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Troubleshooting CRT TV picture problems?


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#1 of 13 RustyD

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Posted December 16 2005 - 01:06 AM

My 14yr old 32" Toshiba now has lines at the top until tv is on for about 1/2 hour. Then there is a slight stretch at the top giving heads at top of screen a little cone head effect. Is the tube finally going or can it be saved. I had hoped to wait until things are more stabilized in the HD market before I got a new one but...Any forums on problems

#2 of 13 Dan Driscoll

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Posted December 16 2005 - 02:06 AM

The CRT itself is probably OK, although at 14 y/o output has to be down considerably and it probably doesn't focus as well as it should. The stretch problem could be caused by the circuits that control the beam deflection, but more likely it is a power supply issue. I'm sure it can be fixed, but undoubtedly it would cost more than the TV is worth.

The HDTV market is a lot more mature now than it was even 2 years ago. We are on the 4th or 5th generation of ATSC digital tuners, LCD, DLP and plasma displays have improved tremendously and CRTs (direct, FP and RP) look better than ever. There are a couple of new technologies on the horizon, but they won't hit the market (at least not at reasonable prices) for at least a couple of years, possibly longer.

IOW, there really is no reason to wait, except perhaps for budgetary reasons. You do want to make sure you get a display with at least one HDMI input and that is 720p or 1080i capable. If it is a CRT it should also be able to display 480p natively. The big questions are going to be: how much do you want to spend; what size screen do you want; how big a footprint will your SO accept. Posted Image

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#3 of 13 RustyD

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Posted December 16 2005 - 03:00 AM

Well of course I don't want to spend to much to fix. Any easy ways to diagnose/fix DIY? I know my Panamax is gone/going because all lights on voltage meter are lit up! too but I have plugged tv into wall and it still has problem. SO now I will leave tv on if I will be watching it in the same day.

As for the new TVs it seems tuff to get it all without paying for it. Don't we all want 1080p in our sets and DVR's? Also EDTV capabily too? 720p & 1080i I interpret to be the same picture quality if I have been reading correctly honing up lately. I would like to only spend around $4k or less. Have been looking at LG - 50PX4DR DLP for$4,500.

#4 of 13 willyTass

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Posted December 16 2005 - 03:03 AM

AT THAT PRICE I'D HOLD OFF TILL MID NEXT YEAR WHEN TOSHIBA SED ARRIVES

#5 of 13 RustyD

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Posted December 16 2005 - 03:11 AM

What is that?

Thats why I want to wait about a year because I know that price would be down another 1k by then.

#6 of 13 MikeGee

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Posted December 16 2005 - 11:59 AM

The Toshiba SED is a new type of screen that is apparently superior to DLP, LCD, and Plasma.

http://www.engadget....32841184005838/

I wish I had that kinda budget for a tv. My piece of junk 27" Sanyo is dying a slow painful death.

#7 of 13 Steve Berger

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Posted December 16 2005 - 12:18 PM

RustyD, your symptom is a vertical output problem (and has nothing to do with the tube itself). It is very common and is the result of some capacitors in the vertical circuit deteriorating with age. As long as you get it fixed before any active components fail (like the output IC) it is generally a $50 - $75 repair. If the output fails, then add another $25 - $50 to the repair. There is always the possibility that the IC has a thermal failure already, usually meaning a $75 - $100 repair; but the capacitors are the typical fault.

#8 of 13 willyTass

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Posted December 16 2005 - 04:56 PM

cross out "apparently"

#9 of 13 RustyD

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Posted December 20 2005 - 02:35 AM

I also forgot to mention the controls do not work for a few minutes. Remote or on the set. I f I press a channel, it will switch like 3 minutes later!?

#10 of 13 RustyD

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Posted December 20 2005 - 02:40 AM

SED???????? Here we go again, but if it comes out next year it may be a few years for the kinks and price to be lower.

#11 of 13 Steve Berger

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Posted December 20 2005 - 12:36 PM

Quote:
I also forgot to mention the controls do not work for a few minutes. Remote or on the set. I f I press a channel, it will switch like 3 minutes later!?
Probably related (possibly?) ; the microprocessor needs vertical feedback to operate correctly (the micro performs many of it's actions during vertical blanking so noise does not appear on screen) and the vertical signals are all messed up.

#12 of 13 RustyD

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Posted December 21 2005 - 12:49 AM

All weird things are going on now. I have to narrow things down and work thru it. Now the system shuts off sometimes and sometimes the amp doesn't come on. I am waiting on my line conditioner to come in so I can replace that, then to the receiver and TV. Ughhh, when it rains it pours!Posted Image

#13 of 13 willyTass

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Posted December 22 2005 - 02:27 AM

There wont be any kinks ; toshiba and canon have been working on SED since the late 1980's.


As for price? It will be a porn star TV so they can sell it at what ever price they want.

Imagine a TV with the picture quality of a CRT pc monitor with perfect convergence, geometry and no colour purity problems. Fastest response time on earth. Best blacks .
Oh and 50" diagonal at 4 inches thick.

Leaves plasma/LCD for dead IMHO




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