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#1
05-06-2009, 05:27 PM
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Zenith Sentry 2 hoz lines and whine
Hi all,
This is my first post in this forum, I have been active in the audio side but I come to you with a question. I have a Zenith Sentry 2 Television console (type). that I picked up from a thrift. It worked great, looked like the ones my ma and dad had when I was a kid, but after 6 months there are some horizontal lines that plague my screen and high pitched whine from the flyback or yoke I cant nail it. When the screen is black there is no issue. Just to note I am rather competent with audio and xray equip and have my 10000 v protective gloves to no worries about discharging the crt in my "ground"-- but do you think this is salvageable. I have other sets in the house but this one is my favorite to sit in front and do my admin work. Can anyone give some guidance? Thanks Rogers
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#2
05-06-2009, 08:31 PM
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If you can give a model number, I may have a schematic. On some of those, there was a small electrolytic cap going from pin 2 of the jungle IC to ground that would cause the problem.
A word of warning: I'm not knocking your TV; but, I wouldn't spend much time or money on this set because the CRT's are not known to last long. They will short at the drop of a hat and blow out the power supply and/or video output circuit. Also, the emission will often fall off, causing color problems. This rule applies to most all '90's Zenith's, especially '93 and later.
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#3
05-07-2009, 05:37 PM
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Thanks for the reply, the model number is SJ2726EW5, I will try to fix it as I have a bunch of electrolytic in variable voltages. Heck this may be a start of a new side of my hobby.
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#4
05-07-2009, 10:10 PM
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Echoing radiotvnut. Kinda works like this...
*USER* Hi I have a 1990's Zenith... *AKers* NOOOOOO!!!! *USER* It has a non Zenith CRT... *AKers* YAAAY!!! But yeah. While I have a 1998 Zenith that's holding up well so far, I recently sold a 1994 Zenith that had a rebuilt CRT from 1996 in it... I had to max out the red and green gun controls to acheive a white balance, and the red was still a tad weak... I also have a 1997 Hitachi, which has Zenith guts and a Zenith CRT... picture's tinted green and it has poor convergence and bad color bleeding.
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#5
05-07-2009, 11:36 PM
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When it is working the color is ok, I figure I have all the test equipment and some components, if I can fix it then it will be an accomplishment. Since it is here it will be an intro of sorts and I can kind of study of of the theory some more. I have been rebuilding older Marantz receivers and building tube amps and I need a break from building audio for a bit.
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