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#16
08-26-2014, 09:51 PM
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Why not continue the discussion with the original thread? Seems odd to double thread the same set. Anyway, I'll look in the morning at what I have. My late father serviced Zenith TVs, and marked up many a Sams with symptoms/cure information. I seem to recall the Pincushion circuit in the early System 3's had a underrated pin amp transistor.
Maybe have the mods merge/move this thread with the original? Cheers,
__________________
Brian USN RET (Avionics / Cal) CET- Consumer Repair and Avionics ('88) "Capacitor Cosmetologist since '79" When fuses go to work, they quit! 
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#17
08-26-2014, 10:10 PM
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That was easy - for the SF2589W and F-line variants:
Always replace C3413 - 100uF 25V, while there, replace C3412 as well. Both tend to have high (>4 ohms) ESR. Check the solder on TX3251 and LX3201 near the flyback - sweep pulls in horizontally if bad connections. May also cause snivits if intermittent. "Snivits" is my Dad's word for disturbances in the picture like snow, but are sweep related. I dunno if it's a universal term.... C3407 also fails with regularity, causing a dead set..... 22 year old comments on a Zenith, hard to decipher. Hopefully something helps. Cheers,
__________________
Brian USN RET (Avionics / Cal) CET- Consumer Repair and Avionics ('88) "Capacitor Cosmetologist since '79" When fuses go to work, they quit!
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#18
08-27-2014, 05:33 AM
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The original thread was about getting it and how i got it, etc. This one was about a problem with it. I find that once you post about something and people read it, they usually dont drop back by to see if something has changed. In other words "hey he just got a zenith. Good for him. Nice tv." They wont come back. I usually post a new find, then sometimes i come back with a technical issue post. Two different things to me. You do seem to know your stuff. So theres no chance of this being a service menu issue? Parts definitely need to be updated then.
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#19
08-27-2014, 12:58 PM
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Unless someone got into the menu and played around, it's not likely a service menu adjustment. If it was a Thomson RCA, sure, but System 3's had their "always bad" list of parts to check. We'd replace them all, just to avoid the call back. The customer only paid for the bad parts, but got a TV back with many more parts replaced to ensure the set would stay fixed.
I've got the original service lit for your set - two copies.....on microfiche. The fiche subscription was way cheaper than paper, and came quicker. We had two readers and access to a reader printer at the university a mile away, so if we needed a hardcopy (rare), we had one. PM me your address and I'l send you a microfiche (actually three). Cheers,
__________________
Brian USN RET (Avionics / Cal) CET- Consumer Repair and Avionics ('88) "Capacitor Cosmetologist since '79" When fuses go to work, they quit!
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#20
08-27-2014, 02:37 PM
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Nice. PM sent.
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