I have a KP-57WV7000 that will not turn on. I got

check lamp first

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)

High voltage in TV got problem and thats why TV gives 10 time blink error code.
Qualified TV tech will fix it as its bit complicated fix.

Hello,
Please mention how many times standby light blinks on your KP-57WS520
There would be bit long pause between blinks so count the blinks and let me know to help you.

Replace high voltage Trippler block.

Based on service manual info, it cant blinks 7 times as per symptoms, please count again blinks. It can be 5 times.
If its 7 times blink, Horizontal Deflection stopped in this case. If you want to repair it at your own, please let me know to guide you further but it is necessary you should have knowledge of electronics.

Sony
Model # KP-53HS10
Serial # 9718217
MFG 2000

Plugged in TV. Timer Standby Light just flashes continusly. No Picture and No Sound.

Well, those are really called CRT tubes and are way more expensive than your average bulb. I would not recommend fiixing a 7 or 8 year old (is that right?) projection TV with bad CRTs

does the standby light blink?