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Old 06-15-2014, 10:05 PM   #271
timhbtr53
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Have a bad power supply?

I'm sorry but this prices for a S3 power supply is just crazy. If you do not feel like you can replace the caps please send me a PM. I am in Baton Rouge, La. For just the shipping of the power supply and the caps from mouser "For all the caps it's about 10.00 bucks plus some shipping to get them here" I will replace your caps test it and send it back to you. I am not looking to get rich just help others out that can't do it themselves. If you think it worth 10 bucks great if not just make sure you pay the shipping back to you. The only thing I ask is please check your hard drive first. If it's good look at the caps on your power supply if they look like some of them have domed tops you have bad caps. If you have never had them replaced your going to have this problem. It's nothing TiVo did it was a line of junk caps that where used in everything. I have a radio telephone license, plus I am a ham radio oper. I have 2 weller soldering stations plus 2 Aoyue stations and a X-Tronic Model #5040-XTS Hot Air Rework Soldering Iron Station. So if you have a dead or dying power supply PM me. Thanks Tim.
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Old 06-16-2014, 10:22 AM   #272
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Originally Posted by bleech2 View Post
Since replacing the caps in my AcBel power supply a month ago, I've had two random occurrences of the video going blank when I press the Tivo button while watching live TV. The sound and functionality remain, but I can't get the video back unless I unplug the unit to force a restart.

While replacing the caps, a layer of the circuit board separated ever so slightly adjacent to one of the new caps. Could this be the cause?
Update: I opted not to mess with the power supply any further because I discovered that if I hit the "Live TV" button after the video goes out and then change the channel, the video returns without having to force a reset.
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Old 06-16-2014, 11:26 AM   #273
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Originally Posted by bleech2 View Post
Update: I opted not to mess with the power supply any further because I discovered that if I hit the "Live TV" button after the video goes out and then change the channel, the video returns without having to force a reset.
Have you checked the voltages -- this behavior isn't normal (unless your system always acted this way even before the PS went bad).
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Old 06-16-2014, 06:48 PM   #274
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Don't give up

Quote:
Originally Posted by bleech2 View Post
Update: I opted not to mess with the power supply any further because I discovered that if I hit the "Live TV" button after the video goes out and then change the channel, the video returns without having to force a reset.
Did you do the cap job? If so did you replace all the caps or just the pop topped caps? It sounds like you have a cap that is on the edge and your voltage is noisy. What series is this TiVo? If you pull the power and your back up it does sound like you have some low voltage on you power supply. I am wiling to help you if over the phone that's fine. Let me know if you would like some help but don't give up just yet.
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Old 06-16-2014, 07:56 PM   #275
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Originally Posted by timhbtr53 View Post
Did you do the cap job? If so did you replace all the caps or just the pop topped caps? It sounds like you have a cap that is on the edge and your voltage is noisy. What series is this TiVo? If you pull the power and your back up it does sound like you have some low voltage on you power supply. I am wiling to help you if over the phone that's fine. Let me know if you would like some help but don't give up just yet.
bleech2's tale of woe begins on post #255:

http://www.tivocommunity.com/tivo-vb...0#post10107710
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Old 06-16-2014, 08:26 PM   #276
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Oh a trace that walked.

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Originally Posted by squint View Post
It looks like C501 is bulging. Other pictures in that auction also show it bulging.



True, but when was the last time you saw a re-capped power supply for sale other than on this forum?
I hate when that happens, As long as you take your time it's a very workable fix "Like you don't know that" lol. That is a strange problem it sounds like one of the caps is on the edge and making noise on one of the voltage lines. I hope he takes it out and looks it over one more time. I think he will find a cold solder joint or cancer on a cap. And yes there seems to be a lot of high price P/S on here. Have a great week buddy.
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Old 06-28-2014, 11:07 PM   #277
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True. A polarized electrolytic capacitor can explode if installed backwards.
There's no "can" to it. They pop like a firecracker. I put one in polarity wrong tonight, and didn't catch it until it was plugged in and popped. I knew instantly what I had done. Everything was fastened down tight, all the cords were run back, and it was completely reinstalled in the entertainment center, which is odd, I'm normally pretty fussy about testing anything that can be tested while still in a state of partial disassembly.
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Old 07-15-2014, 06:51 PM   #278
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Bump.

I think I got a bulging capacitor on the power supply. How much bulging are we talking abou? The end is a bit convex while the others are concave...
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Old 07-15-2014, 07:05 PM   #279
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Originally Posted by Gregor View Post
Bump.

I think I got a bulging capacitor on the power supply. How much bulging are we talking abou? The end is a bit convex while the others are concave...
If it is convex at all, it's suspect. They start failing before they even get to that point (takes time for the pressure to build). If the center is any higher than the shrink sleeve that folds over the top edges, I'd call it doming, or "bulging" as they say in these threads. Probably a unitronistic dialect that stuck...
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Last edited by nooneuknow : 07-15-2014 at 08:51 PM. Reason: typo
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Old 07-15-2014, 07:43 PM   #280
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Thanks!
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Old 07-16-2014, 03:58 AM   #281
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Quote:
Originally Posted by Gregor View Post
Bump.

I think I got a bulging capacitor on the power supply. How much bulging are we talking abou? The end is a bit convex while the others are concave...
The recently deceased steve614 provided us with an excellent photographic example of how subtle the bulge can be



http://www.tivocommunity.com/tivo-vb...33#post8824333


Anything other than an absolutely ruler flat top of the capacitor counts, and it's also possible for a cap to still be flat but going (or gone) bad.


Even if you don't currently have a power supply problem, as long as you've got the thing opened up, you might as well go ahead and replace all the usual suspects and save having to do it in a few months from now.
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Old 07-16-2014, 05:13 PM   #282
squint
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I encountered my first non-capacitor-related power supply failure yesterday. An AcBel power supply from a 652 failed to spin up the HDD but would power the fan and some lights. Swapping out the power supply got it running again. I did a quick check of the power supply and saw no obvious failed capacitors but I did notice that the large heatsink along with the MOSFETs and Schottky rectifier bolted to it had a lot of play. Re-soldering the heatsink and the 3 components bolted to it got the power supply working again.

I also saw my first 648 power supply without a bulging C701.
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Old 07-16-2014, 09:59 PM   #283
nooneuknow
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Quote:
Originally Posted by squint View Post
I encountered my first non-capacitor-related power supply failure yesterday. An AcBel power supply from a 652 failed to spin up the HDD but would power the fan and some lights. Swapping out the power supply got it running again. I did a quick check of the power supply and saw no obvious failed capacitors but I did notice that the large heatsink along with the MOSFETs and Schottky rectifier bolted to it had a lot of play. Re-soldering the heatsink and the 3 components bolted to it got the power supply working again.

I also saw my first 648 power supply without a bulging C701.
I've seen the heatsink fault as well. Due to the heat-sinking qualities (and other qualities) of a heatsink, the often minimal amount of solder that is there can crack in shipping, during handling, and just fail from thermal cycling (from periods of not having constant heat, from constant operation).
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Cisco tuning adapters should never be used inline (using the TA coax OUT port) to connect a TiVo, if MoCA is in use. Use a splitter w/PoE filter on leg to TA, use other leg for the TiVo. Enjoy!

Last edited by nooneuknow : 07-16-2014 at 10:10 PM. Reason: added (and other qualities)
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Old 07-18-2014, 02:38 PM   #284
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The recently deceased steve614 provided us with an excellent photographic example of how subtle the bulge can be
Deceased???
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Old 07-19-2014, 12:48 AM   #285
unitron
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Deceased???
http://www.tivocommunity.com/tivo-vb...d.php?t=518924

Also see

http://www.tivocommunity.com/tivo-vb...d.php?t=505388
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