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5 KW Domestic Stabiliser Repair

By Jestine Yong on March 15, 2025

This domestic stabiliser was brought to me with complaints of shutting down once its connected to load after few minutes. The customer said he uses it to power his water purifier machine, he produces sachet drinking water for sales.

So I connected it to a/c wall socket and plug in 100 watt bulb, on switch, bulb lit.

So I assumed it to be a small problem, I removed metal cover and observed the single board, to my surprise a couple of components are rusted and there are dry joints.

The following components are rusted, they tested good though: variable resistors 5 kohms (5), 1815 transistors (11), led bulbs (5), 7mm×7mm switch (2).

Having replaced all these, I carried out esr of all e- caps on board…..all good. Then did patching of all dry joints mostly pins of e- caps and color band resistors.

how to fix and repair voltage stabilizer

NOTE : When repairing domestic stabiliser, always check the polarity of led bulbs marks on board and compare with anode and cathode of bulb before desoldering bad bulb out. In this case two bulbs were marked wrongly.

Then reassembled device and tested it with 1.5h window air-conditioning device and it worked perfectly. Called owner for collection. Pictures below explain more of finished repair work.

how to fix a broken 5kw voltage stabuilizer

This article was prepared for you by Imoudu Onwumah from Nigeria. He is 62 years old and has just 3 years experience in electronics repairs. I started career in hotel industry as a chef, but then I was doing repairs only in electrical repairs as a hobbyist. In 2018, I decided to learn about electronics which through Jestine’s electronics e-books and holding my hand, am an electronics techie today.

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Note: You can read his previous article on How To Fix A Rechargeable Fan

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Voltage Stabilizer Repair

5 Comments

Albert van Bemmelen

March 15, 2025 at 5:28 pm

Those potentiometers sure looked very rusty! Interesting to see that all eleven 1815 transistors although good but also rusted were replaced too. I suppose that chances are that the replacement parts start to get rusty too because of the water purifier machine it is used for to power it.

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Parasuraman S

March 15, 2025 at 5:50 pm

My jaws dropped after reading the article, as it was an amazing repair work carried out by you to save the device from dump! Very meticulously combed and corrected all problems! Well done, dear Imoudu! Many thanks for sharing!

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Waleed Rishmawi

March 15, 2025 at 8:27 pm

Very interesting article and I am glad it worked out fine. That is a lot of rust in there. Thanks for sharing

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YOGESH PANCHAL

March 16, 2025 at 12:44 am

Imoudu,
Good patience & effort to fulfill the job,Excellent!

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Mark J

March 16, 2025 at 2:30 am

Onwumah good job on the repair. I never worked on one of those before.

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