Re: Sony KD-65x8500b - bad Tcon or panel?

Ok, would that test be:
- disconnect ribbon from tcon
- touch ohmmeter leads to adjacent pins on end of ribbon cable
- adjacent pins should not be electrically connected

Or some other test?

Re: Sony KD-65x8500b - bad Tcon or panel?

Whoa! Did a bit more fiddling today. Turned it on, same problem with the bands. But service screen didn’t have bands. Figured it *must* be the Tcon. Turned it off. Reconnected all 4 ribbon cables just in case. Turned it on. Seemed a bit darker. Odd. Turned it off. Redid all 4 cables. Turned it on. Tcon board now emitting a faint buzz, and the picture is fine! Buzz is coming from the end of the board near the TPS ICs.

So, definitely not the panel, yay! Now I’m wondering… is it the Tcon or the ribbon connection?...

Re: Sony KD-65x8500b - bad Tcon or panel?

Hi, thanks for the suggestions. I cleaned the whole board, connectors and ribbon cable ends with isopropyl alcohol, but the image is the same. I don’t have the equipment to solder these tiny components, so I think I will roll the dice and try another Tcon board. Fingers crossed…!

Re: Sony KD-65x8500b - bad Tcon or panel?

Thanks for helping, Here's a pic of the Tcon, and what could be test points. What tests did you have in mind? I have an AC/DC digital multimeter.

Also a pic of one the two square ICs. Hard to read, but maybe it says ‘TPS, 65162, TI 43K, AXIE G4'....

Re: Sony KD-65x8500b - bad Tcon or panel?

Yep, those pics are identical to the TV and Tcon board.

It's an LCD.

A second hand tcon is about $50 including postage (a big factor in getting boards to Oz). I was just wondering if folks could say for sure that bands for each gate driver meant a bad tcon…

Re: Sony KD-65x8500b - bad Tcon or panel?

Here are the pics with each ribbon cable removed (only 1 disconnected at a time). Picture order is top right cable removed, top left removed, bottom left removed, bottom right removed. The banding is visible in pics 1,2; maybe not visible in pic3,4. The image retention is visible in pic3.

Any help greatly appreciated!...

Hi, hoping for some views on this one which I've not come across before. The TV generates an image that has 12 noticeable bands across it. The image is still there and accurate, but the colour (or perhaps the brightness) changes gradually across each band which creates a noticeable 'step change' at the edge of each band. Given it's a 4K TV with 2160 rows of pixels, I'm guessing the 12 bands correspond to 12 gate drivers of 180 rows each. If this guess is right, then perhaps:
a) all the gate drivers are malfunctioning the same way (which seems unlikely), or
b) the Tcon board is malfunctioning,...

Re: New Members - please post your introductions here

Hi, Aussie also. Repairing all sorts of stuff.