Re: 32PFL3606 Fuse blow invert mosfet shorted
Just some things i have found the IC 801 UBA IC measured 35ohm if the IC is on the board. The strange thing when the IC is of the board the VDD en GND pin are very normal. So there have to be a short circuit behind this IC or is there possibility that the IC is short inside?
And the above voltage are also higher when the IC is removed, only 313v is still there sometimes it is higher but drops then, maybe this is a protections that see that the IC801 is removed. All voltage are a normal 10V on the other IC in the same circuit.
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Re: 32PFL3606 Fuse blow invert mosfet shorted
Yes okay I will get to it tomorrow, thanks for the support so far.Leave a comment:
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Re: 32PFL3606 Fuse blow invert mosfet shorted
OK, per diagram of the connector pin out, the ENA pin is BL-ON (Backlights on) command pin.
The S/B pin is the PS-ON pin. And when you force on you must remove the cable for that command wire going back to the main board first otherwise you can damage the switched transistor on the main board, and always use the resistor for current limiter.Last edited by budm; 03-26-2015, 11:48 AM.Leave a comment:
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Re: 32PFL3606 Fuse blow invert mosfet shorted
Nope if I jump the ENA the 12v and 24v is not present. And only the above values are present, ant the 5v standby of the supply is steady.Leave a comment:
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Re: 32PFL3606 Fuse blow invert mosfet shorted
So, if you jumper 5V to the ENA pin, the 12V and 24V output stays constant? If yes, then it sounds like the problem is in the mainboard?Leave a comment:
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Re: 32PFL3606 Fuse blow invert mosfet shorted
Yes of course you can get them, here you go. But I have enable the supply with 5V to the ENA, and also tested with 5V to the S/B pin. Same low voltages, on the components.Attached Filesif you find these attachements useful please consider making a small donation to the site
Last edited by rpater; 03-26-2015, 08:04 AM.Leave a comment:
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Re: 32PFL3606 Fuse blow invert mosfet shorted
Can I get the list of the pin names of that white connector of that power supply/inverter board?
It sounds to me the signals from the main were present to turn on the power supply but then go away.Leave a comment:
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Re: 32PFL3606 Fuse blow invert mosfet shorted
Q806
B = 0.38V
C = 0.38V
E = 0.00V
ZD801
A = 0.00V
C = 0.38V
IC801
VDD PIN = 0.00V
ZD909 Not shorted
A = 0.00V
C = 0.38V
Q903 Not shorted
B = 9.86V
C = 0.38V
E = 9.86V
Maybe you have so more information, thanks a lot for your support.Leave a comment:
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Re: 32PFL3606 Fuse blow invert mosfet shorted
So the PFC isn't working then. If the PFC works there should be more than 360V on the 450V filter cap. 300 and some change won't cut it. Also I think Vdd-S is missing or pulled to GND. That is on 3 IC's. See what you get at Q806 and the Zener ZD801. Read the VDD pin on IC801. Check ZD909 and Q903 for piece of mind.Leave a comment:
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Re: 32PFL3606 Fuse blow invert mosfet shorted
Yes 313V, but on the vcc pin from the FAN6991 is there only 0.3V also on the vcc of the NCP1271D65R2GLeave a comment:
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Re: 32PFL3606 Fuse blow invert mosfet shorted
Gate resistor is replaced for a new one, IC801 is not sorted. Because when i remove IC801 the 12v and 24v are doing just the same.Leave a comment:
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Re: 32PFL3606 Fuse blow invert mosfet shorted
If the mosfet blows, usually there is more shorted or bad. Check the gate resistors etc, maybe IC801 is bad.Leave a comment:
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Re: 32PFL3606 Fuse blow invert mosfet shorted
Mosfets are replaced and fuse is ok now, only the back-lights will not lights up.
There is no 12v and 24v is come on and dropping to 0v, S/B is make just one swing to 3,3v. 5v standby is steady, ENA pin is also makes just one swing to 3,3v and the bake to 0v. So i think the PSU is turned in a protection.
I have removed the UBA ic no luck all is stay the same, also look for short on the main-pcb and disconnected the 12v and 24v no luck also. So I running out of option, maybe there is some one that can give me the golden tip.Last edited by rpater; 03-25-2015, 04:34 AM.Leave a comment:
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Re: 32PFL3606 Fuse blow invert mosfet shorted
The board looks a little brown under the inverter transformer, should remove and inspect the transformer, this can be due to worn out lamps or just worn out or under rated transformer.Leave a comment:
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32PFL3606 Fuse blow invert mosfet shorted
Problem with Philips LCD, fuse is out and one of the inverter mosfets is shorted.
Is this a case of poor power supply design allowing the fet to fail do to use of the lcd or is more that I have to check?
Type fet this http://pdf1.alldatasheet.com/datashe...D...F8N60.htmlAttached Filesif you find these attachements useful please consider making a small donation to the site
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Hello everyone, I recently found this badcaps site and super Learn Electronics Repair youtube channel. And I wanted to learn how to troubleshoot power supplies and VGA cards and how to practice soldering, since I already have a properly defective piece of them. I am currently trying to solve two problems:
I have a Gigabyte GV-RX460WF2OC-4GD type card. I managed to find the faulty MOSfet (AON6414A) on it, which I replaced. The card starts up, but after about half a minute, the MOSfet in the same position will be shorted again. Is it possible that the PWM controller driving the MOSfet... -
I've got an old Alienware M18x R1 which shorted out the charger whenever it was connected. Tracked down the short to two shorted caps and burned CPU power controller caused by a shorted mosfet on the CPU's graphic power supply.
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I bought a dead motherboard, and connected it to this PSU,
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Hi All,
I have this MSI GTX-980ti Gaming Golden Edition. It had shorted mosfet on memory. Replaced the shorted i.e. Q47 PK616BA with 4C09N and the card ran fine for a month. Then suddenly again the same problem. This time when i replace it 4C09N or with replacement PK616BA (Aliexpress) it gets shorted. As soon as turn on the PC the PSU shuts down and the same mosfet Q47 gets short.
What should be the next step. Kindly guide.
The board view files for this gpu is available and attached. https://www.badcaps.net/forum/showthread.php?p=1237952... -
I tried to use this method:
Testing an N-channel MOSFET:
Step 1: Discharge the Gate (turn off the MOSFET)
Place the black probe (COM) on the Source (S) and the red probe on the Drain (D). The multimeter should show no continuity (high resistance or "OL" – open line).
Then, touch the black probe to the Source (S) and the red probe to the Gate (G). This discharges any stored charge in the Gate, turning the MOSFET off.
Step 2: Charge the Gate (turn on the MOSFET)
Now, place the red probe on the Gate (G) and the black probe on the...09-27-2024, 03:31 AM
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