Hi gents, I have bought a second hand VSX LX-55 AV amplifier from Pioneer and the blue light was flashing without display at first power on. After testing the switching power supply, I realized I could simply reset the amplifier: the display is back and all functions work well like Internet radio and stuff. The problem is the absolute lack of sound in any configuration. I've tried the many options and ended-up entering music via the CD inputs, no luck, desperately silent. I know these amplifiers have a TI DSP (D810K013BZKB4) and they often die bringing a typical error. But not here, no error at all. I could try to trace some of the signals this amplifier but I could not locate the service manual anywhere (for LX55 or VSX 2021). A gentleman kindly suggested this one (https://www.hifiengine.com/manual_li...vsx-lx55.shtml) but no luck, the service manuals are very light with no electrical schematics. If you have leads I could follow to fix this beast, I would appreciate. Thanks a lot.
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so i took out one of my spare gigabyte ep35-ds3r mobos from storage for use to do some cpu, ram and video card testing of stuff i bought from ebay and got for free from momaka. he bought 50 e8400 cpus for cheap from ebay some years ago and i decided to help him relieve him of some of his supply since he had waaaay too many!!
what did we say about hoarding too much stuff and depriving others of them?! *cough* socialism *cough* lol! 
i had to blow some dust off the board and heatsinks with the datavac as i didnt clean it up before putting it in storage. after finishing... -
Hi, people.
I've got an amplifier assembly from Mackie CR4 parts. It's just an amplifier, there was no speaker housing, so I used my set of CR4s to test it.
Anyway, upon connecting everything and hooking the "new" amplifier to an audio source, the sound played clearly and strongly for the first ten seconds. I was happy it was working. Then the sound started to fade out during the playback until it was no more. After it had "dropped to zero", there were two very short intervals of sound playing at the normal volume, as if the amplifier was trying to... -
I'n trying to fix a M&S SYSTEM DMC-1which have following problem:
I'm using FM station to do this fix, I works perfect if volume below around 8 or if bass is set to zero, the sound can go to 20 without problem, but if I set bass to maximum and try to go over 10 the sound comes distorted ... I saw a video on YouTube the person saying about the main capacitors on the power portion, but I disconnect the main transformer and inject direct to the capacitors PINs my bench power supply -23v 0v +23v, but still distorted so I think the problem is not the capacitor neither the transformer... -
Hi:
I bought this amplifier from the 70s to try to repair it. So far it has no output sound, just noise. You can volume it up and down.
I've checked fuses and all are ok.
I've continued with capacitors:- The main black one should have 4700uF, but it has lost half of its capacity during these years.
- The ones that I've numbered have still a really low ESR and the full capacity after ¿40 years?
The 4 transitors are perfect. Desoldered and tested individually.
There are also components which I don't know exactly what they are.... -
Hello to the forum.
My name is Christos, I am new to the forum here and i am posting from Greece.
So i have this old German sound card from Marian, called Trace Alpha. To be exact i have 2 of them and i use them professionally for my small FM radio station here. The first one works like a charm, but the second one does not work at all.
To be more specific in the same exact pc with windows 7 (i even tried 32bit) the one works while the other doesn't.
So i tried asking for a schematic from the company and they would not give me one. Instead they...
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