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iMicro SMPS Repaired
I was called by a co-worker because her PC was restarting continuously and a message was shown in Display: Power supply surges detected during the previous power on. ASUS Anti-Surge was triggered to protect system from unstable power supply unit! Press F1 to Run Setup.
This is a bad situation because she could not work. Her PC was an ASUS model P8H61-M LX3 Plus R2.0
Of course first thing done was to disarm the SMPS. The SMPS brand was iMicro and made in China
All the e-caps were tested with the Blue ESR Meter and all were good. Surrounding components also found to be good. It left only one IC that I have not replace.
The part number was SD6109 (Voltage mode PWM Power Supply with built-in supervisor, protection and regulation for PCs).
Now there was need to change this IC and thanks God I had a similar one from another broken SMPS (same brand and same model) with the secondary coil already burnt-see the photo below.
The bad IC was changed with the IC I had removed earlier and when the power was applied, the power supply started to work normally. I have tested it for several days and it was perfectly good.
Note: It is good to keep some bad boards as we can salvage the components
In the next photo you can see some features of this PC and you will realize it was worth to save this PC.
This article was prepared for you by Humberto Rodriguez, one of our ‘Master Authors’ from Cuba.
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