TAB Driver IC Repairs

[Teflonbandit]

I am playing around with learning how to bond tabs back to the LCD panels but wanted to share something unique.
These Malaysian guys heated the driver IC chip on film. The FPC stays in place and they heat the chip to repair. Then slather it with heat dissipate paste. I am going to have to try this on a bad panel when I pick another one up.
https://www.youtube.com/watch?v=4iECBt8UxZg
Anyone have a bad panel they want to play with and see if this fixes it. The bad panels I have are stripped of parts for salvage so I won't be trying it soon.

[dick_barton]

Re: TAB Driver IC Repairs

Interesting. Nothing to lose trying it if you have this fault.

[budm]

Re: TAB Driver IC Repairs

I cannot see if the IC is bad I.E. shorted out can be repair by heating it without replacing it. If heat can fix bad IC then there is no need for me to stock replacement IC.

[Alastair E]

Re: TAB Driver IC Repairs

Its prob the bonding of the chip to the FPC rather than a dead chip....

Worth a try, will give it a go. the guy also has other vids--like curing the double-image fault by cutting some traces....

[dick_barton]

Re: TAB Driver IC Repairs

+1
It appears to be re-bonding the COF chip. If the chip has blown then there's nothing at the moment that I am aware of that can be done.

[jjanssen7]

Re: TAB Driver IC Repairs

I've played with this a few times with no success, but I wonder if that's because I was working with shorted IC's and not poorly connected ones.

In the video, upon powerup his TV displays normally (very briefly) then goes to screen fault. I think that's a clue the IC's not shorted, just not making proper connection.

[Teflonbandit]

Re: TAB Driver IC Repairs

budm
I was thinking the same thing. I don't think you can bring one back from the dead. I was thinking along the lines that the bond was weak to the fpc. But it is a very curious video. I have never seen someone try this before.

[Moreno83]

Re: TAB Driver IC Repairs

Ok i didn't expect that haha. Makes sense though as that chip runs very hot. Will try it if i find a tv with a bad panel..... <-- That won't be hard

[tibimakai]

Re: TAB Driver IC Repairs

That is interesting.
If the IC is shorted, then there is a black screen on that side, no?

[Teflonbandit]

Re: TAB Driver IC Repairs

Tibimakai
It all depends on panel and driver. Some failures look like rainbow stripes while others are dark and some can be blank. Depends on how the chip failed. Sometimes the get so hot they melt through the fpc.

[budm]

Re: TAB Driver IC Repairs

Well the heat cannot fix the chip failure, it MAY fix the bad connection between the chip pins and the flexible PCB.

[Th3_uN1Qu3]

Re: TAB Driver IC Repairs

Hardly anything new. You can buy wide tips, "T-tips" for your soldering iron which make this kind of job easier. On ebay they are popular as "soldering iron tip BMW" - apparently a lot of BMW head units and instrument clusters have issues with the tape connection to the display.