Anet a8 Def error ohm reading

[eligri]

Hi!

I just finished building my Anet A8 printer. The first print worked fine, I set it to "cooldown", then unplugged it after a few mins. Now, a few hours later, it will no longer print. Both temps say "def".

I have:
Soldered the heatbed wires on the heatbed
Re-soldered the thermistor on the heatbed

The ohms are as follows: Extruder; 110-120k ohm
Heatbed: 55-59k ohm
(unconnected)

When the heatbed is connected to the mobo, it measures 5.7k ohm. The extruder measures 16-17ohm when connected.

Any suggestions?

Cheers

[eligri]

Just did some more troubleshooting...

Soo, new firmware. Now it shows: 364C extruder, 36C heatbed. The heatbed is a bit too high, but it responds to heat (goes upp to 43C when I hold the thermistor). When I plug the extruder thermistor into the heatbed socket, it shows 24C, and goes upp to 34C when I hold it. Now, to the odd part, the extruder always shows 364C, no matter if it is plugged in or not.

[eligri]

Also, "long" beep when I put the multimeter on both pins on E_T; but not on the others.

[eligri]

Seems like its C47 that is broken, from what I can tell. I assume that is a capacitor? Can I switch it for any capacitor, or do I need a specific one?

[eligri]

I went ahead and bypassed it. Started upp, but now both extruder and heatbed are showing wrong temps.

[eligri]

I dont know how, but new capacitor did the trick. Both temps now working!

THanks for the help!

[eligri]

Stopped working again :/

I have to check, the ones marked in yellow are capacitors, right?

[eligri]

I solved it! Removing both those capacitors, and not bridging, did the trick. Just two blank spots, where I had circled in the picture.

[eligri]

Could that help?

[eligri]

Reflow done. Now extruder says 295C. Maybe less shorting, or something like that? Ill try another reflow now.