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Standby flashing light shows that tv got some internal problem. How many times standby light is flashing is info that provide info about what section of tv got problem. Count standby light blinks and let me know, there would be 3 seconds long pause in blinks so count pause to pause.
Count the number of blinks of the standby light. It will bink a count, pause and do it again (Common counts are 2 -9) Give this count to a Sony service center and they can help you know what the issue is. (Probably the lamp)
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
Please check batteries in remote that seems not working. Sony TV would either turns On or standby light will blinks if TV gets any internal problem. You question shows standby light stays On that means TV does not receive power on command from remote. If standby light is blinking in sequence, let me know how many times it is blinking and also intimate exact model number of TV to find out possible solution. Thanks.
When that model Sony shuts down the LED starts blinking as you say but it is telling you something because it blinks a certain number of times and then pauses and repeats the number of blinks. Count the number and then I might be able to help you narrow down where the trouble is.
You need to check supply volts on main micro IC702 on main board of Sony KP-51WS520 TV. If you have experience of big TV repair then I would recommend to get service manual of TV from any online store and check above said IC supply volts. TV must give error by blinking light in case any problem in drive circuits and if main micro fried, no error signal will be there.
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.
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