Power supply capacitors, try taking a hair dryer and put it on the vents in the back and see if it will come on after warming it up for 3 or 4 mins, if it does its capacitors, you can replace them yourself if you can solder or replace the power board.
SOURCE: SONY GRAND WEGA KF-50WE610 can't turn on TV screen.
Ths 5 blinks usually indicate an AKB problem. There is a break in the video path. I'll look up your specific model and post the results here. Please update this if you wish to attempt the repair yourself.
Thanks,
Dan
SOURCE: Sony KF-50WE610 Tv won't turn on, red light blinks 6 times
3 times means Lamp and 6 means you have lost a voltage. You may have a thermal fuse blown.
This set has a common trouble with overheating caused by the drum fan located on top of the lamp housing clogged up with dust. When the lamp is getting old it runs hotter and that combined with the fan being clogged the thermal fuse blows. You must replace the lamp and thermal fuse. You must also clean out or replace the lamp fan. This drum type fan should be cleaned out every year or two depending on the environment.
SOURCE: Sony Grand WEGA KF-50WE610 LED blinks 4 times
Hi,
4 times blink shows Temp Error and requires temperature sensor replacement in Sony KF-50WE610 TV
SOURCE: Sony LCD KF-50WE610 no picture-red light blinking
3 times standby red light blinking shows that lamp cover has not been placed back properly after lamp replacement.
Make sure lamp cover, (the first thing that you removed to replace lamp in tv) is fixed securely then turn tv On.
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