I have a Sony KP-53HS10 projection TV. It this evening, when I turned it on, it was flashing a "2" code (two flashes, pause, 2 flashes, pause, etc.). I tried the power button, which changed nothing. I pulled the power plug, and after plugging it back in, it's just flashing continuously. Any ideas?

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.

Hi
you have defctive power supply section, in the power oscillation circuit!

do you know how to repair a tv? if you know i teach you how to solved it.

Probable convergence amp IC bad.

you must check ic 7101.7201,7301 they are the possible problem

I've got exactly the same problem. Initially, I saw it flashing twice, pause, twice, pause, twice... I pulled the plug when it failed to respond at all. And then when I plugged it back in, it went into the continuous flashing mode. Halp!

or a new lamp. you could first replace the lamp.
the screen might work fine for a couple of seconds, but then it fades away or deteriorates. This means the lamp is going bad.

make sure it is 9 blinking it may be 10

I believe the problem is either in the G board ( power supply) or the D Board ( high voltage) as the 3 blinks indicate the G board, and 7 indicates the D board and 6 indicates the +5 line a and b boards. So with that many codes its most likely the G board (power supply) You can get a new replacement G board at the following link which comes with free tech support to help you plug the baord in which is very easy. Its listed under the Sony parts category and its the A-1316-566-A sony G board, Here is the link.
http://servicemanuals.vstore.ca/

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

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

does the red light give you a blinking code pause then code?