Service manual

37
Troubleshooting charts
No Power
(Standby Power : U801)
The Standby LED doesn’ t light up red.
YES
Approximately 150VDC is to C806.
NO
Check if F801 is open.
Check D801 (bridge rectifier).
YES
Check if voltages to PA17D is supplied to DTV
Decoder module and TV micro-processor.
(3.3A, 3.3B, 5V, 32V, 12V, and –12V)
Check the parts caused a short-circuit to
secondary circuits.
NO
YES
Check the impedance value of between Source
and Drain to U801. If the value is near zero
Ω
,
U801 is dead. Replace U801.
The following waveform is to drain of U801.
320Vp-p
100KHz
NO
YES
When pressing Power button, the color of Power
LED is green
END