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Re: Blue light flashing - no picture speakers thump
Do not remove the rear panel with the power cord still plugged in on your model or you will instantly wipe out the digital circuits. Its a safety feature. remove the front speaker grille screws are on the side and inside the door under power button. Then after you remove the speaker grille remove the small access panel and you will see the convergence board on the right side thre are 3 wire plugs on the right side of the convergence board. Un plug thos 3 wire plugs and try to power up the set if it powers up the problem is convergence. If it doesnt its the deflection. If you need the deflection board go to the following link they have one. http://servicemanuals.vstore.ca/
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take off the front panel and unplug the convergance board up front just behinf panel if the set now comes on replace your con amps if not you have a power supply issue more than likly the con amps are bad
Hi Chin, Please check faded color resistors (in big size) on D board and also check dry solder joints on D board. If above seems OK then ICs STK-392-560 are suspected and needs to be replaced. Let me know if you need further info.
when you replaced the convergence amps did you check and replace the resistors? it seems like they always take out two or more resistors. the problem is on the convergence board, i have the same tv that did the same thing. if the speakers are still thumping, you may have got a dud amp. i recommend using the factory stk392-110 amps. make sure all of your solder connections are good and none of them are touching. also, when you get the set back on you will need to manually adjust the convergence from the menu. you will need the factory remote. if you find bad resistors, the values are on them, but if you need the values and wattage, then use this page:
it is most likely the convergence panel. do your speakers make a thumping sound? if not, disregard this solution. change the stk392-110 convergence amps located behind the front cover on the convergence board. also check the resistors, it seems like they always take out two or more resistors. make sure all
of your solder connections are good and none of them are touching.
also, when you get the set back on you will need to manually adjust the
convergence from the menu. you will need the factory remote. if you
find bad resistors, the values are on them, but if you need the values
and wattage, then use this page:
Replace the convergence IC`s again using original Sanyo chips (STK 392-110 or STK 392-180). Make sure to use plenty of heat sink compound. Coat the entire back side of the chips. Also look to see if any of the low ohm resistors are burned. A shorted chip will cause the thumping sound and the set will shutdown. I am guessing that you used generic IC`s as a replacement. They are cheap and the leggs fall off when you apply too much heat during soldering. Dont wory about the CRT driver or the deflection board, they are probably fine.