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NTC Thermistor

By on May 19, 2008

ntc

Hello Jestine

I have a satellite receiver with no power and I did the voltage test with light bulb across the fuse. I found this component to get hot but I am not sure what type of resistor or capacitor it is. On the board it says TH1 and it is dark in color. The part has 10SP 010 written on it. Can I replace it with something similar. Thanks D.D

Hi D,
It was a NTC thermistor and the function is to limit the inrush current that can kill the components in the power section during start up. An NTC thermistor has a relatively high resistance at room temperature, so at turn-on, it limits the current charging the load’s rail capacitors. As the thermistor heats up, its resistance drops, so the power supply becomes relatively low impedance. You can test it using an analog meter set to x 1 ohm and it should show a low ohms reading. In your case i guess the thermistor have no problem and it could be in somewhere else. Hope this helps!

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17 Comments

  1. musa zugheir

    May 11, 2010 at 7:15 am

    i went to now how to repaer tv

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  2. admin

    May 11, 2010 at 10:09 am

    Hi Musa,

    May i know what is your question?

    Jestine

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  3. Roger Karlsen

    October 9, 2010 at 9:12 am

    Hi Jestine!

    This question may be a little off topic, but you seem to know about NTC thermistors, so i thought i´ll give it a try.
    I have been searching the net for a suitable digital thermometer for measuring temperature in my solar panel. I know the temperature may reach as high as 180 degrees Celsius on a sunny day, so the meter range capability shold be somewhat between 0 and 200 degrees C.
    The Trumeter DPM 952 panel meter seems to be useful, but i cant find a curcuit schematic for measuring temperatures that high. The cable distance between solar panel and place for display is about 8 meters. The NTC thermistor type M87 handles temperatures up to 300 degrees C. Do you of a way to connect them together? Or do you have another recommendation?

    Thank you

    Roger Karlsen
    Gothenburg, Sweden

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  4. admin

    October 12, 2010 at 8:49 am

    HI Roger,
    Sorry i have no info on it because i would usually check if the component is good or bad only and did not entirely check on the temperature. It is kind of new thing to me too when you said you have used a thermometer to measure on a thermistor.

    Jestine

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  5. Adam Davis

    November 13, 2010 at 8:18 am

    Hi Jestine,

    I wonder if you can help me please.
    I've been asked to repair a friend's Alesis Prolinear 820 studio monitor speaker which has a built-in amp, I haven't been able to find a diagram on-line for it. There was a fire on the board damaging four components in all, of which I've managed to identify all but one, an item marked 10SP 005 (marked RT 1 on the board) which was badly burnt it seemed to have a type of plastic body (what was left of it crumbled when removed from the board) with a 5mm gap between the board pins. Can you help me to identify this part please?
    If it helps the other damaged parts were, a 100K resistor, a X1 type Interference Suppression Capacitor 0.47uF, and a 5A 250V radial fuse.

    Adam Davis.

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  6. admin

    November 14, 2010 at 9:25 am

    HI ADAM,

    Sorry i do not have the schematic. It seems that the set was hit by a surge. That component is a thermistor. Assuming if you can't find the part you can ask from any electronics shop for any thermistor use in the ac line. Or you can just connect a wire to replace the thermistor but now the set will no longer have any protection against surge.

    Jestine

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  7. Adam Davis

    November 14, 2010 at 4:41 pm

    Hi Jestine,

    Thank you, that's been really useful, I wanted to be sure that it was the right type of component. I can now get a Thermistor to replace it with.

    Thank you once again.

    Adam Davis.

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  8. mukesh

    January 24, 2012 at 8:31 pm

    The part has 10SP 010 written on it. ... which I've managed to identify all but one, an item marked 10SP 005 (marked RT 1 on the board) which was badly burnt, could you tell me what is this and it alternative

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  9. admin

    January 25, 2012 at 8:42 am

    Hi Mukesh,

    It the component is connected in series with the main ac line the it is a thermister. If it is connected parallel between the main ac line with the ground then it is a varistor.

    Jestine

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  10. KLR Dheeraj

    May 2, 2013 at 11:48 am

    When Iam repairing a 5V 30A power supply and switched ON, a spark came from the thermistor 10SP 010.can u guess what may be the reason?

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    • Jestine Yong

      May 3, 2013 at 10:05 am

      Hi KLR,

      Probably the thermistor is already in bad condition otherwise it would not spark. Most of the time it will have very tiny hole in the thermistor body.

      Jestine

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  11. KLR Dheeraj

    May 2, 2013 at 11:52 am

    I want to make a PCB with O/P as 48V 30KHZ 150W and I/P as 440V 2phase.WHAT MAY BE THE COMPONENTS REQUIRED OR WHERE IT WILL BE MADE OR SOLD(WHATEVER)?

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    • Jestine Yong

      May 3, 2013 at 10:04 am

      Hi KLR,

      Sorry i can't provide to you this info becase I'm not into designing field. I suggest that you visit those electronics design forum as I believe there will be someone in the forum that can assist you on this matter.

      Jestine

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  12. Mark

    April 8, 2016 at 7:03 am

    Hi I am repairing a Craig 13'' tv. It won't power on but you can hear a clicking sound in it. The ntc thermistor beside the posistor get very hot can u guess what the problem could be plz.

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    • Jestine Yong

      April 8, 2016 at 9:55 am

      Hi Mark,
      If ntc is very hot then there could be something has shorted. Have you checked if the output voltages from the power supply low or pulsate? You may have to isolate it by going into this link below:

      https://hplibya.files.wordpress.com/2011/11/2957819-tt204-identifying-television-smps-problems1.pdf

      Jestine

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  13. Hercules

    April 1, 2019 at 1:26 pm

    Hi Jestine,

    Lately I encounter a lots of CRT with thermistor opened. Generally what cause thermistor open? Could unstable ac power one of the factor? Thanks in advance.

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    • Jestine Yong

      April 2, 2019 at 10:42 am

      Hi Hercules,

      Yes possible the power line could have a high current surge.

      Jestine

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