You may not have to buy a new board. It just might be the Convergence Amplifiers that have gone bad. You may just want to replace them first and then see if it corrects your problem before getting the whole board. The convergence amplifiers are easily
identified they are tow big black modules attached to a big metal frame called a heat sync, normally it will be located on the right rear section of the TV set looking at it from the back or it would be located in the middle rear of the set looking at it from the rear. In any even look for two big six sided black components
with 21-22 pins, now this is the important parts some electronics parts stores sell what are called Convergence Kits (Yes this problem is so common that they have put kits together to repair this issue), they contain the two modules and the biasing resistors needed to properly do the job. You will have to order the kit for your make and model of TV if they do not have a kit, you will have to use a schematic diagram to find the values of the biasing resistors needed. Once you have the modules and the biasing resistors
, you will have to de-solder
the modules and the associated resistors and replace them with the ones you purchased. You will also need to detach the modules from the heat sink clean the heat sink (with alcohol) and then attach the new modules (with a new application of heat sink paste, which is the white stuff the you removed with the alcohol) with the screws you removed to detach the modules. Once the modules and biasing resistors are installed you will need to turn on the TV and then perform a convergence setup, your TV most likely
will have an auto convergence alignment
setup feature on the setup menu , use this to do the convergence alignment setup (check your users manual for help in doing this). The cost for this repair will be as follows:
2 STK392-1XX series Convergence Amplifiers $4.00-$15.00 USD
Total $8.00 - $30.00 USD
9-10 biasing resistors $5.00-$10.00 USD (multipack) $15.00 USD
Solder $5.00 USD
Soldering Iron $20.00 USD
Silicone Heat sink paste $6.00 USD
de-soldering brade $5.00
The cost of materials will be about $81.00 on the high end.
The cost of a new board will be about $150.00 - $200.00 depending on the vendor.
You can buy replacement boards from a manufacture approved vendor outlet, go to the manufacture's site find support and parts they should have a listing of supported vendors. I would suggest calling the vendor and ordering from the phone asking them to send you an RMA for the part (board) this protect you from having them asses charges without delivery of product.
You will need the schematic diagram to help you install it schematics can be purchased at http://www.servicemanuals.net
for about $19.00 USD.
I hope this helps,