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CONFIDENTIAL
5 Troubleshooting
5-1 No Power
Does proper DC 28 V appear at No
Check SMPS PCB and Adapter.
DC jack connected to CN112?
Yes
Does proper DC 5 V appear No
at Pin 1 of IC849 and Pin 2 of Check IC849, IC830 and IC828, IC852.
IC828, IC830, IC852?
Yes
Does proper DC 12 V appear at No
Check IC829.
Pin 2 of IC829?
Yes
Does proper DC 2.5 V appear at No
Check IC804, IC806 and IC807.
Pin 2 of IC804, IC806 and IC807?
Yes
Does proper DC 3.3 V appear at No
Check IC800, IC801 and IC805.
Pin 2 of IC800, IC801 and IC805?
Yes
Check IC811 and IC817.
LW29A13W/LW40A13W 5-1
5 Troubleshooting
CONFIDENTIAL
5-2 No Video (PC Analog Signal)
Power indicator is green
Does the signal appear at No Check the R, G, B signal line and
Pin 7, 15 and 22 of IC203? related the R, G, B signal line.
Yes
Does the clock pulse appear at No
Check IC203 and related circuit of IC203.
Pin 30 and 31 of IC203?
Yes
Does the colck pluse No
Check related circuit of IC838.
appear at Pin 4, 10 of IC838?
Yes
Replace LCD Panel.
5-2 LW29A13W/LW40A13W
5 Troubleshooting
CONFIDENTIAL
5-3 No Video (PC Digital Signal)
Power indicator is green
Does the signal appear at No Check R2018, 2019, 2020, 2021,
Pin 80, 81, 85, 86, 90, 91,
2022, 2023, 2024 and 2025.
93 and 94 of IC833?
Yes
Does the signal No
appear at RA603, RA631, Check IC833 and related circuit of IC833.
RA632 and RA633?
Yes
Replace LCD Panel.
5-4 No Picture (CVBS, S-VHS, Scart Video)
Check Pin 13, 15 (RF_CVBS1,
FR_CVBS2) of CN622? No
Check Tuner, Scart1, Scart2 connector.
Pin 9 (Scart1_Vin) of CN601
Pin 9 (Scart2_Vin) of CN621
Yes
Check Pin 3 (YIN), 5 (CIN) No
Check RCA, S-VHS connector.
and 7 (VCR) of CN601?
Yes
No Check related circuit of IC842
IC842 (VSP9437B)?
and replace IC842.
Yes
IC308, IC309 and replace it.
LW29A13W/LW40A13W 5-3
5 Troubleshooting
CONFIDENTIAL
5-5 No Sound (LW29A13W)
Does the Low signal at No
Check Pin 1 and 6 of CN113.
Pin 16 and of IC702?
Yes
Does the Low signal at No
Replace IC702.
Pin 17 of IC702
Yes
Check Pin 67 (QSS_IF),
Pin 53, 54 (Scart1_In), Pin 50, 51 No
Check CN703.
(Scart1_In), Pin 48, 47 (RCA),
of U458 (MSP3451)?
Yes
Replace IC831 (MSP 3451).
5-4 LW29A13W/LW40A13W
5 Troubleshooting
CONFIDENTIAL
5-6 No Sound (LW40A13W)
Does the Low signal at No
Check Pin 1 of CN624.
Pin 16 and of IC13?
Yes
Does the Low signal at No
Replace IC13.
Pin 17 of IC13
Yes
Check Pin 50, 52
(QSS_IF), Pin 44, 45 (RCA), No
Check CN629.
Pin 41, 42 (Scart1_In),
Pin 38, 39 (Scart1_In) of IC18?
Yes
Does the Digital signal at No
Check IC18 and related IC18?
Pin 8, 9 and 10 of IC15?
Yes
Check IC15 and realted IC15.
LW29A13W/LW40A13W 5-5
5 Troubleshooting
CONFIDENTIAL
5-7 LW40A13W (Digital Sound - coaxial optical)
Does the Low signal at No
Check Pin 1 of CN624.
Pin 16 of IC13?
Yes
Does the Low signal at No
Replace IC13.
Pin 17 of IC13?
Yes
Does the Digital signal at Pin 41 No
Check the CN627.
(coaxial), 43 (optical) IC15?
Yes
Does the Digital signal at No
Check IC15 and related IC15.
Pin 11, 12, 13 of IC15?
Yes
Check IC14.
5-6 LW29A13W/LW40A13W