Attention: This service manual is only for service personnel to take reference with. Before servicing please read the following points carefully. Safety precautions 1. Instructions Be sure to switch off the power supply before replacing or welding any components or inserting/plugging in connection wire Anti static measures to be taken (throughout the entire production process!): a) Do not touch here and there by hand at will;...
Page 4
2.11 Special care must be taken in transporting or handling it. Exquisite shock vibration may lead to breakage of screen glass or damage to driving circuit. Therefore it must be packed in a strong case before the transportation or handling. 2.12 For the storage make sure to put it in a place where the environment can be controlled so as to prevent the temperature and humidity from exceeding the limits as specified in the manual.
2. Alignment instructions (1) Test equipment VG-859 (YPbPr, VGA, HDMI signal generator) FLUKE 54200(TV signal generator) CA210 (white balancer) (2) Power test Connect main board, power board and IR board according the wiring diagram, connect the power and press power key (Remote controller or Keypad) button to turn on the TV. a) Test the pin voltage of P802/power board , the data is shown in table1: Table1 voltage data of P802 For 55”...
Page 6
(3) Alignment flow-chart The alignment flow-chart is shown as fig-1 Check if DDC, HDCP KEY, FLASH are written Combined test for general assembly White balance adjustment Connect to the center signal source and check each Function of TV (station leaking, analog control, etc.) Check the output of speaker.
Page 7
(4) Adjustment instruction At any input source then press the “←”, “EXIT” and “OK” (Remote control) to enter factory mode During Factory menu, if “MENU” key is pushed, system will exit factory mode. (5) Items of Factory menu When in any inputs then press the “Left -> Exit -> OK” key of remote control to enter factory mode.. During Factory menu, if “MENU”...
Page 8
Notice: After this item is processed then the DUT needs to be powered off then AC powered off. Full power (For factory test only) This is for power consumption testing. To measure the maximum power consumption of TV set, we adjust the value of following items to maximum.
3. Working principle analysis of the unit 1. NTSC signals flow: Antenna signal will be send to tuner ENV56U05D8F, t h e n T u n e r w i l l b e demodulating and output standard video signal TV-CVBS, and sound SIF signal. TV-CVBS will send to the master control IC ZR39748 to video decode, de-interlace and scaler, then output LVDS level drive for panel display.
IC block diagram 1. Zoran ZR748 • Integrated Digital & Analog Demodulator • 8VSB/QAM-B • NTSC/BTSC/A2K • Video Inputs • Three (3) 1080p HDMI (v1.4a/DC)* • One (1) 1080p YPbPr • One (1) VGA, up to WUXGA resolution • Two (2) CVBS*, One (1) S-Video •...
Page 15
• 64MByte typical for most designs • Power • 1.1V core voltage, 1.8V memory I/F, 3.3V I/O • Two Package Options • 365-ball BGA, 23x23mm • 256-pin LQFP with e-pad, 28x28mm (*) Slight variation of support with QFP package 1.1. SupraHD 748 IC Description ®...
Page 16
• Royalty-free Zoran True Fonts for OSD and closed-captioning • Transport, video decode (single MP@HL), audio decode (AC-3, MPEG Layer I & II), graphics, and display drivers • Drivers for tuner, HDMI and analog inputs • ThreadX royalty-free RTOS 1.2.2. Video Processing •...
Page 17
• Vertical scaler - 5-tap FIR, 64-phase FIR - Programmable up scaler [64x] - Programmable down scaler [1/32x] 1.2.3. Video Input • Integrated HDMI link and PHY • Three physical ports (BGA package) - One physical port (QFP package) • Single instance of the PHY •...
Page 18
• Standard definition (SD) video inputs • Two (2) CVBS inputs (BGA package) - One (1) CVBS input (QFP package) • One (1) S-Video input • No low-pass filter (LPF) required on SD inputs 1.2.4. Video Output • Gradient recovery •...
Page 19
- 82dB dynamic range and -75dB THD A/D conversion - Supported audio sampling rates from 32 to 96 KHz • Up to six (6) channels of audio output, on DDX or I2S lines • Two (2) DDX differential speaker outputs for direct power-stage drive (channels 0-1) - Or four (4) single-ended DDX for analog output (channels 0-3) - Or one (1) stereo I2S output (channels 0-1) I2S data aligned in I2S format;...
Page 20
1.2.6. Video Decoders • MPEG MP@HL decoder • Decode of a single HD (MP@HL) stream • Decodes of ISO-13818-2 MP@ML, MP@HL • Decode of all ATSC-compliant formats • Slice-level and frame-level error concealment • The decoder engine can decode MPEG-compressed bitstreams as defined in the following specifications: - ISO/IEC 13818-2, “Information Technology - Generic Coding of Moving Pictures and Associated Audio Information: Video,”...
Page 21
1.2.7. Front-End Demod / Demux • Integrated 8VSB/QAM-B demodulator • ATSC 8-VSB demodulation - Enhanced 8-VSB multi-path performance with wide equalizer coverage - Superior VSB indoor reception using enhanced equalization and synchronization algorithms, enabling Brazil and other 0 dB ghost reception - Adaptive control loops dependent upon channel conditions for fast channel acquisition and optimal tracking - Advanced doppler ghost rejection...
Page 22
• Excellent (110%) over modulation at all white signal (100IRE) • Digital video IF AGC and optional delayed tuner AGC with programmable take over point • AM interference rejection B TSC/A2 demodulator • • BTSC mono, stereo and SAP DBX decoding for US NTSC TV reception •...
Page 23
• IRR input • General-purpose 8-bit ADC with 5 multiplexed inputs • i.e. Voltage monitoring • Sleep timer • Watchdog timer • GPIO interrupt control • Support for A/V input monitoring • Monitors the HDMI inputs for activity • Integrated EDID memory for HDMI inputs and VGA inputs •...
Page 24
• Two (2) PWM outputs • Three (3) 2-signal UARTs • Maximum baud rate: 115200 • 16550 compatible • Third UART is allocated to TVuC and shared with main CPU UART • Two (2) I2C master or slave interfaces • Maximum bitrate: 400 Kb/s •...
Page 25
2. Zoran ZR39200 ZR39200 Basic SupraFRC™ IC Block Diagram Dual LVDS Input Input Multiplexer Digital Input DDR2 Interface (333MHz) Color Space Converter (RGB → YUV) Cadece Detector Frame Rate Converter & Film Dejudder Quad LVDS Output Color Managenment Sound Delay Controller GPIO Clock Generator...
Page 26
3. TEXAS INSTRUMENTS TAS5707L 20-W STEREO DIGITAL AUDIO POWER AMPLIFIER...
6. SSE55T 55-inch Wiring Diagram Wiring Connection Main board to Panel Main board to Panel Main board to Speaker SSE55T SSE55T SSE55T DC02L00440I DC02L00430I DC02V03770I 755 mm 920 mm L: 410 & R: 1200mm Panel side Main board CN5 Panel side Main board CN1 Main board CN3 Speaker...
Page 30
Power/B to Main board Power/B to Panel Inverter/B(LG panel) SSE55T SSE55T SSE55T DC02P00780I (for LG panel) DC02P00760I(for LG panel) DC02P01670I 410 mm 680 mm 760 mm Power/B P802 Main board CN2 Power/B P803 Panel BL Power/B P804 Panel BL A2008H00-16P Color A2001H02-16P A2008H00-14P...
Page 31
Power/B to Panel Inverter/B(AUO panel) SSE55T SSE55T DC02P00710I (for AUO panel) DC02P00720I (for AUO panel) 410 mm 680 mm Power/B P803 Panel BL Power/B P804 Panel BL A2008H00-14P Color A2001H02-14P A2008H00-14P Color A2001H02-14P 1 24Vcc Black 1 24Vcc 1 24Vcc Black 1 24Vcc 2 24Vcc...
7. Trouble shooting 1. Fault clearance Before calling your dealer or service center for assistance, check the matters below once again. (1) Make sure you have connected LCD TV to your equipment as described in the section “ CONNECTING LCD TV”. (2) Check cable connection.
2. Troubleshooting guide The flow chart shown below will help you to troubleshoot your Televison set with it doesn’t display normally. Each procedure offers a simple way to check for system errors. Before starting, ensure that there is a signal in and that the Televison is turned on. 2-1 Power LED no light Power LED no Light...
Page 34
2-2 Has audio but no video out Check P803 Pin1~5 Change to new power board. P/N: FSP300-4F04 (PK101V2560I) Has video but no audio out step 1...
Page 35
Has video but no audio out step 2 Change to new power board. Check P/N: FSP300-4F04 (PK101V2560I) R831 Vcc+24V...
Page 43
Add several part as mark for reserve CVBS and 2nd Y/Pb/Pr direct connection AV2_Y_IN AV2_PB_IN Video IN I/F Video IN I/F CVBS1 CVBS1 47nF/16V/0402 47nF/16V/0402 AFE_SVIDEO_Y C496 C496 47nF/16V/0402 47nF/16V/0402 AFE_SVIDEO_C 22pF/50V/0402 22pF/50V/0402 47nF/16V/0402 47nF/16V/0402 AFE_CVBS1 AFE_CVBS2 C232 1nF/50V/0402 C232 1nF/50V/0402 47nF/16V/0402 47nF/16V/0402 AV1_PR_IN...