Here is what you have been asking.
q901 --- K2645
q902 --- KSP44
u90 --- uc 3842P
It seems you problem is in the power supply switching circuit.
I hope this will solve your problem.
Please let me know if this has solved your problem
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It sounds like you have intermittent solder connections that are causing problems. With the back on, the board is flexing enough to make some connection(s) fail. Use a strong light and a magnifying glass to examine the solder side of the circuit board for bad connections, especially around parts mounted on heatsinks.
it could be th epower supply and it could be the monitor.
power ON button should not flash orange regardless what you do. it should stay green. then orange. not orange to green to orange.
try the monitor on another PC if you can fine one.
the other thing is are the 2 monitor similar (CRT to CRT and LCD to LCD), you can't mix the the two, they will work but need different video driver to function correctly.