Page 1
CONFIDENTIAL
GD15N*/GD15A* 5-1
5 Troubleshooting
5-1 No Power
Does proper DC 14 V appear at
DC jack connected to CN101?
Check SMPS PCB and Adapter.
Yes
No
Does proper DC 5 V
appear at Pin 4 of IC101?
Check IC101.
Check IC201.
Yes
No
Does proper DC 2.5 V appear at
Pin 2, 4 of IC109, IC104?
Check IC199, IC104.
Yes
No
Does proper DC 3.3 V
appear at Pin 3 of IC103?
Check IC103.
Yes
No
Page 2
CONFIDENTIAL
5 Troubleshooting
5-2 GD15N*/GD15A*
5-2 No Video (PC Signal)
Power indicator is green.
Does the signal appear at
R132, R133, R134?
Check R132, R133, R134, R137, R138,
R139, R103, R104, R105.
Yes
No
Does the clock pulse
appear at R357?
Check related circuit of IC301, FT301.
Yes
No
Does the clock pulse appear at
output of RA306 ~ RA311?
Check related circuit of IC301.
Yes
No
Does the clock pulse
appear at Pin 12 of IC204?
Check IC204 and related circuit of IC204.
Yes
No
Does the clock pulse appear at
output Pin 39, 40 of IC403?
Replace IC403.
Replace LCD Panel.
Yes
No
Page 3
CONFIDENTIAL
5 Troubleshooting
GD15N*/GD15A* 5-3
5-3 No Picture (TV, Video 1, Video 2)
Check Pin 8 (AGC)
of IC703 (CN402).
Check replace the tuner.
Yes
No
Check Pin 72, 73, 74 of IC402.
Replace IC402.
Yes
No
Does the signal appear at D405.
Check related circuit of
D405 and replace D405.
Yes
No
Check IC301 and replace mainboard.
Page 4
5 Troubleshooting
5-4 GD15N*/GD15A*
CONFIDENTIAL
Does the low signal
at R528, R529?
Check related circuit of
R528, R529 and replace.
Yes
No
Check Pin 14, 17
of IC502 (TDA7496).
Replace IC502.
Yes
No
Check Pin 60, 67 of
IC501 (MSP25/10).
Replace IC501 (MSP25/10).
Yes
No
Check related circuit of
IC501, IC502 and tuner.
5-4 No Sound
Loading...