TV comes on stays on for a short time than goes black with loss of sound green flashing light untill TV comes back on. takes maybe 2 min.

Ebay lamps can cause this as they are not originals also the balast supply, is gas discharge type, can fail.

A shorted main circuit board.

remove lamp assy and see if is bad,4 year is abouth time fornew lamp.

TV has gone into "protect mode" to do just that to protect against the damaging failure that has been detected, you will need a servicer to diagnose the failure. Good luck and Merry Christmas!

sounds like the lamp is failing.

Sounds Lamp is weak in this TV.
Please replace lamp and procedure is written in TV user manual.

that is a common problem with this rca's check the convergence board for a short circuit
more likely is a transistor or an convergence ic

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After being on a little while, the screen goes black (no audio as well) for 20 to 30 seconds. Green light stays on. Then, picture comes back on and takes a couple of seconds to get up to full brightness. About 5 seconds or so after the video comes back, the audio returns.

Until this morning, has only happened a couple of times a day, now happening more often. About 3 times in last 20 minutes.

KDF-E55A20 is about 3 years old.

The bulb was loose, pulled it out, put it bakc in and tightened the screww. Works like a champ