Electronics Forum / Repair / September 2007

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This set had a shorted hor output and an open 2.7 ohm fusible in the
power supply. I also did alot of soldering on the board as well. The
original output transistor was an S2000. The Thompson data sheet shows
it as being a 1500V 8 A part. I used a BUH 715 as a sub which is also

i want to see if a short is causing a drain on my car battery.
i have a digital multimeter. one way i theorized was to connect it in
series with the battery via the earth lead and negative terminal.
is this logic sound? or will i fry my multimeter? is there any other

Anything else I need to be concerned with before replacing the HOT?
Any known issues I need to look for? I searched for information on
this model with no luck. I wiil reflow flyback and driver transformer,
if nothing else. Thanks.

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Basically is it normal for TVs to output 50V AC from core and sheild
to ground only when the TV is turned on?
Here is my long and drawn out story but I hope someone can help me.
Cable company shows up at house to try and figure out what is going on

Its getting worse on most tv stations now . they lower the program
volume slowly through out the show . I can measure this by my volume bar
on screen .
I called one station and they admited to it .

My brothers PTV crashed and one of the SMPS
controller IC's appears to be bad.
The hot side controller IC P/N  612664-2 I have identified
as a Motorola  MC34056

Dont have the unit here for a model # . Its about 2 years old still in
its box and looking new .
DVD recorder and VCR unit . When its plugged in a row of 00000  scan in
a row a few times then F60 .  No functions respond . When a tape is

I have just been given an Emerson/Orion 1995 model TC1375A color tv.
The power relay clicks on and off from the power switch, everything
else is totally quiet.  There is +150 or so volts at various points on
the chassis when the power is on, but that is as far as I have gone so

I have a subwoofer in which there is a strange noise with the speaker
as if the voice coil or the cone of the speaker is touching somewhere
so wat to do to prevent the noise . . .

I'm trying to help a neighbor setup her used Mitsubishi CS-27EX1 tv for
cable that someone bought for her: no manual and no factory remote.
The physical buttons behind the small door are minimal:
A/V reset (not sure what this does)

After 20+ years of faithful service (please forgive the pathetic fallacy),
my NAD MR-20 has started having problems (which I'll get to shortly).
In the late '80s, NAD (New Acoustic Dimension) and Proton started making
high-quality color TVs, in an attempt to take market share from ...

I have just had a Denon AVR1800 AV amp come across my bench. It is a
reasonably sophisticated model with six channels and Dolby Digital and DTS
modes, optical inputs and so on. It has an open circuit power transformer
primary. Enquires to the Denon spares agent came back with the ...

http://video.google.com/videoplay?docid=8513588739057530758&hl=en
as you can see , all 4 channels traces jumps like crazy .
Readout is fine , only the trace is jumpy , in any time base and also
in  X-Y mode ....