Blue Ring Tester Goes Packing Up
This my blue ring tester stop functioning, so I decided to take it for checks. I did wonder why it pack up after a few years of use, for the fact I hardly use it, we all know we don’t frequently use it as other tools.
So open it, having unscrew the screws at the back, tested all components on board…all tested good, so my suspicion is on the two ic, (CD4015 and CD4069).
I then desoldered the two ic off board and replaced them with new ones.
Then I try it to test smps transformer and it did work, but not effectively as before, perhaps because the replacement ics are not as good quality as the original ones, I purchased the replacement from a local shop.
This the finished repair work.
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 Cutting Modification On LG LED TV
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Tayo
December 13, 2025 at 2:12 pm
Amazing coincidence... I also thought about my Blue Ring Tester. I thought about how I never really use it!
Parasuraman S
December 13, 2025 at 3:43 pm
Good to know you could fix this rarely used but important tool! Many thanks for sharing! I too have a similar tool that of ESR bought from Jestine Yong!
Albert van Bemmelen
December 13, 2025 at 6:27 pm
You didn't test the old CD4015 and CD4069 cmos chips Imoudi?
Most new China bought cmos/ttl replacements may test bad in my good ic testers. Such as the 74HC4060 that give false measured frequencies as result in the Elektor Crystal Tester v2.0 when quarts crystals below a certain frequency of around 12MHz are tested. Also all 25 China received CD4045AE 21-stage ripple counter/divider ic's failed pass1 in Evie Solomon's retro chiptester. But only because a certain crystal pinout function in this chip that failed was probably not used in the 40-year-old-telenorma-station-clock-controller they still could be used in my friends device. Which you may know was fixed and documented in the 40 year old telenorma-station-clock-controller-device article on Jestine's blog.