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Re: Corsair GS800 Power Supply Problem
Odd...Hooked to a 125watt desktop. Computer powers on instantly does not load windows and does not respond to the power button. PS acts as if it is in constant power on state. Voltages are all normal. Odd.Comment
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Re: Corsair GS800 Power Supply Problem
PG is only .0873vComment
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Re: Corsair GS800 Power Supply Problem
Probed the IC (WT7502) that provides PG signal. Does the problem look like an IC issue or a problem elsewhere? These values are from power on state-the only state I can get from the power supply (constant on) and green to ground no connection:
Attached FilesComment
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Re: Corsair GS800 Power Supply Problem
The power supply should not come on when there is nothing connected to it, if it does then something is telling one of the optocouplers to turn on the main primary supply I don't know which one it is but I suspect it is the one (U3?) just below the J22 letters. The other opto next to it is likely for feedback for the main supply, and the other optocoupler by itself, is feedback for the standby circuit.
If the power supply is in standby there should be no +12v,+5v,+3.3v going to the WT7502
The PSONB seems high, I would think it should be around +5v or less (the datasheet says max 7v)Last edited by R_J; 04-07-2020, 06:50 PM.Comment
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Re: Corsair GS800 Power Supply Problem
I think a valid PGI is more than 1.5V. I guess you have to trace that pin back.Comment
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Re: Corsair GS800 Power Supply Problem
Check that the power supply is in standby when not connected to any pc. If the main power supply comes on before the ic sees a PS/ON signal the ic might not detect the voltage properly and give a false errorLast edited by R_J; 04-08-2020, 09:51 AM.Comment
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Re: Corsair GS800 Power Supply Problem
Great fix so far!
But please attach photos to your posts.
I have attached the previous ones.
It is a great shame when a thread like this comes up empty without photos because the image-host has closed doors!"The one who says it cannot be done should never interrupt the one who is doing it."Comment
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Re: Corsair GS800 Power Supply Problem
My motherboard went out on my main PC the same day I got to this point.* RMA mode on that. Yeah Photobucket ruined a lot of these repair threads. Thanks for fixing the photos.
WT8502: https://cdn.badcaps-static.com/pdfs/...b7fe85fcd7.pdf
Tracing PGI circuit back-not far-I think I found another issue here...:
15.6v seems high going into the the resistor and cap that are in parallel, which then drops drastically at the cap (c75) and resistor (R67)? Measures 8100ohms across the the cap and resistor. If normal my PGI signal would be 15.6v. Believe spec sheets indicates max voltage of 7v. Bad cap or resistor? Pin under PGI is gnd on Wt7502.
*Next day was a Booster Coil in a Samsung monitor.Attached FilesComment
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Re: Corsair GS800 Power Supply Problem
the smd resistor marking is 9101? So it should measure 9.1 kOhms. A bad cap would read a short or some low Ohms and that is not the case.Comment
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Re: Corsair GS800 Power Supply Problem
The resistance is 9093ohm appears as I would expect-yes 9101, so why a 15v drop across the two? Leads back to the transformer (secondary side of course) that we originally discovered had a broken solder joint. When trying to check capacitance the meter just can't lock..keeps going back to OL then like .8uf and kinda bouncing back and forth. If the cap, how to speculate the value-size and 15v+ minimum?Last edited by ShortCircuited; 04-16-2020, 06:37 PM.Comment
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Re: Corsair GS800 Power Supply Problem
Put your finger on that resistor. Is it getting hot?Comment
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Re: Corsair GS800 Power Supply Problem
Where is the 16 volts coming from?Comment
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Re: Corsair GS800 Power Supply Problem
Main transformer that we fixed earlier in this thread...through a diode a resistor/cap (parallel).....long trace another resistor/cap (ones in image-parallel) then into the PGI pin.
One side of the transformer is 12.3 and the other is 15.6-both of which are on the secondary side of the main transformer.
Neg probe is the ground/blk wires on secondary side.
Red line (roughly):
Attached FilesComment
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Re: Corsair GS800 Power Supply Problem
So what voltage do you have on pin #1 ? While you are checking, what are the voltages on all 7 pins? I believe pgi voltage is quite low but needs to be above 1.2v.Last edited by R_J; 04-16-2020, 09:24 PM.Comment
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Re: Corsair GS800 Power Supply Problem
Pin 1 of Wt7502 is PGI and it is 1.6
What is more problematic is that if the cap just before pin 1 is bad then Pin 1 would receive 15.6 volts if corrected and the max voltage is 7 according to the spec sheet for PGI for WT7502.
Correction to post 51: 14v drop not 15v drop.Attached FilesLast edited by ShortCircuited; 04-16-2020, 09:27 PM.Comment
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Re: Corsair GS800 Power Supply Problem
pgi of 1.6v should be ok, it is above 1.2v (I did'nt see the <.> in the post# 49 picture)Last edited by R_J; 04-16-2020, 09:32 PM.Comment
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Re: Corsair GS800 Power Supply Problem
.08v good for PGO?
Connected to PC and it would not boot to windows...black screen despite voltages 3.3v, 5 and 12 all present.Last edited by ShortCircuited; 04-16-2020, 09:42 PM.Comment
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Re: Corsair GS800 Power Supply Problem
NO, The ic does'nt just rely on the pgI input pin to give a pgO, highComment
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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... -
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.... -
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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