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Dell 17" Monitor - Model M781p - black screen, constantly clicking relay

J

Jim

Jan 1, 1970
0
Has anyone experienced the following problem? I have a Dell Model
M781p 17" monitor that died coincidentally at the same time that I did
a normal "shutdown" for an impending thunderstorm. Now the monitor
when powered on, has a constantly clicking relay, no video (black
screen), appears to have high voltage (unit crackles when power
applied) although I have not measured it yet. Does not matter whether
it is connected to the PC or not. Not sure what the function of the
relay that is clicking is. Have tried to locate schematic, but
haven't had any luck. Did a measurement check of the power supply
fuses, diodes and transistors, all appears to be ok. Did not find any
bad solder joints or bad circuit board connections. Any ideas on what
could be the problem or what to check next? Any help is appreciated.
 
A

Asimov

Jan 1, 1970
0
"Jim" bravely wrote to "All" (15 Sep 04 19:35:19)
--- on the heady topic of "Dell 17" Monitor - Model M781p - black screen,
constantly clicking rela"

Ji> From: [email protected] (Jim)

Ji> Has anyone experienced the following problem? I have a Dell Model
Ji> M781p 17" monitor that died coincidentally at the same time that I did
Ji> a normal "shutdown" for an impending thunderstorm. Now the monitor
Ji> when powered on, has a constantly clicking relay, no video (black
Ji> screen), appears to have high voltage (unit crackles when power
Ji> applied) although I have not measured it yet. Does not matter whether
Ji> it is connected to the PC or not. Not sure what the function of the
Ji> relay that is clicking is. Have tried to locate schematic, but
Ji> haven't had any luck. Did a measurement check of the power supply
Ji> fuses, diodes and transistors, all appears to be ok. Did not find any
Ji> bad solder joints or bad circuit board connections. Any ideas on what
Ji> could be the problem or what to check next? Any help is appreciated.


Just a couple of guesses:
Maybe the HV is too high?
Maybe a shorted deflection coil?
Maybe the vertical IC is shorted?
Maybe a bad relay driver?

I'd place a bet on the vertical failure. Hard to say from this side.

A*s*i*m*o*v

.... No electrons were harmed in the posting of this message.
 
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