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Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809 -
Re: Good cap for long term power supply
Now that we have tantalum, aluminum polymer, and niobium oxide caps with relatively high values, why not design a PSU that uses them in the secondary? Coupled with other really high quality components, I reckon the PSU could last for 100 years. -
Re: Good cap for long term power supply
Not sure how useful these would be for computer power supplies.
Computers don't use 500kHz frequencies now and don't have room to fit 20uF worth of capacitance in a DIP14 package (actually no, looks like the low voltage ones are either 5 or 9 individual caps in a DIP style package).Last edited by mariushm; 07-11-2013, 08:30 PM.Comment
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Re: Good cap for long term power supply
I've got some ultra-low ESR tantalum and organic aluminum (Not radial polymer caps you might be thinking of, they look exactly like other SMD tantalum caps but it's aluminum instead) with really high values... (4V 270uF and 2.5V 470uF). You're right about the higher voltage ones though, they tend to have lower values because of size restrictions.
Keep in mind that PSUs only use 3.3V, 5V, and 12V for the output rails. In theory, a relatively expensive but super-reliable sub-$500 PSU could be manufactured. If there's a market for a product like that or not is a different story. Would be an interesting experiment though, attach leads to SMD tantalums and see if it's plausible at all.Comment
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Re: Good cap for long term power supply
Tantalums don't have an extremely good lifespan, they are very sensitive to heat, and they usually catch fire when they fail!Muh-soggy-kneeComment
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Re: Good cap for long term power supply
It would be practical to make a power supply using only ceramic or tantalum capacitors, but it would cost a lot more. For which you could simply use more electrolytics which would get you more hours per buck spent. The only reason you'd presently use ceramic/tantalum on a power supply output would be if size is critical.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: Good cap for long term power supply
I love tantalum capacitors ... far away from anything I work on. They have some desirable characteristics ... but have the nasty characteristic of catching fire with certain kinds of failures. I've had PCBs damaged beyond repair by the things! I dislike tantalum and loath large form-factor SMT monolythic ceramics. The latter are such an ongoing pain that I call them "evil". Recently had a cracked 10KV MLCC in the compensation for a 4KV main O/P cause interesting driftiness.PeteS in CA
Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
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To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
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Re: Good cap for long term power supply
My latest work project has 8 large format tantalums on it. Policy is in that case to have a fused power source (in this case a 1.6A fuse for 3xAA NiMH in series) because they've had too many issues with them shorting and burning up.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: Good cap for long term power supply
Back in the late 90s Sun Microsystems banned using tantalum caps in their products.PeteS in CA
Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
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To kill personal responsibility, initiative or success, punish it by taxing it. To encourage irresponsibility, improvidence, dependence and failure, reward it by subsidizing it.
****************************Comment
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Vizio e601i-A3 - Has Sound and Display, But No Backlight - Bad Power Supply Board or Bad LED Bulbs ?I was given this TV from my great uncle. He said it just wouldn't turn on one day out of nowhere, replaced the TV, and gave it to me to possibly fix and use for myself.
Upon bringing it home and plugging it up, it showed a standby light.
I powered it on and without a flashlight, the display showed the "V" but the lighting is very dim, but visible.
The screen seems to blackout and stay black, but with a flashlight I can see the display.
With my Playstation 4 connected via HDMI, and running a game I can hear sound.
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I have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump
One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy... -
I have been working on this concept for quite some time now with limited success but recently I found a switching power supply that is setup for the voltage that this soldering station needs to operate at however it also needs part of the secondary circuit from the original switching power because you need several voltage rails
I once tried to get a ZD-915 desoldering station to work on a 18 volt battery power supply but unfortunately things did not go well but I did find a work around but I might try this idea again but going at a little differently more about this another time... -
The sub developed a constant popping every couple seconds from woofer and power LED flickering with nothing but wall AC connected. Connecting an audio cable didn't change anything. It doesn't play but a second or two of audio in between the pops.
Opened it up and discovered the power supply is making a faint clicking or ticking sound.
I measured the amp's output to the woofer and it pulses up to 50mv DC to be driver. The pulses coincide with the power supply ticking/clicking.
I measured the power supply output going to the amp board and it too has this pulsing. Voltage cycles... -
I have a 15 - inch Retina MacBook Pro from the mid - 2014 model. Here is the link: https://www.badcaps.net/forum/showth...light=820-3662 . The battery broke some time ago. After I removed the battery and plugged in the original power adapter, the MBP could boot up normally. However, when I checked with IntelPowerGadget, I found that the CPU speed was limited to 0.8 GHz, and it ran very slowly. Later, I found a solution on GitHub. There is an open - source project called cputune that can set the CPU running speed. So I can now run the MBP at full speed. But another problem...
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