Service Manual
Page 6
TROUBLE SHOOTING FLOW CHART (2) TV No Sound Check or change U7,U18 Back to default setting Other Source CheckU18dcheck U26,U27 output Check Main Board and wire connecting R or L no sound all source one port all source Check Main Board dwiredU26,U27 output Check U7 Check Speaker connecting Check U7,U26,U27 Check Speaker connecting Check U7,U26,U27 Audio Issue Noise Check Speaker one port Check U7,U26,U27 Check signal input source Sound low all source TV Check U7,U26,U27 Check U26,U27 power supply check signal source Back to default setting Check U7,U26,U27 4
TROUBLE SHOOTING FLOW CHART (2) TV No Sound Check or change U7,U18 Back to default setting Other Source CheckU18dcheck U26,U27 output Check Main Board and wire connecting R or L no sound all source one port all source Check Main Board dwiredU26,U27 output Check U7 Check Speaker connecting Check U7,U26,U27 Check Speaker connecting Check U7,U26,U27 Audio Issue Noise Check Speaker one port Check U7,U26,U27 Check signal input source Sound low all source TV Check U7,U26,U27 Check U26,U27 power supply check signal source Back to default setting Check U7,U26,U27 4
Service Manual
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TROUBLE SHOOTING FLOW CHART (3) Power on NG No Power No back light Key NG Check AC Cord Check the wire form Power Supply to Main Boar Check Power Supply Check Power Supply Check Main Board ( check Q10,Q13 ) Check front panel Check CONTROL Board Remote controller NG No Work Function issue Invalidity Check CONTROL Board Check Main Board ( U24 ) Check Remote controller Check CONTROL Board Check battery Power LED NG Automatic on/off CONTROL Board POWER LED NG Check Wire Check Power Supply Check Main Board 5
TROUBLE SHOOTING FLOW CHART (3) Power on NG No Power No back light Key NG Check AC Cord Check the wire form Power Supply to Main Boar Check Power Supply Check Power Supply Check Main Board ( check Q10,Q13 ) Check front panel Check CONTROL Board Remote controller NG No Work Function issue Invalidity Check CONTROL Board Check Main Board ( U24 ) Check Remote controller Check CONTROL Board Check battery Power LED NG Automatic on/off CONTROL Board POWER LED NG Check Wire Check Power Supply Check Main Board 5
Service Manual
Page 9
WIRING DIAGRAM R-CH SPEAKER INVERTER CN7 DVD BOARD CN6 CN1 POWER BOARD FCC Cable to LCD Panel J1 J3 TV MAIN BOARD J2 J5 J12 J11 J7 KEY/IR BOARD L-CH INVERTER 7 7
WIRING DIAGRAM R-CH SPEAKER INVERTER CN7 DVD BOARD CN6 CN1 POWER BOARD FCC Cable to LCD Panel J1 J3 TV MAIN BOARD J2 J5 J12 J11 J7 KEY/IR BOARD L-CH INVERTER 7 7
Service Manual
Page 25
...R317 6 820 BK5V VOUT GND VCC 2 4 R302 6 100 1 2 3 BK-5V R319 C301 0.1U + 2K4 2 4 GND C302 100U/16 6 SW301 1 3 5 POWER SW302 1 3 5 SOURCE SW305 1 3 5 MENU SW306 1 3 5 VOL DOWN SW307 1 3 5 VOL UP BK5V POWER R313 NC R314 240 R310 NC 2 4 6 SOURCE 2 GND 4 R316 6 430 MENU 2 4 R318 6 820 VOL DOWN 2 4 6 R320 2K4 VOL UP 2 4 6...2 R306 2K7 2 JP303 1 GNDJUMP GND Q302 2SC945 2 Green GND GND Eastech Electronics (Taiwan) Inc Model No: LT2030 P/N: LCC30 Description: Date: 2005/07/07 Approver: CONTROL BOARD Revision: DVR1 PagBeI:LL 1/1 Checker: Designer:
...R317 6 820 BK5V VOUT GND VCC 2 4 R302 6 100 1 2 3 BK-5V R319 C301 0.1U + 2K4 2 4 GND C302 100U/16 6 SW301 1 3 5 POWER SW302 1 3 5 SOURCE SW305 1 3 5 MENU SW306 1 3 5 VOL DOWN SW307 1 3 5 VOL UP BK5V POWER R313 NC R314 240 R310 NC 2 4 6 SOURCE 2 GND 4 R316 6 430 MENU 2 4 R318 6 820 VOL DOWN 2 4 6 R320 2K4 VOL UP 2 4 6...2 R306 2K7 2 JP303 1 GNDJUMP GND Q302 2SC945 2 Green GND GND Eastech Electronics (Taiwan) Inc Model No: LT2030 P/N: LCC30 Description: Date: 2005/07/07 Approver: CONTROL BOARD Revision: DVR1 PagBeI:LL 1/1 Checker: Designer: