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Absolutely not worth repair. You have described a classic symptom of Zenith picture tube failure, and about 99% of the time the main board in the TV is ruined as well. You've gotten good life from the set (manufacturers figure tube life is around 7 years these days), so it's time to replace it.
I HAVE A 48" REAR PROJECTION (SONY) THAT WAS PURCHASED IN 1997. IT FINALLY WENT OUT LAST WEEK. PARTS ARE NO LONGER AVAILABLE UNLESS YOU WANT TO PAY A HEFTY PRICE. I AM NOT GOING TO REPAIR MINE AS IT IS NOT AFFORDABLE TO DO SO.
this is just the tuner and it can be replaced or it just needs some soldering but i fix these and i can tell you it sounds like the tuner is failing and needs replaced , the tuner can be about $80 and the repair can very between 50 -$60
hope this info is worth a fixya as other ratings only hurt our rating
and if you need more assistance I'll be glad to help
sitnlisten - yes it does appear your pix tube is getting weak,but we may be able to turn up the flyback alittle to brighten up the picture.If you take the back off you will see the flyback-large black unit with a wire going to the round rubber cap on the back of the pix tube.Look at the flyback there are usually 2 adjusters one marked focus the other screen,just turn up the screen a little bit at a time.If you turn this up too much you will wind up with retrace lines on the screen.You may also want to check the pcboard ass'y for a sub bright adjust,and same thing small adjustments.If this don't help your pix tube may be too far gone.I hope this helps. cooltek Feb.1/08
it's unual for all 3 crt's to go bad at same time, so have you tried turning up screen(G2) control? If so also there is a cap in the high voltage line that when replaced may lighten up set. Don't have model so I can't go further.
How old is the set? If picture is really very blurry, Try adjusting 'focus'. You can find this conttrol generally at the rear of the set.
Otherwise,. if you know solid state electronics, Check the Focus control on the FBT. It is also possible that the CTR Base is faulty. Replacing this helps.
Does not seem like a bad tube alone. Could also be that the Video output Transistors Supply Filter capacitor having dried out. It is a 100mfd 160V capacitor, which on replacement will improve the brightness of the immage. And yes, you could also try increasing the heater voltage (Filament Voltage)of the Pictuire tube, this will definitely increase brightness, but will reduce the life of the Picture tube.
You gotta think - 10 year old TV, should I repair or exchange and get a new one???