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Bad connection on tv

P

Puddin' Man

Jan 1, 1970
0
Panasonic 17" color tv, mnfgr'd 1987. Standard design, layout near as
I can tell.

Dog bumps tv stand, pic is still viewable, but goes snowy and has
pulsing waves across screen.

If I fiddle the power cord where it enters the box or bang on side of
box I can get the proper pic back, if only for a second or 2.

I'm not particularly skilled at electronics, but if I could get proper
access to where the cord connects to the power supply, I could likely
solder the connection or some-such. Access looks kinda problematical:
it's right under the nasty ol' CRT. The one that stores (what?) 20k
volts?

I know, I know. The unit is truly jurassic, and the new LCD's etc
are priced down a bunch. But it's stereo and it's connected to my
jurassic stereo audio system. And I don't think enough of what they
broadcast to spend any $ on it unless I have no choice.

Any ideas on how to approach it? Just workbench it and start
disassembling stuff? Cautions other than about the 20kv "gun" at the
back of the CRT? Etc, etc.

Thx,
Puddin'

"Law Without Equity Is No Law At All. It Is A Form Of Jungle Rule."
 
D

David Nebenzahl

Jan 1, 1970
0
Any ideas on how to approach it? Just workbench it and start
disassembling stuff? Cautions other than about the 20kv "gun" at the
back of the CRT? Etc, etc.

To begin with, you could probably do with a little high-voltage
precautionary education before you seriously zap yourself.

The high voltage isn't at the "gun" (actually the tube socket) at the
back of the CRT: it's at the anode, which surrounds the tube and has a
high-voltage lead connecting it to the rest of the set. This acts as a
giant capacitor which can store a lethal charge.

Others here will tell you more. But learn up about HV first.
 
P

Puddin' Man

Jan 1, 1970
0
The first place I'd look is the RF or video input connection (on the
outside of the TV)--perhaps the connection is loose or corroded, or the
cable is breaking near the connector.

The video input is about 1" from the power cord. The power cord seemed
to be -very- sensitive to the condition, the vid. input less so, but
after firmly re-seating the vid. input, the problem seems to have
disappeared. So it was either the video input as you said or it's
an intermittent problem that's likely to be a real headache down the
road.

Much Thanks,
P

"Law Without Equity Is No Law At All. It Is A Form Of Jungle Rule."
 
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