Hi
I have a 453 Mini , two of the four Sata ports are not getting 12V . I am wondering if anyone has knowledge on hardware repair on these devices . I have attached an image of the board , it appears the Sata ports are powered in pairs , the right pair are working , left pair no voltage ( 0.2V)
I have tried tracing the 12V rail , though have not been successful . I am guessing there is a Transistor or Mosfet that is open
Any help , perhaps a schematic?
The board otherwise appears to work fine .. Boots up ,
...
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My laptop is black screen, but have power. HP 14s-cf0121TU.
LED status - 3 long 2 short.
Already replaced with new Ram. Same frequency. But same problem.
Any other solution? I'll just test the bios if corrupted. Thanks.Today, 06:06 AM -
I am still new to this, so I might sound brainless/ignorant in parts of my description/questions, since I have a lot of gaps in my knowledge, but I will do my best.
The laptop is Lenovo Legion Y540-15IRH, and the motherboard model is NM-C221 Rev 2.0 (Schematics and BoardView can be easily found). To save time I have the exact problem in the laptop as the one shown in this video:
[url]https://www.youtube.com/watch?v=tfucZ_WKpz4[/url]
I was checking the voltages I found that the main power rail V20B+ is good, and same for the +3VALW circut, but when I tried the +5VALW,...05-08-2024, 10:52 AM -
-
Hello
I'am a beginner in electronics repair and i got some trouble to find what's goning on a computer. It is a lenovo yoga C940-15IRH laptop and the screen doesn't work anymore, but that work on an external one
the screen seams to be hard to unbuild properly so i want to test it by other way
how can i be sure if the signal is really send to the screen ? i did some check on screen connector on LCD1 got 19v and on MiC1 connector on the other side of the screen (dunno if it's for the screen itself or other thing) got a lot of 3.2v pin
did u got...05-04-2024, 10:00 AM -
I bought one of [URL="https://www.aliexpress.com/item/1005002890887241.html"]these [/URL]as it was the only one I could find that is compact enough to fit in my toolbox (though I've since found [URL="https://www.aliexpress.com/item/32844169715.html"]KSGER make a substantially safer looking one[/URL]). It's one of those fan-in-handle things that has the 230V element in the handle. Quecoo briefly sold a [URL="https://www.aliexpress.com/item/1005004884759470.html"]similar unit [/URL]but discontinued it.. maybe they couldn't find solutions to these problems. I'm aware...Yesterday, 09:09 AM
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https://[URL]https://www.repairlap.c... LA-946P REV:1[URL]https://www.repairlap.com/threads/dell-inspiron-3520-hdl5a-la-l946p-rev-1-0-a00-schematics.23914/[/URL]
I need schematic please help
LA-946P REV:1Today, 05:36 AM -
Hi Community,
I've got the above model that activates the relay (clicks) and powers on the LG logo power light on when turned on. It then almost immediately turns off. I not noticed any image on the screen or heard any sound during this brief period.
Checks show:
3.5v on SMPS on (in off state, no other voltages present incl pwr on)
On pressing power button > the 3.5 pwn on voltage, 12v and 24v lines appear on the SMPS connnector between the main the SMPS but then all drop the zero in 1-2 seconds
Disconnecting 24 to TCON connector and powering on shows...05-08-2024, 02:42 PM -
I bought a T12-958 recently with an M8 handle and until now it has worked very well. The tip wasn't earthed but that was easily resolved.
Now, whenever it is switched on, it heats up to about 70*C then shows an [INVER] error on the screen and stops. In order to fix it I have to either unplug and re-plug the handle, or unplug and re-insert the tip from the handle. While doing that it changes to [ERROR], then it finishes heating up and works perfectly. Until it's turned off, after which it will show [INVER] again next time it is turned on.
Any idea what the problem is?05-06-2024, 01:36 PM -
Hello. Coming to you from the laptop forum. Have a client with the Fortinet 50E that has 320 Mbps as internet input speed but only 20 Mbps output on each and every downstream port (using FAST.COM to benchmark).
Reseller is stating the Fortinet is 'worn out' which does not sound logical at all unless the flash memory is 'worn out'. They, of course, want to sell another + onsite installation fees.
Can anyone share feedback on this unit? What can cause this sluggish behavior. From our knowledge, this device is snooping on the traffic to halt viruses / hack attacks, etc....04-24-2024, 12:51 PM
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I have an Asus G14 (GA401QM) that has a power issue. Originally the board had a shorted 5V rail and dead EC. I reballed a working EC, soldered it on, and I resolved the 5V issue by replacing the APL6012 and the low side 5V mosfet. Resistances on all power rails are healthy now, but 20V does not make it through the first MOSFET. 20V is present on the drain of the first MOSFET, but there is no voltage on the gate or source.
When diagnosing this issue, I thought that the issue was due to the BQ24800 chip not outputting the correct signals so I soldered on a known working chip and the...05-08-2024, 01:30 PM -
Hi,
working on a ASUS ROG STRIX GL702VSK 60NB0DZ0-MB1260 that does not power on. At the PQ8900 PIN2 (P_CHG_ACMOS_G_20) I am receiving 24.7V and PIN1 (P_CHG_ACMOS_S_20) 20V, however when I place the PQ8901 P_CHG_ACMOS_G_20 it drops 0V. I don't have the replacement mosfets ( N-MOSFET QM3058M6AC PRPAK5*6
UBIQ) however will any N-channel mosfet with similar parameters work ? I also found that PCI8703, PCI8701 are shorted. any help would be grateful.05-07-2024, 04:34 PM -
My laptop is black screen, but have power. HP 14s-cf0121TU.
LED status - 3 long 2 short.
Already replaced with new Ram. Same frequency. But same problem.
Any other solution? I'll just test the bios if corrupted. Thanks.Today, 06:06 AM -
https://[URL]https://www.repairlap.c... LA-946P REV:1[URL]https://www.repairlap.com/threads/dell-inspiron-3520-hdl5a-la-l946p-rev-1-0-a00-schematics.23914/[/URL]
I need schematic please help
LA-946P REV:1Today, 05:36 AM -
Hi,
Can someone please remove this bios password from my bios file. Thanks.
Dell Latitude 5510
Board number: FDW50 LA-J381P Rev 1
Please see attached bios file.
[url]https://drive.google.com/file/d/1hraqxvYlX5lxPTztt1q-qCg0jIcjZ4Be/view?usp=drive_link[/url]https://Hi,<br /> Can someone please...ive_link[/url]Today, 04:59 AM -
Hi
I have a 453 Mini , two of the four Sata ports are not getting 12V . I am wondering if anyone has knowledge on hardware repair on these devices . I have attached an image of the board , it appears the Sata ports are powered in pairs , the right pair are working , left pair no voltage ( 0.2V)
I have tried tracing the 12V rail , though have not been successful . I am guessing there is a Transistor or Mosfet that is open
Any help , perhaps a schematic?
The board otherwise appears to work fine .. Boots up ,
...Today, 04:52 AM -
HELLO ALL
IHAVE DELL 15 3000 i5 4gen dis gpu
i tried several bios no result
note all bin Which I tried are i3 UMA .
motherboard code
iris hsw bdw 14216-1
1XVKN REV A00
can you help...Today, 04:40 AM -
please..need bios for acer E5-476 DAZ8VRMB8E0 REV E model...Today, 04:38 AM
-
Hi friend, I've this notebook HP Gaming 16-a0006nl with QUANTA DAG3JBMB8D0 that won't power on.
I start checking first mosfet and they seems to be ok.
On power button I get 3 that go to 0 on pressing, and come to 3v on release.
After I check charge ic that is BQ738H
I write here measure with battery and ac
19
19
19
25
3
1.9
0
3.1
3.1
1
11
11
11
gnd
0
6
10
11
11
19
I've 0 on pin 7 IOUT and on pin 15 LODRV.
...05-08-2024, 07:09 AM