1. M

    Help! Triac operation for AC motor

    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...
  2. C

    AC-DC Power supply failure

    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...
  3. J

    RZ12A V3 portable speaker not charging correctly and sounding distorted

    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...
  4. Anna Swinemar

    [SOLVED] Unidentifiable SMD Component (possibly Diode)

    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...
  5. P

    Can not identify wire on broken fake akg earphones

    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...
  6. lukewakeford

    Repairing an micro u.lf? connector on xbox controller motherboard

    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...
  7. M

    Help to understand the operating logic of the Bosch charger

    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...
  8. M

    No B+ Voltage on CRT monitor

    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+...
  9. D

    My Multimeter Uni-T M890C+ tasted 600V while in 200 Ohm Setting

    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...
  10. B

    Treadmill - internal magnet intended for safety stopped working

    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...
  11. M

    Nokia Earbuds BH-605 not charging

    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...
  12. A

    Looking for some advice on getting started with PCB repairs (excuse the noobishness!)

    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...
  13. CobraL0rd

    Old Amplifier reeks a burned smell and smokes after being turned on

    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...
  14. F

    Resources for troubleshooting power supply board safely?

    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...
  15. TravisHC

    HELP *** Burnt resistor of camera.

    Well to start i am in no way an electrician or an engineer. Lol I'm just an old ironhead, im a ironworker and my hobby is electronics but I'm always working in the software side but as of lately I been dabling in the hardware side and got a soldering iron and everything needed with it I havnt...
  16. q4#W$7#y

    Denon DRA-545R Stereo Receiver - No Speaker Output

    I'm looking for some help with my Denon DRA-545R receiver. I've owned this receiver from new and have not experienced any problems until the last few years when it started having issues starting up. I replaced a capacitor (C645) after finding this thread...
  17. S

    HP Compaq LA2405wg Monitor repair

    Attached is picture of power supply board from HP Monitor (LA2405wg) when i power it on its power light blinks in green color, it gives a small splash of picture and some sound from power supply, then screen gets black, and it keeps happening When i googled, i came to know that these monitors...
  18. K

    Alliance (Keys Fitness) Treadmill Motor Controller Help

    Hello! I am looking for any advise you may have on repairing an Alliance (Keys Fitness) treadmill. My mom was running on it last night when it stopped suddenly then started to spark inside the motor cover. She immediately unplugged it and there was a strong burning smell. I removed the...
  19. Crazy_BJT

    Troubleshooting/repair Hameg 1500 scope

    Hi there to you all, I need some help with a troubleshooting/ repair. I have an analog/digital oscilloscope Hameg HM1500, it has some RTC problem, it presents a partial sweep. I think is the horizontal circuit, that's either missing a voltage or there is some faulty component. The only problem...
  20. A

    Repair Lecroy Waverunner 104MXi

    Hi, I am trying to repair a Lecroy Waverunner 104MXi. The problem is when you plug it in and switch it ON, windows starts booting but then it just turns off. Now if I try to switch the oscilloscope ON again then it does not work until and unplug it and plug it back in again. I...
Top