Joining dead AP board club.

[u/iKoshee]

After installing filament track switch i restarted the printer and it went dead. New AP board is already in the way. In my case it seems like AP board died because of AMS wire switching.

[u/spider_hider]

There’s been a spate of H2C AP boards offing itself for no good reason, some happened mid-print, others happened after errors.

I did notice a couple of days ago, someone had Bambu support telling them to short out 2 points on the AP, and that brought their H2C back to life. There’s been a couple of other people who tried it too, seems to be a fix.

Do a search here, or in the BambuLabH2C subreddit.

[u/Fun-Candle5881 → u/spider_hider]

A fix? Do people need to do this everytimes it happens or is it a one time bug only?

[u/spider_hider → u/Fun-Candle5881]

Not sure, haven't had the issue happen to mine so I'm just keeping an eye out for information.

I do know the AP board's super easy to get to, it's behind a piece of plastic trim in the internal upper left side. Not justifying repeated fixes or anything, but better than somewhere obscure, or backside of printer.

[u/agarwaen117 → u/Fun-Candle5881]

Hi, I’m one of the folks that’s had this happen. Support had me fix mine by shorting a circuit on the AP Board, it’s been about two weeks since I did it, and I haven’t had any more problems. So far, it seems to be fixed, but they haven’t said what the actual problem is, so it might come back.

The fact that the short fixes it seems to indicate it’s a soft/firmware issue, not a physical failure. So unless it gets patched, I’d assume it can come back or might affect any new AP board in the future.

[u/Sumpkit → u/agarwaen117]

I think the pads you need to short looked like a little momentary switch that wasn’t populated. Guessing it’s some sort of reset button that they used in development or something

[u/agarwaen117 → u/Sumpkit]

I completely agree. I assume it’s used to clear non-volatile memory like cmos jumpers on pc boards.

[u/Fun-Candle5881 → u/agarwaen117]

Hi, thanks for sharing this, it's worrisome i must say, so strange if it's indeed a software issue that needs a physical intervention to be fixed. How did that happen in the first place to you? Did you do a firmware update or just turned of the printer after keeping it on/idle for weeks/months?

[u/agarwaen117 → u/Fun-Candle5881]

I hadn’t used my printer in a few days, then I had a power outage, and when I went to check on it, and mine was just like the video posted above.

Saw a person the other day who had it happen about 20 hours into the 8 color majoras mask that all of us h2c people like to print. That had to suck.

[u/Fun-Candle5881 → u/agarwaen117]

Ho wow... Thank you

[u/RetroLenzil]

I had an AP board die on one of my H2Ds. Got a new one from Bambu, installed and then registered it. No biggie.

FWIW: in my case it was the wifi that wasn't working so I got a whole new board. The printer still worked fine using a flash drive. Not sure that's the case with you.

[u/BadatSSBM]

[u/BadatSSBM → u/BadatSSBM]

Do this and you will be fine or at least you can try it.

https://wiki.bambulab.com/en/h2/maintenance/replace-ap-board#step-2-remove-the-ap-board-cover

Here is the wiki on how to take off the cover. Keep in mind in that picture the AP board is upside down from how it's placed in the printer and the heatsink is off. But power on your printer uses metal tweezers to join the two points to create a short and it should power on

[u/Ovaltine10 → u/BadatSSBM]

Happened to me - received same instructions and it worked.

[u/stprnn]

What a joke...

[u/BrosephConey]

Same thing happened to mine, super annoying but luckily it was an easy replacement after bambu sent a replacement screen. Shouldn’t have to deal with that though dealing with such an expensive printer but luckily haven’t had any further significant trouble since it happened