repair

Hello everyone, I was sitting in front of my computer when suddenly my monitor (LG 49WL95C-W) turned off. I opened it and started troubleshooting. It looks like the power supply is the problem because if you connect it to power, the 3.15A fuse blows immediately. I live in Germany and therefore...

Hi, I have been repairing circuit boards for a few years and a plumber friend has come to me in the hope I can fix a few of the faulty boiler boards he has laying around. He tends to send them to ewaste but I'm sure they're easily fixed. I've searched Google and a few forums but can't seem...

I've been using this MC2100 in conjunction with a pwm circuit I built, and had been using it successfully for a time on a bandsaw. I must have pushed it a little too hard when resawing a log, as the motor suddenly stopped in the middle of the cut. The behavior afterward was that turning it on...

Hello I am just a hobbyist and have some interest in electronics and have built 18650 battery packs, arduino iot projects, etc For harvesting old 18650 Lithium-Ion cells, got a Capacity tester named HW-586 (a copy of another popular ZB2L3 ). Its a simple analyzer which using power resistor load...

I bought an electric blanket which turns on (led lights up) but doesn't seem to be producing heat. And if it is, its very low. The label says it 40w. I watched this video on YouTube on the same thing and followed his findings. His ones don't turn on at all but mine does. Its drawing power...

Is there such a thing as "If all the IGBTs are good, then all the SMD resistors, capacitors and zeners on the legs of the IGBTs are good" in the inverter welding machines? That is, as long as at least one of the IGBTs does not explode, will the SMD elements underneath remain intact?

Hello everyone and greetings. I have got my hands on this massage chair that has all it's functions working all right except for the up down mechanism. As soon as it is started the main assembly moves up and hits the upper limit switch but the drive motor does not stop and starts to vibrating...

The attached image is my failed 120VAC 1.0A -> 30VDC 0.5A power supply. I'm trying to figure out what I need to change to fix it without changing everything. I'm not an electronics expert, but looking at the board it has a transformer, one big capacitor and two smaller ones, a transistor...

I am trying to figure out why this portable speaker is sounding distorted even when plugged into the wall. My initial feeling is that its related to the 12v charging circuit but I may be wrong. The speaker was sitting from 2017 in a box and I opened it a few months ago. I tested it and straight...

Hello, I am working on my 2018 GMC instrument cluster. It has a parasitic current draw that drains the battery within 3 days. I found this part which to me, looks like and SMD diode. It is reading "OL" in circuit and out of circuit. See attached photo. I have tried looking through the SMD Code...

Hello forum! My sibling broke their earphones and I am trying to repair them, but cannot understand on which solder pad should I solder the "golden" wire, because the pads are identical to me. I looked for schematic online, but could not find one and since these are fake I guess there won't be...

So i pulled this antenna cable off a tad to willy nilly whilst disassembling to repair something else and it's broken the very tiny u.lf or similar connector. I know I shouldn't have, but here we are anyway, no way back now. It looks to me like the pads are still intact underneath half of...

hi, I ask for your help to: determine, if possible, the type of transistor T5, T7 (SMD code: MK3C). help me to understand the operating role of the set T5, T7 and R23, R33 in the circuit (it's like a logical port type AND, but I do not understand how it works). help me understand why the...

Hi, I have a crt monitor that dosent work now, I figured out that a mosfet was running very hot and was shorting the smps(making it stop and restart), I removed it and saw that theres no short circuit now and the led/buttons works but theres no picture, it's the mosfet that generates the B+...

My Multi-meter Uni-T M890C+ tasted 600V while in 200 Ohm Setting, i was troubleshooting a Fence Energizer. I heard a small popping sound but no magic smoke, burnt traces or components. The display works fine, it now displays random numbers, negative sign and the AC symbol. I am no good at...

Forgive me, I am new and have little to no experience with circuitry. I am very sorry if this is not the right place to ask or this forum is intended for more experienced people. Hi, I have a Pro Fitness JX 260 / JX 263. I read up online that the circuit breaks and doesn't allow the treadmill...

Hello, I have this issue with the case of the Nokia Earbuds BH-605 where the battery is not charging anymore. I noticed that a diode has fallen off but I can't find it anymore. Below are some pictures. I'm an absolute novice regarding to electronics, is there a way to determine which diode I...

Hi all I hope you are well and keeping some degree of sanity during the pandemic! I run a little business repairing and servicing treadmills which covers all aspects of getting hem back on track The majority of the repairs centre around the PCB's which seem to be relatively simple but break...

My mom has an old ~40 year old audio amplifier LUXMAN L-210, that hasn't been turned on for about a decade. I found some time the other day and turned it on to see whether it's working and how it's performing. So it did turn on and seemed to work (I have radio tuner, cassette player and disk...

tl;dr - I'm a newbie in Ghana trying to troubleshoot the power supply board for my projector that died in a power surge. I have replaced visibly compromised capacitor, but need to test others. Where can I find resources on how to do this safely? Hi all - I'm an American living in Ghana and my...