My XBOX360 says E 74, and has a red blinking light in the lower right corner.

the psu has failed prob a CCFL fault as it flashes red
the low voltages like 5v is ok

get it serviced by a tv person i think its more too do with the lcd panel

remove the update..... look for the previous firmware and re-install.

Likely damage to main power supply-------try to see if there is a specific number of blinks then a pause and repeats like 7 blinks a pause and repeats---that is an error code if there---with it AND THE MODEL NUMBER OF THE TV I might be able or not to help.

power supply faulty it stays in protckt mode or the fan is not workin that cools the heatsink

The flashing light indicates a failure with-in the tv, the amount of blinks will coincide with a particular fault scenario. Tell me how many times the light blinks and I can tell you the problem. However, the tv will need servicing from your local shop. This tv is too complex to walk you through fixing this problem with Philips plasma tvs.

The G.P.U. is come unsolder from the mother board. Send it to MS
Quick before it does something that's not covered by the warranty.
when you get your newer box back have a good repair shop do
an x clamp mod ,and your xbox problems will be a distant memory.

Trust me I been fixing them for years.

Repairtech

you have a bad lamp

red power light blinks

SAMSUNG HLS4676SX UNEXPECTEDLY SHUTS DOWN DURING USE. PILOT LIGHT (GREEN/LOWER RIGHT CORNER) BLINKS FOLLOWING SHUTDOWN. PROBLEM CAUSE? SERVICE MANUAL COVER THIS PROBLEM?