No Power On; No Power - NEC MultiSync LCD1550ME Service Manual

9. No power on

9.1 No power on (1)
Check output voltage +5V, +15V is right or not.
Check power switch is turn on or not.
Check power cord(P801), Signal cable(P302), P802, P803 is connected right or not.
Check C805 is about DC 140V-330V or not.
Check C807 is over 10V or not.
Check pin 6 of I801 have same pulse or not.
Check pin 3 of T802 have same pulse or not.
Check peck voltage of R811 triangle pulse is up
to 1 volt or not.
Check D809, D810, C816, C821, T802 have
same short circuit, or the output +5V, +15V is
over load.
Check feedback circuit around I802, I803 and
the other components and repair them.
NG
OK
NG
OK
NG
OK
NG
OK
NG
OK
NG
OK
NG
OK
NG
OK
NG
OK
It is not power board problem.
Turn switch on.
Connect it right.
Check F801, D801, P801 and repair them.
Check R805, R803, ZD802,
Q801, I801 and repair them.
Check peripheral components of I801
and repair them. (e.g. Q805, Q806)
Check Q803, R813, R814, D806,
R812 and repair them.
Check D804, R807 and repair them.
Repair them.
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