Hello have this Lenovo g70-70 AILG1 NM-A331 with no power. second p-mosfet have 20v on gate. i cannot find shematic. what to do?
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Re: Lenovo g70-70 AILG1 NM-A331 no power
I found Lenovo g50-70 schematic maybe it does help as reference(?) -
Re: Lenovo g70-70 AILG1 NM-A331 no power
NM-A271 could be somewhat similar.Comment
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Re: Lenovo g70-70 AILG1 NM-A331 no power
First thing is to make sure both DC-in MOSFETs are not shorted.OpenBoardView — https://github.com/OpenBoardView/OpenBoardViewComment
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Re: Lenovo g70-70 AILG1 NM-A331 no power
i have ACDET, VCC, but no ACOK on BQ737
replaced but still the sameLast edited by ktmmotocross; 09-07-2019, 12:57 AM.Comment
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Re: Lenovo g70-70 AILG1 NM-A331 no power
i jumped second mosfet and voltages looks ok even after press power button. but no post and power just jump to 8WComment
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Re: Lenovo g70-70 AILG1 NM-A331 no power
MAYBE ite PROBLEM?Comment
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Re: Lenovo g70-70 AILG1 NM-A331 no power
If first DC-in MOSFET is fully shorted, both gates will have DC-in voltage on them, second MOSFET will never be turned on.OpenBoardView — https://github.com/OpenBoardView/OpenBoardViewComment
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Re: Lenovo g70-70 AILG1 NM-A331 no power
looks like u have right. first mosfet shorted between base and source. after replace power is good, but still no postComment
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Re: Lenovo g70-70 AILG1 NM-A331 no power
guys anyone can help with this?
after mosfet change, it self start. all voltages are good. cpu and gpu is heat, but no post. try to flash bios but no luckComment
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Re: Lenovo g70-70 AILG1 NM-A331 no power
Hello. please help! Lenovo G70-80 NM-A331 does not turn on. 3.3V, 5V okay, bios okay. Charges the battery. When the power button is pressed, the power white LED flashes only once and does not turn on. has anyone encountered such an error?Comment
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Re: Lenovo g70-70 AILG1 NM-A331 no power
You can start by trying bios. Are the coil resistances and voltages normal, are there any heated parts.I'm not happy to be so strong. because it's not humanlyComment
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Re: Lenovo g70-70 AILG1 NM-A331 no power
I add schematic.
https://www.badcaps.net/forum/showthread.php?t=79220Comment
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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... -
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... -
Hi all,
TL;DR - this laptop is driving me nuts with the oddball power-related behaviors. Appreciate any insight you can provide!
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Hi,
Try to repair a Thinkpad P72 EP720 NM-B723 MB with I7-8850H processor and N18E-Q1-KB-A1 (P3200) GPU with 6GB memory. Unfortunately there is noinfo what happened to the laptop. I got it disassembled with parts missing, like keyboard, battery.
Unfortunately I have no schematic available for me (requested in the sub porum) but got the boardview file.
Symptom: after connecting to the charger the power led light up for one-two second and switch off. After a couple secons the power led light up for half a second and switch off. No battery, no IO board, no... -
I have a lenovo ideapad 5 14itl05, board LA-K321P, That will only power up on Battery only, or with battery disconnected and power adapter only. If battery is connected and usb-c power plug connected. It only works on battery and will not charge. I can however force it to charge by connecting the battery from a disconnected state while the power USB c plug is powering the laptop.
Additionally....to add to this strange situation. The usb-c power plug ONLY works to power the laptop on one side when inserted into the boards power usb c plug. If you rotate it 180 degrees, the board gets...
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