Re: Hyundai L90D+ inverter mosfet problem
Just received the FETs yesterday - will give this a go in the next few days...
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Re: Hyundai L90D+ inverter mosfet problem
I too have the same problem with this board. Did you get it working by replacing the APM9932 FET's and C23 and C53 cap's?Leave a comment:
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Re: Hyundai L90D+ inverter mosfet problem
Hello! The APM9932 is available through Ebay, item 200446667412. It also looks like the seller ships worldwide. Hope this helps.Leave a comment:
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Re: Hyundai L90D+ inverter mosfet problem
Hi Lydux,
I have an identical monitor with exactly the same symptoms and am going to attempt to repair it - did you have any success with yours?
CheersLeave a comment:
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Re: Hyundai L90D+ inverter mosfet problem
Just try this, and it seems that U4 is shorted on P channel. I've got 0v from D to S and S to D, that's it ?Originally posted by Krankshaft
Thanks to ecking767 and dondrusco for your tips guys ! I do not know this ability on Fairchild website ! Unfortunately, it doesn't return me anything with APM9932.
So, a 0.1 uF capacitor for C23 will be good ?Leave a comment:
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Re: Hyundai L90D+ inverter mosfet problem
It's discharge capacitor, I think.
But exact value - I don't know. I found correct value by searching MOSFET datasheet.
https://www.badcaps.net/forum/showthread.php?t=5346Leave a comment:
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Re: Hyundai L90D+ inverter mosfet problem
Test the driver FETs with a DMM are either of them shorted?Leave a comment:
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Re: Hyundai L90D+ inverter mosfet problem
to solve one of your problem C53 and C23 should have the same value. The circuit is symmetrical. As for the AP9932 try FairChild website cross reference
Hope this help
ecking767Leave a comment:
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Hyundai L90D+ inverter mosfet problem
Hi there !
I would like to thank you first for this great forum, I learn a lot here on LCD repair !
I recently found a dead 19" Hyundai L90D+ that I really would like to fix and I think I'm getting closer to this.
Here is what's the problem : just after plug in the power cord, the blue power led turns on. About 5 seconds later, this same led quickly turns to orange and everything shutdown like if a short has come (I can also hear a tick at this time). So, this process restart and loop forever. No Backlight at all.
Looking to the power/inverter board doesn't show me bulged caps, and anyway it looks like more a MOSFET issue.
I disconnected it from the logic board, the ticking stop and I get a good 12V and 5V at pins header without shutdown.
Then, I hooked SLP to 5V and the backlight starting to flash.
This drive me to the solder side of the board where I can find two dual NP mosfet (U4 and U5) named APM9932 (datasheet here ). Looking closer, I can also see a damaged smd capacitor just nearby U5 (C23). So I suspect something in that area to be the failure.
Since I cannot find service manual for this monitor, I don't really know what value is C23 nor what kind of mosfet can substitute these APM9932 (can't find them on Digikey or Mouser). And anyway, I'm not an hardcore mosfet calculator.... :p So I need your help on this point !
Am I right on what I have done ? Any advices else ?
Many thanks in advance !Attached Files -
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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 -
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... -
Hey guys,
i have a asus motherboard here and as the title says after the first mosfet (in the picture) there is nothing more than 3.15v.
I injected 19v and max. 1 amp at the charging port and there is not voltage drop or smth. It's just taking 19v and 1 milliamp.
Then i tried to inject 19v and max 1amp after the current sensor and there it first takes 19v and 4 milliamps and after 2 seconds it is taking nothing (no current).
I measured on the coils on board everything seems fine. Also the main power rail is not shorted (infinite resistance).
Now i thought something... -
The board number is GU502DU. I repaired this a couple weeks ago and it came back with the same issue, same mosfet failed (PQH9201). I'm hoping that the GPU was spared this time.
I used the same replacement part (purchased from Mouser) and I'm certain the soldering was done properly since it took just as much effort to remove as before. What could cause this same mosfet to fail? I'm thinking if it was unsuitable then the others would fail too. I looked for similar failures on YTube and the mosfet was replaced with AOE6930 in one instance and AOE6932 in the other but it's possible that the... -
I have an Asus GA502D, it had a blown mosfet which I replaced and the laptop booted into windows, a few mins later it shut off, the same mosfet was blown. I thought maybe just a bad mosfet but same thing happened again, a few mins in windows and shuts off.
I have removed the mosfet and can run the laptop no problem
The MOSFET is FDPC5018SG
Can anyone point me in the direction of what could be the cause of this, could it be the controller rt3663bc?
Thanks
Leave a comment: