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350 Watts ATX ALLIED SMPS Repaired
This Switch Mode Power Supply (SMPS) was brought to me and the complaint was it had a malfunction due to the PC was restarting continuously once and again.
The brand name was ALLIED model AL-C350ATX with the following features:
- Voltage: 115/230 V ~
- Current: 8A/4A
- Frequency: 50/60 Hz
- 350W max.
First step was to take out the upper cover, only four screws.
At simple sight there were some perceptible bulged e-caps in the secondary side of the circuit, let´s see some photos.
Note: Some of the capacitors were spilling out the electrolyte. There were in total 9 defective e-caps.
All of them were substituted for similar ones, let’s see some photos.
The critical components (switching transistors, Rectifier Bridge, big filter capacitors of the primary side, etc.) were checked on with the Digital Multimeter, and all of them were ok.
The SMPS was then put into functioning and see in the photos below the result.
All the output voltages were ok this time, and when the owner of the PC connected the SMPS it worked perfectly fine (no more restarting). One week later I saw him and asked about his PC, and he told me it was working fine.
This article was prepared for you by Humberto Rodriguez, one of our ‘Master Authors’ from Cuba.
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