Question about Sony Grand WEGA KDP-57WS550 57" Rear Projection HDTV-Ready Television
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Posted on Sep 06, 2009
Most probably replacing the convergence STKIC should solve this problems.but in some cases the capacitors on the convergence also go bad.the capacitors which go bad looks buldged up from its top or have burned marks on their side or they look bit loose from the board.but if all the capacitors look perfect and convergence ic is soldered properly .then in some cases the convergence board it self gets faulty this is very rare but in some cases it has been seen that convergence board circuit gets short internally and convergence board is dead completely.so the board needs replacement.so check out the convergence ic which you have connected are they properly connected and with proper position and next check the capacitors on the board.if all ok the convergence board is faulty.-----
TO replace the board
whole signal/convergence board cost for about $360.00 plus shipping .you can get it at -------
Here are instructions for removing this board wether you want to replace it or want to know how to get it out to replace the STK ICs.
First get the back cover off the tv (6 hex screws) now we will lift part of the chassis out so you aren't putting your screwdriver near the tube driver boards for safetys sake. You will notice there is a plastic frame screwed to the wood frame of the tv. There are 3 wood screws along the back bottom edge of the TV securing a plastic frame down loosen them. Now GENTLY pull the plastic frame which the boards are screwed on back and angle it out to the right the HV wires have plenty of slack for you to remove the signal board. If wires from the signal board are obstructing try pulling them out of their cable clamps to give you more slack.
You don't need to discharge the RED (high voltage wires) from the flyback and its relatively safe to work around them just don't go poking Mr. Screwdriver on them. Or touch any area of the biege power board the signal board is the green one on the right of the tv looking from the back. To disconnect the power from the signal board to the power board get a flat head screwdriver and you'll notice 3 connectors from the signal board to the power board and on the power board side you will see small flaps protruding from the connectors GENTLY pry them up with the screwdriver. Pull out all the connectors from the board if you wish take pictures of them or draw a diagram while they only plug in one place its pretty time consuming if you forget where they go.
Now loosen the screws from the board to the plastic frame and the support for AV board at the back (4 screws) then remove the little screws visible near the A/V Phono connectors once all of them are out pull the little plastic bezel off. Now if you wish pull up on the A/V board and it disconnect from the signal board. Now for removing the board itself don't pull straight up on the board or you'll break it pull it up from the power board side first then slide it to the left and pull it out. If the board doesn't come up check for screws DON'T FORCE or you may crack the board.
Replacing the board is very straight forward the connectors will only connect in one place so you can't screw them up. Also there were 2 vacant connections where no cables connected one on the metal shielded tuner board and another on the signal board. The only thing you have to watch is the 3 plugs for the tubes my cables were marked from the factory the red connector had a red line on it same for the blue and the green had no mark because its the remaining cable. Just match them up to the printed Red, Green, and Blue on the board and you can't go wrong . But if you do all that will happen is your TV colors will be all funky.so connect it at the excy position. this will help. ---- thanks.please do rate the solution.thank you for using fixya.keep updated.
Posted on Sep 06, 2009
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Posted on Jan 02, 2017
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