Inspiron 3421 - No power unless...
It doesn't turn on, but after removing the BIOS battery a few seconds, reinserting it and plugging the charger, it comes on and boots perfectly. When turned off (via "Turn off" option because power button doesn't register, but the switch itself works), it can't be turned on again unless the procedure is repeated. Any clues?
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Re: Inspiron 3421 - No power unless...
Review the dual diode @ D6001.
Remove all power. Meter in DIODE mode.
Red meter probe on pin #2. Black meter probe on pin # 3. Should conduct.
Reverse the meter leads, the meter should be in OL (block mode).
Repeat for pins # 1 and # 3. Same readings if all is ok.
If this part is defective, the diode will conduct in both orientations of the meter probes. Then it should be replaced.Attached Files -
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Re: Inspiron 3421 - No power unless...
Measured D6001 as described and it is OK.Comment
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Re: Inspiron 3421 - No power unless...
Test with a fresh known good RTC (clock) battery.Comment
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Re: Inspiron 3421 - No power unless...
RTCRST#
SRTCRST#
Measure and report back. Measurements should be done with 3.3V cmos cell inserted and no power attached.Comment
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Re: Inspiron 3421 - No power unless...
Yes, fresh battery.
RTC_RST# and SRTC_RST# are both at 3.18V.Comment
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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!
I'm experiencing a power issue on an Asus Probook P5440UF-XB74. Although I've worked with electronics and computers for decades, this is my first attempt at getting into motherboard-level component troubleshooting. Any help the community can provide is greatly appreciated!
A few weeks ago I was using the laptop (on battery power) for a Zoom meeting. The battery was running very low (long meeting) but I wasn't worried about... -
hey guys, hoping for some pointers to repair an eBay bought "faulty" laptop.
Ill try and give as much info as I can.
Dell Inspiron 17 (7786) Laptop
Service Tag: 5J0NHT2
Bios: 1.9.0
When I received this , it would only flicker on the KB backlight for a second, then off and on.
Then it started getting weirder!
Sometimes when attaching the AC power supply, and pressing various pre-boot diagnostic keyboard keys... it did try to boot, in fact out of a hundred attempts, the laptop did actually boot into the Bios ! but never has... -
I have wanting to do this project for quite sometime now and I finally found a switching power supply that will work on this desoldering gun station ZD-915 that the original switching power supply took a shit and just was not worth trying to fix it because this switching power is not quite big enough to handle the heater element and the vacuum pump
One note when I tested the switching power supply and the voltage control board I noticed that this desoldering gun heat up much faster than the original switching power supply which I was really surprised by to the point that I might buy... -
Dell inspiron 3168 (Board no=15299-2) no power with battery and charger.No charging.
But after removing battery, worked perfectly.
next day again no power.Then check 19v section.section ok.mosfet driving perfectly.
But 3v LDO was not generated.Then i checked the enable signal of the ic.It is perfect according to datasheet.Then i checked the impedence.It is perfect(444).So i replaced the 3v ic.Then worked.
Again next day, same issue.then i decided to disconnect the ldo line by cutting the path.After that LDO generated well.Then again connecting...
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