iphone 7 plus Firstly I proofed a non working vibrator to be a motherboard issue.
C3537 which is off PP_ARC1_VBOOST tested short.
Seeing no discoloration or physical signs of damage on it or any other caps on that line I concluded the speaker Amp that powers the vibrator - U3502 was the most likely candidate. I removed and the short was relieved. So I replaced it with a new one.
Replacement Speaker Amp moved a bit during the reseat so I decided to diode test VDD_MAIN before powering up - dead short. Removed the new speaker amp IC, clean lift and there was no bridging underneath.
VDD_MAIN still dead short. Applied freeze spray, powered up on DCPS and the mosfet was the first thing to get hot - but the mosfet has no path to ground - I don't think it is the cause of the short.
Aside from an audio IC jumper repair I did two months ago there is no prior work, and the phone, excluding the vibrator(which never worked) has been working fine -until now.
Where to?
C3537 which is off PP_ARC1_VBOOST tested short.
Seeing no discoloration or physical signs of damage on it or any other caps on that line I concluded the speaker Amp that powers the vibrator - U3502 was the most likely candidate. I removed and the short was relieved. So I replaced it with a new one.
Replacement Speaker Amp moved a bit during the reseat so I decided to diode test VDD_MAIN before powering up - dead short. Removed the new speaker amp IC, clean lift and there was no bridging underneath.
VDD_MAIN still dead short. Applied freeze spray, powered up on DCPS and the mosfet was the first thing to get hot - but the mosfet has no path to ground - I don't think it is the cause of the short.
Aside from an audio IC jumper repair I did two months ago there is no prior work, and the phone, excluding the vibrator(which never worked) has been working fine -until now.
Where to?
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