Fresh off my success with 2 Hanns-G 28" monitors, I'm tackling a 32" ProView TV/DVD combo set that the power ligh lights up blue, then flashes. I have replaced all the capcitors on the power supply, which is a SIPS32V8P Version 2.0 power supply. I had a problem with the 5VSB circuit, and now it is solid. This power supply uses 5V and 12V only. There is an LED on the PS that lights up for about 2 seconds and goes out. The 5V mains are solid for those 2 seconds, and then go back to 0. The 12V however, only reads about 2 volts and then drops back to 0. I cannot find a schematic for this supply, but I do think that there might be an issue with the 9N50CF MOSFETS now. But I'm not sure. I'm trying to find a cross reference to see if there is a NTE cross-over that my local electronics house might have to try that. Anyone have a cross-reference for this? I can get the originals from Mouser, but it will take a few days to get them. I might pick up 4 if I have to go that route. I did remove the inverter transformer to see if the 12V mains came up to full voltage with it removed, and they did not, eliminating that as the problem dragging down the voltage. Any other suggestions as to where to look for a problem? I can link to a picture of the power supply but I don't have a picture of this power supply itself.
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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... -
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... -
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... -
Hi all, I just need to know that, can i use SMPS type power supply to test and short circuit detection on a laptop motherboard?
I saw 95% of repair guys are using only Linear bench power supply. linear bench power supply is pricy, thats why i planned to get one SMPS supply.
i know that in linear power supply the noise will be very low comparing to SMPS supply....