Hello. I have a lenovo that will not show any indication of life. No led, sound or anything really. So I took the motherboard out and started testing points according to the advice in this thread: https://www.badcaps.net/forum/showthread.php?t=102409
PU201 is Showing 6v
VREG3/5 show a high value (around 20v) for a split second then drop down very quickly. Hold around 1v but then continue to drop to zero. One is showing .2v.
Fuse PF1 is showing very low voltage (which according to the thread deals with docking and is expected)
Fuse PF2 shows 20v.
I don't have a bench power supply and good way of checking thermals so I did something I've seen on indian repair channels on youtube. I put my individual finger tips spread out over several different ICs until I found one that burned me.
It was a chip that reads "Lenovo bd4179 826 h69"
Googling that I found one from china for $5. I'm not sure if this is the offending component. It didn't actually burn me, but it is uncomfortably hot and I wouldn't want to leave my finger on it. If I did have a thermal cam it would no doubt light up.
What do you guys think? Are there other test points I should check to zone in on this and verify it before ordering the chip from China? If this chip is what failed did it probably wipe out other components as well that I need to order or is the damage typically sustained to just this ic?
PU201 is Showing 6v
VREG3/5 show a high value (around 20v) for a split second then drop down very quickly. Hold around 1v but then continue to drop to zero. One is showing .2v.
Fuse PF1 is showing very low voltage (which according to the thread deals with docking and is expected)
Fuse PF2 shows 20v.
I don't have a bench power supply and good way of checking thermals so I did something I've seen on indian repair channels on youtube. I put my individual finger tips spread out over several different ICs until I found one that burned me.
It was a chip that reads "Lenovo bd4179 826 h69"
Googling that I found one from china for $5. I'm not sure if this is the offending component. It didn't actually burn me, but it is uncomfortably hot and I wouldn't want to leave my finger on it. If I did have a thermal cam it would no doubt light up.
What do you guys think? Are there other test points I should check to zone in on this and verify it before ordering the chip from China? If this chip is what failed did it probably wipe out other components as well that I need to order or is the damage typically sustained to just this ic?
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