I am having a problem where i turn on my tv and the tube will fire up but i get nothing out of it. the repair guy said it was vertical breakdown, but i dont think he is quite right. because usually with my experiences with vertical breakdown, you get a white line accross the screen, but you get audio still. im getting nothing, no audio, the entire screen lights up but i dont even get the channel in the corner or blue screen or anything.
for a while before this happened today it would do this same thing, but in a moment or two i would hear a click and the audio would come in and the picture would fade in as well.
so i am stumped. anyone have any ideas?
If the Tv turns on (power supply is ok), screen lights up (inverters are ok) but don't get a blue screen, menu options, source options, or audio, it's most likely the main board (aka Motherboard) is faulty. If a DVD player is hooked upto the TV, check whether you can get audio from that (change the source using remote), in such a case it could be a problem with LCD Interface board. My $3 is on faulty Main board.
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It sounds like the electronic ciruitry tha fire the Blue Gun of your CRT is not working. It could be as simple as a cold solder joint in the circuit (very common) or a malfuntioned component. I wouldn't advise repair by yourself due to the High Voltage and the risk of CRT Implosion. Any reputable PC or TV Repair Shop should be able to repair pretty cheap.
For a normal tv this is certainly not worth fixing. But given that there are few televisions now with built in full Dolby 5.1 Prologic and three Scarts then it's worth looking into.
My 28W8DB failed last year when the CRT tube developed a fault; normally the repair would be uneconomic as the spare part is no longer available but there have been so many perfectly good 28" widescreen tv's scrapped in favour of plasma/LCD models that it was easy to find a replacement tube and to fit it. I got the donor tv quickly from my local FreeCycle group.
28W8DB's are relatively scarce, but 28w8 (virtual Dolby) and 28w93's are not and much of the internal circuitry is the same as well if you need to replace a board. In the end, I subsequently fitted mine with a superior tube from a Phillips model which came my way after the the first replacement as the 28w93 tube was just way too soft. (Philips and Toshiba often supplied tubes to each other and the practice is common with other major manufacturers as well).
BTW: your tv is going into protection mode. It's probably overheating due to a failed component or simply due to being choked with dust which all CRT tv's attract. To avoid a potential fire you must ensure that you get this repaired before you use it again and certainly never leave it unattended on standby.
the picture tube is most likely not out. but there is a problem in the high voltage transformer part of the set( this is what fires up the picture tube). a problem like that can be just as expensive as a new picture tube. if it's not still in warranty it would be cost prohibitive to repair.
If it's between 5-10 secs, that's normal. You will turn the tv on and hear a loud (buzz/hum) that is the picture tube firing up, once it's fired up, it has a few more seconds until your picture comes up fully. That is about 5-10 secs from pushing the power button.
If it's taking longer than that, your picture tube may be going out.
I had a 36XBR250 and it took about 10 secs to fire up and show a picture, and it was 5 1/2 years old.