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here is a link I found when I Googled kp51ws520 4 blinks ---it might help you and also the plus and minus 15 volts they are talking about also goes to the convergence circuit I think:
internal power supply problem. needs to be checked by service tech shop. also try a different power outlet to see if the set does the same thing? if it does then follow the above.
Try connecting the TV directly to a different wall outlet and check. If the issue persists, try power resetting the TV. Turn Off the TV and remove the power plug from the wall outlet for 1 minute and reconnect it and check the operation. If the issue persists, then the TV requires service.
Ck small blue capacitor next to hori output Transistor 2k volts they have been known to go Bad, if its OK replace Both of your STK ICs STK392-110s use 180s Mats has them 1-800-628-1118
When a Sony TV flashes five times, that means that there is an AKB circuit fault. Six blinks is also a fault related to video problems, and regards a fault concerning the digital board and the Jungle IC (the main CPU).
This means that there is something wrong with the video.
Try first unplugging power for few hours, if that does not work, call a
technician, as several IC and components must be tested and eventually
replaced.
Heres what the 6 blinks means with your model. Here is a link where you can gey the full service manual for your set with trouble shooting and full part number list. they email them Instantly after purchase
• +5 line is overloaded.
(A and BM Boards)
• +5 line is shorted. (A and BM Boards)
• IC303 is faulty. (A Board)
When a Sony TV flashes five times, that means that there is an AKB circuit fault.
This means that there is something wrong with the video.
When you get this error, several IC and components concerning the video signal must be tested and eventually
replaced.
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