data throughput is 297.5 Mbytes/sec.
• 20 to 85 MHz shift clock support
• Tx power consumption <130 mW (typ) @85MHz Grayscale
• Supports VGA, SVGA, XGA and Dual Pixel SXGA.
• Up to 2.38 Gbps throughput
• Up to 297.5 Megabytes/sec bandwidth
• PLL requires no external components
• Compatible with TIA/EIA-644 LVDS standard.

P15V330
The PI5V330 is a true bidirectional Quad 2-channel multiplexer/demultiplexer that is for both RGB and composite video
switching applications.
• 200 MHz bandwidth
• 3 Ohm on-resistance
• Switching at 10 ns
• 100 mA output current

74HC4052

The 74HC/HCT4052 are dual 4-channel analog multiplexers/demultiplexers with common select logic. Each multiplexer has four independent inputs/outputs (nY0 to nY3) and a common input/output (nZ). The common channel select logics include two digital select inputs (S0 and S1) and an active LOW enable input (E).
• Wide analog input voltage range: ± 5 V.
• Low “ON” resistance.

80 Ohm (typ.) at VCC - VEE = 4.5 V
70 Ohm (typ.) at VCC - VEE = 6.0 V
60 Ohm (typ.) at VCC - VEE = 9.0 V

TA1366FG
TA1366FG is an Analog Y Cb Cr picture signal improver in a 24-pin SSOP plastic package. TA1366FG functions are controlled via I2C bus.
• YCbCr 2inputs
• Through mode (Y bandwidth: 0dB@30MHz)
• Y block
• Sharpness
• SRT (LTI)
• Y Group Delay Correction (Shoot balance)
• Color Detail Enhancer (CDE) and Noise Detection
• Cb/Cr block
• Color SRT (CTI)
• Green Stretcher.

TDA7056A
The TDA7056A is a mono BTL output amplifier with DCvolume control. It is designed for use in TV and monitors.
Mute mode, No switch-on and off clicks,
Thermal protection,
Short-circuit proof,
ESD protected on all pins.

TDA1308

The TDA1308 is an integrated class AB stereo headphone driver contained in an SO8, DIP8 or a TSSOP8 plastic package.
• Wide temperature range
• No switch on/off clicks
• Low power consumption
• Short-circuit resistant

LM1117
The LM1117 is a series of low dropout voltage regulators with a dropout of 1.2V at 800mA of load current. The output voltage can be adjusted..
• Available in 1.8V, 2.5V, 2.85V, 3.3V, 5V, and Adjustable Versions
• Current Limiting and Thermal Protection
• Output Current 800mA
• Line Regulation 0.2% (Max)
• Load Regulation 0.4% (Max)
• Temperature Range
• LM1117 0°C to 125°C
• LM1117I -40°C to 125°C

24LC32
24LC32 is a 4K x 8 (32Kbit) Serial Electrically Erasable PROM capable of operation across a broad voltage range (2.5V to 6.0V).

24LC21
24LC21 is a 128 x 8 bit Electrically Erasable PROM. This device is designed for use in applications requiring storage and serial transmission of configuration and control information.

74LVC541
The 74LVC541A is an octal non-inverting buffer/line driver with 5 V tolerant inputs/outputs. The 3-state outputs are controlled by the output enable inputs OE1and OE2.
5 V tolerant inputs/outputs; for interfacing with 5 V logic
Wide supply voltage range from 2.7 to 3.6 V
CMOS low-power consumption
Direct interface with TTL levels

SAA3010T
The SAA3010 is intended as a general purpose (RC-5) infrared remote control system for use where a low voltage supply and a large debounce time are expected. The device can generate 2048 different commands and utilizes a keyboard with a single pole switch for each key. The commands are arranged so that 32 systems can be addressed, each system containing 64 different commands. The circuit response to legal (one key pressed at a time) and illegal (more than one key pressed at a time) keyboard operation is specified in the section “Keyboard operation”.
Low voltage requirement
Biphase transmission technique
Single pin oscillator
Test mode facility

(I): Input,
(IPU): input with p-channel pull-up transistor,
(ODN): output with open drain n-channel transistor
(OD3): output 3-state

MC34167
The MC34167, MC33167 series are high performance fixed frequency power switching regulators that contain the primary functions required for dc–to–dc converters. This series was specifically designed to be incorporated in step–
down and voltage–inverting configurations with a minimum number of external components and can also be used cost effectively in step–up applications.  These devices consist of an internal temperature compensated reference, fixed frequency oscillator with on–chip timing components, latching pulse width modulator for single pulse metering, high gain error amplifier, and a high current output switch.
Protective features consist of cycle–by–cycle current limiting, under voltage lockout, and thermal shutdown. Also included is a low power standby mode that reduces power supply current to 36 mA.
• Output Switch Current in Excess of 5.0 A
• Fixed Frequency Oscillator (72 kHz) with On–Chip Timing
• Provides 5.05 V Output without External Resistor Divider
• Precision 2% Reference
• 0% to 95% Output Duty Cycle
• Cycle–by–Cycle Current Limiting
• Under voltage Lockout with Hysteresis
• Internal Thermal Shutdown
• Operation from 7.5 V to 40 V
• Standby Mode Reduces Power Supply Current to 36 mA
• Economical 5–Lead TO–220 Package with Two Optional Leadforms
• Also Available in Surface Mount D 2 PAK Package
• Moisture Sensitivity Level (MSL) Equals 1

TFMS5360
The TFMS5360 is a miniature receiver for infrared remote control systems.
• Photo detector and preamplifier in one.
• 36 KHZ
• Pin diode and preamp
• IR filter

UOCIII Service Menu
Turn on the TV.
Press “Menu” (M) and “4” ”7” “2” “5” buttons of RC respectively. The following menu will displayed on the screen.

GTV 3.2.1
000 EurAsia TVSub 05.01
00000000 00111100
01000000 01100100
11000101 01100100
00000000 01100100

Enter register index number directly from RC or use P/CH + and P/CH – buttons in order to go any register setting.
Press Volume + and Volume - buttons of RC in order to change the register value
Press “TV” button from RC in order to turn the UOC service menu off.

Tuner AGC Alignment
In this part, tuner AGC alignment procedure is described.
A TV pattern generator with RF output and volt-meter are needed for this alignment.
Test Set-up
“NICAM Stereo” and 60 dB PAL B/G RF signal from pattern generator will be applied.
Frequency must be set to 224.25 MHz.
• Turn on the TV and measure the AGC voltage from Tuner Pin1 without plugging in any RF input (Around 4.12V).
• Apply “NICAM Stereo” and 60 dB(1 mV) PAL B/G RF signal to the tuner input.
• Enter UOC service menu (as described above), and go to “AGC Take over” setting by pressing “1” “1” “8”.
• Measure AGC voltage from Tuner Pin1. By pressing Volume +/-; adjust AGC voltage so that the measured value at this step should be 0,5V less than the value measured at first step (Around 3.5V).
DCXO Alignment
If this alignment has not properly been done, some front end RF problems can be observed such as Nicam stereo / mono sound switching, low RF reception and color separation performance.
Test Set-up.  This alignment will be performed just after Tuner AGC Alignment. Apply “NICAM Stereo” and 60 dB PAL B/G RF signal from pattern generator. Frequency must be set to 224.25 MHz.
• Turn on the TV.
• Enter UOC service menu (as described above), and go to “DCXO Auto” setting.
• Set “DCXO Auto” value to “1” by pressing “Volume +”.
• TV will automatically align the DCXO (Digital Controlled Xtal Oscillator) value.
• Then TV automatically re-sets “DCXO Auto” value to “0”. This indicates that DCXO Alignment successfully completed.

PW1306 Service Menu
In order to work with PW service menu:
Press “Menu” (M) and “4” ”7” “2” “6” buttons of RC respectively.
Make the desired settings.
Press “Menu” (M) from RC to turn off the PW Service menu.

It is possible to move by using “UP”, “DOWN”, “LEFT” and “RIGHT” RC buttons in this menu structure.

UOC Horizontal Position
Press “DOWN” RC button at “Service Submenu 1” to highlight “UOC Hposition”
Set the proper value to fit the applied pattern to screen by using “LEFT” and ”RIGHT” buttons.

UOC Calibration
Apply 11 Vertical bar Grey-scale pattern with black on the left and white on the right side of the picture(as seen below) from CVBS input.
Press RC “AV” button, and switch to CVBS input and observe the pattern applied.
Enter to PW1306 service menu.
Press RC “DOWN” button at “Service Submenu 1” and highlight “UOC Calibration”.
Press RC “RIGHT” button to start calibration.

PW1306 PC Input ADC Calibration
Connect your TV with your PC and press RC “PC” button and observe the image.
Press “M” to display Menu and select “Options” by using right button of RC.
Press “Down” button of the RC and activate “auto adjustment”.
Press right button of the RC to perform “auto adjustment” and press “M” to exit from Menu.
Apply black on the left, white on the right(as seen below) XGA@60Hz (1024x768) pattern from PC.
Enter PW1306 service menu as described above.
Press RC “DOWN” button at “Service Submenu 1” and highlight “ADC Calibration”.
Press RC “RIGHT” button to start calibration.

NVM initialization

Press RC “RIGHT” button at “Service Submenu 1” and switch to “Service Submenu 2”
Press RC “DOWN” button and highlight “”Init NVM”

Press RC “RIGHT” button to set TV to initial settings. Next time TV is turned on, default settings will be loaded to TV

Initial APS

Press RC “RIGHT” button at “Service Submenu 1” and switch to “Service Submenu 2”
• Press RC “DOWN” button and highlight “”Initial APS”

Press RC “RIGHT” and “LEFT” buttons to set Initial APS to “on” or “off”.(When Initial APS is
to “on” TV will display “Initial APS” menu at first time it is turned ON.

Country
• Press RC “RIGHT” button at “Service Submenu 1” and switch to “Service Submenu 2”
• Press RC “RIGHT” button at “Service Submenu 2” and switch to “Service Submenu 3”Press RC “DOWN” button and highlight ”Country”
• Press RC “RIGHT” and “LEFT” buttons to set the desired country option.

Panel Type Change Shortcut
As 17MB18 software supports from 14” to 20” panel types, it is possible not to see anything on the fault panel type is 15” in the software. That s why, a hidden menu is needed to change supported panel from a hidden menu which is not shown on the screen.

In order to work with PW panel type selection shortcut service menu.

Press “Menu” (M) and “4” ”7” “2” “7” buttons of RC respectively. (Caution! No visual menu appear on the screen)

Press individual panel type selection digit to select the panel.

Turn off the TV from RC.

When the TV turns on again, it will come with new panel settings.

0 > 15” Samsung

1 > 20” CMO

2 > 17” LG

SETTINGS AND FACTORY DEFAULTS

Creating Master EEPROM

• Load the new SW version to the TV.
• Place empty EEPROM to IC101 position of the mainboard.
• Turn on the TV.SW will automatically assign the initial values to the EEPROM.
• Adjust the settings of Service Menu and User Menu.
• This EEPROM can be used as Master EEPROM.

Creating Mass Production EEPROM
• The Master EEPROM prepared like above is copied and multiplied to use in mass production.
• The copy EEPROM is placed on IC 101 of 17MB18. (When TV is turned on the software will realise that EEPROM is not empty, so SW will not change the values in the EEPROM.)

Brightness and contrast values will be left unchanged after the UOC Calibration.
xx Tint value is determined automatically by software and is active in only NTSC channels. So there is no need to adjust any value in this section.