ACER XV340CK 34" black screen

[seve91]

Hi everyone,
I got this monitor with black screen problem.
I thought the problem was in the motherboard, so I bought 2 smashed monitor same model to disassemble boards and swap them, but same issue remains.
After some tries I've found out that connecting LVDS cable on-fly after powering on the LCD panel let me see the whole screen for half sec, then goes black again.
TCON got two output flats, because each flat goes to a tiny board with some COF, each tiny board manages half LCD panel.
I discover that if I leave connected only right side (right flat of the TCON), the monitor works perfectly.
As soon as I connect the left board (left flat of TCON) the monitor goes black, and then got no voltages even on the working right side.
Looks like TCON goes in protection due to a short, but I didn't found any short on the left tiny board, also COF looks ok.

COF flat is marked NOVATEK NT66956H-C12V2A, COF chip is market OTBOT52C.
Left tiny board is marked MV340VWB-N20, TCON is marked MV340VWB-N20-DDP0

Any advice guys?
Thanks

[StefanNg]

Tape the left flat ribbon. You either have to identify which pins are the clock signal or you do it trial and error.
But it might not last long if the right side also become short.
My last panel fixed only lasted for 2 months. It is luck to have it fixed.

[seve91]

Tape the left flat ribbon. You either have to identify which pins are the clock signal or you do it trial and error.
But it might not last long if the right side also become short.
My last panel fixed only lasted for 2 months. It is luck to have it fixed.

Thanks for your reply.
Yes, you're right.
Each board got 6 COF, I've desoldered the last one of the left board and the LCD started, but without last row of the screen.
Then I resoldered the ribbon again but black screen came up again, so the COF is burnt.
Tried to reflow it without success.
Don't have any test point on the COF, no datasheet, so I'm very sorry but I'll bin everything