Good Day,
anyone have Schematic and Board View of HP Envy 17, ASW72 LA-C991P
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Modification to a Switching Power Supply Transformer 4.0 @ 40 amp to charge 5 volt battery bank for iPad
This is the switching power supply that is used in this project
[URL]https://www.ebay.com/itm/164440680270?var=464055952700[/URL]
Here is the BMS protection board
[URL]https://www.ebay.com/itm/386887030793?itmmeta=01HT6PJER32Z0N880W1BD0GK25&hash=item5a14439809:g:t2IAAOSw9ethASO~&itmprp=enc%3AAQAJAAAA4JODOIBDFNYV452QZ%2F7u5SNdSJNM9dII2jLWhr2vTzh%2BbgI188pOb2NlSAKJJMkLOhqsf%2BDNhzjIKjAeu3zAgrYmbpWAt%2Bn2RHmjmno1n5ZDFbfZPMuRg3rS1Z6hsdCOT%2F22kLGvW1ZB7KBMPSVuUeok0Ul2fO0B01UmHz89Wyb1KiwTMQL%2BEhTLS22Q62MguESjFwsY6PDk1%2FJM%2BfM0Yp95WByWTLpUOe2J0XNnZ1tgeiiBFn%2B3x1VjJibDZhNgd0uqKakIVidiFXXoX7fMq0%2FqZjERoG5rjkVbfiYOHoH4%7Ctkp%3ABk9SR47sydbRYw[/URL]...Last edited by sam_sam_sam; Today, 09:37 PM.
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Apple A1407 Power Supply PA-3251-3A2 noise
I have a problem with an annoying sound coming out of a power panel, a sound coming from a coil, I try to change the capacitors, but there is no change when connecting the computer to the charger, the sound increases and decreases when disconnected...
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RTX 2070 Fan not operating - 12v present at header but drops to 2V when fan connected
I recently purchased a second hand RTX 2070 - an OEM Acer Predator manufactured by Sapphire - not a very common model.
Upon connecting it up I noticed the fan wasn't operating resulting in the card overheating and shutting down. I checked the fan operation independently by connecting it directly to a power supply and function generator - it was working correctly with variable speed according to the square wave frequency.
I then checked the output with a multimeter/DSO and verified that the GPU was putting out both 12V at pin 2 and PWM at pin 4. However, when the fan is...1 Photo
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Can i plug pc on this apartment with older fuse box?
Hello. I will be buying new apartment to live. But fuse box is older. Not the newest.
And my question. It will be fine to plug pc in this new apartment with that fuse box,i think it is aluminium,right?
PC WILL BE: Rtx 4090,14900K,1600W PSU
It looks like this ( screen from internet ). Looks like this,not sure i dont take a pic from there. Can i plug pc with that one?
screen of this:
[ATTACH=JSON]{"alt":"Click image for larger version Name:\tGetty-Images-1345734173.jpg Views:\t0 Size:\t236.3 KB ID:\t3244496","data-align":"none","data-attachmentid":"3244496","data-size":"full","title":"Getty-Images-1345734173.jpg"}[/ATTACH]...
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i need HP Elitebook 735 G6 Bios
Hello,
i need Bios for HP Elitebook G6
thanks in advance
SN: 5CG0322DZL
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DELL latitude 7430
[B]DELL latitude 7430 [/B] bios corrupted need clean me if someone can do it please .
S/T: 7872TQ3
MB: [URL="https://www.badcaps.net/filedata/fetch?id=2255075"]LA-L581P[/URL][B]DELL latitude 7430 [/B] bios corrupted need clean me if someone can do it please .
S/T: 7872TQ3
MB: [URL="https://www.badcaps.net/filedata/fetch?id=2255075"]LA-L581P[/URL][B]DELL latitude 7430 [/B] bios corrupted need clean me if someone can do it please .
S/T: 7872TQ3
MB: [URL="https://www.badcaps.net/filedata/fetch?id=2255075"]LA-L581P[/URL][B]DELL latitude...
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Acer Aspire 5 a515-52g, EH5AW LA-G521P Rev.1a does not start.
Hi goodday to all.
I really ask for help.
There are two motherboards (absolutely identical) Acer Aspire 5 a515-52g, EH5AW LA-G521P.
Both boards have exactly the same fault symptoms. It turns on, the power indicator lights up for 5 seconds, turns off (the fan does not spin).
Both boards are flashed with Bios Main and Bios EC from the “Bios Acer A515 LA-G521P FULL TEST” topic. XM25QH128AHIG replaced by W25Q128JVSIQ (also NOR-FLASH, XM was not detected by the programmer). On one of the boards, KB9022 was changed, followed by firmware. The fault persists on both boards....
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Samsung UN55MU6290F Panel Short, help fixing
So the one guy said the panel short potentially could be fixed so, here's a TV. TV reboots continuously. Backlights work fine. I put some tape on the top ribbon and the TV was able to turn on and get picture. I attached a pic of which lines I taped as well as some other pics of the buffer boards. Appears the "short" is on the right side buffer board. There are no esd diodes that I see.
Anything can be done?8 Photos
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Need Schematic and Board View MSI Raider GE66 MS-1541
Good Day,
anyone have Schematic and Board View of MSI GE66 Raider Model MS-1541 no power
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Anyone here fix a tv and customer cracks panel when they get it home?
About 2 times a year, a customer will do this. We fix the tv, put it on test play, and customer sees it working. They see me pull power and video wire. Sometimes I pick up tv, right in front of them, and carry it out to their vehicle while they are next to me. I set it in their tv gently, and tell them the tv is very fragile, be careful with it. I let them close the door/trunk. That day, or a few days later, they tell me there is a crack inside the tv. Normally I tell them transportation is their responsibility and normally that is the end of it. Has anyone had a customer that was not buying this...
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please help friend extract bios file from website FL1 exe to bin thinkpad p1 gen 3 no display beep melody thank you
please help friend extract bios file from website FL1 exe to bin thinkpad p1 gen 3 no display beep melody thank you...
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Lenovo M70Q - 11E8 - that is dead
hy, i have a PC M70Q - 11E8, that is dead, no power led, no logo led , change the CPU, still dead !
- pc is like new but with OS amazon.Gringotts2, i try to program bios 16mb, nothing, i change the 16mb W25Q128 with other, write another dump file, still no power up, replace again W25Q128 with other and write another dump file, still DEAD
- i have 3v3, 5v, 1v and others voltage. power botton drops to 0 and back 3v3.
my question , is possbile this pc will not power up becouse is locked ? maybe need a lan wake up , i dont know.
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Asus UX533FD no power
Hi guys, I need a bit of help, I have a Asus Zenbook with motherboard UX533FD Rev 2.1. Connecting the laptop draws 30mah and not coming on, Measuring the coils I got the values below. Measuring in resistance all coils have normal values, cpu about 8ohm and the gpu about 5ohm but I guess its normal. Checking with the thermal camera, the only 2 chips that have a bit of heat signature are the U3501 (pd controller) and the U3001 that is the KBC. Now I guess the PD controller it's not the the problem because the battery is fully charged and trying to turn on on battery is the same.
Just...
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Dell Latitude 5570 Ambient thermal sensor reading -127 Degrees C
Forgive me this is my first request for help on this forum, so if i've screwed up or not followed the rules i should have i apologise profusely.
I have a Dell Latitude 5570 that was randomly shutting down, on further investigation i found that the machine had been shutting down due to thermal events as noted by windows event viewer.
My investigations lead me to the dell diagnostics screen, where i found that there were two sensors out of range which had been causing the shutdowns, one of which was the GPU thermal sensor and the other the ambient sensor.
I opened the...
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ASUS Zen AiO ZN240IC REV1.4 Black Screen
Hello,
Fan spinning normally, power LED turns on and goes off almost instantly, computer remains on, has no internal/external display output.
S/N: G7PTTSIR000W
Model: ZN240IC
Make: Z2401CGT
Motherboard: Z240IC REV 1.4
BIOS dump attached....
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I need BIOS + EC. Please help (HP Elite x360 1040 G9 2-in-1)
[B]I need BIOS + EC. Please help
-----------------------------------------------------
MODEL: HP Elite x360 1040 G9 2-in-1
-------------------------------------------------------
PCB Ver
----------------------------------------------
POWDERKE-PV-G3M[/B]
6050A3316601-MB-AX4
2021-11-17
----------------------------------------------
SPEC
CPU: 12TH Gen I7-1265U
RAM 16GB
SSD: 256GB
-----------------------------------------------
Thank you.[B]I need BIOS + EC. Please help
-----------------------------------------------------
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ThinkPad X270 (NM-B061) no POST
I have a ThinkPad X270 (NM-B061) with the following error: the mainboard tries to start, the current goes up to 80 mA and then immediately drops back down to 20 mA. This is repeated every few seconds. Fortunately, there is a timing diagram at the end of the schematic. Starting from the top up to and including -PWRSW_EC it is all as shown in the diagram. Starting with -PCH_SLP_S4 you can see the periodic behavior, i.e. instead of the signal staying at 3.3V, it always drops back to 0. What conclusions can I draw from this behavior?
[ATTACH=JSON]{"data-align":"none&qu...
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Lg oled55b8 t-con question
There is 2 sia ics and in 1 section where u see dots on the coils i have 2.2ohm there and there is no voltage on them at all.
Also i read in other topić how psu works on these tvs and when u pług it in there is constant 40w draw from wall. When I unplug display from tcon it drops 10w when I unplug tcon it drops another 10w (unplug done w/o power ).
I'm mostly sure its main board cpu cause no sygnał to turn on 24 volt for panel and its constant draw.
For now I'm just curios about these w coils . Could not find any datasheet for ic thats the lines go...1 PhotoLast edited by reassor; Yesterday, 11:41 PM.
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Asus a15 FA507RE-A15.R73050T failure
So this laptop seems to have some kind of failure. I bought it second hand and originally the previous owner said that they went to turn it on and it was presented with a quick flash of the power light the keyboard lit up and then the keyboard shut off and the power light went off as well but the battery indicator was white and after about 5 to 7 Seconds flashes orange really quick then shuts off and goes back to White. If the power button is pressed again the keyboard lights up really quick and then repeats. When I got it I could press the power button multiple times the keyboard light would...
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Dell Vostro 3420 BIOS Password Removal
I have a Vostro 3420 8H8K5R3-8FC8 that freeze at any attempt to enter bios password or the recovery master password received from dell. I do not have a clean BIOS image to flash.
And as luck would have it happened a couple of months ago right outside of the warranty period (Dec 2023) warranty expired in September. Any help or guidance is appreciated.
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ASUS GL702V Bios flash
Hello all, so basically I have a bricked GL702V with no power except a single LED flash on the power button when it is pressed. Customer had tried to flash his bios with a USB and the GL702VM310 version of this laptop's bios. I've been scouring the web for a correct version of his bios but all the ones on the ASUS website are for GL702VM, GL702VT, GL702VS, or GL702VI with versions varying from 300-310. This specific laptop has nothing other than just the GL702V so I don't know which bios is compatible with it. I was planning on programming it with the CH341A programmer as soon as I found the correct...
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memory mod for amd radeon r7 260x
Hello, for almost a year i been trying to make something that seems impossible, or my testing software is lying to me and it works only i can't see that.
I been trying to mod a memory on radeon hd7790 or 260x from 2 to 4 gb, but it doesn't seems to be as simple as i first thought.
In theory 2 workstation graphic cards using the same graphical processor have 4gb of memory firepro w4300 has 4 256x32b layout and W5100 has 8x 128x16b layout all use gddr5 memory and internals of the bioses seems to be very similar so i was trying to wing it , but so far it seems either tserver can't show...
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Sony TV Model: KDL-42EX440 (To repair or not; Troublshooting)
Hi everyone! I found this TV on the curb of a residential area. I don’t know if it’s an easy fix, if so I could maybe use a spare TV for one of the rooms. Also to note I think it may have water damage since I picked up after this past rainy weekend. I’ve attached pictures of the TV and possibly the damage as well.For starters I’m just an amateur in understanding how to repair devices but I would like to learn. Also I know a little bit of soldering as long as it’s not complicated. I would like some insight if it’s worth repairing or not. Thank you for taking the time to help me!5 Photos
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Could you run a 3 phase motor using Arduino?
If you connected in the control wiring onto an inverter could an arduino programmer be used as the controller?
In my (limited and attempting to learn mind) using the right set of code and some simple wiring this would be relatively simple to achieve??
Yes?? Or if not can someone tell me why please 🙂
Thanks 👍🏻
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inspiron 7405 2-in-1 bios
need this bios
Dell inspiron 7405 2-in-1
Hellcat 14 ms amd
19732-1...
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Need Board View Asus RTX 3070
hi guys, need BoardView or schematisc for Asus Rog Strix RTX3070 8Gb Mb: CG142S -- R1.00X
3.3v Ok
1.8v = 0.9v
5v Lost
12v Ok
12v1 and 12v2 Ok
PEX_DVDD Lost but 7hom to Gnd
Turn on, fans spins, but doesn't generate video
thanks in advance...
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Philips 55PUS7303 LCD lines
Hello, I have this 55" Philips TV that suddenly has these vertical lines on the LCD panel. I have checked the T-con board and I noticed some caps have 40Ohm I don't know if this is normal. These caps have 1.2V on them. I mark them on the photo with a silver pen. The T-con board has 1.2V, 12V, 25V, etc. Does anyone have any idea what could it be?
i try to disconect one ribon cable and the problem is the same, one side is white other side have the lines (the same is in other way)
T-con model: 55T32-C0L
Main Board: 715G8579-M0F-B01-005T7 PhotosLast edited by rtstorm; Yesterday, 04:20 PM.
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Buying some single smd led diode for tv repair, your advice needed
I'm thinking of buying some single smd led diode for tv repair to have under hand there is so many, 2835 k-6000k 9v.6v, 3v white etc but don't know which to have if you advise me which Should I buy and which is most usual and bäst to have under hand. thank you
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wds-580 rework station issue
Good day.
i received used bga rework station wds-580 which was not going above 300c despite the parameter was set to 350c, Everytime beeps at 300c so i did a factory reset and by mistake washed data and log etc. now the station boots to a white screen.
Does anyone has a firmware for this station and want to share with me. i will really appreciate any help possible..
kind regards...
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AQUALISA electric shower
The controller starting when is powered and waiting for ON/OFF button command.
The ON/OFF button is made with an optoelectronic device which detect your finger, but is not responsive to anything.
Photos on next ...
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desoldered capacitor is self charging until 0.6 voltage.
I have an 21 inch CRT TV which is not able to power on.
I disassembled 21 inch CRT TV and measured voltage of main filter capacitor(Samhwa HC 400WV 220uF) in the circuit.
It shows 270V on my DMM.
So I discharged this main filter capactior completely and detached circuit board from cathode-ray tube.
Then I desoldered this main filter capacitor from circuit board.
But I noticed that this desoldered large capacitor(Samhwa HC 400WV 220uF) is slowly charged by itself until it reached 0.6V
I measured its ESR value with MESR-100 and it shows 0.1 ohm,judging...
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QN750Q8FNBFXZA Service Error Codes Needed - Error code 1-3-1-2 ? Dead set, only blinking standby light in repeating sequence
I am working on a QN750Q8FNBFXZA. Dead except the standby light. It blinks what appears to be 1 3 1 2. 1 long blink, pause, 3 short, pause, 1 long, pause, 2 short, pause, repeat. A service manual would be very helpful, or if anyone knows these error codes. Thanks!
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IdeaCentre B320 - CIH61S V1.0 schematic
Hello community
I need schemaic for Lenovo Ideacentre B320
motherboard: CIH61S V1.0
Thanks...
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macbook pro a1278 clean me
Hello, can someone help me clean the area of my original file?
820-3115-B
There was slj8c on the device. I wanted to say that I read that slj8e works on many devices, but I could not get an image. I want to try it with a region-cleared file....
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Lenovo Legion Y520-15IKBM - No power besides the main rail
Hello people,
I've got this laptop not working for repairs, and as you can see something was done to it as you can see in the coils PL58XX (which I for some reason cannot find in the schematics...) The first FET (PQ201) was not an original part and a questionable one at that and the second one (PQ202) was shorted. Both are N-channel. Ordered replacements for them and replaced them after arrival. Now I have encountered another problem: there is no power at the second FET. By following the thread linked I got to the injection part. Applied 0.8V at 1.5A, but couldn't feel anything getting hot,...Technical discussions covering any type of laptop, notebook, netbook, tablet, or smartphone. Any and all brands and models welcome. When starting a new thread, please put the make AND model of your device in the thread title. Also be VERY descriptive of your issue, that way you'll get the best answer possible!
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DIAMOND CRT TV MODEL DTV-29T 76 TRUE FLAT TV
HI I have a break in the EHT wire that connects to anode that goes into the tube i.e noticed light beaming out from a tiny section of the wire and sparks on a component on the pcb.Please advise the best method to repair the eht wire i.e what type of glue can i use.thank you.
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need bios acer N20C2 FH52M LA-J891P
hi, can anyone be kind enough to create the bios file for me? I attach the backup I read and the original bios downloaded from the Acer website
serial NHQ8KET00204410E333400
THANKS...
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acer chromebook 315 locked
hello every one
i have bought seconde hand chromebook i fund that its locked by administrator by serial number can someone help me with this
i tried rcunlocker nothing happend enrollment dev mod nothing CHANGED IN bios
when i change serial number laptop wont turn on ( i change only one number in bios bin not everythin)
can someone help me with it!!!!
the serial number is NXHKAEF006321039717600
ORIGINAL BIOS BIN...
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Hi Need some help to get the warning message remove for my hp z2 g9 sff workstation
I recently bought a hp workstation on marketplace. I think i got scamed. I ending up with a sample mechine? It has a QS CPU in it. But now there is a very annoying warning message every time I boot up
Is there anyway I can remove this? I see some forum post that mention about sssm.bat. But can anyone provide more detail about it?
Thanks
John
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HP Probook 640 G5 - replaced blown components, getting power led, fan full, 5-flashes on CAPS Lock and NUM lock, black screen
Hey guys, bit stumped with this laptop after replacing 2 blown components i.e., MP86493, MP2979A.
To begin with, this laptop was dead-dead.
Now with replaced (visibly) blown components, i do get some progress; after connecting battery or main cable;[LIST][*]am getting white power led[*]5-long-flashes on CAPS Lock and NUM lock[*]then, fan full speed[*]CPU heats up some (smaller die PCH, does not)[*]always constant black screen no matter what's tried[*]no USB recognition[*]no HDMI output[/LIST]this is as far as I can get with it and not sure where to inspect next ?
...
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A2338 Trackpad and keyboard not work after somtime.
A2338, after sometimes trackpad and keyboard not work, and USB keyboard and mouse work all time,
changed UT360, UT301. Diode value dropped in PP1V85_S2_IPD from 443 to 200. then i will replace that both IC and again value increase. same repeat. any idea, what to do,
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Acer Nitro 5 FH52M LA-J891P no display
Hi everyone,
Acer Nitro motherboard FH52M LA-J891P Rev.. 1B
The laptop arrived with a short circuit on the main power supply line +19v
After measurements and a short circuit test it was discovered that PQZ2 (AON6962) and PQB11 was damaged. After removing it from the board, the short circuit on line disappeared.
once the components have been replaced the mainboard now starts but does not give any image on the screen.
the fans spin, the keyboard lights up but no image. if I put a USB stick with LED it doesn't flash. If I remove and insert the power supply...
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Need Help to Fix G7AD-2G DAG7AMB38C0 Rev: C bios.
Please fix this Bios.
I got +3VS5 and +5VS5 but Power and Battery LED won't turn on, board cannot switch on.
S/N# 5CD9194QW1...
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Gigabyte GA-H61M-USB3-B3 dead short 3.3v rail to ground.
Hi there,
I discovered this forum through a youtuber who teaches electronic repair. I've been trying to troubleshoot my dad's old PC which is a Gigabyte GA-H61M-USB3-B3 and will not power on. I discovered a dead short on the 3.3v rail at the ATX connector so I used a bench power supply to feed 3.3v into the ATX connector and sunk about 400mA into the board (I hope that's not too much!). I used a FLIR camera to identify the problem area:
[ATTACH=JSON]{"alt":"Click image for larger version Name:\tFLIR_20240327_013040_549.jpg Views:\t0 Size:\t1.25 MB ID:\t3243182","data-align":"none","data-attachmentid":"3243182","data-size":"full"}[/ATTACH]...
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Dell inspiron-24-7459 resistor value
Hello.
I need to learn the value of the resistor shown in the picture, if anyone has this card, can they learn the value of the resistor?1 Photo
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Hiopos - Cash Touch - Doesn't turn on
Hello,
I have this Hiopos Cash system running on android that stopped working without notice. The power supply is ok, there's light on motherboard but when pressing power button it doesn't turn on.
I've google for schematics but no luck. Motherboard is S2802_V1.3B. I've took some measure and maybe it could be a transistor, the one I am pointing on with the orange arrow on the pics. Does anyone knows this board ?
Thanks
Sam...
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Clevo 6-71-NL4L0-D02 schematic
Hello
I need schematic for motherboard Clevo 6-71-NL4L0-D02
Other code; NL40LUMB-0D
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