Samsung 203B Service Manual - Page 34

No Video PC Analog Signal

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4-2 No Video (PC Analog Signal) 4 Troubleshooting 6 Is pin9 of CN501(BKLT_EN)high(3.3V)? No Check TFT_LCD panel or inverter and connection between then. Yes Does the analog video signal No 7 appear at R101,105, 108 (Red,Green,Blue)? Yes 8 Does the X201 and X200 No oscilate Properly? Yes Does the proper clock pules No 10 appear at Pin6,7 of the CN201? Yes Replace LCD Panel. Check pc signal. Check the X200, IC201. Check IC302 and IC201. 4-3

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4 Troubleshooting
4-3
Is pin9 of
CN501(BKLT_EN)high(3.3V)?
4-2 No Video (PC Analog Signal)
6
Check TFT_LCD panel or inverter
and connection between then.
Yes
No
Does the analog video signal
appear at R101,105, 108
(Red,Green,Blue)?
Check pc signal.
Yes
No
Does the X201 and X200
oscilate Properly?
Check the X200, IC201.
No
Yes
Does the proper clock pules
appear at Pin6,7 of
the CN201?
Check IC302 and IC201.
No
Yes
Replace LCD Panel.
7
8
10