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In Reply to: RE: CRT TV: "POP", then nothing. posted by grantv on April 28, 2010 at 22:57:46
> a sound that would make me think of what a picture tube would if it were to burst.Actually CRTs do not "burst". Since they have a vacuum, CRTs implode (i.e. that is inward, not outward).
Fuses no not make much, if any noise, when they go. A load "pop" could be from an electrolytic capacitor exploding. Was there any odor after the pop?
From your questions, you might not be comfortable opening up the back of the set.
Edits: 04/28/10Follow Ups:
Power supply related and/or capacitor.
Good point on the fuse itself. Thought perhaps that the fuse blowing might have caused other parts of the TV to react hence the noise? I didn't smell anything, but it sits in an alcove built into the wall, so any odor would have likely stayed in that area for the most part.
I'm fine opening the set and checking for a burnt out part. If it's a cap I'll pull and replace. I can't imagine spending any money at a repair shop however on this age of a set.
It makes me wonder why after "only" 12 years it blew in the first place. Something else downstream causing the problem? Whatever it is directly affected the power making me think it might be a simpler fix.
Now, gotta get somebody to help me pull a 185# TV to the floor. :)
> Thought perhaps that the fuse blowing might have caused other parts of the TV to react
No, it's the other way around. Component failures may cause the fuse to blow (and maybe other components before the fuse can react).
> it sits in an alcove built into the wall
That's good for heat buildup, and aging of the TV's components. That could contribute to its "early" failure.
> Whatever it is directly affected the power making me think it might be a simpler fix.
One of the few things you wrote that I can agree with.
You might be able to find the service manual online. Even if you can't read the schematics, there are descriptions on how to open up the TV. The power supply board is mounted on a tray that can be unlatched and pulled out for servicing.
> Now, gotta get somebody to help me pull a 185# TV to the floor
I've found it to be a lot more comfortable to leave the TV on the stand. Soldering boards at floor level is not as easy as having it on the stand. (Or is the alcove just a small opening above the floor for a TV rather than floor-level for a RPTV?
What is the model number of your TV?
Regards
Good point on the alcove, one I discussed with my wife in the winter when I noticed one particular area of snow would melt first. :) I have a 70's house with the semi-typical split level entry. When I bought the house it was only used for growing drugs, closed from both sides. So I popped the wall open and voila.
Clean up the seeds (the mini-grow was accessed from the top of the front hall closet), have proper electrical (not just a cord for weed lights) and cable run in and I have a TV spot. It has lots of space around the TV for ventilation, but perhaps I was still asking for trouble. Excuse the old picture...
Model number... something S35...? I'll try and find it.
Edits: 04/29/10
My last CRT was a 40" Mitsubishi. When I bought it I could pick it up and move it. As I got older I found that I could not. That's when I bought my first flat panel set. I gave the set to my daughter and son-in-law with the understanding they were responsible for moving it. The set is still going strong.
-Wendell
I remember probably exactly that 40" Mits, very nice TV. I think it was what I really wanted at the time but too much ca$h. All my TV's have been good, until last night. :(
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