I picked up a few older TVs today. One of them, a Magnavox/Phillips 32MF23ID/37, supposedly would eventually turn on if you played with it long enough. I suspected bulged caps in the PSU. When I got it opened up, there were two 1600uf 35V caps that were badly bulged. I didn't have any of the same size so I put in two 1000uf 35V caps just to test. I plan on picking up the correct ones tomorrow. It will now turn on, but will not turn back off all the way. When I hold the power button in, the set turns off but restarts as soon as I let go off the button. Would undersized caps do this or am I probably looking at a faulty power button?
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Last edited by johnboy1313; 02-13-2013, 07:34 PM. -
Re: Would undersized startup caps keep a unit from shutting off?
Philips would have chosen those caps for a reason -- no telling what significantly less capacitance would do.
P.S. 1500uF caps are not startup caps but output caps.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search. -
Re: Would undersized startup caps keep a unit from shutting off?
Well, I won't power it up anymore until I get the correct caps in. Thanks for the heads up. Just to answer the original question, it was a sticky power button.Comment
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Re: Would undersized startup caps keep a unit from shutting off?
I can't find 1600uf 35V caps local but I can find 1500uf 35V caps. Do you think that would be a problem?Comment
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Re: Would undersized startup caps keep a unit from shutting off?
Now that I mention it, I've been reading posts regarding this PSU this morning. I've seen one post that said that the poster's PSU had 1200uf caps there. I've seen one post that said 1500uf. I've even got the schematic and it shows 1mf (1000uf). It's looking like they may have just thrown in whatever was available. Is there a way to confirm that the 1000uf 35V caps I have in there now are OK to run?Attached FilesComment
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Re: Would undersized startup caps keep a unit from shutting off?
There is no such thing as a 1600uF capacitor unless you custom order it, which is unusual.
You need to look at the caps you removed, you did keep them right?Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Would undersized startup caps keep a unit from shutting off?
Yeah, I've got them on my bench. I'll look again.
I could be reading this wrong but it looks like Digi-key stocks them.
http://www.digikey.com/product-detai...FcdxQgodpWAAwgComment
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Re: Would undersized startup caps keep a unit from shutting off?
They are not low ESR, just standard caps. Odd, never heard of 1600uF -- may be some common industrial application. 1500uF+1800uF would be close enough, as would 1000uF+2200uF.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Would undersized startup caps keep a unit from shutting off?
I believe I do have a 2200uf cap in my spare parts bin. I also found two 1500uf locally. I'm going to double check the old caps first. It would be no surprise to me if I read the cases wrong. I don't hava a lot of experience but I have never seen caps with markings like this in any other TV I've opened. What do you make of my question regarding the schematic in post #5?Comment
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Re: Would undersized startup caps keep a unit from shutting off?
They would appear to be 1000uF caps, so replace them as such.Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Would undersized startup caps keep a unit from shutting off?
Right on.Comment
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Re: Would undersized startup caps keep a unit from shutting off?
Original caps were 1200uf, not 1600uf.Comment
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Re: Would undersized startup caps keep a unit from shutting off?
I'd advise 1200uF replacements then.
Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead!
For service manual, schematic, boardview (board view), datasheet, cad - use our search.Comment
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Re: Would undersized startup caps keep a unit from shutting off?
Too late, TV is in Southern Wisconsin now.Comment
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I know I've been a little scarce lately (like the last 2-3 years), but I'm still here and still doing my thing with fixing PSUs.
For today's considerations, I have a Seasonic B12 BC-550 [A551bcafh] 550 Watt ATX power supply for you (click on links for full size images).
https://www.badcaps.net/filedata/fetch?id=3591771
https://www.badcaps.net/filedata/fetch?id=3591772
It's a modern ATX unit with fixed (non-modular) cables and an 80-plus bronze certificate. Here's the label:
https://www.badcaps.net/filedata/fetch?id=359177... -
Hello,
First, I am a complete noob with high voltage stuff. I'm learning, but I need help by someone looking over my shoulder.
I recently came into posession of a Heathkit IO-4205 5MHz Dual Trace Oscilloscope. The documentation is copyright 1978. I'm told it works.
I opened it up to check the caps before I applied power, and found the following black caps and wanted to know what they were. They are on the power supply board. I was able to read the name and model and came up with, "Nytronics 162J-1, 0.1uF, 20% tolerance, 2000VDC."
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Hello!
I have two projects on my work bench. One is a friends dead JBL Xtreme speaker with a blown voltage regulator and corresponding bulged and shorted cap. That cap has clear markings so I know what replacement I need for it.
The other project however is a whole different deal. It's a Zoom 9000 guitar effect from the 90th that has developed a devil hound howl when there is no input from the guitar. I'm guessing caps problem. So, since I don't really use this effect anymore I thought it would be a perfect project to learn on.
I have studied the board and... -
Normally, I never post repairs this quick after I do them, because… I am usually very slow.
But today, I’m making an exception here. Why? No idea. Perhaps only because the repair details are still “fresh” in my head… which is ironic, given this is a 16 year old monitor that hardly anyone will care about today. It is new to me, though. 
I picked it up last November from someone on my local Craigslist. It wasn’t very close to where I live, but was close to a family friend that I had to go visit anyways. So after watching the posting on Craigslist for a few weeks and seeing it getting...
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I'm trying to repair two old VCRs, they both have bad caps. One has leaky ones, the other would barely run until I subbed in some caps from another power supply I had laying around (though they are the wrong values). This vcr works for an hour or two, but then the power supply starts whining and the picture gets lines in it. I didn't replace all the secondary caps, so another voltage might still be problematic, or the values I used are too far off.
I've been on mouser and digikey but the options are a bit overwhelming. I just need some new ones that will work. They don't need to be top quality,...
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