Question about Mitsubishi VS-50705 50" Rear Projection Television
The problem began with a rolling picture broken by several horizontal bars for half an hour and then the roll would cease and as long as the unit was left on, the picture would remain steady. Suspect vertical control circuit and convergence output amplifier STK's. No bad solder joints or broken trace are apparent. wiggle and tap tests yield no changes. Signal from pin 7 on IC802 is ringing with all sorts of overlapping signals. This had me believing the problem was a bad solder joint or crack in the trace...possibly bad amp. I wanted to test using manual circuit adjustment however the unit would not permit entry in to Service Adjustment Mode despite setting Direct key entry mode to "On". Since beginning to troubleshoot the signal and main boards, the unit suddenly ceased to complete powering on. Have STBY 12V on board and the fuses are intact....130V and 18V + HV is present for an instant and it would seem a protection circuit kills the process before it can complete.
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Posted on Jan 02, 2017
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