Working on an 820-00850 board that had liquid to UB400, QB631, QB640 and QB630. I replaced all, and board powers up fine, restores fine, but it has one weird quirk that I've not seen before: It will crash and restart at the same exact time every single time--once internet recovery loads. So, the board will power on and sit at the select-wifi-network screen indefinitely. I can select a WiFi network and load Internet Recovery, but the instant it finishes loading and prepares to actually load the language-select screen for internet recovery, it restarts.
Not sure where to start with this one, other than rigging up a way to check various voltages at the moment it cuts out, but I have restored the board several times without issue. It restores successfully every time, and will boot to Internet Recovery fine up to the point of it actually loading and showing on the screen, then the board reboots. Every time.
No damage to the board at all, inspected extremely well.
Any help appreciated; can provide measurements of rails, but will take some finagling to measure at the instant it loads IR.
Not sure where to start with this one, other than rigging up a way to check various voltages at the moment it cuts out, but I have restored the board several times without issue. It restores successfully every time, and will boot to Internet Recovery fine up to the point of it actually loading and showing on the screen, then the board reboots. Every time.
No damage to the board at all, inspected extremely well.
Any help appreciated; can provide measurements of rails, but will take some finagling to measure at the instant it loads IR.
