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No way, man.Papabravo said:High voltage power supply. It generates the voltage applied to the vertical deflection plates.
Ron H said:My wife just called and told me that when she turned on our 15 year old 31 inch Mitsubishi TV, it made a loud pop, flatlined (no vertical deflection), and started stinking. Where should I start looking if I decide to try to fix it?
That works for me. So I would guess you could start there and work backwards.audioguru said:The vertical deflection IC in my Sony 32" TV is powered by +12V and -15V. It has a voltage-boosting diode and capacitor connected to it. Its output to the vertical deflection coil is 57V p-p.
My understanding HDTV screens can display 4:3 NTSC video, but the sides will be gray, or the picture will be stretched horizontally. I'm not sure I want to deal with that, but on the other hand, I guess a new NTSC TV will be obsolete in a couple of years.Optikon said:I suppose its worth a try to fix for a spare. But if it were me, I'd look at this as an opportunity to upgrade my set. Especially now with the HDTV craze going on. If you replace something obviously broken and it keeps having trouble, will it be worth your time to chase the issues down?
They said that years ago. It didn't happen.Ron H said:I guess a new NTSC TV will be obsolete in a couple of years.
In the US, analog TV will be switched off by Feb. 17, 2009. All broadcast TV after that date will be HDTV with a 16:9 aspect ratio, which will have to be stretched or letterboxed when displayed on a 4:3 screen. That's what I mean by obsolete.audioguru said:They said that years ago. It didn't happen.
Since they're going to auction the spectrum for billions and billions, maybe enough to make a dent in the war debt, the winners will be understandably cross if the government renegs.Ron H said:In the US, analog TV will be switched off by Feb. 17, 2009. All broadcast TV after that date will be HDTV with a 16:9 aspect ratio, which will have to be stretched or letterboxed when displayed on a 4:3 screen. That's what I mean by obsolete.
Good idea!Papabravo said:Since they're going to auction the spectrum for billions and billions, maybe enough to make a dent in the war debt, the winners will be understandably cross if the government renegs.
My Sony has 5 display modes for different aspect ratios as the nature of the signal changes. I like NTSC broadcasts in "Wide Zoom". Go down to a "wall 'o screens" store and ask the clerk for a remote and tell him to leave you alone for a while so you can futz with it.
Good stuff, HiTech. If the vertical deflection chip failed,I'm worried about what caused it. What else should I be looking for?HiTech said:RonH
If you have a white horizontal line on the CRT, then you still have high voltage circuitry operating properly and it's the vertical deflection chip that's likely the culprit. I have serviced many a vertical collapsed Mitsubishi big CRT set. Easy to locate chip, often attached to a heat sink and they are pretty good that outling the vertical section on the pcb with a label. It's typically an LA3xxx or similar chip that sells for just a few dollars. You may ned to get into the service menu after its replacement to adjust vertical linearity/size. Some of those vertical chips actually blow a hole in them and emit a slight burn odor.
ps: discharge that anode connection to ground on the crt before you go probing around in the chassis!