hi to all here..i have a problem with q99 amp with very low signal 1khz from generator 100-300mv the first two signal leds lights on the front panel and the red limiter led in booth chanels.when i rise up the signal fron generator the amp goes to protect mode and turn the signal low again the amp stays on.the output is working fine with no noise or dc on speakons.it happens something in the inpout is faulty smd component or what ever.thanks for any diagnostic help
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Hi everyone, over the past few months i have taken a deep dive into motherboard diagnostics and I love the challenge. Currently im trying to learn all about the signals that travel around the motherboard, such as frequencies, enable signals High and Low logic states etc. And i have been learning to read and using the Schematics for this board that i requested here on Badcaps forum, from a few months ago, this is such a great place for these.
I’ve been working on a GA-970A-DS3 (rev. 1.0) that does not post. This motherboard has been my main learning board. I would like share...11-23-2023, 11:02 PM -
Hello everyone,
I'm turning to the Badcaps community to help me troubleshoot the radio Rx card from my (old) garage door opener. While I could just ditch that card and replace the whole system, I first would like to understand "why" it suddenly stopped working, because that's just how I am wired...!
Some basics: the receiver works on a 30.875 Mhz frequency. Yes, I'm aware this is not in use anymore in a looot of places. It does not use any rolling code, it's just a regular dip-switch code that you have to set up on both the receiver and transmitter. The receiver... -
I recently bought one of these I do I use this device correctly
https://www.ebay.com/itm/406019936826?var=676327747036 -
Failure Symptom
No picture, just red vertical stripes. Google search shows quite common problem for these recent Vizio M series although red vertical stripe pattern may differ. Some call it "Netflix" boot screen haha.
Where is the short?
Panel has 4x buffer boards. Quickly found the 1/4 panel buffer board with the problem by selectively disconnecting buffer board flex cables.
Having recently fixed another Vizio with similar symptoms that was a shorted ESD diode array ( link ) Probed the ESD diode array but... -
Hi,
Was working fine, but now dead, tried different power supply and still the same.
No noticeable marks on the circuit board.
The only possible issue I can think of, was that I wasn't using the switch on the unit to turn it on/off, I was using the wall socket (For a few months), because I thought the switch was getting a bit loose.
What info do you need to try and troubleshoot?
TIA
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