Get half a picture if I disconnect the left T-Con ribbon cable.
Otherwise no picture, no menu or whole screen lights up with random patterns.
Replaced main board, T-Con board, ribbon cables, all twice.
Trouble appeared after replacing all LEDs successfully.
Flashlight revealed readable menu at the very beginning.
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Hi @seidenh7 ,
One step at a time process of elimination.
Disconnect power from TV and then disconnect mainboard cable from power board, then reconnect the TV power cable to the outlet and switch on power.
Do all the backlights come on and stay on?
If not measure LED voltage at the LED cable connector on the power board.
Very high DC voltage (280 -320V) indicates an open circuit in the LED backlight circuit somewhere.
If backlights stay on, disconnect power from the TV and reconnect mainboard to the power board.
Reconnect power to the TV and switch on the TV.
If no backlights or picture, measure the voltages at the mainboard cable connector on the power board as per values usually written on the power board near the connector and check if they are within specs.
Here's a link to a video that shows how to test if the power board voltages are OK when the power board is not connected to anything and only has the AC supply connected. Not foolproof but just another check.
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Jayeff,
Thanks for the very relevant U Tube video. It's for exactly the model I got.
All the voltages he measured are what I measured.
But then the LED backlight is no longer a problem
since I replaced the leaky Schottky diode at C2, type SF28G.
This is a high failure rate part since it runs hot enough to discolor the PCB.
Recommend doubling it up.
Also replaced all the LED strips since a few LEDs were out.
In the process I might not have handled the display carefully enough.
Now the left half of the display is either stark black or white.
The right half shows video normally.
The two T-Con boards I tried behave somewhat differently but don't help.
Do they have EEPROMs that are resettable?
Tried Mute-182-Pwr to no visible effect.
Hi @seidenh7 ,
When you said that you disconnected the left TCON ribbon and got half a picture my first thoughts were did the other half of the screen stay lit up from the backlights or not and then to see if the power supply was OK and stable and handling the "full" load.
That is why I suggested checking if the backlights stayed on when removing the cable from the mainboard and checking if they came on and stayed on and also the other voltages just to see if the power supply was stable.
Not certain if this link is totally applicable to your model but it has the latest firmware which if you can load (if you can see to load it that is) as it should reset the eeprom.
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