This is a Nitro 5 Model# AN517-52-52T3 with a no power complaint. I have 19v to first mosfet drain but 0v on source. 1.4ohm on the CPU coils. injected .9v on source of second mosfet and the CPU lights up under thermal. Does this mean the CPU is shorted to ground? I seem to remember these Nitro 5 laptops having issues with the inrush mosfets shorting out and sending charger voltage to the CPU. Thoughts?
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This has nothing to do with the DC-IN Mosfets. They're simply switching the charger voltage to the main power rail. Nothing more, nothing less. -
DC in FET's are disabled by the charging IC in the event of a short on the main power rail. It's a standard check when troubleshooting any dead laptop as it's so common.
If your main power rail impedance = CPU Vcore impedance, this is usually because of a high side MOSFET/DRMOS short in the Vcore buck converter. You can only replace the affected component to see if the CPU was damaged (which it sounds like it is). I've seen some power supplies shut off fast enough to prevent damage, but predominantly it's a damaged CPU.Comment
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Getting a high side mosfet short on gaming laptop is norm rather then exception. Every other gaming board comes with this defect and i've never seen cpu survive this shock. these days i dont even bother to replace drmos,driver ic or pwm when i see this fault -sheer waste of time and resources.Comment
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Your original post make the correlation between input MOSFET failure and CPU failure which was incorrect. You still arrived from A to D, but skipped B and C in between as far as troubleshooting goes. Just need to correct when needed to educate everyone on how these things work, rather than spoon feeding them with a Please Bro answer.
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Hello everyone,
I'm trying to repair my old Acer Nitro 5 (AN517-54-55T5). I've already bought a new laptop, so this is more of a learning project. For the experience, with no high expectations of success.
Well, my decice specs are the following:
Model: Acer Nitro 5 AN517-54-55T5
CPU: Intel Core i5-11400H
GPU: NVIDIA GeForce GTX 1650
Motherboard: GH51G LA-L181P Rev:1c
The symptom:
When pressing the power button, the power LED lights up for about 5 seconds and then turns off. Initially, the issue was intermittent: sometimes...05-26-2025, 10:49 AM -
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... -
Looking for guidance in tracking down missing main power rail.
I have an Acer that I am working on. It runs on the battery, but does not charge. I changed the power adapter and same thing battey not charging, and continues to discharge. So I opened the computer and started looking for the problem to fix.
First thing I checked is if the power form the charger is getting to the mainboard. I found that 19V is going all the way to the first MOSFET. So DC jack is fine. However I do not have power past the first MOSFET.
So checked for voltage on the gate of the first MOSFET and... -
hello guys i have here ACER NITRO 5 AN515-52 DH55VF LA-F591P POWER ON NO DISPLAY i think it boots beacuse the keyboard lits the fan spin 2 times when power on because i think bios responces without cmos battery also when charger connected then charger plug in it also tones plug and replug my main problem is it wont display even in monitor
heres my voltage and resistance reading for all the coil or inductors i hope someone can help me where to find the missing voltage on +VGA_CORE and +VCC_GT
PL1302 1.3V
PL7202 0.9V
PL8301 1.0V
PL8106 0.9V
PL8305 0.9V
PL8306...10-16-2024, 05:17 AM -
Hi all!
I'm trying to troubleshoot a Microsoft Surface Pro (5th gen) model 1796 that won't power on. Motherboard model is M1007506-015. My priority is retrieving data, but the SSD is integrated so it looks like if I can't repair it it'll need to go to a data recovery company. I've done a little basic board repair before, but nothing this advanced until now. So please forgive my ignorance in advance. 😅
I found the boardview for this laptop in the forums here, and am able to open it on my PC with FlexBV.
https://www.badcaps.net/forum/troubl...-hardware-devi...
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