Need help with charred resistor on digital soldering iron GS110D (SOLVED) - Page 1
Forum section: electronics / repair

author: Koray
author_rank: Regular Contributor
timestamp: September 23, 2018, 02:29:37 pm
content: Hi all,I have this great digitally controlled 110W soldering iron which worked perfectly over a year, but somehow made some cracking noises and died on me recently. I opened it and found a charred blue resistor in-line with mains. Unfortunately I cannot read the color bands on it. I am including some clear photos below, can anyone help?Thanks in advance!KoraySOLVED: it is an 82 ohm metal film resistor.

author: ciccio
author_rank: Frequent Contributor
timestamp: September 23, 2018, 04:21:37 pm
content: I have the smaller 50 W version, the PCB is labeled CXG DS V2.Mine has an 82 ohm resistor (gray-red-back) , but the color code of yours seems different.The manufacurer is SHENZEN CGX ELECTRONICS INDUSTRIAL CO. LTD.the site ishttp://www.cxg.cn/en/index.htmlMaybe they can help you.Best regards

author: Koray
author_rank: Regular Contributor
timestamp: September 23, 2018, 05:15:33 pm
content: Thank you Ciccio. I will contact the manufacturer.Kind regardsKoray

author: Koray
author_rank: Regular Contributor
timestamp: September 28, 2018, 07:02:27 am
content: Quote from: ciccio on September 23, 2018, 04:21:37 pmHi Ciccio,Manufacturer is of no help. I tried using my daughters toy microscope and I think I have a better idea now. The resistor seems to have gray(or silver?), black,, gold bands on it. Since you mentioned 82 ohms, I assume the charred band on mine is also black, which makes it 80 ohms. But that doesn't match any standard resistor value. Attaching a photo of the resistor. Is there a way to calculate the required resistor there?Thanks for help!Koray

author: Chris56000
author_rank: Frequent Contributor
timestamp: September 28, 2018, 12:47:44 pm
content: Hi!I can make it out – it's coloured brown – grey – black with a final gold band which comes out as 18R – a standard E12 value @ ±5% tolerance – I suspect the charred portion wasn't over any coded part of it's body!Since your iron is 110W nominal it's reasonable to assume a lower value than the 82R used in the 50W versions!Give an 18R a go and let us know how you get on!Chris Williams

author: Koray
author_rank: Regular Contributor
timestamp: October 02, 2018, 05:21:29 am
content: Thanks Chris! I cannot see any brown rings there, also the order you suggest doesn't fit the photo. I decided to buy another one to check for the real part specs...From now on I will follow Dave's motto for my new stuff: don't turn it on, take it apart (and take pictures). :-)Thanks for help! I will update when I receive the new one.Koray

author: Koray
author_rank: Regular Contributor
timestamp: February 04, 2019, 08:00:59 pm
content: Update on this issue. Ciccio was right, it is an 82 ohm resistor. It turns out that the red ring on the resistor had faded. I put a 1/2w metal film resistor and now the soldering iron works great.Thanks for all help!K.

author: ciccio
author_rank: Frequent Contributor
timestamp: February 05, 2019, 08:16:48 am
content: I'm really happy for having helpad you.Best regards