Re: Crown Amp DC300A - One channel distirted, other good.

I've never tried it, but there is "soundcard scope" software which uses the line in of a laptop / PC. Definitely want a voltage divider + AC coupling capacitor for that one, though!

Re: Crown Amp DC300A - One channel distirted, other good.

One of the quickest ways of troubleshooting just one bad channel is to feed the amp with the same, say, 1 kHz sine on both channels and then just working from either the inputs or the outputs, checking the signal shape on the good and comparing it to the bad.

I usually start from the outputs, because the higher the power, the more often it breaks.


Edit: Removing C218 might result in HF oscillation of the amplifier, but it probably won't.

I'm currently working on a ASUS PG279Q (27", 2560x1440 IPS G-Sync, pretty expensive when new) which shows no image. According to the owner it worked fine one evening and didn't work the next day. No prior change in device behavior, apart from two stuck pixels which have been there since the beginning.

Things I checked so far:

- The backlight is fully operational
- When turned on, the backlight comes on, and the image remains dark. If you look very closely about 2/3 of the panel are fully black while 1/3 are slightly brighter. Some very faint vertical stripes...

Re: New Members - please post your introductions here

Hi all, I'm an electronics tinkerer and currently somewhat out of my depth with a current repair job - I heard this is the place to ask...