|
#1
|
||||
|
||||
Run capacitor replacement
Okay, my daily watcher has been acting up lately and I think the run cap is on its way out. I pulled the back of the set and felt it; very warm, bordering on hot. It's a 3.5 microfarad, 440VAC oval can. I've been checking around and the closest oval can run cap I can find is 4 microfarads. I'm just wondering if one of these would be a suitable replacement.
|
#2
|
|||
|
|||
Dumont set?
|
#3
|
||||
|
||||
Or a Zenith Duramodule set? They used a ferroresonant supply with the cap. I my have one or two old-stock.
__________________
Brian USN RET (Avionics / Cal) CET- Consumer Repair and Avionics ('88) "Capacitor Cosmetologist since '79" When fuses go to work, they quit! |
#4
|
||||
|
||||
For the Zenith colors IIRC they are all the same.
Probably the same on other brands too. Symptoms are if opened pulsating pix. Shorted fast breaker pop. 73 Zeno LFOD ! |
#5
|
||||
|
||||
The capacitor used with a CV transformer forms a resonant circuit with the winding driving it. The value is critical to proper operation, so I would really suggest finding a 3.5 uF if at all possible.
|
Audiokarma |
#6
|
||||
|
||||
Oh, I didn't know the type of TV mattered. It's my 1976 Electrohome C31 chassis console.
Seems to be a popular value for ceiling fan box-style capacitors, but oval cans are practically non-existent. Yup it pulsates a bit, mostly noticeable when looking closely at letterbox presentations. Often times it will pitch a fit and brightness will go down and back up repeatedly. Sometimes the picture will tear a bit. It was well-behaved for most of last night though. Last edited by Jon A.; 08-25-2017 at 04:08 PM. Reason: Removed outdated link. |
#7
|
||||
|
||||
A separate winding and a two amp fuse for a couple of pilot lights ? Strange ....
|
#8
|
||||
|
||||
Quote:
I have an old stock Zenith - it comes with a mounting clamp as well.
__________________
Brian USN RET (Avionics / Cal) CET- Consumer Repair and Avionics ('88) "Capacitor Cosmetologist since '79" When fuses go to work, they quit! Last edited by Findm-Keepm; 09-29-2017 at 06:39 PM. |
#9
|
||||
|
||||
Quote:
Ahh, so that's why there's a separate winding. This set has an "Instavu" switch on the back. I have it turned off though. |
#10
|
||||
|
||||
Nah - They are hermetically-sealed and oil filled (hence the "no PCBs" label), and are not affected by aging as much as an electrolytic. These types of caps are in most every home air conditioning system - the one in my Rheem gaspack right now is a Zenith cap - put there while troubleshooting a no fan start problem (Cooling coil would freeze up). I swapped in the Zenith cap to replace a 4uF cap, but the problem turned out to be bad solder joints at a molex connector on the system control board. I was hot, so a quick resolder and then I buttoned it up once it was going - the Zenith cap left in the unit.
__________________
Brian USN RET (Avionics / Cal) CET- Consumer Repair and Avionics ('88) "Capacitor Cosmetologist since '79" When fuses go to work, they quit! Last edited by Findm-Keepm; 02-07-2017 at 09:57 AM. |
Audiokarma |
#11
|
||||
|
||||
Right on, and it will be good to know the Zenith part number in case the replacement ever goes bad. After all, this set is ran several hours a day.
PM sent. |
#12
|
||||
|
||||
Those Zenith Chromacolor II can capacitors (22-7126-01) are available from TEDSS.com. The only place I've been able to find them. It looks like Zenith contracted those out to York air conditioning. TEDSS says they're slightly dented. The two I ordered had tiny dents like there were a bunch stored loose in a big box, not crushed or anything.
http://www.tedss.com/2020038517 |
#13
|
||||
|
||||
Quote:
Last edited by Jon A.; 02-23-2017 at 04:23 PM. |
#14
|
||||
|
||||
Quote:
Vertical lines are usually a horizontal problem, video problem, or bad filtering effecting one of those stages.
__________________
Tom C. Zenith: The quality stays in EVEN after the name falls off! What I want. --> http://www.videokarma.org/showpost.p...62&postcount=4 |
#15
|
||||
|
||||
"Thanks! I ought to get a couple of spares eventually. If my 23GC45 has one - I haven't looked closely yet - that's probably going as well. Right now my Electrohome has a couple of vertical lines on the screen at all times. The Zenith gets one on the right that goes away after a few seconds."
__________________ My 25GC45 has one, yours is the 23" version of the same chassis, so I'm sure yours does too. The value of the capacitor in those ferroresonant transformer is important, so you really need to get the right one. It's not a standard motor-run capacitor value, the first place I looked for a replacement was electrical and HVAC supply websites. That TEDSS site is the only place I was able to find the correct part. The cap in my set shorted out without warning after the set was on for a couple of hours. It'll pop the circuit breaker on the back when it shorts. I replaced it with a cap I had from a parted out set, but who knows how long that one will last. Last edited by wb2mep; 03-24-2017 at 01:35 PM. Reason: Forgot to quote post I was replying to |
Audiokarma |
|
|