I am working an a MBA 13 2020 that has no display. The MacBook power on but no display. After Checking on the backlight I found out that the EDP_BKL_EN was missing. And this power enable was coming from the PCH. So that means this MBA board is no chance to bring it back to life? any suggestion would really appreciate. Thanks, MobileXt
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Re: A12179 820-01958 Missing EDP_BKLT_EN
Remove all power -> check the resistance to ground of EDP_BKLT_EN. -
Re: A12179 820-01958 Missing EDP_BKLT_EN
Locate R0550 and measure the voltage on pin # 2. This is only to confirm that the trace for EDP_BKLT_EN is not broken from the PCH to the target.
Then remove all power, measure the resistance to ground of pin # 2 of R0550.
What is the reading ? Is it the same ~86K ? The resistor is a 100k value but perhaps while in circuit, the reading of 86k is normal.Attached FilesComment
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Re: A12179 820-01958 Missing EDP_BKLT_EN
What is the measurement of the voltage on pin #2 of R0550?
Is it the same voltage as you are measuring at the enable signal rail?Comment
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Hello. I would need some advice please.
My son's MBP suddenly stopped working and is now only getting the green-then-orange light on Magsafe and no fan spin.
He brought the MBP into the house (22 deg C) from a very cold conservatory (-3 deg C) and turned it on straight away. The Mac suddenly died a few minutes later.
I examined the logic board and couldn't find any signs of water damage, corrosion, blown up components etc. Nothing was ever spilt on it, and the logic board looks immaculate.
I have already replaced the logic board with another... -
Hi everyone, I hope you are having a good day.
I have a laptop sony Vaio, DA0HK1MB6E0, MBX-247. REV: E
The laptop suddenly shut down as the owner told me, so I did the normal check there is no short but the laptop it's not powering up and there is no light when I connect the adapter because there is no battery.
so I checked.
pu9:
Vin: 19v
Ldo: 4.89v
Ref:1.99v
Vcc: 4.89v
Vdd: 4.89v
output
3.3v pcu.
EN2: 4.89v
but No... -
Huawei D14 dah98ambad0 rev d please help identify Missing components
Hello I just bought this laptop to be used personally (that I'm currently trying to repair.), I am aware that liquid (gravy) has been spilled in this area before. but there are missing components it it possible to have a board view or a schematic of this? or just an idea on what components its missing?
as far as I know this parts are connected as sense or enable.... that's how far I know...
Images attached:
the picture of the area. and some of the pinouts that I noticed on the chip... -
Hi, my friend have this laptop
Before all voltage missing, im already repair this laptop 3x (i have 3 of this laptop and all of them dead, can't be repaired because dead CPU and other component due unknow chips, why always asus laptop have this issue).
1st repair it short at 3vsus (dead low side mosfe and short caps)
2nd repair short at CPU Vcore mosfet (low side)
3rd repair 12v missing (only 1.2v but it can run bios and hdd not detected because 3vs missing).
and then after 3x enter BIOS it blank then dead (all mosfet buzzing, 12v still missing)
...11-23-2022, 09:51 PM -
Hi,
I have an RTX 2080 ti (Zotac - triple fan) with no video output.
So far I have measured the following:- PS_FBVDD_PH3_SW = 40 ohm to ground (Micron ICs) - Memory should be fine right?
- 12V power rail present
- 3.3V power rail present
- 5V power rail present
- 1.8V power rail present
- Vcore power rail missing --> PS_NVVDD_VREF is present. (from uP9512P / U812)
- Vmem power rail missing --> Not there because Vcore power rail is missing.
Any idea? I have already tried to flash the BIOS chip (backup got created) - sadly no changes.
Source: https://www.techp...
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