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Summary of Contents for XOCECO LC-40T7
- Page 1 LCD TELEVISION LC-40T7...
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Page 2: Table Of Contents
CONTENTS Safety precautions………………………………………………………………………..… Alignment instructions …………………………….…….…………………………….… Working principle analysis of the unit……………………………….………….…………. Block diagram…………………………………..………………………………….………… IC block diagram………………………………………………………………………..…… Wiring diagram ……………………………………………………………………………..… Troubleshooting…………………………………………………………………………..…… Schematic diagram …………………………………………………………………….….. APPENDIX: Exploded View... -
Page 3: Safety Precautions
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 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 would be unable to work and no way to get it repaired. 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.
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Page 5: Alignment Instructions
Alignment instructions 1. Test equipment Digital multimeter, signal generator (54200) PC set (FLASH writing programs and W24CXX.EXE have to be installed first,) VG849 (HDMI signal generator) CA210 (White balancer), DVD player(with HDMI output), monitor 2. The alignment flow chart (see below Fig.1) Write N105, N403, N607, N70, N606 To produce main board, TV board and other board Check the TV board... - Page 6 3. Alignment instructions 3.1 flash write programs Flash write N606, N607, N105, N403, N701 Flash write W24CXX.EXE into N102 with self-made flash write tool on the line. Note: N606 may upgrade from the socket X1 N701 may upgrade from the serial wire N102, N403 may upgrade from HDMI and VGA interface respectively N105 can not upgrade on the line, so ensure HDCP KEY is right 3.2 the main board adjustment...
- Page 7 4 Performance check 4.1 TV terminal Input the center signal source to RF terminal, enter searching menu → auto search, check if the leak channel, half-auto search channel, fine tune, earphone and speaker are normal. Check stereo/SAP/CCD/ Parent Control for America unit. Check the AV OUT. 4.2 AV1/S/AV2 input terminals Input AV1/S/AV2 signal source, check the picture, sound and the output of AV-OUT.
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Page 8: Working Principle Analysis Of The Unit
4.5 HDMI terminal Input the DHMI signal source (VG849 signal generator), separate input format signal of table 3, check the picture and sound. Table 3 HDMI format signal H-frequency(kHz) V-frequency(Hz) signal 15.735 SDTV 480i 15.625 SDTV 576i 31.47 SDTV 483p 45.00 HDTV 720p 33.75... - Page 9 Image parts: Video signal of TUNER will be sent to AV switch M52797 (N400), Video signal of AV1 and AV2 will also be sent to M52797 (N400) at the same time, two groups of video output will be obtained after switching, one group of video output together with its audio output will be sent to AV_OUT terminal to treat as AV OUT.
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Page 10: Block Diagram
Block diagram... -
Page 11: Ic Block Diagram
IC block diagram 1. AD9880 and AD9398 AD9880 have HDMI digital and analog terminal of working frequency 165Hz, it support 1080P (non-interlaced scanning) and UXGA (1600 x 1200/60Hz) video format, also it support eight audio channel of 192KHz. AD9398 without analog terminal. Internal Block Diagram... - Page 12 PIN configuration AD9880 (AD9398) PINS FUNCTIONS Name Function Pin Name Function GGE(0-7) Converter output RXC+ DVI input 12-19 GBE(0-7) Converter output DDC_CLK HDCP Slave Serial Port Data Clock 92-99 GRE(0-7) Converter output DDC_DATA HDCP Slave Serial Port Data 20, 21 MCLK Control clock output HDCP Master Serial Port Data Clock...
- Page 13 I2S_SD Bus audio data output SDA_1 Serial Port Data I/O RX0- DVI input G_FIEL0 Odd/Even Field Output RX0+ DVI input G_VS VSYNC Output Clock RX1- DVI input G_VHS Sync Green Slicer Output RX1+ DVI input G_HS HSYNC Output Clock RX2- DVI input G_DE Data Enable...
- Page 14 VGA-B1 VGA(blue) GVBI Vertical blanking blank VGA_H VGA(H-sync signal) GFIELD VGA_V VGA(V-sync signal) G_VS V-SYNC output AV1 red input G_HS H-SYNC output AV1 greed input G_AHS H-SYNC of non-processing SOG_1 AV1 greed sync input G_DE AV1 blue input G_DLK Clock output GBO(2-9) Blue odd pixel data output GBE(0-7)
- Page 15 PINS FUNCTION Name Function Name Function SHUTDOWN Shut down control signal LOUTN Negative audio output for left channel RINP Positive audio input for right channel LOUTP Positive audio output for left channel V2P5 2.5V Reference for analog cells. ROSC I/O current setting resistor for ramp generator.
- Page 16 Pin description Name Description Name Description HD2_L Audio input HD2_R Audio input AV1_L Audio input AV1_R Audio input AV2_L Audio input AV2_R Audio input TV_L Audio input TV_R Audio input Left audio channel output Right audio channel output...
- Page 17 6.CM2006 It includes ESD protection, level-shifting, buffering and sync impedance matching Internal Block Diagram Pin description Name Description Name Description 3.3V DDC_IN2 DDC _input2 3, 4, 5 VIDEO_1_2_3 Video input DDC_OUT2 DDC output SYNC_IN1 Sync input1 Vcc-DDC 5V DDC SYNC_OUT1 Sync output1 Bypass capacitance SYNC_IN2...
- Page 18 Pin description Description Description SIF IN AVOUT_R I2C_CL AV OUT_L I2C_DA SC1_IN_L OUT_R SC1_IN_R OUT_L VEEFTOP MONO_IN...
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Page 19: Wiring Diagram
Wiring diagram... -
Page 20: Troubleshooting
Trouble shooting 1. Fault clearance Before servicing please check to find the possible causes of the troubles according to the table below. 1.1 Antenna (signal): Bad status in signal receiving Picture is out of focus or jumping Poor signal Check if there are failures with the electrical connector or the antenna. - Page 21 signal types. Picture too bright and there is Check if the contrast setting is too high. distortion in the brightest area Possibly the output quality of DVD broadcaster is set too high. It maybe also due to improper terminal connection of the video frequency signal in a certain position of the system.
- Page 22 2. Identification criteria for the bright spot and dark spot of the LCD screen Quantity allowed Distance between two spots Category Criteria 15" 20" 22" 30" 40" 15" 20" 22" 30" 40" One single ≤5 ≤2 ≤5 ≤2 ≤3 spot Bright ≥15mm spot...
- Page 23 3. Troubleshooting guide 3.1 No raster, no picture and no sound Check if the indicator is light Check supply Check 5V-STBY power +3.3V Abnormal Normal Cut off connection between the power board and signal processing Short circuit the pin 1 (STANDBY) Check N501 and board, check the 5V-STBY of X604 to 5V, then check the...
- Page 24 2.With sound but no picture: With sound but no picture Display LOGO? Check if no image for all other channels Check signal wave of X3, X4 Check the N201 Refer and peripheral checking procedure circuit Unfix X3 and X4, turn on the unit and check if display the white screen Normal Abnormal...
- Page 25 3.With picture but no sound. With picture but no sound If there is output from X700 of sound power amplification board Check if input signal in pin 3,5 of Sound box damaged sound power amplification Sound power amp. or other peripheral circuit Measure if the sound input of the have problem.
- Page 26 5. Troubleshooting guide of power supply board No Backlight Check whether X506 (PIN1) of Check main board power supply board is 120V Check whether IC Check whether C527 is 16V? N508 is damaged? Check whether pin7 and pin3 of X505 in power board are 18V and Check whether C511 is 18V? Check whether...
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Page 27: Schematic Diagram
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- Page 36 42" Power board...
- Page 37 603-L40T70-10 Ver.1.0...
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