Lenovo Thinkpad R61 video chip issue.

[primoz1]

I got one problem, I try lift the GPU chip (nvidia) from this board, but this lenovo boards is a little tricky, becouse the epoxy is put under the chip in all corners, (look red marks on attachet picture) this is not red epoxy but some transparent sh** and no way to lift the chip, maybe if I use tweezers and force, but Im afraid I would pull out some pins from board or chip.

I look this video on youtube but Im a little skeptical that this is the right way to lift this chip, too much force and board movement.

Is any sugesstions how resolve this problem ?

Thankyou.

[lord]

Re: Lenovo Thinkpad R61 video chip issue.

I manage to lift the chip, well heated with a little bit of force, but just little.
Now I'm having trouble cleaning the epoxy of the chip.
Will get back with feedback!

[primoz1]

Re: Lenovo Thinkpad R61 video chip issue.

Ojoj. This transparent epoxy is pain in the ass

I put flux and with soldering iron (knife tip) first gentle remove this layer of epoxy, you will see is not hard, but is messy-dirty. Until I not clean at least 80% epoxy from board or chip (then clean chip-board and put new flux) I not work with solder wick wire.

[lord]

Re: Lenovo Thinkpad R61 video chip issue.

How do you then remove rest of the solder on the pins of the chip ant the board if not with wick wire?

[primoz1]

Re: Lenovo Thinkpad R61 video chip issue.

You are not well understood, before I got epoxy not use wire as it just gets stuck, first take off the epoxy to at least 80% then you just use it well wire.

Nisi dobro razumio, dok ne skinem enaj epoxy ne koristim žicu, jer samo zapinje, prvo skineš epoxy do barem 80% onda tek upotrebiš žicu.
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[lord]

Re: Lenovo Thinkpad R61 video chip issue.

Yes, ok. I now see, i missed the "until"

IN the meantime i tried to remove that epoxy by heating it with hot air, and removing it with knife, but i overheated it (the chip has bubbles )

[primoz1]

Re: Lenovo Thinkpad R61 video chip issue.

Ajajaj my condolences

[lord]

Re: Lenovo Thinkpad R61 video chip issue.

I must order a new one G86-740-A2.