Mitsubishi VS-4543 looses picture

[Mike]

i got a call yesterday of a mitsubishi that had convergence gittering that
goes away when tapping the TV, and eventually but intermittently, the
picture will go, but the sound stays working.
Well, i went out there yesterday to service it, and it was reeked with bad
solderjoints, so i resoldered the main board. the convergence gittering went
away, and had a nice picture. it stayed on for a good 30 minutes or so.

but i got a return call again today, saying the picture is still going
black. she said the picture wont come back on unless the TV sits for awhile.
She also mentioned that if the TV is left on with the sound playing,
eventually maybe an hour or so, the picture will come back by itself.

See that sounds like bad solder, but i already got most of that.

the convergence has been fixed, but the picture still goes dead at random
intervals, it could last an hour, sometimes 2, sometimes all day, then other
times maybe 10 minutes.

I went over the board with solder, so i know that cant be the issue. unless
there is another board i missed somewhere. I did see a couple of riser
boards on the mainboard, but i didnt get to those.


Any ideas? anyone had this issue with this chassis before?

 

[Golf]

I found some info on this model for same problem. Assuming the on
screen display works (vertical IC OK), check/resolder yoke plug on all
PCB's. Any one of these could cause this symptom. Obviously you could
tap each connector to see if video comes back which points to
defective plug. Good luck.

 

[Leonard Caillouet]

Resolder the connections at the yokes under the little gray cover on the
small PCB.

Leonard