We have had nothing but trouble with tv since we bought it. It has been in the shop 3 times. We have had the color tubes replaced twice and they are out again. I'm not sure which tube is bad now, but the picture has a green hue, ok if you watch the Increedible Hulk over and over...I don't want to pay a repairman to come fix it because the TV isn't worth it. I was wondering how I find out the part numbers for these so I can try to fix myself. Any suggestions?
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My first concern would be that, the picture tube is going bad. The problem you describe, tell me one of the color guns is shorting. In this case I would think the green gun is shorting. There are three color guns in the neck of the picture tube. They are red, green, and blue. Most of the time the green will short as it is powered heavily in most TVs. The next thing to check, is the small board connected to the picture tube. Look for any and all bad grounds on this CRT board. This is another big problem in all Tube type TVs. On this small board there will be three color output transistors, and resistors. These will many times run very hot and will create bad grounds over time. Check and resolder as necessary. If the CRT board does not fix your problem, replace the TV. Picture tubes are very expensive and will not be feasible for replacement. Search for a new TV. Thanks for asking and show all hands of support!
Sounds like the "purity" is off on your tv. This is caused by the
picture tube getting magnetized by a stereo speaker sitting too
close or by another object with a magnet. If there is nothing
magnetic near the set you may have to have the set demagnetized. A local TV shop should be able to do this for
you on a Carry-In basis while you wait, at a minimum price, but
call for an appointment first. This fix is for a direct view type set
only (using glass picture tube). Does not include LCD or Plasma
If you have experience troubleshooting solid state TV sets, you should be able to tell by a couple of voltage measurements if its a problem with the picture tube or the drive circuit. Simply take the multimeter and compare the base voltage of the green drive to the red or blue drive transistor. If the voltage is about the same, measure the collector of all three. if the green voltage on the collector is higher then the others, then theres an open between the drive transistor and the crt element. this could be an open resistor, a bad solder connection on the crt socket, or an open picture tube element. If theres no voltage there then your going to have to trouble shoot the drive circuit.
Something with the picture tube drive circuit or the picture tube its self has a problem AS I have stated before MANY times in the past, If your not a trained technician, then this is not a repair you should attempt to repair or experiment with for a repair. Find a reliable tech to assist you with this repair as theres too much HIgh Voltage in these set6s for you to be playing with it . Good Luck
Sounds like tyo me that the picture tube is getting soft on ya!!. Its a common factor that occours with all tvs but mostly with zenith. A service tech might be able for a small fee rejuvinate the picture tube but theres never a warrantee with this type repair. Its not something a user should attemp to do as theres hi voltage inside this set even on the tube socket after its ubplugged for awhile. Seek the advise of a repair pro to see how bad the tube is. Good Luck