so I have this power supply in my computer that has provided me four years of great use. The other day I noticed my computer was off. Upon trying to power it up I get fans for a split second and then nothing. If I disconnect the main connector off the motherboard in jumper the green wire to the black the fan came on on the power supply and it worked but I tried it again and it won't come on it just makes a buzzing noise really quick and then shuts down. I tried a different power supply of my motherboard and there's no problem with the computer. I should know this working on plasma and LCD TVs but what causes a condition like this I don't see any bulging caps. Although I haven't really gotten into the power supply too much yet I'm suspecting a low voltage condition that caused the power supply not to want to work under load. Anyone have any ideas?
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Did I leave the soldering iron on? -
Re: rocketfish rf-700wps2 wont power up
not much point posting if you have not had it open yet. -
Re: rocketfish rf-700wps2 wont power up
Sorry. What I meant to say is its open but nothing out of the ordinary standing out.Did I leave the soldering iron on?Comment
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Re: rocketfish rf-700wps2 wont power up
got foto's?Comment
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Re: rocketfish rf-700wps2 wont power up
I'll post photos soon. I noticed this uses a Cm6800g ic. Wonder if the cap on the vcc pin went south. unloaded it seems to work okay but connected or loaded down it shuts down immediately. Nothing physically blown and all mosfets test okDid I leave the soldering iron on?Comment
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Re: rocketfish rf-700wps2 wont power up
most bad caps"look" o.k.Comment
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Re: rocketfish rf-700wps2 wont power up
Here are picsAttached FilesDid I leave the soldering iron on?Comment
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"Tantalum for the brave, Solid Aluminium for the wise, Wet Electrolytic for the adventurous"
-David VanHornComment
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Re: rocketfish rf-700wps2 wont power up
whata shit design, look at the small board on the far side with 2 small caps up against the heatsink!Comment
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Re: rocketfish rf-700wps2 wont power up
All is well now, PFC ciruit ok, recapped the monitor circuit, some moderately high ESR in a few lytics on the board. After confirmed repair, powered the PC up and had a 12v regulator go up in smoke on the mainboard (MSI model). replaced this from an old crappy HP/COMPAQ mobo. All works well now. Im on the computer typing this.
So probably what happened is the PS spiked the mobo and in turn seriously stressed a 12v switching regulator.Did I leave the soldering iron on?Comment
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Re: rocketfish rf-700wps2 wont power up
And yes stj on that board where you see the two capacitors up against the heat sink that was one of the main problems too much heat dried them out ESR when high causing the monitor ic to shut down prematurely. So yes. Shit designDid I leave the soldering iron on?Comment
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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... -
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 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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