Electronics Forum / Repair / August 2008

Built a multimedia machine about 2 years ago, using a Cool Master 600 watt
PS, the fan in which is beginning to fail (sound/speed goes up & down, even
when run on a bench power supply, turning by hand feels rough, etc.), So I'm
looking at Newegg for a replacement 120 x 120 x 25mm ...

26 VAC has been put on a DOME Cameras instead of 12DC.
4 SMT parts blewed up . I have a working one that I can read the marking but
I cannot find what are the value of them.
Here are the 4 parts (i.e:marking on the parts) :

My elderly mother was watching her TV last week when there was a close
lightning strike and now her TV no longer works. It's a conventional CRT set
only two years old and I was wondering if there was possibly anything simple
to look for or if it's toast. I don't have access to ...

we have an old HP4145B parameter analyzer sitting around because the
floppy drive is broken and we cannot boot it anymore. If I am correct
it does not have a hard disk, therefore the floppy drive is mandatory.
Since we have another HP4145B that is still in use, I was wondering if

Looking for a never-published schematic for an RCA PHD50500.  It has
trouble on the main power supply, part number 261670.  The board is not
available, and apparently NEVER was??  What has this world come to?  A High
Definition 50-inch THROW-AWAY PLASMA TV?  Yep, apparently.  The ...

For anyone interested the item No. is 110281084607.

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over the weekend I had a vacuum system fail on me.
In a nutshell, from high to low vac:
vac chamber > turbo pump > electronic safety valve > foreline trap >
rotary pump > oil mist filter > exhaust hose

I found this Viewsonic PS775 monitor in the to-be-recycled pile at the
office.  All the new monitors are LCDs and the old ones are not
necessarily bad when they get rid of them so I thought I would check
it out as a upgrade to a older (early 90s vintage) PC I use

I have a Sony Betamax VCR Model SL-HF360 that has a pulse or "click" in
the HI-FI audio output to the monitor.
This occurs approximately 2 times a second and is consistent. The linear
stereo is normal

I am working on the subject TV set and it's stuck in standby. Does anyone
know where I can get the dead set troubleshooting guide that covers this
chassis? This TV has a complex set of protection circuits!
Thanks,

I have an Onkyo TX-82 stereo receiver.
What happens is that, at random moments during use, the speaker
protection relay may open and cut the sound and then close.
I've tried reflowing all solder joints on the power amp board and

Dear  friends,
This is a very informative group.
regards,
Laxman

When you turn the TV on, either manually or by the remote, the TV does
not come on but there is a clicking sound like a relay coming  and
off, or a relay trying to energize but can't. this continues until the
plug is pulled. Any thoughts?

I have a small ultrasonic cleaner. It's frequency is 40kHz, and I want to
increase it to about 50%. I expect about 15W output. Which parts I should
change? I suspect the two blue capacitors, but I'm not sure. My knowledge in
electronics is low.