Electronics Forum / Repair / August 2004

service guy charged me $400
to replace the High Volt circuit board >
I think I was ripped off

I have recently purchased a Sharp SX76NF100 76 cm pure flat screen TV. This
TV has been refurbished by Sharp but it came with 12 months warranty. The
visible damages are on the cabinet (outer casing of the TV). These are long
scatches but they do not extend onto the screen itself.

Have just read a previous thread about the above and have a problem
which doesn't quite fit in to the same (I think).  My 1 year old
fridgefreezer appears to be working 100% OK BUT there is a huge sheet
of ice at the bottom of the freezer infront of the bottom basket,

Hello electronics experts
I hoped someone could help a novice with this repair.  I recently bought an
organ (70's technology!) but one PCB has been physically damaged.  I have
some broken devices on this board (as well as some broken tracks).  They are

After successfully fixing convergence problem few months ago(by changing
STKs), I'm attempting another repair on this TV.
Few weeks ago it started to sound high pitch noise after warming up for few
hours. After being off completely for a week (we went on vacation), it would

In order to fix my Sony TA-AX3 amplifier (I have already fixed the SMPS
 :-)!), I need the schematics, as one channel is not working properly.
Please, could somebody help me on this?
Thanks and best regards,

Hi, all. I have an HP P1110 21" monitor with a weird high-voltage
problem. Turn it on, great pic. After about 30 seconds, it blooms and
gets very out of focus, then the neon flashover lamp near the flyback
arcs over, there's a loud pop, and the pic disappears. A second later,

I have been trouble shooting components on this TV (32 inch manufacured in
1997)  Went dead by a pop, then vertical line then to a point.  Replaced
Horizontal Drive Transistor with a NTE part, slightly lower spec.  Replaced
two power switching transistors on the power board.

Have a model SU-G91PP-K,  Stereo amplifier in shop.  Has two
1/4 watt resistors burnt up in the blower fan circuit sector.  Since
I don't have the schem. for this, can anyone advise what the values
of Bd. Location: R659 and R780 should be?

The blue picture has shifted left on my old projection TV.  At one point,
this only occured when the TV was cold and would clear up.  I can test
components and replace them however the actual circuitry doesn't make sense
to me.

Can someone be nice and tell me the value of R323 in this TV? (Its a 2W
sized resistor that feeds one of the LT supplies).
The one fitted as failed O/C and I'm unsure as to the correct value - at
first sight the colours read as Brown - Grey - Brown; but then if the other

I have a Dish 500 satellite hooked up to a generic Panasonic PV-8450 VCR.
If I connect audio/video cables from the Dish reciever to the VCR the
reception is picture perfect, once I switch to using coaxial cable from
the Dish Reciever to VCR there are moving Horizontal lines of

bought tv used, worked fine 1 month. now turn power goes into sleep mode or
timer ?. I do not have a remote.
is there a universal remote or can I turn off sleep mode manually.  does
anyone have info on this.  thanks

Hi, everyone,
I picked up a Heathkit short wave transistorized radio, model SW-717,
"series no" 08731, at a garage sale this W/E - not working well, some
reception on BC bands but low sensitivity.  I put a few low level sig.

I'm currently working on an old open reel tape deck (realistic 909)
and having problems with one of the channels.  The left channel is
very quiet unless it is turned up all the way, even then it's only
putting out about ~.2V at full volume, compared to the right at ~2V