Comments on: About Thermistor https://jestineyong.com/about-thermistor/ Semiconductors, Test Equipments, Circuit Board Troubleshooting, Electronic Repair Courses and Many More! Thu, 21 Oct 2010 11:16:26 +0000 hourly 1 https://wordpress.org/?v=5.4.19 By: admin https://jestineyong.com/about-thermistor/comment-page-1/#comment-7355 Thu, 21 Oct 2010 11:16:26 +0000 https://www.jestineyong.com/?p=2335#comment-7355 HI Peter,

Sometimes secondary side components shorted also could cause the transformer to have sound. I suggest that you check the secondary section too.

Jestine

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]]> By: Peter https://jestineyong.com/about-thermistor/comment-page-1/#comment-7353 Thu, 21 Oct 2010 03:39:07 +0000 https://www.jestineyong.com/?p=2335#comment-7353 I finally found the sound is coming from the switching transformer, then I tested the DC voltage and I got 0 so I guess I need a new switching transformer, the fuse, bridge rectifier and other componets seem to be ok.

Thank you.

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]]> By: admin https://jestineyong.com/about-thermistor/comment-page-1/#comment-7329 Tue, 19 Oct 2010 20:47:13 +0000 https://www.jestineyong.com/?p=2335#comment-7329 HI Peter,

It should be good. The best test is power on and test the ac supply to the bridge rectifier to see if the ac supply change when the monitor stop working.

As for the sound, it can comes from any components. Try power it on and use the handle of screw driver and gently tap on the transformer and flyback to see if the sound will go away or not.

Jestine

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]]> By: Peter https://jestineyong.com/about-thermistor/comment-page-1/#comment-7323 Tue, 19 Oct 2010 15:36:38 +0000 https://www.jestineyong.com/?p=2335#comment-7323 Hello.

Maybe you can help me, I have a CRT monitor that suddenly stopped working and I found that the board is a bit brown where the thermistor is at, so I tested it with a multimeter and the resistance is 20ohm at room temperature, then I heated it a bit and it came down to 5 and then it went back to 18, do you believe it could be bad?

Also I hear a cricket-like sound every half second when the monitor is connected so I believe it could be a bad capacitor instead but I can't visually find any bulging. I don't want to remove them unless necessary.

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]]> By: admin https://jestineyong.com/about-thermistor/comment-page-1/#comment-4413 Tue, 19 Jan 2010 13:04:52 +0000 https://www.jestineyong.com/?p=2335#comment-4413 Hi Azmoeen,

I don't understand your question, could you elaborate?

Jestine

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]]> By: azmoeen https://jestineyong.com/about-thermistor/comment-page-1/#comment-4410 Tue, 19 Jan 2010 07:00:25 +0000 https://www.jestineyong.com/?p=2335#comment-4410 hi
ineed book help me to find addifrent betoween compunt viue.

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]]> By: admin https://jestineyong.com/about-thermistor/comment-page-1/#comment-3520 Wed, 23 Sep 2009 13:56:34 +0000 https://www.jestineyong.com/?p=2335#comment-3520 Hi Papo,
I have not come across such problem before but one of my repair friend told me that a bad eeprom data could cause such problem. Have you replace the sound IC?

Jestine

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]]> By: Papo https://jestineyong.com/about-thermistor/comment-page-1/#comment-3499 Mon, 21 Sep 2009 07:35:52 +0000 https://www.jestineyong.com/?p=2335#comment-3499 Hello Jestine,
Currently I have a problem with a Genexxa CTV10 10" color TV. The volume up/down is not functioning. It's permanently loud. The sound IC is AN5265. Volume control pin 4 is permanently on 2.5V. I traced to pin 20 of M34300-012SP (a 42 pin IC). The voltage is permanently 1.8V even when the volume button is pressed continuously.

What do I do.

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