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There could be many items that can cause that symptom. However I always assume convergence on any rear projection which can easily be checked by unplugging the convergence amp board and then plugging in the set and press power , if the set powers up turn it back off, and you will know the convergence ICs and associated resistors on that board have failed. Although its easier to replace the board unless you have good soldering skills. I am pasting a pic of the board which is suspended above the main chassis just mark the wires then unplug the set from the wall first, but then unplug the wires from that board and then try powering up the set.if you need further assistance , respond to this same post
It looks like either failing convergence IC chips or a couple busted capacitors around them. This will need to be given for servicing. You could try a hard reset first though: Unplug the TV from the power socket, remove all cabling, wait 5 minutes and replug to wall socket and redo cabling.
However, I think that you could have either convergence problems or a failing power board, for which you will need to get the set serviced.
If it is a convergence issue, you can unplug the cable that connects the two boards all the way toward the front. If the tv comes on with a VERY bad picture(no convergence) then your problem is in the convergence ckt. If not, you could have problem with your small signal board. Also, the "yellow" problem you are having is that the cooling fluid in your blue tube is getting cloudy and needs to be changed.
If this is a ITC222 chassis then you need to check the fuses that are near the flyback. I would also unsolder all the pins on the flyback and re-solder them as the factory lead free solder tends to crack and cause issues with the convergence. Re-solder it with common 60/40 solder you can pick up from Radio Shack or other places.
This sounds like a bad convergence board.
You didn't mention the model but I bet its a samsung rear projection HDTV.
If the convergence board fails, you can diagnose by pulling the power leads to the 3 convergence circuits, then power on the tv, if it lights (picture will have very bad convergence) then that is most likely the cause.
You can usually buy a new convergence board for about $80-$100. Look on eBay by the make and model of the TV.
And its real easy to replace.
take off the back there is a board at the top right with two black stk-392-040 chips on it unplug the red connector at the left side of the board then plug set up and see if it comes on if so the chips on the board are bad or replace the board about $100.00
Yes the board can be replaced, but you may also need to do some touchup alighnment to the convergence, and maybe need to reprogram the magic focus or whatever the ato convergence is called on your set, if it has that feature, Good Luck