Hello
I'm trying to fix a 86inch monitor from LG. It is LG 86ul3e-t
The symptoms are:
- after power on the LG logo blinks for a 1-2 seconds (there is a horizontal line visible for a short while at a top).
- then the screen comes black, but the backlight stays on
I can power it off with a remote control.
I thought that the mainboard was damaged, but I have checked it with another one buyed on auction, and it didn't helped. I have checked also another power board, and even changed all three boards pulled from another 86inch LG TV. Every time the same result - LG logo and black screen.
LCD panel looks fine. LG Logo looks excelent, when it is shown
I tried to checked the backlight LEDs, and all LEDs are fine. With the external tester, each LED circtuit shows 216V DC. When I measure the voltage on the power board, then on the first circuit (left side) I get 215-216V, but on the seond one I see valid result 211-214V. But as I said - all LEDs works.
Does onyone has an idea, what elese may I check?
I'm trying to fix a 86inch monitor from LG. It is LG 86ul3e-t
The symptoms are:
- after power on the LG logo blinks for a 1-2 seconds (there is a horizontal line visible for a short while at a top).
- then the screen comes black, but the backlight stays on
I can power it off with a remote control.
I thought that the mainboard was damaged, but I have checked it with another one buyed on auction, and it didn't helped. I have checked also another power board, and even changed all three boards pulled from another 86inch LG TV. Every time the same result - LG logo and black screen.
LCD panel looks fine. LG Logo looks excelent, when it is shown
I tried to checked the backlight LEDs, and all LEDs are fine. With the external tester, each LED circtuit shows 216V DC. When I measure the voltage on the power board, then on the first circuit (left side) I get 215-216V, but on the seond one I see valid result 211-214V. But as I said - all LEDs works.
Does onyone has an idea, what elese may I check?
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