Hey guys.
I've acquired a PB180 which unfortunately suffers from the 'tunnel vision' problem. After a few minutes of use, the shadows appear at the edge of the screen growing to leave a visible circle in the center.
I couldn't find much about this via google. I was hoping it would be bad caps somewhere but there is speculation ranging from moisture damage to the LCD to failure of the crystals themselves. Temporary fixes include extreme heat or extreme cold. I don't think it's moisture as the effect is too uniform.
Does anyone have any ideas what the problem might be? I've not opened the screen up yet but I do have a PB170 active matrix screen on hand and there are no obvious components that could fail the PCB (caps etc). Just custom ICs.
I've acquired a PB180 which unfortunately suffers from the 'tunnel vision' problem. After a few minutes of use, the shadows appear at the edge of the screen growing to leave a visible circle in the center.
I couldn't find much about this via google. I was hoping it would be bad caps somewhere but there is speculation ranging from moisture damage to the LCD to failure of the crystals themselves. Temporary fixes include extreme heat or extreme cold. I don't think it's moisture as the effect is too uniform.
Does anyone have any ideas what the problem might be? I've not opened the screen up yet but I do have a PB170 active matrix screen on hand and there are no obvious components that could fail the PCB (caps etc). Just custom ICs.