Hi i need help with a Dell latitude 14 5420 GDF40 LA-K491P Rev 2.0 (A01) 2020-11-16

[djpaesgana]

Hi i need help with a Dell latitude 14 5420 GDF40 LA-K491P Rev 2.0 (A01) 2020-11-16 , it charges on usb type C i checked the charger with a pd decoy and a electronic charge its ok when, i tested the usb c jack with a tail tester it reads ok [ATTACH=JSON]{"data-align":"none","data-size":"thumb","data-attachmentid":3637350}[/ATTACH] (photo incluided), then with a usb charge tester it looks like its trying to negotiate the PD but ressets i openned the laptop and with a thermal camera i noticed 3 ICS getting hot the TPS65994 (UT3) the ISL95860HRTZ...

[BobbyMJ]

Hi All,
Wanting to learn some electronics repair skills.
I found a non working Panasonic TC-P60S30 and this is my first project / attempt.

So far I have found a blown cap on the main power supply board.
After replacing it there's still no standby power.

Poked around and found a resistor on the PSUB power supply board that measures open.

An online resistor calculator shows this is a 93k ohm resister.

My questions:

Is that correct, 93k ohms?
Is it a fusible resistor?
Lastly, how do I know what wattage?...

[kuba2102]

Hello. As in description, TP and KB are not working when connected to the OEM display (working one). The angle sensor was damaged by a water, other than that I cannot find any more liquid damage or even stains. I took the bezel off the LCD to inspect but it looks intact. when I connect a spare LCD it works like a charm. I never seen before a laptop where KB and TP would work due to a display that is displaying without any issue. Any idea?

[CapLeaker]

Hmm… someone brought me this Miller Diversion 165 TIG welder for repair. Claim is it doesn’t arc. Well it tries doing something if I put the tungsten tip straight to the aluminum plate. All I hear is a little tick… tick… tick…, I have the power LED on, but the other (blue?) LED doesn’t light up. I think it is supposed to when there is an actual arc.

So I opened it up, found a bad looking connector between the main board and the small HF board. Checked the SCR and few other things on it and found nothing. Then tried again. Same thing. I will not for its own life strike...

[JSBJSB]

Hello everyone,

so I have this problem with this OLED that had a LED blinking issue at first.
It was blinking twice so it means according to similar service manuals (I cannot find the proper one) EVDD 24V SOS, Panel or TCON Fault.
Also, the connector from PSU to TCON which supplies 24V was burned (changed it) and saw threads about this topic but didn't relate completely to mine.

First thing was to tape the signal ERRORDETECTION so it would try to initialize. And it didn't so I unplugged the panel from TCON.
Then it started up and went to green light...

[Andriy Andrusyk]

I'm planning to buy a used[B] MSI GeForce GTX 1080 Ti.[/B]
The seller has provided photos, which I've attached to this post. One of them shows some visible damage — I'd appreciate your opinion on how serious it might be.

What other potential issues should I look out for with this card?
What are the key things I should check before finalizing the purchase?
Also, how can I best protect myself from being scammed?

Thanks in advance for any advice!I'm planning to buy a used[B] MSI GeForce GTX 1080 Ti.[/B]
The seller has provided photos, which I've attached...

[bulkchart32]

nichicon [TABLE]
[TR]
[TD]1500 µF 16 V Aluminum - Polymer Capacitors Radial, Can 8mOhm 2000 Hrs @ 105°C[/TD]
[/TR]
[/TABLE]
are what i used because i had heard the voltage doesn't matter as long as it is more than the original cap. i'm now reading that high voltage may make the cap's esr too high. is this a good cap for replacing those oem ones?

1500 µF 16 V Aluminum - Polymer Capacitors Radial, Can 8mOhm 2000 Hrs @ 105°C

[eccerr0r]

I have a SOT23-5 marked

"13D1 S"

I wonder if anyone recognizes this IC? It should be a LiFePO4 protection IC, but having problems finding the datasheet, anyone recognize this?

G00gl3 returns a 6-pin LDO which is not quite right...

[Jofka]

Hello, I received a defective ProDesk 405 G4.
There are signs on the motherboard that someone has already done something.
Need help identifying the missing transistor.
Schematic if available.
Thanks in advance

[welldigger99]

Hi Guys,
I need to replace the dual rail power supply in this unit (board damaged irreparably - by me!).
I have the schematic (attached) - but it does not (unhelpfully) show the value of the Pos and Neg rails.
Someone has suggested possibly + and - 42V, but as the smoothing caps are only rated at 50V this could be a bit close to the mark.
I am hoping Alxxxxpress might be able to come to the rescue and I am thinking somewhere in the 32V 8A region? Any suggestions/observations would be welcomed.
Many thanks.



[ATTACH=JSON]{"data-align":"none","data-size":"thumb","data-attachmentid":3637085}[/ATTACH]...

[kevin_allein]

Hi, I bought a RT809F from China. When I connect it to a LCD Monitor with HDMI, it auto detects the EEPROM and can read and program it.
However I have 2 different 8 pins EEPROMs and wanted to read them out. It neither detects the ICs correctly, nor can it read them even if I select the device.
If I measure voltage between pin 4 (GND) and 8 (VCC), I measure 0V. Obviously operation cannot work without voltage.

Any tips what I am doing wrong ?...

[MAHMAOD RADWAN]

Got dell g15 5510
la-k662p rev 1-0
service tag G33G8F3
bios read using Universal BIOS Backup ToolKit 2.0.exe
issue :TPM Alert...

[adiasterix81]

Can someone help me remove password?
Hp elitebook 630 g11
sn 5CD44655D7
Motherboard: DA0X8UMB8F0 REV F...

[hamma_tn]

Hello everyone, I hope you're doing well.

I need your help, please. I'm trying to understand if it's possible to remove the supervisor password on a [B]Lenovo ThinkPad T14 Gen 4 (AMD version)[/B].

I've read several threads on the forum, but I couldn't figure out which method actually works for the [B]T14 Gen 4 AMD[/B]. Some mention using a motherboard jumper, others talk about a special USB key, and I also saw something about using an SVOD4 device.

To keep it simple: Is it possible to remove the supervisor password on a T14 Gen 4 AMD?
If yes, what is...

[Keyvu73628]

Hello, is there anyone who would be able to help me locate and provide an image or guidance on where I can find the bios chip on the motherboard of the ThinkPad L14 gen 2 intel version and how I could remove the bios supervisor password.

I bought the ThinkPad used so no luck in getting any company help with the password so I want to flash it and remove the password if possible.

Note: I was being an idiot and reset CMOS resetting date and time on the laptop resulting in not being able to access the nvme drive with windows on it until I set time and date (which can't be...

[Günter Schuch]

hallo leute ich habe ein problem mit meinem laptop der marke Schenker XMG P407 und zwar ist mir anscheinend der Grafikchip gtx 1050ti der direkt auf dem motherboard verlötet ist kaputt gegangen sie ist im Gerätemanager nicht mehr aufgelistet. deshalb hoffe ich hier unterlagen für das gerät zu finden. soweit ich herausgefunden habe wird die Platine die bei der firma Schenker verbaut wird von Clevo gefertigt und zwar mit der bezeichnung "Clevo P641HK1" ich hoffe auf eure hilfe und bedanke mich.

Hello folks I have a problem with my laptop of the Schenker XMG P407 brand...

[lrservicios]

Hi i have !!!
[B]HP Victus Gaming 16-r0016ns[/B]

part number : 836P5EAR#ABE S/N: CND3201SCX

iT HAS bios password, can some one clean it for me please ??

Thank you in advance !!Hi i have !!!
[B]HP Victus Gaming 16-r0016ns[/B]

part number : 836P5EAR#ABE S/N: CND3201SCX

iT HAS bios password, can some one clean it for me please ??

Thank you in advance !!Hi i have !!!
[B]HP Victus Gaming 16-r0016ns[/B]

part number : 836P5EAR#ABE S/N: CND3201SCX

iT HAS bios password, can some one...

[EgOPhil]

Hello everyone,

the IC labeled “D4W28” gets hot after a few seconds and the iCharger stays off. I have measured the components around the ICs “AL114” and “D4W28” and they are all OK.
However, I have the problem that I can't find the ICs and therefore have no datasheet. Do any of you have the datasheet to hand? Also, do you know where I can buy these ICs?


Thank you in advance,

Phil

[rumpumpel1]

Off topic, but I think I have the best chance to get an answer here: Which programmer can read a Winbond W25R256JW (not W25R256JV) ?

[DmitriiR]

bios bin просьба
HOC70 LA-L801P
IADLPSC1
REV 1.0

[ATTACH]n3636723[/ATTACH]...

[minaedward]

Hi all
I have an Lenovo Thinkbook 14 G2 laptop with no picture
when pressing the power bottom the ESC and Caps lock led are on then the Caps lock goes off and ESC stays on but with no picture
earlier it startup but freeze at Lenovo logo
All voltages are present so I suspect the onboard ram
I flashed a disabled onboard ram Bios but with no success
There is a memid section on the schematic which I believe it concerns about the onboard ram
but I don't understand it
Anyone could help me with this issue is appreciated
(attached the memid part)...

[dqtech]

ic burn...please help identify...this laptop can on but only without cmos and battery....and another problem is when laptop on, i can hold power button to turn off the laptop but when press power button again it wont turn on...need to disconnect charger and plugged in again to turn it on...

[Gilbertps90]

Dell Precision 5690
Service Tag: 4VXFS64

Bios Dump file please

[Carlito Jr. Tiopan]

somehow the nvr got bricked and the powersupply is not working only power indicator and no display . badly need a bios dump file for
Model: DS-7608NI-Q1/8P
Serial: C61546345...

[CapLeaker]

Anyone has a schematic for a Stanley SMCU-5 KHR1780 Excavator Controller to share? Its a 24V system. The one I am working on has all 4 MOVs burnt, a hole in the board where the 5 electrolytic capacitors and that heat sink is and a small smd cap decentegrated. The blown MOVs smells so baaaaaad. My truck stinks and by now half of the house too! Just waiting for wifey to ...

[andrew25]

i have a locked hp probook 460 G11 with bios pass, help unlocking..
mobo: da0x8vmb8g1 rev G
S/N: 1H84311K9G
PROD ID: 9Y7S1ET#BH5...

[reessi]

Hello!

This machine had the classic fault that all these motherboards have which is the loose pins on the RAM slot.

I soldered them as I have done on a few other of these and then it posted.

Everything works, fully installed with Windows 11 etc.

Only fault is when it has gone to sleep and you turn on again the screen is blank with no backlight and the caps lock does not work so I assume it has frozen completely.

Only way to get it to post again is to remove the battery! No amount of forcing off and on will get it to post!
...

[mferna14]

Hi friends., I am working on MacBook Pro A2159 touchbar 2019. The old logic board was liquid spilled so I ordered another logic board from AE. Received it & all worked fine till I got to the Chinese login screen where the login screen password tobe entered. I tried to reset the password but it again gave me options which I do not know about the Apple ID. I formatted the onboard SSD. & wanted to change the startup boot sequence but in order to change it, again the password is needed for that too. Is there a way to get rid of this password?? The seller has not replied back past 2 days, how...

[Ierwin]

Hello everyone,
Ive got a [B]UE60KU6079[/B] on the workbench that is giving me some headaches trying to troubleshoot.
The previous owner stated that there had been white dots on the screen which from the description sounded like some lenses fell of the backlight LEDs.
He had opened the TV from the back, trying to get to the backlight, supposedly gave up, reassebled everything and gave the TV to me.
I expected the worst like ripped COF cables or a cracked panel but could not find anything like that yet.
Anyway I still fully expect that there has been something seriously...

[MicroSMD Lab]

Hi group, this laptop came in powering up but no display on either internal or HDMI. I cleaned ME of the bios (not sure if I did it properly, I followed SMDFlea's video guide but there was no file named "ME Region.bin but one named "ME Sub Partition.bin" so I used that name instead) and I get output on HDMI now.
The model name is 81Q4, board number NM-C531 Rev 2
Initially I got no +LCD_VDD voltage at the eDP connector but after testing U9 and U4406 I got 3.3V, no soldering or replacing components.
Now I get what I think is backlight (the logo lights up behind the...

[Andriy Andrusyk]

I recently bought a used GPU that was advertised as an [B]MSI GeForce GTX 1080 Ti[/B]. The backplate label also identifies it as a GTX 1080 Ti, and the label looks untampered.
However, when I run [B]CPU-Z[/B], it detects the GPU as a [B]Radeon RX 480[/B].
I inspected the PCB and found a second label near the gold connector reading: [B]V341 VER:1.1[/B] From what I've found online, [B]V341[/B] PCBs are typically used for [B]Radeon RX 480[/B], while [B]GTX 1080 Ti[/B] cards usually use a [B]V360 PCB[/B].
Is it possible the card was BIOS-modded or relabeled? What's the most reliable...

[tommy97]

Hi,

i've got HP Omen 15-dh0007na which come with no display (works externally). Tried new flex & LCD, still no difference, i assume that there is no image/backlight as i couldn't see anything. Also tried to do me region on it BIOS, still same thing. Any ideas?

Board: LA-H482P

[rumpumpel1]

Can anyone provide the schematics for a ThinkPad L13 Yoga Gen 4 AMD?

[ronaldopdias]

[B]Symptoms:[/B]
No keys work apart from F1, F7, F12 function keys such as keyboard brightness, touchpad enable/disable.
Keyboard RGB works okay and might be adjustable.
VERY occasionally it may function but most of the time it is dead.

The fault is down to the USB data lines not going low when the bus is idle. The keyboard connects over USB, so the issue on the USB data bus causes it to stop functioning.

[B]The fix is to fit a 1K resistor to the daughterboard that the keyboard + trackpad connect to. [/B]The daughterboard is located beneath the battery....

[beal]

hi

Plase Bios Rom MB ECS H61H2-A2 Deluxe V2.0

thanks

[yeastyelectronics]

Hiya! Does anyone have a boardview (or similar) for an AMD M15 R7 - and spec of this variant will help!
Alex

[meharshahzad720]

Need bios...

[atmega4]

help to extracte the dump bios from this update on officiel site gigabyte for the bios 32mb bute on this update is 37mb
Gigabyte Aorus 16x 2024 i9 14th nvidia 4070
model : x6lag
model no : be200ngw...

[Elecfronicsssss]

Need the schematics in pdf format also can i view boardview file from mobile...

[alfredposadas09]

a2251 820-01949 usb c amp meter malfunction when battery is plugged, can someone help me to troubleshoot this? no short on sda and scl lines and 3.3 voltage on both lines

[m1ch43lzm]

Hi, this is my personal laptop, which the original board (lets call it Board A) blew up PU8700 (TPS51486), making a hole on the board, i had left the laptop at my desk one day with the battery fully charged and didn't touch it for a week, but when i tried to turn it on it didn't
Thought the battery was dead, so i plugged in the charger then tried to power on, the power LED blinked once, charged LED still orange, unplugged the charger, plugged in again and I noticed the "magic smoke" smell, so i unplugged the charger, removed the back cover and saw the blown IC (the "magic...

[Elecfronicsssss]

Finding the power button track but the track is destroyed need to trace where the power button supply rails is.

[AnguiXD]

I have a dell g3 mb la-f611p and it has no image
Already tried the external screen but the result is the same
Bios was corrupted because it wasn't even powering on, after flashing it started booting
It seems to work, it responds to cntr alt del command and caps/NumLock.
Appreciate some help with it!

[valente222]

Hi, I'm repairing this Chinese SG2701B01-7 panel. There isn't much information about it. The original part for the panel is a CSOT CS601C regulator. I can't find anything commercial on Aliexpress; there's only the CS601 without the final 'C'. They claim it's a variant. But will it be compatible? Well, my diagnosis on this screen is a video problem; the image is practically black, although there is HDMI communication. The LED light is on (backlight), but there is no VGL, no 3.3V, and no VSS. It seems that this IC is the one controlling these voltages. The monitor worked correctly for a moment and...

[Fide]

Hello guys,
I try to repair a PS5 with a WLOD.

At the beginning I should tell that I get a BLOD and after the UART reading and shorts on the caps near by the HDMI Encorder I change the IC. And after the change I get a WLOD. I also noticed that the filters was blown. I change them also.

The caps near by the HDMI Encorder are not shorted now. I also change the HDMI Port.

I get some readings in Diode Mode which doesnt look right to me.

1. HDMI Pin 18 i get 0.100V and Pin 19 OL
2. Diode on the back side 0,100V...

[sordids999]

Hi
Really stuck on this TV
I'm thinking it's a bad screen ?
Voltages all seems good
Tcon 12v ok
Remove one tcon cable at a time no half image on the screen just backlight and no picture
even tried the tape trick still no luck

Thanks...

[hakuuart]

Hello everyone, I need some help or advice regarding the HP Smart Tank 750 device. I have already checked for paper jams and anything stuck inside, as well as all the flex cables, but I still encounter an E4 error. We have taken it to customer service for inspection, but they don't know how to fix it. Is it possible that the issue lies with the main board or the sensor? I would really appreciate any guidance from those who have experienced this problem. Thank you!...

[mhd_mahad]

please I need to fix my dump
sn#8cg2373q03
6G7R9EA#ABV
Original BIOS file is attached. Thank you.
appreciate your support...

[aquif]

Acer one 14 z8-415
s/n- UN599SI0303322567E0700
SNID- 33215321407
BOARD PART NUMBER- ip3_tn1_mb_v41_20211229a...

[Mirenia]

Hi everyone,
I've got a Samsung UEMU6199U which has no Standby LED and no reaction if try turning it on.
Voltages on the power supply board is okay. Backlight test is also okay.

I read about a corrupt firmware on IC1604 on some models, did a dump of this IC and turns out: First sectors are empty.
So I think my TV has exactly this issue.

Can someone please fix the dump?

And how do you do that?

As I understand you fill in the empty sectors and leave the rest as it is. But where do you get the "information" of what you...

[Youness]

Hi All,

I'm sharing the [B]Clevo NV40MZ-NV41MZ [/B]service manual including schematics ([B]at the end of the document[/B])

enjoy!!!!Hi All,

I'm sharing the [B]Clevo NV40MZ-NV41MZ [/B]service manual including schematics ([B]at the end of the document[/B])

enjoy!!!!Hi All,

I'm sharing the [B]Clevo NV40MZ-NV41MZ [/B]service manual including schematics ([B]at the end of the document[/B])

enjoy!!!!Hi All,

I'm sharing the [B]Clevo NV40MZ-NV41MZ [/B]service manual including schematics ([B]at the end of the document[/B])...

[pauleccleston]

Issue: Windows Update pushed a broken BIOS update to the machine, resulting in a total lock up during BIOS update and bricking of the machine (no screen output, CAPS lock permanently on, only fan turning and power LED on). If anybody could help with getting the machine back up and running i would be extremely grateful.

Details as follows:-

Make/Model: Lenovo/E585 (Laptop)
Type: 20KV-CTO1WW
S/N: PF-1PFYB3 19/04
BIOS chip: Winbond 25Q128FWSQ 1844

Dump of corrupt BIOS attached as zip....

[im_trying]

Hi, thanks for helping.

The motherboard is from a gaming laptop, msi gf65 thin 10ue, 16W21/11S.

For starters, it doesn't power on. I measured a "short" on the second DC-IN mosfet, right around the charging port but I don't know how to find the component that's shorting it.

I already tried checking the mosfet for internal shortage (by desoldering and measuring) but no short. The drain on the motherboard is the one that's shorted, next to the gate (that's not shorted).
The photo below shows this better than words.

Thanks for anyone...

[rmfr1225]

Hello everybody,

I have the schematics already of this device but no boardview and it is being very difficult to locate the fault.

I have +3P3VAS but then nothing else, I suspect something related with 1V8 regulators, but without boardview it is very difficult to locate those components and or pads to test.

Does somebody has the boardview of this model? Or can point out where to test?

Thanks!

[Elecfronicsssss]

Laptop motherboard DA0NJJMBAG0

PROBLEM-WHEN I PLUG THE CHARGER WITHOUT BATTERY THE CHARGING LIGHT BLINKS AND WHEN I PRESS POWER BUTTON THE CHARGING LIGHT STOPS BLINKING AND STAYS ON BUT THE POWER LIGHT DOESNT TURN ON AND LAPTOP ALSO DOESNT TURN ON NO FAN SPINS NO KEYBOARD LIGHT.

CHECKED- ON S5 STATE TGE LAPTOP HAS 5V ON USB 3.3V BUT I DIDNT GET 1.8VOLTS ON BIOS PIN NO 8 WHILE PLUGGED IN AND EVEN ON S5 STATE.

GUIDE ME WITH THE PROBLEM..

SUMMARY-
1.NO 1.8VOLTS ON BIOS PIN NO 8.
2.S5 STATE ((PRESSING POWER BUTTON)))VOLTAGES ARE PRESENT...