I am trying to repair an LG split AC indoor unit, which does not start and gives a CH05 error code.
This indicates an error in the communication between the outdoor and the indoor unit.
The outdoor unit is fine, so the problem is the indoor PCB.
The indoor unit is an LG PC09SQ NSJ (3SNM09JA2FA), and the PCB has the following type number:[B] EAX35907219-1.2 [/B](see photo1)
I changed optocouplers ICO1X & ICO2X and the NPN transistor S9013 which drives optocoupler ICO2X (see photo2), but this did not remedy the fault.
Does anybody have the schematics of this...
ngml
New Member
Last Activity: 02-03-2025, 01:16 PM
Joined: 08-22-2020
Location: Limburg
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Hi,
I studied electronics in the beginning of the 80'ts, but never worked in this industry.
Somehow ended up in the oil & gas sector, and after retirement I picked-up electronics as a hobby.
So much to learn, and to catch up, which is not easy when the brain starts slowing down
But it is all about having fun, and taking care of not to get electrocuted
...
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