Troubleshooting Daikin Inverter PCB Pt1
Troubleshooting Daikin Inverter PCB Pt1
Attempting to find out whats wrong with this board without a schematic.
There is a good possibility that the control supply voltage is supposed to be 110 – 120V and something else is dragging the control voltage down on the inverter board.
They are ‘throw away’ items and I don’t think Daikin publishes repair schematics for them.
Troubleshooting Daikin Inverter PCB Pt1
Troubleshooting Daikin Inverter PCB Pt1
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Arianto
44 Comments
good find ,that will do it. i still would have set fire to it. i hate electronic crap in a/c units.
hah I heard the msn noise and I thought it was mine. I have msn too pm me if you want to add me 😛
you should have kept the other one for parts but you smashed it lol
They are "throw-away" items? They are expensive enough!
the boards all are, its like main boards in copiers or computers, rarely can you repair them, and its usually obvious stuff like blown caps.
that one had the same problem, just intermittent.
the one in this vid has already been dismantled but the inverter and compressor are set aside in case I get bored enough to go back to it.
cool man!
exactly!
lol burning electronics is fun, but since inverters are here to stay I may as well teach myself how to fix them. its tricky without a schematic but you can see voltages marked on the PCB, and its the best place to start.
why does this ac unit have pc bord in it, mine doesnt? coudnt you try bypassing every thin and desighn youre own relay system so you could turn it on using a thermostat?
if yours dosn't have a PCB in it chances are its a standard AC compressor with little more than a starting relay/contactor and capacitor.
without the DC inverter these units won't run.
Looks like the SMPSU for the +5 & +12 is funky. Prob caused by dud secondary electro caps, followed by the IC that runs the SMPSU. I couldn't get a good look but the SMPSU that runs the 5 & 12 looks like it uses a TO-200 case all in one IC. Remove the PCB with the 5 & 12 supply and apply 240Vac to the correct pins – repair it seperate to the main AC board.
sPuDd..
Thanks for the tips man!, bits of IC case or capacitor are indeed harmful to the eyes!
Main reason why I have not gone further is because I'm not sure if the SMPSU is supposed to be receiving 240Vac or 110 from the main AC board.
A working Fujitsu unit I have is all 110AC, and If I were to apply 240vac to the input of the control SMPSU it would blow the crap outa it!
I'm afraid I'll have to try repairing it whilst attached ot the main AC board untill I find a schematic
it is an all-in-one IC, not sure on the case designation, I'll start with the caps, failing that a new IC may be in order!
I'm testing to chassis ground, the PSU is earthed to the AC units chassis too..
I will do a test of the DC 5 and 12V rails to the PCB ground too..
Theres no step down trans, just the ceramic caps and high wattage resisters to limit current and voltage. its been ages since i did VCR PSU's but you are right about the design of the system!.
the fault is on the control board. when I remove the power lead from the main AC board, the voltage on the pins (yellow plug) goes up to 140v AC.
thanks mate!
I figured the control boards were a generic thing for all markets, powered with 110v. and the AC boards were dropped in at the factory to suit the market the unit was being shipped to, I'E 240 to 110 step down for our marked, and no step down for the US market.
I'll pull the board again and go anotehr video at some stage, right now I got other things to tackle.
i thinking this thing of inverter a/c is making repairing of a/c more difficulty , it is not resulting as it should the board will die faster than the compressor & with out a board the compressor can't work
this means when i want to repair my a/c i have to bring it first to a man ho can check the circuit board if not the circuit board i have to bring it to a man who can repair the gas leak or change the compressor.
Nice video !
@sjbrewy I never bothered fixing the unit in the vid, jsut too hard.
I would suggest getting a Daikin tec to look at it. it could be a board in the outdoor unit or indoor.
Spider? Fuck. That. Shit.
If only they could make these inverter boards sealed and fit in 12volts DC fans inside and install heat-sinks i guess the AC would last much longer.. Almost all the damaged Inverter units I have seen is because of moisture and corrosion!!
they come with unit?
Yep – This is why we avoided the inverter A/C units. We bought a generic 30kW non-inverter unit. It's got very little in the way of electronics…..
yep!, I don't touch them now, this one had a short in the IGBT brick or somthing nasty
Ahh.. That's not good… IGBT's are very expensive pieces of silicone.
No way would I install an inverter, until they SEAL the boards in epoxy.
got a problems with a 4mk90 outdoor pcb comp voltage no good can I repair im a refrig mech
Can't you just bypass the board and directly power the fan and compressor to the level you need?
You haven't still got any spare inverter boards for these have you Ed? Need to buy one.
Like your show my friend, i have just ordered a inverter board checker from Carrier, after installing Toshiba 3 phase inverter unit yesterday that would only run the comp for about three seconds. Have you used one of these, inverter board checkers? I will try to post a vid my self once I can work the beast. Ps what part of the Au do you live in, I am a fridgy in Lismore NSW
Hello Aussie, great video. Is there a pt2? My board has a U2 fault and I have discovered the MRM20 and MRM10 relays aren't getting the control 12vdc. When I follow the the circuit it looks like it gets it from the ic on the other board. Where you able to recover the control voltage and if so how? Cheers
I recently replaced a main PCB on a Daikin inverter heat pump, the intelligent power module (ipm1) blew out and had holes in it, severe arcing and smoke :). Ohmed compressor and it was fine, I think snow got inside and got it wet.
you can map the control circuit board of conditioning Daikin not?
Daikin, Acson and York same PCB board spare parts.
hi aussie, is panasonic – CU-XS9RKZ air cons better in hot and humid conditions?
Hey Aussie working on a Turbo Air Inverter Mini Split. I'm getting a P6 error code in the condenser. Any ideas
Hi everyone… where i can to find a guide repair for inverter pcb board?
I have a Celiera ductless system that has gone crazy. turns on or off on it's own. from cooling to heat on it's own. I thought it might be the remote ? NO. I removed the batteries from the remote and it still acts crazy.
Time for a new AC.
somebody need to develop interest make use of time use a tester and check any damage in the p.c board.
OK lots of wise guys……….and the end ???……….NOTHING… what a waste of time…….whats the gain ????
Thanks sir, Add me please your repair helping group… +8801788188133
hindi mein sar
hi i just wanna know if what is the fault of my recently installed daikin inverter REFRIGERANT R32 wall mounted 1.5 tonners indoor model FTKC35QVM .i already finished all the process on installing new acu units like flushing the refrigerant pipe. leak testing ,vacuuming the unit. and release the stored refrigerant from the compressor.,then i terminate the communication wires in the correct tagging,the problem is when i stard the ACU the outdoor unit fan motor was just energizing for 2 to 3 seconds and the compressor doesn't run..i check what is the error code on the remote but it says 00 means normal. but the outdoor unit doesn't run..ill appreciate so much if you can help me.
Dear friend. My 2P960904-1F has 14.9 Volts on 12 V Test pin…Can u help me?