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"backlight on" volts should be 3-5v from main logic board then 24v to inverter 7 red flashes- main board over heating, can be short on power board or main logic board 8 red flashes- main board sp prot, try power reset, update with usb, or replace main logic board 9 blinks- check fan error, * if TV has fans 10 blinks- digital board or tuner board * some Sony TVs may not have this board 11 red flashes- bad main board, bad IC, replace main logic board 12 red light flashes is tcon error bad T-con board or bad LCD panel, replace tcon board usually 13 red flashing is backlight balance error bad lcd panel or inverter boards (common) or bal board on kdl-52v4100 only, replace inverter board usually then main logic board 14 red flashes HFR- bad TCON or Bad LCD panel, replace tcon board.
I've also recently plugged a NUC (mini-computer) into it and use the TV as a standard PC monitor and this is when you see the decline in sharpness (browsing websites..etc).
Di Y How to fix phones, TVs, tablets, PCs, and more tech.
Replacing touchscreen, fixing TVs that have no power, and more.
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