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Re: Av123 MFW-15 power supply problem
Well, installed the new fets, it turned on than 20 seconds of being on it started to have a high pitch hiss and popped the fuse, replaced the fuse and I'm back to instant popped fuses. Runs fine green light stays on, with fets removed..... Any ideas? :/
EDIT: even with the power switch in off position it blows a fuse when power is applied and the new fets are blown...Last edited by xXDigitizerXx; 03-01-2018, 02:10 PM.Comment
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Re: Av123 MFW-15 power supply problem
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Re: Av123 MFW-15 power supply problem
I just got one gave up me and having similar issues. Everything seems ok except for c1 and it is gone. I am looking for the value and type to replace. I'm new and going thru this forum I'm not sure if I missed it or if someone could help.Comment
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Re: Av123 MFW-15 power supply problem
I just got one given to me and having similar issues. Everything seems ok except for c1 and it is gone. I am looking for the value and type to replace. I'm new and going thru this forum I'm not sure if I missed it or if someone could help.
Anyone know what c1 disc cap value is?Comment
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Re: Av123 MFW-15 power supply problem
Hi Guys, my MFW15 recently died on me. I also had c1 blown up, it apparently very strongly. It also destroyed two of the underlying connections. Does anyone know the circuit layout of the power supply and help my redo the connections?Comment
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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.... -
Good day.
I have an AC/DC -> DC PWM (rectifier + 555 buck converter) power supply with MDF11n60, which is getting very hot.
The input is AC from a transformer and the output powers a 24v dc fan. The power supply is used to regulate the speed of the fan.
After several runs on the bench power supply I noticed that the mosfet is reaching 80+C*. The mosfet reads fine on component tester, the thermal paste is changed, the fan is cleaned and with freshly oiled bearings.
When powered directly from the bench psu, the fan takes ~0.7A on 12V. The current consumption is similar...
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