Ik vermoed dat ik het daar ook zoeken moet.
Neem aan dat een nwe ic er in zetten niet de oplossing is.
Had nog een andere print van een gesloopte maar dat is een totaal andere print.
Sorry for returning to this topic to late guys. I specially registered for this here. Just wanted to ask, did you able to resolve the problem with AC? I'm from Italy, and we have this condicioner as Argo Nuk, but as I understood, it's exactly the same model.
Anyway, I have the same problem as you described here. I tried to check what could be the reason, and the only thing which I noticed that at the input of 7805 stabilizier, during turn on the voltage drop from 12V to aroung 8-9V. Output of the 12V stabilizier instead is stable 12V constantly.
Also I found that on aliexpress they selling these PCBs, but with the cost of delivery it takes around 60-70€, not sure that it make sense to buy.
Anyway, I'm open to any suggestions or advices. Thank you everyone in advance.
testman
waar rook was, werkt nu iets niet meer
that could be part of the problem then, an 78XX regulator needs more than 3V above the regulating voltage to work properly. 8V is not enough en could make the pic to couse errors. as i read its the moment that the compressor comes in that the voltage drops? dan try another outlet becouse it sounds as the main voltage drops to much by the current of the compressor.
also the yellow capacitor could be the problem, this makes the low voltage on whitch the circuit runs. replacing that could be all..
Well, I don't think so that it is still actual for someone, but I hope later it'll be useful for someone else in the future.
Looks like I finally resolved the problem with that AC.
Seems the problem was with the relay which was turning on the compressor. I found that when the relay was turned on, an arc appeared on its power part, which was visible even through its case. I think this was the reason why the microcontroller went into reboot.
Before I also tested all electrolytic capacitors with ESR tester, there was nothing criminal, but I decided also to replace them all, just in case, luckily I had all similar nominals at home.