Electronics Forum / Repair / February 2006

Please help an old TV repairman who started out with <gasp> tubes. I
opened up a GE color TV to set the levels and gain of the RGB signals
and to my suprise nothing on the neck board and nothing on the main pcb.
Am I S.O.L. with the green background or is there some special button ...

test

I have tried to call Lumipures 1-800 # and its always bussy signal . I
have 4 of these units .. tall round unit with the removable washable
metal filter .
At the top is an ultraviolet light . Inside is a small ballast that has

I have a HP UNIX workstation which has sat in a garage for a couple of
years. I've bought it out of storage, powered it up and it worked for
about 30 hours or so. Now it has died. I have reason to believe the
switch-mode power supply might not be fully functional, although it is

If you haven't seen this site yet its defn worth checking out... as a
hobbyist it is defn the best place to buy gadgets to tinker with...
http://www.propertyroom.com/cgi-bin/ncommerce3/CategoryDisplay?cgrfnbr=32029937&
cgmenbr=31895249
http://about.propertyroom.com

Need circuit diagram for Telequipment D73 oscilloscope, or at least the
value of the resistors in the EHT divider chain.
Thanks,
John Mackesy

I had this compact stereo come in with the usual no play cd
symptom. took it apart to look at and clean the laser.
Closer inspection showed the top of the laser was flat instead
of the rounded coated lens that's usually on the top of the laser.

I don't have the original remote for this TV and the universal doesn't
allow me to access the function menus. Originally, I was just trying to
program the channels into the TV. I found that when I press the
"function" and "volume down" buttons together, the screen shows the JVC

I have a  Mitsubishi WS 855511 big screen.
The remote control stopped working recently.

   Light on the remote works.

Got an older projection TV that quit working.  Power switch turns set on
however that is it.  No sound or picture.  It is a NAP PTV300 chassis.  I
checked the HOT on the deflection board and it is ok.  At this point, I'm
thinking something on the power board is probably gone; ...

Can anybody tell me when did cmos move into consumer electronics from
the military? Thanks

My alarm clock makes a weird noise about one night every 6 weeks.   The
noise happens all night for a few seconds every 20 minutes.  It is the
same kind of noise you hear if you get a mobile phone too close to a
computer.  Kind of a stuttered buzzing.  Does anyone know why this

   I've got a Zenith SL7573W from Aug '93, woodgrain cabinet (if that
matters).  The picture looks decent, but the top is collapsed, about an inch
or two is black, followed by white horizontal lines through the next part of
the picture.  The rest looks normal.  Is this a common ...

I am still trying to figure out why the sound gos out on these 203 chassis,
you pick the set up, take it to the shop plug it in to check it out and the
sound is ok, I've had a lot of these do the same thing, it has gotten to
where I just tell them to unplug the set and plug it ...

Awhile back, it was diagnosed on the newsgroup that I have a bag flyback
transform on my Magnavox projection TV.  I have been trying to get the
part from Partsestore.com.  They will report it in inventory, but then I
get an email that they're out and on national backorder; it ...