Makvision 3M25 Shutdown/mode switch problem

QbertWPC

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Working on a Makvision(Wei-Ya) Tri Mode monitor. It is installed in a Mid Res game, and at random times appears to shutdown or "sleep" and goes into 15k mode without displaying a picture. When "shutdown", it makes the "15K squeal".

Unplugging the signal input connector and reconnecting "wakes up" the monitor. The monitor then works for a day or more before having the same problem again.

No, no cracked solder joints were found.

If it's important to know, this one's a Oct. 2006 production unit, never serviced before.
 
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