Finding shorts can be a pain. Before assuming it is CPU related, you have to rule out everything else. Now you could have two separate shorts/issues, especially on a water damaged device but there could also be a common failure point.
Start with PP1V1 as it is a bit easier to follow. It is generated by the PMIC, feeds into the CPU and Acorn. PP1V1 is always used as a supply for downstream PMIC LDO outputs so you’ll want to check all of the PMIC LDO’s that are lower than 1.1V as they may be pulling down the line indirectly.
PP1V8 is used more widely but you essentially have to do the same thing. Find the starting point (PMIC) and follow it through. It could be a cap or it could be an IC so you have to rule things out one at a time. Use the visible water damage as clues but sometimes there are no visibly obvious clues to the failure. Freeze spray or Thermal camera may help if the short is giving off heat.
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Need more info. What are the readings you are getting on these lines? Is the short on the top half of the board or the bottom half?
crwdns2934271:0crwdnd2934271:0 Chris Stables crwdne2934271:0
upper layer, where the cpu is situated
crwdns2934271:0crwdnd2934271:0 Francesco crwdne2934271:0
Have you removed the two audio ic”s U4902 and U5002 yet? They would be the first things I would remove.
crwdns2934271:0crwdnd2934271:0 Chris Stables crwdne2934271:0
no, will try, thx so much, which one of those 2 lines is connected to the audio ic?
crwdns2934271:0crwdnd2934271:0 Francesco crwdne2934271:0
@imicrosoldering hello, IC U4700 was found to be shorted, could removing that fix also the short on PP1V1?
crwdns2934271:0crwdnd2934271:0 Francesco crwdne2934271:0
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