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A resistor burned in the PSU

I have a problem to read the type on this component there are placed i position TH-01
Can you help me I will be very tankfull

Henrik Zeyn
Denmark
email: heyn@eltech.dk

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'TH' is a common abbreviation for 'thermistor' and they are used to dampen surge current into a supply when first turned on.

Because their purpose in life is to be variable, you will have to get information from the manufacturer if nothing is visible any more on the part.

Typical values if it is used in this manner are ~20 ohms cold and a few ohms or less once hot.

Size determines the peak power rating and they can be very small (2-3 mm) for some applications, and up to ~ 25 mm for others.

The type used in this manner is termed 'negative temperature coefficient' as its value decreases with heat.
There is, of course, also the type that increases with heat, then a 'positive temp-co.'

Depending on the state of destruction of it, you can often get a rough estimate of its range by measuring a fragment with an ohmmeter; this will tell you only if the part is a lower or higher resistance type as they are made in the kilo-ohm range too for other uses.

If I had to guess; I would use a larger one (~20-25 mm) and a cold resistance of ~ 25 ohms at 23 degrees C and a cold resistance (this is less critical) of 2 ohms or less.

Keep in mind - this part may be a victim! While they do fail alone on occasion, you may have a shorted component that forced that part to act like a fuse.

Posted on Sep 01, 2008

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SMD resistor codes isdifferent from the normal resistor color code (color bands) you had seen in theelectronic circuit boards. Surface mount resistors is very much smaller in than the normal carbon film resistor and because of this the numbers andletters were stamped upon or printed on the top side of the component. Thosenumbers and letters have a meaning and you could use that as information tofind out or calculate the desire resistance values. Sometimes the resistors aredesigned in a very small until we have difficulty to read the code. Byusing a magnifier glass we could easily read the resistor codes. clip_image002.jpg clip_image003.jpgThere are two types ofsurface mount resistors used in an electronic circuit board-the 3-digit and4-digit code SMD. The first two digits represent the two digits in the answer.The third digit represents the number of zero's you must place after the twodigits. Theanswer will be in Ohms. For example: 104 which mean 10 0000 (4 zero's)and the final answer is 100k. Let's calculate the 4 digit SMD, 1182 which mean118 00 (2 zero's) and the final answer is 11.8k.

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Hi.

Before proceeding I assume you have technical training along with the multimeter. A full testing must be done with power on, and for safety reason must not be done by an untrained user.

The tip contains only general indications. The reader is supposed to have the training to apply in practice the testing method below.

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When there is no power, test AC in to PSU. If there is no AC in (read volts, or read ohms on power cable), that means that the power cord must be replaced.

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As explained this kind of test must not be done by the unexperienced user, as the chance to waste the unit beyond repair is high, and there are also many safety concerns.

After testing the PSU, next part to test will be the inverter board.

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If the inverter has no DC from controller, then test PSU, if PSU is OK, and inverter has still no DC in when PSU line to inverter is on, then replace controller board.
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