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Sampo KM-777 Monitor Main Board PWB-3177-4

 
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Dishfarmer
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PostPosted: Thu May 05, 2011 9:54 pm    Post subject: Sampo KM-777 Monitor Main Board PWB-3177-4 Reply with quote

Smile Hi Everyone,
Looking for any ideas with a dead CRT Monitor as above, nil pwr to tri colour LED. Only life is a click from the smps transformer once a second.
I have changed the PWM IC and checked the FET on the primary, checked the HOT and all the main caps on the +70V rail.

Giving a VGA input signal nil effect either.
Something is loading the main rails down or maybe the smps trasformer is shorted or the horz o/p transistor is still defective?
Any ideas appreciated.
Aar Razz on.
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