I came across an inverter board from an LG ASUW1865DH0 outside unit.
Someone tried to repair it but failed.
It shown some manual soldering marks around the graetz bridges and the PFC IGBT but all looked good.
The unit had a nice looking scheme in the cover of the wiring connectors:
By looking it more closely I realized that I have not disassembled the PFC Reactor coil out from the unit. Unfortunately starting the power supplies was not possible without it.
Shorting the reactor coil would likely kill the PFC IGBT, however I have not too much mood to climb up and disassemble the coil.
So I started to look after some old PC power supplies for a salvagable PFC coil, but I failed to find one even by looking around at several friends with similar interests. I have had salvaged a PFC coil 15-20 years ago, but at some point discarded it.
Anyway one of my friends recommended that I could simply block the gate of the PFC IGBT from being driven and the power rails should came up.
I did exactly this, and the DC link nicely went up. However no voltages were present on the low voltage side.
The low voltage rails were powered by this module:
The board is very nicely equipped with silkscreen: we know that the low voltage rails is 15V. I looked around for schematics of the board, however it does not seems to be exists in the wild.
I started to look for the 1515752 power module ID and in many places it was sold with URM1515-2B RM1515-2B PM1512-C2 UPM1512-C2.
By looking up these partnumbers I managed to find an LG service manual which contained this schematic:
Aha, this is not a transformer but a complete SPMS potted into a transformer shape.
The schematic power part very closely matches what I have.
I could not resist to take apart the module. With some hot air gun I managed to dig out the PCB.
Unfortunately the some coil windings got damaged, so reparing it is out of question.
The module uses a different SPMS IC: TNY266 which is a lower power rated than the TNY268 which is in the uRM1515-2B.
The board/module has markings Tamura 4P-P1-10465C
After looking about the Tamura corporation they website has a very similarly looking module called EPM:
https://www.tamuracorp.com/electronics/en/powermodule/
[ hozzászólás ] [ 0 trackbackek ] permalink Someone tried to repair it but failed.
It shown some manual soldering marks around the graetz bridges and the PFC IGBT but all looked good.
The unit had a nice looking scheme in the cover of the wiring connectors:
By looking it more closely I realized that I have not disassembled the PFC Reactor coil out from the unit. Unfortunately starting the power supplies was not possible without it.
Shorting the reactor coil would likely kill the PFC IGBT, however I have not too much mood to climb up and disassemble the coil.
So I started to look after some old PC power supplies for a salvagable PFC coil, but I failed to find one even by looking around at several friends with similar interests. I have had salvaged a PFC coil 15-20 years ago, but at some point discarded it.
Anyway one of my friends recommended that I could simply block the gate of the PFC IGBT from being driven and the power rails should came up.
I did exactly this, and the DC link nicely went up. However no voltages were present on the low voltage side.
The low voltage rails were powered by this module:
The board is very nicely equipped with silkscreen: we know that the low voltage rails is 15V. I looked around for schematics of the board, however it does not seems to be exists in the wild.
I started to look for the 1515752 power module ID and in many places it was sold with URM1515-2B RM1515-2B PM1512-C2 UPM1512-C2.
By looking up these partnumbers I managed to find an LG service manual which contained this schematic:
Aha, this is not a transformer but a complete SPMS potted into a transformer shape.
The schematic power part very closely matches what I have.
I could not resist to take apart the module. With some hot air gun I managed to dig out the PCB.
Unfortunately the some coil windings got damaged, so reparing it is out of question.
The module uses a different SPMS IC: TNY266 which is a lower power rated than the TNY268 which is in the uRM1515-2B.
The board/module has markings Tamura 4P-P1-10465C
After looking about the Tamura corporation they website has a very similarly looking module called EPM:
https://www.tamuracorp.com/electronics/en/powermodule/
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