I have finally gotten my tv up and running, with a new convergence card and convergence power supply.. after the installation of those components, It began the "flash the LED 3 times and not turn on trick" so i replaced the flyback as well. after that, it fired up, I went into the srevice menu, manually converged all of the aspects and it looked good, however, the top corners "bow" down a bit, and the sides 'bow" in at the top and bottom...the type of shape you would expect from a old tube tv...i just ignored that..
Anyways, now i had a nice looking picture, and it was just BARELY bowed on top anymore. I let the TV play for about 5 hours in the garage, it worked GREAT! i turned it off for the night, came out in the morning, and got the 3 flashes from the LED AGAIN! -- I just un-plugged it and plugged it back in, after that it fired right up! ---- BUT---
Now the picture is freaky looking... the colors are wrong. it doesnt look good anymore, but the convergence is still there, still aligned, and still has that wierd "bowed" effect to it. - where to now? AAARGH!!
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could be the DM board or convergance or possibly power supply capacitor is wearing out. Further testing of capacitors will have to be done to diagnose problems. You can use a capacitor tester or voltmeter to test capacitors. Also look for burn marks or swollen capacitors.
if you are putting in the whole board, you just have to unplug everything off the pld board, then there should be 4 screws holding it in, if you are doing the convergence IC's (there little black chipd, with about 20 wires on it), you will need 2 of them, and you have to turn the boart over, and unsolder the old ones, and solder the new ones, not an easy task, but not real hard eather, thats why service centers charge about 5 hundi to do it
One thing that comes to mind is the two main connectors on the power/deflection board. They have ribbon cable in them. If they are white in color. One of them plus the one on the convergence board that is the same size, needs to be replaced. If they are black they are good. Part number is 258686. If your serial number is between G13XXXXXX and G26XXXXXX this is a very good posibility.
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.
Did you replace the convergence board or the convergence power supply board? usually one color will be a problem with the convergence board and more than one color means the convergence power supply is the problem. Ebay isnt a good place for boards as you never know if the board is good. You can get the convergence or the convergence power supply boards at the following link along with free shipping and tech support. http://servicemanuals.vstore.ca/
when you go into menu do you see covergence in setup,if not then it is not your convergence boards,next to your fiyback transfomer this is the power supply board there is 3 small fuses the one in the middle opens FL231 they look like small brown square caps 0.4 amps.
Since this is an intermittent problem, I would first check the convergence board for cracked solder connections or other loose connectors (or leaky capacitors and diodes). If you still cannot find the problem, you will most likely have to replace the convergence board assembly p/n 264103. It can be quite difficult to re-converge if you do this unless you swap the two eeprom IC's on the original board to the new board IK210 and IK211 then Go Into The Service Menu Geometry And Set V Slope And H Position, Save, Then Back Out To the Customer Menu And Run AutoConvergence.