Identification needed - Page 1
Forum section: electronics / general

author: jimdubach@mac.com
author_rank: Newbie
timestamp: July 13, 2024, 01:43:00 am
content: Can someone please identify this please?

author: Psi
author_rank: Super Contributor
timestamp: July 13, 2024, 02:19:16 am
content: It's probably a resistor, could be an inductor but most likely resistor given it looks to have an R designator on the pcb next to it.What is the board and where does that 4pos connector go to.It may be a series resistor to limit inrush current to something.

author: jimdubach@mac.com
author_rank: Newbie
timestamp: July 13, 2024, 12:33:24 pm
content: Thanks for your reply. It’s a Mitsubishi split air conditioner control board. The technician said he thinks that this resister may be on the way out because of the brown coloring. And it doesn’t look like a replacement board is any longer available.I am not electronic tech, but have replaced resisters before. So, I’m doing some research to see if I can in this case. So, I hoping I can get this identified and replace it. I know this may be far fetched, but worth a try.

author: PA0PBZ
author_rank: Super Contributor
timestamp: July 13, 2024, 01:17:53 pm
content: Normally the value(s) are printed on the part, but it could be that it disappeared after years of heating up, have a close look at it. If the airco is still working fine you can measure the ohms value of the resistor, but lift one end from the pcb before you do that. Then find a replacement power resistor with the same value and same or slightly bigger size and you should be fine.Having said that, the discoloring doesn't look alarming to me, specially because it is at the end and not in the middle part.

author: jimdubach@mac.com
author_rank: Newbie
timestamp: July 13, 2024, 01:33:57 pm
content: Thank you. Your info is very helpful and is appreciated. One more thing, if it does need to be replaced, any ideas where I can buy the part?

author: JMK
author_rank: Contributor
timestamp: July 14, 2024, 09:43:12 am
content: It is a 2 or 3 Watt wire wound resistor. I'd guess 3, comparing it to the fuses. It is not big enough to be 5 Watts.As mentioned above, its value has probably been burned off after long use.Measuring with an Ohm meter will give you one of two results. If there is measurable resistance it is OK. If it measures open circuit it is faulty. If it is faulty, to determine its value, you need the circuit diagram, or, someone with electronic experience who can understand the circuit and guesstimate a value for replacement.

author: jimdubach@mac.com
author_rank: Newbie
timestamp: July 14, 2024, 11:01:27 pm
content: Thanks for you help!

author: amyk
author_rank: Super Contributor
timestamp: July 15, 2024, 03:22:54 am
content: I don't think the markings are faded/burned off, or indeed that it's unmarked --- look at R72A and R71B to its left, and you'll see that they are printed textually with the value on one side, and not colour-coded. Maybe that print just happened to be on the underside of this one.

author: jimdubach@mac.com
author_rank: Newbie
timestamp: July 15, 2024, 11:48:11 am
content: Thanks for the reply. I do believe are correct. I’ll have to take a look and see for sure.

author: wraper
author_rank: Unknown
timestamp: July 15, 2024, 11:59:57 am
content: I suspect that coloring due to burned dust.

author: jimdubach@mac.com
author_rank: Newbie
timestamp: July 15, 2024, 12:01:19 pm
content: 👍