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Re: Corsair GS800 Power Supply Problem
I also see Q7 has an insulating kit and Q11 does not, has it been changed to an insulated mosfet? I hope it's drain is not connected to the heatsink. or is Q11 an original and Q7 been replaced with something else?Last edited by R_J; 04-04-2020, 07:58 PM.Comment
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Re: Corsair GS800 Power Supply Problem
I just checked the pictures again and you are correct on the resistor, I also did notice that Q7 and Q11 are different, one is a full pack the other isn’t. There is insulating hardware on Q7, but either it is bad, or Q7 is bad. Do Q7 and Q11 have the same part number?Comment
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Re: Corsair GS800 Power Supply Problem
Q11 original if I remember correctly. Q7 was sourced from another PS
Removed Q7 and it is not shorted. Yes Q7 does have insulating mounting hardware. I will run an independent bench test on this and see if it is good.
It does appear .19 volts is making it through the transformer to the secondary side for the 12v rail.
Q7:
Q11:
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Re: Corsair GS800 Power Supply Problem
I would also check the resistance of the primary of the transformer, If you have +377v on D19 cathode, you should also have that voltage on D13 anode, and you do not.Attached FilesLast edited by R_J; 04-04-2020, 08:29 PM.Comment
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Re: Corsair GS800 Power Supply Problem
Feedback winding continuity.
Primary open.
Neg side of primary winding to feedback is 11 megaohm.Last edited by ShortCircuited; 04-04-2020, 09:00 PM.Comment
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Re: Corsair GS800 Power Supply Problem
When the original Q7 shorted it took the primary winding with it? Unfortunately, I don't think these transformers can be sourced reasonably cheap.
Here is the suspect as oriented from the board bottom-view:
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Re: Corsair GS800 Power Supply Problem
Have a close look at the wires that connect to the pins, sometimes it can break right where it connects to the pin.Comment
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Re: Corsair GS800 Power Supply Problem
Solder joints look good. Primary winding is actually two wires whereas the feedback is only one wire.
Curious. If I am getting .19 on the secondary side that suggests the primary winding broke early in the wind?
Is it possible to fix this transformer? If i could find the opening a small bead of solder would be an acceptable fix? It appears the outside is glued together:
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Re: Corsair GS800 Power Supply Problem
Check the primary winding to those pins that are cut off, I suspect there might be a thermal fuse in the primary. I marked where it might be, but it could also be between the other cutoff pin. check the resistance between those pins, the transformer might be fixable.
You posted a picture of the secondary side, But post a similar picture of the PRIMARY side. I might be able to tell if there is an imbeded fuseAttached FilesLast edited by R_J; 04-05-2020, 10:19 AM.Comment
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Re: Corsair GS800 Power Supply Problem
an open primary would do it alright. As RJ already said, check the thermal fuse in the primary, if it has one.Comment
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Re: Corsair GS800 Power Supply Problem
BINGO! Pin 5 (per post 33) has two wires and one is cracked/split. Looks like QC issue. The wire was not long enough during the manufacturing process and came up short it appears...so just add a glob of solder? Friday Build.
I never would have found that without you guys. OH CANADA...!
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Re: Corsair GS800 Power Supply Problem
Good find, BUT is the power supply going to work? lets hope so.Comment
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Re: Corsair GS800 Power Supply Problem
very good find! keep my fingers crossed that it works after you reassembled it.Comment
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Re: Corsair GS800 Power Supply Problem
Preliminarily it works!!!!!!!
Tremendous ty
12.2v
5.0v
3.3Last edited by ShortCircuited; 04-05-2020, 01:15 PM.Comment
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Re: Corsair GS800 Power Supply Problem
awesome!
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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... -
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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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