I have a Mitsubishi VS683R Rear Projection which appears to have a scrambled picture or sync problem. I have heard in the past that these sets had problems with PIP modules, However this set does not have a seperate PIP PCB. There is a very large board with a tuner, some audio circuits and IF circuits.Also on the tuner board is what appears to be a PIP circuit (not a module).There is no sync controls inside on the deflection board. Is this a bad tuner is that a PIP circuit on that large PCB with the tuner?
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So, You have Five cable leads, The rgb get plugged into there corresponding colors and the other two are your Red and White Audio Input ------Correct? You do not use the in4, that is for a pc with horiz and vert sync. You use input 1 rgb and plug the red and white into the audio input.....your done!
there is a complete section in the tv that translate the different resolutions from the different out side video sources you normally use to the TV native resolution. That area has to be replaced. Is a module repair needed. Don't get scare. now days this kind of repair is normal and has to be included in the repair price to see if is economical to repair.
This problem is on the 'formatter' board. This is NLA, so it has to repaired, theses parts are surface mounted
Tile or block pattern with no video or OSD. Check D8F00 and D8F01 part # 264P828010, also check C8F26 and C8F29 part # 141P148000 (1 uFD, 25 V) on the FMT PCB (part # 930B924002).
I hope this helpful and not too late.
Good luck, big IRISH.
It sounds like the Picture in Picture PC Board. Its a little stand up type board that has a bunch of small capacitors on it and it goes bad just the way you descrbed cause its clipping the sync out of the video. I dont was told it wasent available anymore and there was a kit available to jump out the board on ebay somewhere. If you know electronics then you should have no problem locating and possibly getting a part from a shop that may still have one BUT if you dont know the insides of the TV set get a pro to assist you as theres a lot of voltage kickin around inside of a set even when its unpluged. Good Luck