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Old 10-08-2021, 08:21 AM   #1
shelby5041
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Join Date: Feb 2009
My Country: united states of america usa
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Default Samsung LCD TV no picture backlight on no 12v at tcon

hi
i have a samsung lcd tv

it powers on with sound and backlight but no picture

all voltages from PS are good 12v 3.3v and 5v

whats odd is that at the tcon i tested voltage across the fuse on the tcon and i get 0v

i figured main board issue..so i ordered a used main board....when i put replacement main board in i still have same issue

no 12v at the tcon fuse

i disconnect the panel ribbon cables to rule out any panel issues and i still have no 12v at the tcon fuse

the odds of having 2 main boards with exact same problem is rare but could happen

could this actually be a bad tcon board? ..maybe is shorted out and not allowing main board to send the 12v?..or is this not a possibility.

thank you
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Old 10-08-2021, 09:18 AM   #2
shelby5041
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Default Re: Samsung LCD TV no picture backlight on no 12v at tcon

i think issue may actually be tcon...if i remove the tcon cable from the main board i now have the 12v at main board check point....so maybe tcon is shorted out which causes to lose 12v at main board to tcon?
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Old 10-13-2021, 05:56 PM   #3
shelby5041
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Default Re: Samsung LCD TV no picture backlight on no 12v at tcon

It was faulty tcon causing main board to shut 12v off

Replaced tcon ..$8...now works great
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