10 years ? old 20" diag. toshiba tv (glass picture tube ?) has started showing only the top half of the picture.
There is a bright line separating the picture top and the "blacked-out" bottom --- it does not "float" --- and it is happening on all channels.
I read one of your other answers and thought you needed that info ...
Is this a problem worth trying to fix? --- I can't afford one of these newer tv's right now but I could put a little ! bit of money into this one if I could get a few more years from it. Please help!
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You can try cleaning the lens/mirrors of the set with a lint free cloth and a cleaning liquid made for cleaning glass. The dark image can sometimes be caused due to dust on these parts. If that does not work then I am afraid that you need to purchase replacement CRTs(the three tubes at the back of the set). Each of them produce one color - Red, Green and Blue and all 3 have to be replaced to resolve the problem, unless you can visually identify a malfunction with one of the tubes(If one of tubes is a lot dimmer than the other 2).
U have tools like a soldering iron and a roll of solders u also can do basic soldering work too?Yes,take the tv aparts.The tv video board that the board where it is connect to the tv CRT-(tv tube) it have cold soldering on it round pins sockets video board that it connect to the tv CRT-(tv tube).The tv video board that the board connect to the tv CRT-(tv tubbe).Those socket pins around the video sockets pins must be to do resoldering for a tight connections between the tv video boaard round socket pins to connections for a good connections to the tv video board and to the tv CRT-(tv tube).This will solved video fading in and out and loosing video picture.
the vertical drive ic that drives the yoke for vertical sweep has blown.
sometimes it is solder problems like sharp and toshiba had.
the part is 10$ the pc board will label it ,the yoke is the coil setup on the picture tube.if you follow the wiring half goes to the horizontal drive,and the others to the vertical section.the chip drives the coil directly.there are VERY high voltages in there ,even turned off. the pix tube cap on top is 30000v. like a stun gun.the horizontal drive 2000 volts and the main power supply 165 volts dc high current.you need a special setup to discharge the picture tube.
keep tv off.
it will only get wors
if sumon dosent work on it soon
the problem you are having in the vertical section of the tv
hav a repairman resolider all conection on the vertical IC and check the serounding componets for falts.
PS the repair takes me about 15 min.
The problem is probably a faulty IC (chip) or capacitor on tv main board.
Only simple things you can do at home are hard reset and whacking test. To do hard reset leave the power cord unplugged for two hours; then power up again. This will drain power from tv and will restore all eproms inside the set to factory defaults.
to do whacking test. Just bang (not too hard) your fist on the top, back, sides, etc., to see if you can restore the picture, this can fix bad connectors etc.
and the whacking doesn't help, then the problem is in some faulty or burnt component on main pcb inside tv. Often the jungle IC
chip. The jungle IC handles all the
video, color and control signals to the projection tubes. It is quite
expensive to replace. In this case you will need a tech to test and diagnose the
exact failure so that the right outboard parts are replaced at the same
The set should be nearly 10 years of age; so, it should have a few years of
life left in it, as average life for a Toshiba is around 15 years . So, if you have to spend $300 to fix
it and you get another 5 years of life or so out of it, it may be worth repairing, as the only other option is buying a new TV.
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.
There is not much for me to go on with your description but here goes,
I suppose you have a convential TV set with a glass picture tube and not one of the new types with the large screen slim style displays!!!
If it a glass type picture tube then the following assumptions are made.
I hope yopu have not shifted house recently and moved the TV around???
If you have its possible the Yoke (its a device on the neck of the Picture tube that controls magnetically the scanning dot) may have moved and only is letting you see half a picture...
This is a long shot but it could be the cause..
Now the picture is supplied to you by a fast moving dot of light (Black & White set) that scans from the top of the picture and moves very fast down to the bottom of the screen, then flys back to the top of the screen and starts all over again during this process the dot lights up the picture tube to provide you with
the picture you see... (On a colour set there are three dots)
Its quite a complex process and its all controlled by electronics inside the TV receiver.
If you are getting only half a picture then something is causing the dot to only turn on for the lower half of the picture during its write time to the glass screen,
You dont say if the half thats off is white or black, so there are many things that the service technician needs to know before even starting to look for this fault. During the dot doing its write cycle down the sceen, when it reachs the bottom and flys back to the top of the screen it receives a synchronous pulse from the TV station, and this TV signal is critical in making sure you see the same picture as is being sent from the TV station.
Sometimes this sync pulse from the TV station is very weak and so your picture may float up and down the screen trying to lock to the incoming signal.. this just may be your fault.. but you dont say if the half of the picture that you see is floating or not..
Your situation may be that your TV has partially locked to the station signal and your aerial may be problematic,
but then you dont say if its on just the one channel or all of your station channels. So there needs to be more analysis of your situation prior to a positive answer being provided....
It is a 20" TV set and will most likly, im afraid to tell you, cost more to fix then it is worth. The problem is a bad Picture tube, an intermittant CRT socket or the video jungle IC is intermittant. If you want to invest in an estimate, check out first if it will go towards the repair, as then maybe you can get it fixed at a good price, as long as the picture tube is not the problem Good Luck