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Troubleshooting
Samsung Electronics 6-1
6. Troubleshooting
6-1 No Power
Normal
Check CN801 Pin 2
(STB B ).
Check C801
Check F851.
Check the voltage
on CN801 Pin 1
Check the base voltage
on Q852
Check/Replace
Q851 and Q852.
Check/Replace
Q854.
Check/Replace
D808 & R801
Normal
Normal 0V
Normal 12V
Abnormal 0V
Abnormal
Abnormal 0.6V
0V
3V
Check/Replace
Q401 and Q402
Replace F854
Check IC901
(VCC)
Normal
Check IC901
Peripheral Circuits
Replace IC901
Abnormal
Abnormal
Check/Replace
HC801
+
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Troubleshooting
6-2 Samsung Electronics
6-2 No Picture
Abnormal
Normal
Check Pin 8 of IC501,
IC502, IC503
Check TDA4780
(IC203) Pin 1, Pin 13
Low-High
Check TDA9160 (IC202)
Y-output (Pin 1)
Check/Replace
m-com (IC901
Replace
TDA9160 (IC202)
Normal
Check TDA4780
Y-input (Pin 8)
Abnormal
Check/Replace
IC203
Abnormal
Normal