I have a Toshiba 32" Pro logic tv model number 3357db which has lost its full colour leaving a green picture I have tried adjusting brightness/colour etc with no change, any ideas?
What will it take to fix?
Can we do it ourselves?
How much will it cost?
It is a UK product approximately 12years old
Many thanks Ju
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Re: loss of colour
With the set being 12 years old, I'm sure the picture tube is near the end of its useful life. You probably have a defective semiconductor, either an IC or transistor that has gone up giving you no color, but with the green picture, it is not likely worth repair.
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In my opinion, you should not have to give them the remote number, but you can look this up by contacting the customer service website of Toshiba, giving them the model number of your tv..and explaining your situation...also check eBAY for remotes.
A good TV repair shop should be able to repair this but given the current price of flat panel TV's you might want to think about scrapping it. I was a little confused about your description of the fault, one colour disappearing is in a very different area of fault from all colour disappearing. Does it flash into correct colour momentarily if you fine tune it? Is the picture as far as you can tell black and white or does it have a strong colour cast on it where everything is for example reddy or bluish etc? I hope I have been of help but please do not hesitate to ask if you have any further questions. I appreciate your vote if you appreciate my reply.
have JVC AV-32F702 TV. It's picture color is very red. unable to adjust colors through menu. Channel numbers are also in red now instead of normal green. any suggestion?
please check red color cathode circuit
1 check red output from ic to red cathode ckt
2 check voltage on r output ckt& ic or tr.
3 check loose contact in red cathode ckt
4 check crt base for loose.
5 loose connector
6 chroma ic
Toshibas are notorious for developing shorts in the inernal guns of the picture tube. In your case the green gun is shorted to G1. The noise you heard was an internal arc between the elements.
It is unfortunate however, the repair of this problem usually requires the picture tube to be replaced. Sometimes a savvy technician with sencore picture tube rejuvenator can remove the short. This however usually does not last. Scrivitron
The green gun in your picture tube is set a little too high.
If you are experienced in removing the back cover of TV's,etc., you may try to find the drive and/or bias controls either on the circuit board that plugs on to the neck of the picture tube or mounted on the main circuit board of your TV. These controls are usually labeled. If you can find them, locate the green bias or drive control and back it down a little while watching the picture through a mirror. A slight adjustment may correct your problem.tJIS IS CALLED GRAY SCALE ADJUSTMENT.
BE CAREFUL THERE ARE SOME HIGH VOLTAGE CIRCUITS NEARBY. WORK WITH ONE HAND AND USE AN INSULATED TOOL TO MAKE ADJUSTMENTS
I hope this may help you.AGAIN BE CAREFUL!!
this symptom is characterised by the loss of one or two primary colours. this symptom can be classified into three cases: 1) loss of red colour, 2) loss of colour blue,3) loss of green color. this symptom may be caused by a trouble in the colour demodulator, in the color amplifier or in the colour subtraction amplifier circuit. in your case loss of blue colour. this is a very complicated problem that you need some special test equipment like oscilloscope and color pattern generator in order to trace the signal. tune the receiver to a color broadcast station(a colour bar generator can be used to transmit a colour signal to the set). check the Z-axis demodulator, z-axis amplifier and the B-Y output circuit for the chroma signal. observe the signal process with an oscilloscope. if the color signal is not present use a VOM to locate the defective component in any of the above circuits. check the transistors and the resistors in the collector circuit. good luck!
My first inclination would be to check the picture tube, especially if the set is over 7 years old. If it is not that, then anything from bad solder connections to capacitors or a defective IC could be the cause. If it's over 10 years old, replace it. No use flogging a dead horse.
If im not mistaking I remember the toshiba 32" to have an on screen alighnment in the sevice menu.. and I would not recomend that anyone without the proper manual and tools to fool with these adj as I've seen in the past that a set had to be completely redone even the tuner alighnments after someone went in and tryed to adj the set., Now the green tinge you speak of is the CRT getting weak The best way to ajust this would be to see if on the picture tube pc board on the end of the Picture tube if it has any little control on it ? if it does look for the green drive and put on a b&w Picture. slowlty turn down the green drive control untill the pic look almost B&W and you probably wont be able to get perfact grey scale as the crt is weak . If theres no controls on the crt pcb then your gonna need a service alighnment manual and adj the green drive that way. Good Luck