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5 Troubleshooting
5-1 No Power

Does proper DC 14 V appear at No
Check SMPS PCB and adapter.
DC jack connected to CN12?



Yes


Does proper DC 5 V No
Check IC11.
appear at Pin 2 of IC11?



Yes


Does proper DC 14V No
Check IC11.
appear at Pin 1 of IC11?



Yes



Does proper DC 3.3 V appear at No
Check IC14.
Pin 3 of IC14?



Yes


Does proper DC 2.5 V appear at No
Check IC109 and IC17.
Pin 4 of IC109 and IC17?



Yes


Check IC23.




LW15E33C/LW17E34C 5-1
5 Troubleshooting

5-2 No Video (PC Signal)

Power indicator is green.

Yes

Does the signal appear No
at IC134, IC135, IC136 Check CN11.
of R, G, B input?


Yes


Does the clock pulse No
Check X21 and related circuit of X21.
appear at X21?



Yes


Does the clock pulse appear at
output of 15" No
Check related circuit of IC32.
RA313~318>17"?


Yes



Does the clock pulse appear at
No Replace 15"
output of 15"
17".
17"?



Yes


Replace LCD panel.




5-2 LW15E33C/LW17E34C
5 Troubleshooting

5-3 No Picture (TV, Video, S-Video)

Check Pin 55, 56 (S-Video)
and Pin 52 (VCR) and Pin 74 No Check CN41 (Tuner) and
and Pin 53 (RF-CVBS) CN26 (VCR connector).
of IC401 (VSP9407).


Yes


Does the signal appear at No Check IC401 (VSP9407)
RA33, RA34, RA311, RA312? and related circuit.


Yes


Does signal appear at
15" No
17" Check IC32 and related circuit .
of related IC32?


Yes


Check IC61, 62 and
15"
17".




LW15E33C/LW17E34C 5-3
5 Troubleshooting

5-4 No Sound


Does the signal appear at
Pin 67 (Tuner sound signal) and No Check CN11 (PC conector)
Pin 57, 56 (PC sound) and Pin 51, 50 and CN26 (VCR connector).
(VCR sound) of IC53 (MSP3421G)?


Yes


Does the signal appear at Pin 27, No
Check IC32 and related circuit.
28 of IC53 (MSP3421G)?



Yes



Does the signal appear No
Check IC55 (Audio amp) and related circuit.
at L53~L56?



Yes


Replace the speaker.




5-4 LW15E33C/LW17E34C