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
Troubleshooting
Samsung Electronics 6-3
6-3 No Sound
Abnormal
Check the Pin 5
of the CN601(mute)
Check pins 9 and 11
of HC651
Abnormal (0V)
Check D859,D860,
F852, F853 on the SMPS
Check/Replace RL651
and m-com (IC901
Abnormal
Check pins 3 and 5 of
the Audio module
Normal ( 28V)
+_
Normal
Normal
Check pins 24 and 22
of the Audio mdl
Abnormal Normal
Check pins 16 and 18
of the audio mdl
Check/Replace
upc1853 (IC602)
Check/Replace KA2192,
TC4053BP on the A/V switch
Abnormal
Check/Replace
TDA9840
Check/Replace
IC601
Normal
Troubleshooting
6-4 Samsung Electronics
6-4 Horizontal Line
Abnormal
Normal
Check IC202 and its
peripherial circuits
Check IC301 and its
peripheral circuits
Check the Waveform of
IC202 Pin 15,16
6-5 Convergence Misaligned
Abnormal
Normal
Check
the waveform of each
terminal in Convergence Module
CN203
After checking the 26V
load line, check/replace
the Fuse F854, F855 on
the SMPS board
Check the Differential
Amplifier of each
Convergence terminal
Abnormal
Normal
Check the Waveform of
each terminal in Convergence
Module CN202
Replace the
Convergence Module.
Check the Circuits
Connected to each
terminal of Convergence
Module CN202
Check the voltage on
CN803 pins 4,6
Normal
Abnormal
+
_
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