Picture is bowed at top &bottom,have the back off a guy said ther are adjustments that can be made,were?,my son was jumping in front of it and picture edges are bowed,verry dusty inside on the lenses,vacumed all the dust &cleaned the lenses,anything else i can do to fix?
SOURCE: rca projection
Conversion problem most likely. Do your conversion controls work both colors in all 4 directions.
Posted on Jan 04, 2008
SOURCE: RCA P61940 PROJECTION TV
No adjustment will fix this, what has happened is a power supply board for the convergance has failed and needs to be replaced or repaired
Posted on Mar 07, 2008
SOURCE: Help with RCA projection TV P46812BL (chasis ptk195AA)
Hi,
your tv requires STK730-020 quantity 02 and you can replace it yourself if you know soldering well.
If you wanna replace complete convergence board, its available Part Store and price is $119
Regards,
Posted on Sep 13, 2008
SOURCE: I have a 53 in. sony projection tv,. bowed picture tubes?!?
Replace Both STK convergence ICs will have part number on them STK392-560 use same part number on your STKs. Also around ICs ck pico fuses 5/6amps they are green or yellow.
Posted on Jan 08, 2009
SOURCE: 55 inch mitsubishi rear projection tv red lamp out of adjustment
Have convergence IC's replaced. I believe this unit uses STK-392-570 convergence IC's Only one has gone bad but replace them both, because if one has failed then the other is not far behind, for Blue and Green. One handles Red, One handles BLUE and Grn. There are only two of them in the set, They are the two largest IC's in the entire set.
Posted on Oct 01, 2009
Sounds like the blue convergence circuit still not working.
Assuming both IC's are good, look for open soldered-in pico fuse.
Once bowing problem is solved,then convergence should adjust ok.
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