Electronics Forum / Repair / July 2004

I have an RCA F27443 that only has a horizontal along the center of
the screen.
I've replaced the output transistor. Any other suggestions? It has
been awhile since I've repaired tv's. Amazing what you forget in a few

I'm in need of a circuit (simpler the better) that will take
the voltage/current that's normally driving a single LED and
allow me to drive the coil of a relay (SS or mechanical)
that has enough balls to handle 12-24V at 2 amps or so.  If

Hello fooks,
My television (a Goldstar 70cm, 7 years old) have next problem:. Since two
days when we put it on, afther a while (few minuts) the screen get black but
sound stay's, also when i switch channel and also when i have another input

I am working on a CTC187 chassis. The usual Cr4106 & U4101  were the
problem. I have been out of the repair business for a few months because of
health issues that require surgery and recoop time. I am now getting back
into service repair. The problem is the set is running just fine ...

I need to replace the 20k pot (broken) for the trigger level control in a
Tektronix 442 oscilloscope. The pot is a Clarostat, 311-1787-00.
The pot has three terminals at the rear and one at front center.
What is the front terminal for?

Maybe there is someone here with an ideas brighter than mine.  I'm
trying to hook up my Playstation 2 to my 5 year old Trinitron via
s-video. Despite trying a number of cables, whenever I'm playing DVDs,
the video signal will intermittently be lost for a second or two at a

Does anyone here have any experience with this old LCD projector?  The
low voltage power supply switching reg IC is getting too hot to touch
within a 2-3 min.  It's an shindengen MA1050 IC.  I've downloaded the
data sheet from shindengen, but it's useless (doesn't even give a

I have a Panasonic TX32PL1 TV with sky digital & a DVD player
connected to it, but lately the colouring on my TV has become
distorted, especially around text and white images.
I am pretty sure it is the TV because when I change the channel, the

I have a Radio Shack Vox casette recorder model# CTR 121
The audio has gotten weak and the tone control does NOT change the tone.  
The audio has kind of a muffled sound.
Can anyone offer any ideas what  it might be?

I need to use EPROM chip 27c400. It is very old, the stroe has only
27c4001. Can I use any other (E)EPROM chip instead?
Please help.

Got a 20" trinitron screen that takes ages to turn on. Everything I read
seems to point to a dying capacitor, probably one of the filter capacitors
being dried up, or some other capacitor in the power supply. If open it up,
how easy will it be to find this capacitor? What should I ...

Ok, this is a bit off topic, but not quite as off-topic as "Lisa Simpsons
Breasts"
I'm looking for a article that was in Popular Science, or Popular Mechanics.
This article was about a Florida based company, that I believe was called

I have a home system DVD recorder model "Philips DVD-R70"
When I copy a DVD from my second DVD player (Linked via Scart) it plays back
on all other DVD players ok if I use DVD+RW disks but if I use a DVD-R disk
it doesn't play on any of the other machines except for the Philips ...

the tv suddenly went to nothing but snow for a picture. would like to
know if repairing would be possible and how expensive would the
repairs be.

I have this 19" monitor with this problem;
There is arking in the CRT socket ?
I have removed it from the tube and it still arks?
I have looked for shorted capacitors but I don't see any?