EEVblog Electronics Community Forum

Electronics => Repair => Topic started by: iocowboy on March 11, 2018, 09:36:27 pm

Title: What blew up?
Post by: iocowboy on March 11, 2018, 09:36:27 pm

A friend posted a picture on FB earlier asking what component broke on his DC power supply. The symbol has me thinking resistor but the leads look too long and have me confused. Thought I would bring it to you all and see what you thought.

Aditional shots...
https://imgur.com/SNoGWE5 (https://imgur.com/SNoGWE5)
https://imgur.com/nrzt2KN (https://imgur.com/nrzt2KN)

Title: Re: What blew up?
Post by: jheatac on March 11, 2018, 09:38:49 pm

Quote from: iocowboy on March 11, 2018, 09:36:27 pm

A friend posted a picture on FB earlier asking what component broke on his DC power supply. The symbol has me thinking resistor but the leads look too long and have me confused. Thought I would bring it to you all and see what you thought.

Aditional shots...
https://imgur.com/SNoGWE5 (https://imgur.com/SNoGWE5)
https://imgur.com/nrzt2KN (https://imgur.com/nrzt2KN)

Varister?

Sent from my SM-G920V using Tapatalk

Title: Re: What blew up?
Post by: madires on March 11, 2018, 09:47:01 pm

Possibly an NTC to limit the inrush current. It would be in series with the fuse. A varistor (MOV) would be between L and N to absorb over voltage peaks.

Title: Re: What blew up?
Post by: ArthurDent on March 11, 2018, 10:00:34 pm

As mentioned, a non-linear resistor to limit inrush current. If you are replacing a NTC make sure you check the other parts around it to make sure you don't blow the new part as well.

Title: Re: What blew up?
Post by: Fraser on March 11, 2018, 10:26:04 pm

The clue s was n the labelling...... RT1 ....... "Resistor Thermal 1"

As others have stated it is likely an NTC varistor.

Such parts often fail for a good reason.

Fraser