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I purchased a service manual and there are no specific blink codes, and three lights are normal, I checked the capacitors first thing w/esr meter and output voltages are ok.
I would also visually check the caps, as I suggested.
The blinks do mean something. Can you please count the number of times it blinks? Or does it vary?
I did visually check the caps on both power boards, and actually changed 3 small problem caps that checked marginal. The blinking light is the led light blinking green and it varies, sometimes 10 blinks, sometimes less, then no lights for several minuets till TV shuts down and then get red standby light.
Can you hear the fan running? If not, it could be the fan. If you do hear the fan running, then the lamp may need to be replaced. The behavior you describe will happen when either the lamp or the fan fail.
I mentioned in my first post that the fans were running and its a led DLP, there is no lamp, a red, blue, and green led, and you can see they are on when the set is running.
You provide no answers to my responses but want me to rate to finish!