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I replaced U7200 and we have a battery back. Haven't seen that behaviour with a faulty U7200, or maybe I just forgot. Edit: After a few minutes the green/orange light is switching every five or ten seconds. Could this be bad soldering. I looked closely and it seems all the joints are nice...

I see many A1502s with a faulty display cable. Swap it out for one of the many smashed screens' ones and everything works again. Might be the issue you're seeing.

PPBus_G3H = 12.25v

CS laptop needs a new battery, but it can't see any batteries. Board is practically spotless. In diode mode, SDA is 0.196v and SCL is 0.400v . 17/18 and 20/21 of the U7000 measure okay. Measure against a working board, SDA should be about 0.400. We looking at an SMC replacement?

dukefawks the keyboard still works okay. Is it fair to assume the KBC is okay? I'll check the power rail on the power switch shortly.

well, I do have a clean bios binary hand, so flashing it would be easy... I'll do that just to rule it out.

haha. No one is admitting anything Duke, but I assumed that's exactly what happened. Crazy how many shops swap LCDs without disconnecting the battery. Will check on voltages when I get to the office.

Thanks again Paul, handy having someone in my timezone. I've reached out on BadCaps for help, will report back when I get it solved.

Thanks Paul, appreciate the input. The power button for this board is on the MLB itself. This behaviour is present when bench testing with no peripherals attached and the board has no visible corrosion.

I'm not very familiar with PCs and need some help. Asus X555LD. Connect power, board turns on. Turn it off with the power button, and it won't turn on again until you disconnect the power for a few seconds. If the battery is connected, it has to be disconnected too before it wil power back on...

Got this one to work in the end. Please mark solved.

Is anyone else able to clean the ME region on this please? The customer is starting to become a little painful.

Swapped the bios, but same behaviour.

I still have this board in my desk and can't find anything to cause the cycling. Any further suggestions? Could it be a corrupt bios similar to the Air from yesterdays post?

Thanks Duke. https://drive.google.com/file/d/1i6fbK7uKbmnWhwCg9XzbiqawfDcjCpIH/view?usp=sharing Did the firmware just get damaged? Just wondering how that could happen.

So I swapped the bios with a donor, and I get a flashing folder. Can you explain what happened? Corrupt firmware? And how can I detect that in the future? Do I need to clean the ME now? I could read the firmware off the other chip, but if it's damaged, what's the point. I know the serial number.

CPU VCore at L7310 & L7320 is fluctuating but mostly at 0v. Would't it simply be a symptom of the other power rails fluctuating?

Thanks, I hadn't noticed that before. Board behaviour has changed a little over night. Screen does not light up, USB mouse doesn't light up. The fan spins for a few seconds then it dies for a few seconds, then repeats. PPBus : 8.58v PP3v3_s0 = 3.3 (when it's running, drops to 0v) PP3v3_s4 =...

The three fan spin it does when you first connect power again. If you call it something different, let me know. There is no history with this board. Customer said he was using it and it died mid session.

I mean a single beep usually means no ram installed, which is likely power failure to the ram circuit making it /think/ there is no ram installed. This makes me think there is probably a single point that has failed; as opposed to a three ram beep, which means it knows ram is there but faulty...