Panasonic tnpa5336 buffer board upper sent in for repair

[ricosavy]

I sent in this board to get repaired and was told it was not repairable.This is the reponse i got does this make sense.
The item referenced above was sent to our Repair and Return program. Upon evaluation of your part by our Technical team, we have determined your part is Beyond Economical Repair and cannot be serviced. The technician notes on this order was corrosion on connector SU3 etching is gone.

You will not be charged for services rendered on your order, and we can properly dispose of this board for you at no additional charge. Please respond with your preferred disposition. I asked why and if they tried to repair it and how much would it cost to ship it back.They responded,
Yes, the tech replaced 2 IC's and that was when we discovered the corrosion that had gotten into the internal trace etching of the board. These etchings are the copper trace's on the board that connect the components. Your board actually has these trace's that are in between different layers of the board and the corrosion has gotten into these. We can detect this corrosion but are unable to repair it. We do not charge for an order if they are unable to complete the repair even if we have parts and labor in it. There is no cost to ship it back to you. Thank you and have a great day. As far as i can tell there was no corrosion.Is this just an excuse for saying we messed up your board or does it make sense.

[CapLeaker]

Re: Panasonic tnpa5336 buffer board upper sent in for repair

I guess the only way to find out is to get the board back and see what happened.

[tw2005]

Re: Panasonic tnpa5336 buffer board upper sent in for repair

I would say that the IC replacement was harder than expected and potentially a trace has been torn. I've had a quick go and those IC s are glued down pretty well with that heat sinking sealant and the traces lift real easy . panasonic deems these non repairable.

Don't think I'd hold a grudge, no fix, no charge and the board was dead anyway.

I guess these are impossible to find hence the repair attempt?

[ricosavy]

Re: Panasonic tnpa5336 buffer board upper sent in for repair

That is what i was thinking too that trace probably got lifted.like you said those ic chips are glued down pretty good.I also tried to remove one and burned the traces trying to get it off i that there was solder under the ic.Once i took it off there was no solder just glue and it was holding chip pretty good.the rest of the ic's became pratice ones came close to getting them off with no damage but was no success.I just wanted to see if it was if the corrosion was just excuse i will post picture of the failed repair attempt once i get the board.Here is a picture of my attempt missing pads.

[tom66]

Re: Panasonic tnpa5336 buffer board upper sent in for repair

The one pad you lifted off is not electrically connected, so it should be ok to have put the new IC on like that. I am surprised to see the bottom pad is not connected, I had always thought it was. Maybe different depending on the IC.

[tw2005]

Re: Panasonic tnpa5336 buffer board upper sent in for repair

The one pad you lifted off is not electrically connected, so it should be ok to have put the new IC on like that. I am surprised to see the bottom pad is not connected, I had always thought it was. Maybe different depending on the IC.

I experimented with a dead board and there were no soldered lands in the centre but a whole lot of thermal sealant holding the chip down on a buffer from my 2010 TV .