AMD RS880M/HD4250 (216-0752001) - bad chip!
I think we have the new Geforce 6150 with this one, got 3 laptops with the same issue in a row, with this same chipset, AMD RS880M.
#1. HP 625. Been previously reballled ~9 months ago, failed in the same way. No video and 2 blinks of caps lock. Noticed that a capacitor was missing on top of the chip and another one was just hanging off the edge of the pads.
Took the chip off and found oxidized pads on the board. Also on this particular board the pads on the outside of the chip are very very small, no wonder it gets unsoldered. Added the missing cap, reballed again and soldered back to the board. Working fine.
#2. MSI CR610. Hadn't been repaired before. Had graphics corruption and then the owner reinstalled Windows 7. Booted Windows without a video driver, but would not even boot into Safe Mode once the driver was installed.
Obvious overheating marks on the backside of the board where the chipset is, and on the substrate of the chip itself. Took the chip off, same overheating marks on the board under the chip, and on the contact side of the BGA. Attempted reball, came out perfectly but the chip didn't make it. Currently it lights up but no video at all, found a dead short on 2 of the little ceramic caps on the chip. Currently waiting for a new chip to arrive, i found a supplier of chips already reballed with lead, so it should work fine then.
#3. HP G62. No video, no previous repairs. Heatsink clogged with dust. Reflowed GPU (HD4550) and it came up, worked for 1 day then died again.
Noticed that the HDD led does not light up indicating the system does not boot at all, so this was actually NOT a GPU issue, but a NB one instead. It likely started up because some heat reached the NB as well. Will reflow the NB too and hopefully it'll work.
Just a heads up for everybody, it seems like this RS880M chip has issues, and replacement is the recommended solution.
#1. HP 625. Been previously reballled ~9 months ago, failed in the same way. No video and 2 blinks of caps lock. Noticed that a capacitor was missing on top of the chip and another one was just hanging off the edge of the pads.
Took the chip off and found oxidized pads on the board. Also on this particular board the pads on the outside of the chip are very very small, no wonder it gets unsoldered. Added the missing cap, reballed again and soldered back to the board. Working fine.
#2. MSI CR610. Hadn't been repaired before. Had graphics corruption and then the owner reinstalled Windows 7. Booted Windows without a video driver, but would not even boot into Safe Mode once the driver was installed.
Obvious overheating marks on the backside of the board where the chipset is, and on the substrate of the chip itself. Took the chip off, same overheating marks on the board under the chip, and on the contact side of the BGA. Attempted reball, came out perfectly but the chip didn't make it. Currently it lights up but no video at all, found a dead short on 2 of the little ceramic caps on the chip. Currently waiting for a new chip to arrive, i found a supplier of chips already reballed with lead, so it should work fine then.
#3. HP G62. No video, no previous repairs. Heatsink clogged with dust. Reflowed GPU (HD4550) and it came up, worked for 1 day then died again.
Noticed that the HDD led does not light up indicating the system does not boot at all, so this was actually NOT a GPU issue, but a NB one instead. It likely started up because some heat reached the NB as well. Will reflow the NB too and hopefully it'll work.
Just a heads up for everybody, it seems like this RS880M chip has issues, and replacement is the recommended solution.
The original chipset is noticeably browned due to overheating. Pics to follow tomorrow when i solder it to the board.
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