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Troubleshoot of Power On Problem (2/2)
< symptom >
SOS 1 blink
Check short circuit of
Q7801,7803
OK
Shorted
Q7801,7803
(IC7800)
Voltage Check of VLED
Just before shutdown
(rise up from 38V to 71V)
NG
(38V or lower)
Voltage Check of PWM
Signal input (pin4) of C7800
Just before shutdown
Keep 0V
IC8001
LCD Panel
OK
(71V)
IC7800
Rise up
(Not 0V)
7
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