Comments on: About Optoisolator IC https://jestineyong.com/about-optoisolator-ic/ Semiconductors, Test Equipments, Circuit Board Troubleshooting, Electronic Repair Courses and Many More! Wed, 07 Jul 2010 00:11:28 +0000 hourly 1 https://wordpress.org/?v=5.4.19 By: admin https://jestineyong.com/about-optoisolator-ic/comment-page-1/#comment-6038 Wed, 07 Jul 2010 00:11:28 +0000 https://www.jestineyong.com/?p=2399#comment-6038 Hi Samson,

You need to solder it out from the power supply and test it.

Jestine

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]]> By: samson https://jestineyong.com/about-optoisolator-ic/comment-page-1/#comment-6034 Tue, 06 Jul 2010 22:03:06 +0000 https://www.jestineyong.com/?p=2399#comment-6034 nice to know functions of opto isolator ic.

how can know that its faulty on switching mode power supply.

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]]> By: admin https://jestineyong.com/about-optoisolator-ic/comment-page-1/#comment-3827 Mon, 02 Nov 2009 23:30:31 +0000 https://www.jestineyong.com/?p=2399#comment-3827 Hi Abdoulie,

You are welcome!

Jestine

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]]> By: Abdoulie Bah https://jestineyong.com/about-optoisolator-ic/comment-page-1/#comment-3826 Mon, 02 Nov 2009 13:32:43 +0000 https://www.jestineyong.com/?p=2399#comment-3826 Thanks very much it great to know wish you well.

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]]> By: admin https://jestineyong.com/about-optoisolator-ic/comment-page-1/#comment-3682 Thu, 15 Oct 2009 14:23:57 +0000 https://www.jestineyong.com/?p=2399#comment-3682 Hi Jorge,
Have voltage at the center pin of FET does not mean there will be power output at secondary side. The best is to use the scope to test on the signal at the gate and the drain pin of FET. There is a possibility because the optoisolator IC send a signal to the power IC to control the "On" time. Bad components in the primary side could have affect the signal from reaching the power IC. I suggest that you check all components in the power side and if possible direct replace the power IC and retest the set again.

Jestine

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]]> By: jgmanza https://jestineyong.com/about-optoisolator-ic/comment-page-1/#comment-3673 Wed, 14 Oct 2009 17:35:16 +0000 https://www.jestineyong.com/?p=2399#comment-3673 Hello Jestine, I have a CRT TV on my bench for two weeks now, and there is good power supply over the Main Filter Capacitor. If I put the probe to hot ground and red probe to center pin of power fet it still have same voltage. If I put the black probe to cold ground and red probe to both side of all secondary diodes there is no voltage.

I was told that it is the optoisolator by a technician who fix CRT monitors here. Could that be so. I ask because I test the opto according to ebook with Analog meter and it test good out of circuit.

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