Electronics Forum / Repair / December 2007

Starting problem Dead TV. RCA 32F530T, chassis ATC113CD4, year 2004. I
Replace flyback # 257807 along with the H-O/P XSTR (2SC5148 original
Toshiba).

I recently got an ancient monochrome video monitor from a friend.  
This thing probably hasn't been powered on for fifteen or twenty years.
I'm thinking I will put it on a variac and turn it up slowly from zero
over several hours, to maybe let electrolytic caps reform, and avoid

Have a 27" Proscan that works fine once you get it to come on, but
intermittently will not start up.  When it won't start there is no 143 volts
standby voltage.  There is raw 150 volts, actually more like 160 volts.
Haven't yet  found any shorted or open components in regulator ...

I have a Western Digital WD800 80 GB drive.  I am not sure why the
drive will not power up.  Here are the specs on the drive:
LBA 156301488
80.0GB

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Looking for the schematic for just this section if possible.  I am
pretty sure I have a flaky supply on one pin.  The VCR would work for
a while then display would blank out.  Working time got shorter and
shorter.

Everythingelse works. Reads DVDs and plays them. Good audio. Good and
bright backlight.
Just no image. Brightness command has no effect on the backlight as
expected; it has a little effect on screen. With brightness@max I can

I'm off in a few hours, across the pond, to (slightly) sunnier climes for a
few days much needed R&R.
So last posting, just to wish everyone a happy Christmas or happy holidays
or happy whatever-it-is-in-your-part-of-the-world, and I'll catch y'all when

Newer cordless handset powers up and plays ring tones, but
the display has no read out (it is blank except for the
working backlight).  Also, no dial tone.
Really need to get it working again.

I am having problems measuring the voltage of a 600 kW six pulse
bridge rectifier with a simple multimeter ....
it is runing through 3 pairs of thyristors (1800 V, 1500 A 200 μs
typical time) the AC burs after a Current transformer (???) attached

I had a loyal client move from Southern California to Pittsburgh. She has a
Marantz 1250 power amp. I serviced it a few times for intermittent popping
noises and signal drop outs. She called and says now it has developed a
constant hum (audio still works). Shipping the amp back to ...

Hi Experts,
I have this Sony Receiver/Amplifier and the Phono circuit appears to be
blown because of a short
in the (phono) connecting wires.

The notorious problem with band/stage amps, the guitar/mike leads making
poor contact inside the sockets.
For anyone saying replace, move to another thread.
I don't see the point in replacing with much the same, that will also weaken

Hello.  I have an old Mitsubishi projection tv that is having problems
with alignment.  I first noticed the problem when the television began
displaying two images; one blue, the other red and green.  When I
attempted to fix the problem by realigning everything I was not able

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