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Troubleshoot of Power On Problem (1/2)
Check by power on sequence ( from
< symptom >
No Power/No Operation
1st
Check output voltage of
STB5V, STB3.3V
3rd
4th
OK
Check TV_SUB_ON signal (=High)
and voltage P16.3V line
6th
7th
OK
Check short circuit of each power line
SUB5V,SUB3.3V,DDR1.8V,VCCK1.1V
(PNL12V,TNR3.3V,TNR1.8V)
8th
9th
All OK
If all output voltages are OK,
IC8001
to
)
13th
Check input voltage of
IC7503 (16V) and
Check VLED voltage (38V)
No or
at P2-3pin
Low voltage
2nd
IC7503/IC8708
(check short circuit of STB power line)
No signal = IC8001
No P16.3V = Q7502/D7502
NG
Power IC of Defective line
NG
F7101/CF7101
Q7301/IC7301/D7317,
NG
D7502/IC7503
OK
6
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