Comments on: Servicing Mercury SMPS  KOB AP4400XA https://jestineyong.com/servicing-mercury-smps-kob-ap4400xa/ Semiconductors, Test Equipments, Circuit Board Troubleshooting, Electronic Repair Courses and Many More! Wed, 24 Jul 2019 18:15:35 +0000 hourly 1 https://wordpress.org/?v=5.4.19 By: KYBOSH https://jestineyong.com/servicing-mercury-smps-kob-ap4400xa/comment-page-1/#comment-360583 Wed, 24 Jul 2019 18:15:35 +0000 https://jestineyong.com/?p=19002#comment-360583 In reply to Bob Lamparter.

Wow...ATF??? That's the first Ive heard of that one.
Anything, other than personal experience, to back this claim up?
(Trust but verify)

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]]> By: Robert Calk Jr. https://jestineyong.com/servicing-mercury-smps-kob-ap4400xa/comment-page-1/#comment-352991 Fri, 08 Mar 2019 05:10:38 +0000 https://jestineyong.com/?p=19002#comment-352991 In reply to Parasuraman S.

Hi Parasuraman. I could not find it in any of Mr. Yong's books where he advises mixing WD-40 with old nasty hard grease. Do you know what page it is on?

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]]> By: Robert Calk Jr. https://jestineyong.com/servicing-mercury-smps-kob-ap4400xa/comment-page-1/#comment-352960 Thu, 07 Mar 2019 05:38:37 +0000 https://jestineyong.com/?p=19002#comment-352960 In reply to Humberto.

All you have to do is google it and nearly every article says that WD40 is not a good lubricant. Even Popular Mechanics dispels the myth. It has some good uses but lubrication is not one of them.

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]]> By: Humberto https://jestineyong.com/servicing-mercury-smps-kob-ap4400xa/comment-page-1/#comment-352933 Wed, 06 Mar 2019 14:53:37 +0000 https://jestineyong.com/?p=19002#comment-352933 Great repair Parasuraman. Mr. Jestine Yong sells a great e-book about repairing SMPS, including PCs SMPS.

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]]> By: Humberto https://jestineyong.com/servicing-mercury-smps-kob-ap4400xa/comment-page-1/#comment-352932 Wed, 06 Mar 2019 14:51:19 +0000 https://jestineyong.com/?p=19002#comment-352932 In reply to Robert Calk Jr..

WD-40 is dielectric too, a good feature in my opinion

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]]> By: Robert Calk Jr. https://jestineyong.com/servicing-mercury-smps-kob-ap4400xa/comment-page-1/#comment-352869 Mon, 04 Mar 2019 09:20:10 +0000 https://jestineyong.com/?p=19002#comment-352869 In reply to Parasuraman S.

A decent quality lithium grease should work. I use white lithium grease by Permatex, nothing special. I am on my laptop several hours a day and the fans in my Targus Chill Mat that I serviced are still running great and whisper quiet.

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]]> By: Parasuraman S https://jestineyong.com/servicing-mercury-smps-kob-ap4400xa/comment-page-1/#comment-352837 Sun, 03 Mar 2019 09:51:50 +0000 https://jestineyong.com/?p=19002#comment-352837 In reply to Robert Calk Jr..

It depends on availability of the type of grease used in the fan. Such grease is not available in electronic shops here in this area. I have been using WD40 for quite some years. I have found its use very good and no complaints received afterwards. Perhaps, the formula used here might be different!

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]]> By: Bob Lamparter https://jestineyong.com/servicing-mercury-smps-kob-ap4400xa/comment-page-1/#comment-352821 Sat, 02 Mar 2019 20:29:03 +0000 https://jestineyong.com/?p=19002#comment-352821 I'm also in the do not use WD-40 camp. Unless WD-40 is formulated differently in SE Asia than it is in the USA, it will leave a varnish like residue and dry out over time. A very good and inexpensive lubricant is automatic transmission fluid.

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]]> By: Robert Calk Jr. https://jestineyong.com/servicing-mercury-smps-kob-ap4400xa/comment-page-1/#comment-352800 Sat, 02 Mar 2019 02:09:56 +0000 https://jestineyong.com/?p=19002#comment-352800 In reply to Parasuraman S.

A dab of grease barely costs anything. I just remove the old grease with some alcohol, add a dab of new grease, and be done with it.

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]]> By: Parasuraman S https://jestineyong.com/servicing-mercury-smps-kob-ap4400xa/comment-page-1/#comment-352782 Fri, 01 Mar 2019 16:52:15 +0000 https://jestineyong.com/?p=19002#comment-352782 In reply to Robert Calk Jr..

The reason is adding more grease might not get properly mixed with hardened grease already there. Whereas WD40 penetrates and loosens that bond. You can add a little grease afterwards. The method employed by me is spraying WD40 while rotating the fan by hand. That's what gets good result.

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