Electronics > Projects, Designs, and Technical Stuff
Need help with SMPS / MA3810 chip
flolic:
I am trying to repair old Daikin air conditioner inverter board that is damaged by water. It has small SMPS driven by MA3810 chip.
Original chip is fried, and also one power resistor (50 ohm/ 6W) in series with rectifier, on the primary side. I replaced that resistor and put new chip, but
supply is still totally dead. Every other component, and there are only few on the primary side, and few more on the secondary is tested ok.
I can't test the transformer but it looks ok (no shorts between different windings and no breaks). IC gets lukewarm after minute or so.
I connected my scope to the transformer but there is nothing, supply does not even try to start on power on.
I don't have schematics. Datasheet for that MA3810 IC is useless (http://dl.dropbox.com/u/21387397/MA3810.PDF)
I would appreciate any help.
Filip
PeterG:
Any chance of some pics so people can see whats going on?
Regards
flolic:
--- Quote from: PeterG on February 24, 2012, 10:00:29 pm ---Any chance of some pics so people can see whats going on?
--- End quote ---
Sure ;)
This is the whole board, with supply circled in red:
This supply generates voltages for MCU and adjacent circuits (5V/12V), and three separate voltages for compressor opto IGBT drivers.
Close ups:
Bored@Work:
Did C1 shit all over itself?
flolic:
You mean C11? No, that is some kind of glue.
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