Sony Trinitron Wega KV-27FS100, Made in Mexico, Chasis BA5D.
Once the TV is on, after a few secons or minutes (it varies), the picture goes off, the sound stays on, LED timer light flashes 5 times, picture comes back on, and the same thing happens over and over again.
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Hope you find this manual useful. If there is any specific problem you are trying to address then do not hesitate to describe it on Fixya and someone will be able to help out. https://docs.sony.com/release/KV32FS100.PDF
The 4 blinks usually indicate a vertical problem. If you can solder, you can fix this yourself. Let me know if you wish to attempt this repair. If not, expect a parts cost of $10-$15 plus the local labor rate for the repair.
That doesn't make sense. When you state that the TV comes on 5 minutes later, doo you mean that you get sound right away but hte picture comes on later? If so, a :power board" won't help. Please update this so we can narrow down the problem and get you a solution.
if it is white brightlines along with blue back ground please check
1 sypply to blue video output transformer.
2 crt base or connector loose.
3 check components related to blue video ckt & blue video output transistor.
4 blue signal reaching to blue video section
5 verv very rare case if set is old set then there is a possibility of crt.
hope this will help.