SOURCE: Standby LED flashes red 4 times with pause then 4 times
You either have a bad fan or one of the rotation sensors mounted on one of the fans has failed. Take the back off the set and see it the main fan slightly right of center is rotating. If it is, there are two more fans, one mounted right above the lamp and another on the optical block itself. You will have to pull the optical block to check those.
SOURCE: pioneer pdp 502mx goes to standby no picture after power on
Contact Pioneer at 1-800-421-1404 about getting an in-home power supply replacement. This is a known issue with some plasma displays. Some of you would experience a loud pop and then the power supply fails. You get a red light below the ON button, when you press on, the red light will turn green for a second and then back to red. The plasma display will not turn on after the power supply fails. Call Pioneer at 1-800-421-1404.
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SOURCE: Samsung HLP4674W - changed bulb - still no picture - lights flash
If the lamp has been replaced I would think the Lamp ballast would be most likliest followed by the color wheel and then the Digital board. You can get any part needed for your model at www.tvrepairworld.com just leave them a email they respond quickly.
SOURCE: I replaced the main board in my sony Kdl-32S300.
B+ over voltage protection (OVP), unit goes to the standby mode then
displays the 3 blink fault. This is also a problem in the power
supply circuit, check T603 and R672.
Have you set the output voltage correctly?
SOURCE: SONY KDL-40S4100 flashes 5 times
try to force on the tv un plug and use remote when tv iv completly off. and press display 5 vol+ then power and see if tv stays on and in service menu look for eror code .if tv stays on if it cutts off then one of lamp in screen is defective. its mean screen defective
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