Samsung SP4388PTRX, SPM5288PTR, SPM4388PTR Troubleshooting

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

+

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