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The way you're attempting to repair this mb is a sure fire way to kill it. A mb needs to be diagnosed properly before jumping on the hot air gun to replace ic's in a random guess.
PU201 is heating up for a reason. Just measure the resistance to GND on pin5 of this IC-very likely its shorted.
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Mac address is irrevalent for display issue-so you can fix that later.
Forcing LCDVDD wont work if the cable is internally shorted. Its practically not possible to check a display cable for short with multimeter as the cables are twisted in pattern,eg, pin1 on the mb connector may reach say pin12 on lcd side connector.
So you simply cant check it for short. Still strongly advise to replace the display cable first as the readings seems fine without cable on mb side.
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Programming ITE8586E with correct firmware is a must for mb to post. The EC firmware should'nt be an issue.It can be extracted from lenovo bios update by likes of [USER="237374"]SMDFlea[/USER] and other bios masters. You need to get an ec programmer though.
SVOD4 is the best in business.However, this ITE can be programmed with RT8209H via SMBUS interface also.SMDFlea
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Before experimenting with reball,observe the status of 1.8V when core voltage disappears.
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Dont even attempt a reflow without you being able to remove the black glue. Else situation will worsen further. Simplle physics-on heat,element will expand and the glue wont allow it to expand-so will result in damage to SOC.
Removing that glue is a nightmare.Often the PCB pads gets damaged.
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Fuse keeps blowing for a reason. measure resistance to GND on both pads of F1
01.With display cable connected
02.Without display cable connected.
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