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Nope, not necessarily. You're assuming that. I've seen several instances where a unit will NOT PRAM reset, and the issue was a bad BIOS. I've also seen a million cases where a BIOS prevents a chime at all; or allows a chime but no other boot progress; or a chime and partial boot; or a chime...

That's because you just swapped the chips...you did not load a known-good BIOS with FSYS & $SVS pulled from original file.

Was probably just a bad cable all along. This is an extremely common fault...the odds of this case having identical symptoms but a different solution are slim. Either the replacement cable you tried was also bad (especially if you pulled it from another untested/bad unit), or the "new" or "used"...

Already installed High Sierra APFS update? If SSD has High Sierra and the 3437 doesn't have the APFS (boot ROM ending in .B00) update, and the 00165 does, the 3437 won't "see" it. Check pin out of SSD for 3437 vs. 00165; I feel like someone has asked this before and it did not work.

This seems to have resolved; haven't seen any warnings or anything in 4 or 5 days. Never got any prompts/warnings for any other sites or forums, only this one, but it appears fine now. Haven't changed anything on my end or anything.

If it chimes, it's reaching the BIOS stage. Does it chime and PRAM reset with LCD disconnected by chance? If no physical damage, I'd try a new BIOS. Don't just clean the ME on the same BIOS, use an entirely new BIOS. edited for clarification.

Tried a new BIOS?

Thanks, Aprendiz. If I have ppbus at 13v, does that not eliminate the USB-C drivers? Or could one of the drivers still be bad despite the board powering on (and trackpad clicking)? Display connector and cable both good. This is a board-only sent in to us for repair, so we're using our own test...

OK, I actually found that the trackpad cable was a bit crooked and not completely connected. I re-seated it (it appears to have been replaced at some point), and now the fan is not turning on, and the forcetouch actually works when the unit turns on. Now I just have no video and no light on a...

Working on a 2nd 820-00840 with very similar symptoms, but this one had liquid. -- PPBUS is present at 13v -- ALL_SYS_PWRGD is present at 3.3v -- 3v3_s0 and 5v_s0 both present and proper -- All CPU and memory rails I've checked all appear to be present and correct voltages. -- Board powers on...

Working on the first non-liquid A1708 820-00840 unit I've seen yet. This one powers on (no charger noise), no chime (normal), no video/backlight, and fan ramps up to full speed gradually. Inspected board completed, no liquid anywhere. Tried a new BIOS to be sure, and same behavior. I'll start...

Not sure if anyone else is experiencing this, but occasionally when I visit the forums, I get a forward-URL and a warning about a "deceptive site" ahead. I didn't note the name/URL, but will do so next time it happens and update this thread. Hasn't ever happened previously, and only started...

Just replace trackpad cable already. The keyboard isn't working because the trackpad cable is bad. Also possible the trackpad itself is bad, but super unlikely.

Duke, any returns on the test units you sent out? I have ~5 out there now (1 00138, 1 00163, 3 3662), no returns yet, fingers crossed. Have also seen a few boards recently where someone tried to replace the chips themselves, but did a piss poor job and killed the CPU. Bummer. edit: By the way...

Thank you; I removed C6500 and there was no change. Left-channel headphones still extremely low-volumed. Any other ideas? Thanks again for all help!

Internal speakers (left and right) work fine, not muffled at all. The only issue is the left headphone not having full volume--it does work, just very, very low volume (~10%). It's very similar to when an amp blows/fails, how you can still hear the volume, but it's super low. I hope that makes...

Working on an 820-3330 that has a headphone issue; the left channel only is very muffled/restricted, as if it's not being boosted/amplified properly. It's at around 10% of normal proper volume. Right channel works great. 1. Already replaced jack. 2. Replaced U6201, as it had seen liquid. 3...

Same here. It's funny, because not only do people think that having expensive tools will make the work "easy", but they also try to haggle on repair costs because they also think it's easy, even though they have the expensive equipment! Hilarious. Do you guys charge more for tampered boards, or...

Oh I agree 100%, definitely, no doubt about it; I edited my last post since the point the OP is making is very clearly about not selling repair service if you can't do it properly (for a second, I thought this was another "look how fucked up this is" thread, and wasn't quite impressed, lol). I...

You have to start somewhere, and a lot of people get very eager to "make money" once they perform one successful repair. It's just the nature of the business; it's much more appealing to a shop/board owner to save $100.00-300.00 on board repair costs and attempt to do it themselves (knowing that...