| T.R | Title | User | Personal
Name | Date | Lines |
|---|
| 1122.1 | A good cleaning first... | BSS::D_BANKS | David Banks -- N�ION | Tue Apr 23 1991 10:49 | 19 |
| 1122.2 | Re .1 | VAXWRK::KOTHARI | | Tue Apr 23 1991 13:40 | 18 |
| 1122.3 | | OPAMP::VMILLER | Been lookin' kinda SCSI lately | Tue Apr 23 1991 14:10 | 20 |
| 1122.4 | Sometimes CHASSIS .ne. GROUND :-( | BSS::D_BANKS | David Banks -- N�ION | Tue Apr 23 1991 15:19 | 17 |
| 1122.5 | New fuse blew up right away | VAXWRK::KOTHARI | | Thu Apr 25 1991 08:38 | 11 |
| 1122.6 | Set cycles on/of in 15min periods | NPSS::WADE | Network Systems Support | Wed Feb 19 1997 13:27 | 11 |
| My ~16 year old Zenith 19" portable runs for about 15-30 minutes then
gives off a load cracking/snapping sound and the tube goes black.
After another 15-30 minutes it comes on fine then the cycle starts
continues.
This set has certainly given me my $s worth but if anyone has any
ideas, short of bringing it to a repair shop, I'm game.
Bill
|
| 1122.7 | Crack in board | ENGPTR::MCMAHON | | Wed Feb 19 1997 14:08 | 4 |
| This sounds a lot like what was going on with a 19" that I have. Turned
out to be a crack in (one of) the circuit board that didn't show up
until it warmed up and expanded. Took my neighbor a week to track that
one down.
|
| 1122.8 | | CPEEDY::FLEURY | | Thu Feb 20 1997 08:18 | 8 |
| RE: .-1
If you are hearing a snapping sound, then you probably have some arcing
going on. Open up the back and look for burn marks either on the board
or the flyback. I suspect that the flyback insullation is breaking
down. This is not unusual.
Dan
|
| 1122.9 | check for dust | CONSLT::ARDUINO | | Thu Feb 20 1997 12:55 | 9 |
|
If it's this old --- check for dust that is causing it to arc. The
snapping sound is probably the HV (around 27KV) that is causing it.
If this continues for awhile it will develop a carbon track. This will
then happen all the time until it completely fails.
good luck,
//John
|
| 1122.10 | try looking for it! | ODIXIE::SIMPSONT | PC = world's biggest con job! | Tue Feb 25 1997 20:10 | 6 |
| Try taking the back off the TV and turning out the room lights. After
your eyes adjust to the dark, you might be able to spot it!
Be careful not to accidently touch the high voltage areas in the dark!!
-Tom
|
| 1122.11 | | ATLANT::SCHMIDT | See http://atlant2.zko.dec.com/ | Tue Feb 25 1997 20:25 | 11 |
| Please also note that some TVs have some deliberate spark-gaps
built into them. Generally, they look like thick ceramic cap-
acitors with a saw-slot cut through the top of them and they're
often located on the daughter-card that also holds the CRT socket.
I don't think they should "fire" routinely, but instead are put
there to prevent arcs that would otherwise occur within the CRT.
I'd suppose dust-n-crud build-up over time could dramatically
lower the firing voltage of these spark-gaps, though.
Atlant
|
| 1122.12 | | TLE::REAGAN | All of this chaos makes perfect sense | Fri Feb 28 1997 13:36 | 7 |
| Yep, I had a 6 year old Sony XBR that had a similar problem. Heat
stress broke a few solder joints on one of the boards. The repair show
said they see that quite often (and complained that Sony uses boards that
are a little too thin in their opinion). They resoldered several suspect
looking solder joints. All better now.
-John
|
| 1122.13 | Wasn't a 27XBR50 by any chance, was it? | TLE::INGRAM | oops | Fri Feb 28 1997 14:31 | 0 |
| 1122.14 | | TLE::REAGAN | All of this chaos makes perfect sense | Sat Mar 01 1997 10:11 | 3 |
| I was a little older than that... 27XBR15
-John
|