XOCECO LC-42R27 Service Manual Download | Manualshive

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23

3. Troubleshooting guide

1. Without backlight

In STANDBY, does
LED red light

Check the pin1 and pin3 of
CN3 has +5V output

Check the
FUSE

Replace supply
power board

Check the LED

Replace CPU board

Does LED flicker

Replace CPU
board

Check the
backlight socket is
normal?

Problem LCD screen

Check if the X508
(pin1-2) of the power
board has 18V,
pin10-12 has 120V.

Is 5v for pin10 of
X20 ?

Check if between R172
and R173 connect wire
has 3.3V, if R178 short
to the guand?

Replace CPU board

Check the pin B and pin
C of V10 and V12 is
normal?

Yes

No

No

Yes

Yes

No

Yes

Yes

No

No

No

Yes

Green

Yes

No change color

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Summary of Contents for LC-42R27

Page 1: ...LCD TELEVISION LC 42 47R27 ...

Page 2: ...utions Alignment instructions Working principle analysis of the unit Block diagram IC block diagram Wiring diagram Troubleshooting Schematic diagram APPENDIX A Main assembly list APPENDIX B Exploded view 1 2 6 7 8 19 20 26 ...

Page 3: ... will result 2 5 If any foreign substance such as water liquid metal slices or other matters happens to fall into the module be sure to cut the power off immediately and do not move anything on the module lest it should cause fire or electric shock due to contact with the high voltage or short circuit 2 6 Should there be smoke abnormal smell or sound from the module please shut the power off at on...

Page 4: ... shadow The extent of the residual picture varies with the maker of LCD screen This phenomenon doesn t represent failure This ghost shadow may remain in the picture for a period of time several minutes But when operating it please avoid displaying still picture in high brightness for a long time 3 Points for attention during installation 3 1 The front panel of LCD screen is of glass When installin...

Page 5: ...n skipping modulate quantity control etc check if the output of earphone and speaker are normal Combined test for general assembly Input AV S signal and HDTV signal check various functions under AV S terminal Check accessories and then packing Input VGA signal and check if display is normal in the state of PC and various functions analog quantity control line field center etc Check DDC HDCP KEY an...

Page 6: ...p Adjust R OFFSET G OFFSET and B OFFSET item still the third step and the seventh step color coordinate to 285 293 Adjust R GAIN G GAIN and B GAIN item still the seventh step color coordinate to 285 293 Repeat adjustment R OFFSET G OFFSET and B OFFSET item and R GAIN G GAIN and B GAIN item still two step gray to 285 293 Enter the factory menu3 cool and warm color temperature difference menu adjust...

Page 7: ...Center 128 treble 60 50 40 Factory Menu 5 27CMO 32LG 26SHARP 32SHARP Factory Menu 7 Volume_1 48 52 S2310_Color 142 Volume_25 100 102 S2310_Contrast 120 Volume_50 114 116 S2310_Bright 133 Volume_100 123 121 Bright_Cen_Delt 0 Bright_Max_Delt 2 Cont_Cen_Delt 10 Cont_Max_Delt 12 4 Performance check 4 1 TV function Input center source signal to RF TV terminal check if the channel is leak for auto searc...

Page 8: ...al then sent RGB switch N4 CBT3257C select with RGB from pc signal then it sent to GM1501 1601 The HDMI via receiver N34 MST3383MB processing after it output RGB signal of 24bit to GM1501 1601 They sent to GM1501 1601 picture processing therein YPBYP or RGB to A D conversion after it and other two signal are switched selection and digital display processing it include OSD GAMMA correction brightne...

Page 9: ...UV_SW YUV VGA L R_PIP SIF V_PIP Y_Main C_main YUV USB YUV_SW HP_SW PANEL INVERTER Power Supply BK Control VBL VCC EDID Power_ON 5V_STB VCC VBL Power_ON IR KeyA KeyB Led1 Led2 Mute HP_SW VGA_CAB DVI_CAB YUV VGA YUV_SW YUV USB Frame Buffer Frash ROM Video Decoder Video Decoder Deinterlacer HDMI RX AV Switch Audio Processor Audio Switch LCD TV Controller RGB Switch 24C04 24C02 yyc Ver 1 0 LC 37RXX BL...

Page 10: ...ocedures in order to achieve good stereo separation for BTSC and EIA J The MSP 34x0G has optimum stereo performance without any adjustments All MSP 34xxG versions are pin compatible to the MSP 34xxD Only minor modifications are necessary to adapt a MSP34xxD controlling software to the MSP 34xxG The MSP 34x0G further simplifies controlling software Standard selection requires a single I2C transmiss...

Page 11: ...9 Fig 1 1 Simplified functional block diagram of the MSP 34x0G ...

Page 12: ...s also available On CVBS and Y C inputs the user can control video characteristics such as hue contrast brightness and saturation via an I2C host port interface Furthermore luma peaking with programmable gain is included as well as a patented color transient improvement CTI circuit Attenuation at higher frequencies or asymmetrical color subcarrier sidebands are compensated using the IF compensatio...

Page 13: ...11 INTERNAL BLOCK DIAGRAM ...

Page 14: ...e need for external heatsinks when playing music The gain of the amplifier is controlled by two gain select pins The gain selections are 15 3 21 2 27 2 and 31 8 dB The outputs are fully protected against shorts to GND VCC and output to output shorts A fault terminal allows short circuit fault reporting and automatic recovery Thermal protection ensures that the maximum junction temperature is not e...

Page 15: ... backward compatible to DVI 1 0 and HDCP 1 0 MCU Interface The MST3383MB provides 2 wire serial bus for interfacing with an MCU It detects active inputs for both on line and off line operations During on line operation the MST3383MB also provides polarity and period count information of active input s DE signals The MCU can easily adjust the input mode and switch to active input properly Color Spa...

Page 16: ...ted onto a single device the gm1601H eliminates the need for several system components simplifying the design and reducing the cost of high end multimedia LCD monitors and televisions while maintaining a high degree of flexibility and quality The gm1601H is available in two silicon revisions BD and CF GM1601H CF is a backwards compatible addition that incorporates some functional and quality impro...

Page 17: ...nipulation matrix supports all color spaces RGB YPrPb 4 4 4 YCrCb 4 2 2 YCr Cb ITU R BT656 ITU R BT601 Output supports analog RGB YPrPb and YCrCb in the FLI230x and digital RGB YPrPb 4 4 4 YCrCb and 4 2 2 YCr Cb in FLI230x FLI2310 6 4 Frame Rate Conversion Tearless Frame Rate Conversion 50 60 72 75 100 120 Hz 6 5 Front End Processing Motion Adaptive Noise Reduction Improves picture quality for off...

Page 18: ...r luma and chroma video enhancer brings out details in the picture producing a more life like image 6 9 Memory 32 bit wide SDRAM i e one 2M x 32 bit or two 1M x 16 bit controller up to 166 MHz operation for external SDRAM INTERNAL BLOCK DIAGRAM 7 TVP5147 Functional Block Diagram ...

Page 19: ...17 8 CXA2089Q ...

Page 20: ...18 9 AML3428 The AML3428 is a highly integrated device that provides cost effective solutions in MPEG 2 and HVD systems The diagram below highlights the main components of the AML3428 ...

Page 21: ...Power board CPU board XU2 of USB USB board X23 of CPU board Analog board Connect this wire only when there have USB Speaker Wiring diagram 19 ...

Page 22: ...nd if interfered possibly by the equipment like transmitting antenna non professional radio station and cellular phone 1 2 TV set Symptoms Possible cause Unable to switch the power on Check to see if the power plug has been inserted properly into the socket No picture and sound Check to see if the power supply of liquid crystal TV has been switched on As can be indicated by the red LED at the fron...

Page 23: ... batteries are installed in the reverse order Check if the battery is effective Check the distance or angle from the monitor Check if there is any obstruct between the remote control and the TV set Check if the remote control signal receiving window is exposed to strong fluorescence No picture and sound but only hash Check if the antenna cable is correctly connected or if it has received the video...

Page 24: ...mm 10mm 5mm Total defected point 8 7 5 4 Notes 1 Definition of defected point bright spot dark spot It is identified as a defected point if its area exceeds 1 2 of a single picture element R G B 2 Definition of bright spot It is identified as a bright spot if it is bright in the state of dark field and its bright size remains unchanged 3 Definition of dark spot It is identified as a dark spot if i...

Page 25: ...oes LED flicker Replace CPU board Check the backlight socket is normal Problem LCD screen Check if the X508 pin1 2 of the power board has 18V pin10 12 has 120V Is 5v for pin10 of X20 Check if between R172 and R173 connect wire has 3 3V if R178 short to the guand Replace CPU board Check the pin B and pin C of V10 and V12 is normal Yes No No Yes Yes No Yes Yes No No No Yes Green Yes No change color ...

Page 26: ...ut signal Replacing CPU assy Replacing N34 Check the pin4 and pin8 of N24 has H V sync Check if C16 has SOG signal Check if the pin1 and pin5 of N24 has input signal Replacing N24 Check if the pin2 and pin3 of N4 has input signal Replacing N4 Check the N10 input and output Replacing CPU assy Does R70 R73 input signal Replacing N7 No Yes Yes No Yes No Yes Yes No Yes No Yes No Yes No Yes No Yes No N...

Page 27: ...n67 Is the signal output TUNA1 pin12 Replacing NA7 Replacing NA5 Replacing NA4 Check if the pin1 and pin2 of XA17 is 18V Is high level of NA9 pin1 Check if RA136 short to the ground Which is high level for DA8 DA10 DA11 Replacing TUNA1 Check the pin3 of X14 Check the speaker output 1 2 or 3 4 Check the output of V18 No No Yes Yes No No No Yes Yes Yes Yes No No No DA11 DA8 DA10 ...

Page 28: ...Graphic Component IN of CPU board 203 L37R70 01DL Page 1 of 7 ...

Page 29: ...Video decoders of CPU board 203 L37R70 01DL Page 2 of 7 ...

Page 30: ...CPU board 203 L37R70 01DL Page 3 of 7 ...

Page 31: ...Frame memory of CPU board 203 L37R70 01DL Page 4 of 7 ...

Page 32: ...GM1601 of CPU board 203 L37R70 01DL Page 5 of 7 ...

Page 33: ...Memory I F of CPU board 203 L37R70 01DL Page 6 of 7 ...

Page 34: ...Power of CPU board 203 L37R70 01DL Page 7 of 7 ...

Page 35: ...Analog board 782 L37R7 5300 Page 1 of 2 ...

Page 36: ...Analog board 782 L37R7 5300 Page 2 of 2 ...

Page 37: ......

Page 38: ......

Page 39: ......

Page 40: ......

Page 41: ......

Page 42: ...phone board 667 L42R17 10 Power supply board 667 L42K17 20A Remote control 301 D47R27 07A RC D07 0A Panel 335 42008 00 V420H1 L01 NAME NO MAIN COMPONENT AND it S NO Analog board 667 L42R27 53 NA4 NA5 NA7 MSP3420 352 34200 10 M62494FP 353 62494 20 TPA3008D2 353 30080 10 CPU board 667 L37R18 56A N15 N10 N7 N8 N34 GM1601 353 16010 20 FLI2310 353 23100 00 TVP5160 353 51600 10 TVP5147 353 51470 10 MST3...

Page 43: ...603 L42R270 10 Ver 1 0 ...

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