It is ordinary 12V 5A psu, everything measures ok, what could be problem?
https://youtu.be/-zwaUHZ2OCk
https://youtu.be/-zwaUHZ2OCk
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Re: What are typical problems with this kind of psu behaviour?
Let see the plastic housing for this power supply data plate
Also let see the front side and back side of the board close up
This power supply looks very familiar to some power supply that I have
Is this medical grade type power supply
If this is the type of power supply all the capacitors need to be replaced except the the main capacitor can left alone ——> these are very good switching power supply
I have quite a few of 5 volt @ 5 amp switching power supply and I always recap them the capacitors that they use are real crap
I also have a few 12 volt @ 2.75 amp one also
The photos are from the 12 volt @ 2.75 amp medical grade switching power supply
On second thought this might not be the same type of power supplyAttached FilesLast edited by sam_sam_sam; 04-28-2019, 10:31 AM. -
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Re: What are typical problems with this kind of psu behaviour?
Hmmm, OVP shut down and restart? The low cold resistance of the halogen bulb is tripping over-current protection?
Some of the solder joints near the board edge nearer the camera, roughly in the center of the board, look like they might have voids or cracks (a poor solder joint could open up if current passes through it).PeteS in CA
Power Supplies should be boring: No loud noises, no bright flashes, and no bad smells.
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Re: What are typical problems with this kind of psu behaviour?
try incandescent bulb .start with 20w and work up .Comment
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Re: What are typical problems with this kind of psu behaviour?
You should check the cold resistance of that lamp you are using, as Petes suggested it may have trip the over current protection.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=24809Comment
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Re: What are typical problems with this kind of psu behaviour?
You could use the whole "Diode gone wild" trick and essentially brush one of the leads on one of the halogen bulb contacts over and over quickly to help it warm up until it is lit/hot, then make the full connection.. that or don't go so janky and try something like an ntc thermistor between the bulb and the psu.. But what others have said on this one for sure.. most halogen bulbs have really low cold filament resistance. I'm using one of the 120v variety as a current limited supply on my bench right now. lol
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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.
Assuming... -
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... -
Hi:
I bought an ebay kit to assemble a linear power supply. The following one that is explained in this page:
https://www.qsl.net/z33t/dc_0-30v_0-3A_eng.html
The power supply seems to work, but I have the following problems I would like someone to help me.
1. The input must be about 24-26V AC. My idea was to reuse a 30VAC 160VA toroidal transformer. But with this input the output doesn't go from 0-30V......it remains with some mV. And I guess will stress/burn some components. Do you see any possible modification to... -
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...
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