Power Supply Repair | Electronics Repair And Technology News

Burnt Mark Found In Essen SMPS Model EPS-240-24 of An Autoclave Machine

Jestine Yong — Sat, 21 Mar 2026 07:17:28 +0000

This SMPS was brought to me in dead condition. On opening and checking the unit, I saw burnt mark near the primary switching SMPS transformer and also found one transistor C3320 short and one Zener diode 33V 1W short. Checked SMPS transformers using the ring tester and found these to be ok. The circuit had […]

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External Universal PWM Switching STR Power Module

Jestine Yong — Sat, 24 May 2025 04:13:59 +0000

While we repair SMPS sometime we don’t find any reference or unavailability of PWM IC , Switching Mosfet .Sometime marking code are also missing from the parts because of burnout or the manufacturer removed marking intentionally. In this situation it is difficult to repair the SMPS. For this type of […]

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How To Test PWM Gate Drive Signal Pulse Using Single Bright LED

Jestine Yong — Sat, 22 Mar 2025 05:46:19 +0000

It is difficult to check PWM IC working in SMPS without Oscilloscope. Came across trick for testing which give us indication if PWM generating Gate drive signal pulse or not. Reference Circuit for SMPS Switching: First of all, remove the mosfet from the Circuit under test & connect the LED […]

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Power Supply With Ticking Sound On The Relay Repaired And Maintained

Jestine Yong — Sat, 21 Sep 2024 09:44:11 +0000

A friend of mine brought this power supply for repair and the moment I powered it up I heard a continues ticking sound coming from the relay so I took it apart and started checking things around that spot. At this moment I had the IC taken out and […]

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Power Supply Strengthening

Jestine Yong — Sat, 20 Jul 2024 03:46:45 +0000

I recently got a second hand EVGA 500-W1 power supply to replace a power supply I did not trust only to discover that the EVGA 500-W1 has a design flaw as discovered when being reviewed It failed under load because the bridge rectifier it uses is only rated for […]

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A Shorted Board In A Power Supplied Repaired

Jestine Yong — Sat, 01 Jun 2024 05:34:24 +0000

An electrician brought this big power supply for repair and seems like he checked with the manufacture about the usual fault in such device so he brought only the main power board of the power supply. Checking the top side of the board I could see a fuse […]

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A Windows Closing/Opening Power Supply Repaired And Maintained

Jestine Yong — Sat, 20 Apr 2024 04:16:55 +0000

A Windows installing technician brought me this dead power supply for repair. The main job of this power supply to provide power to a motor that controls the opening and closing aluminum windows at homes. He said he has many of them for repair but he brought me a […]

The post A Windows Closing/Opening Power Supply Repaired And Maintained first appeared on Electronics Repair And Technology News.

A Dead Power Supply Repaired And Maintained

Jestine Yong — Sat, 11 Nov 2023 23:22:08 +0000

My cousin brought this power supply for repair. He said that this power supply is used to power up an electrical stove and suddenly they heard a popping sound and the stove stopped working. I can see where the popping sound came from and as seen in the photo […]

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A Shorted Power Supply Was Brought Back To Life. Model: CH-600-12

Jestine Yong — Fri, 25 Aug 2023 23:13:25 +0000

A store owner and a friend of mine brought this power supply for repair. He said that it just stopped working for some reason. He wanted it as soon as possible so let the repair begins. This is used to power up LED light strips in his store. He is doing some kind of celebrations […]

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Open SMPS Transformer Hand-Wound In Mobile Charger TC-70

Jestine Yong — Thu, 23 Feb 2023 23:29:26 +0000

For a change, this time it was my own device that became defective. My mobile charger conked off one day and I kept it aside for investigation for a later day. Recently, I just opened the case and checked as to what went wrong. The fuse (a low ohm […]

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