[FONT=Calibri]I have a Samsung power board BN 44–00 874C that is dead. I have looked for a schematic but no such luck. I opened it up and found two Mosfets burnt QP801CS and QP802CS, also the main fuse. I replaced them and checked the two blue capacitors in front of them. They both tested good. I checked the Diode on the same heat sink and the two capacitors in front and they checked out OK. I plugged it in again and that blew the fuse and the Mosfets the second time. I plugging it in again hooked to a 100 W watt light bulb. The light bulb starting started...
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by SMDFlea
04-17-2025, 08:21 AM
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[FONT=Calibri]Hello,[/FONT]
[FONT=Calibri]I have a Samsung power board BN 44–00 874C that is dead. I have looked for a schematic but no such luck. I opened it up and found two Mosfets burnt QP801CS and QP802CS, also the main fuse. I replaced them and checked the two blue capacitors in front of them. They both tested good. I checked the Diode on the same heat sink and the two capacitors in front and they checked out OK. I plugged it in again and that blew the fuse and the Mosfets the second time. I plugging it in again hooked to a 100 W watt light bulb. The light bulb starting started...05-08-2025, 12:49 PM -
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...Yesterday, 08:12 PM
-
Hey everyone. I recently acquired a PS5 that is not turning on (no beep/power). PSU is good and there is no shorting on the 12V rail.
It came with a Gen3 SSD installed so I feel that things went down hill for the previous owner when it was installed. F7003 was blown but there was nothing shorting to ground. I replaced the fuse but still no power (new fuse is still good for now).
When connecting it to a bench power supply, it only pulls 10 mA (doesn't spike when first connected).
I noticed that there are a couple capacitors missing from the Vcore power regulator (pictures attached)....Today, 04:24 PM -
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...Yesterday, 10:41 AM -
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!
...05-13-2025, 05:20 PM -
Toshiba Satellite r945-p440
Motherboard: FAM2SY2 A3256A
I do not have a schematic or board file
I usually let it go to sleep every time I use it because it is nearly always plugged in, with occasional shutdowns to reset things. Then it started to hard crash every time it tried to come out of sleep. The lights would come on for half a second but before anything shows on the screen they would all shut off and it would boot up as if I had shut it down completely (except that windows knows it didn't), and when it comes back on the fan ramps up to full and stays there perpetually...04-16-2025, 05:31 PM -
Hi all,
I got a 16inch MacBook Pro showing 5v and 0,3a on the left ports and right side has one power cycling and one showing nothing. The one cycling shows 30c under thermal camera. Surrounding components show no corrosion or any shorts.
Any ideas what to check next? The whole board looks clean compared to the other A2141s i saw....04-25-2025, 11:40 AM -
I bought 5 of these chargers as parts/not working from the same seller. Upon receipt all were dead and had blown or missing 3A fuses. Upon connecting to mains I find there is +330VDC across the filter cap and nothing past that point.
TOP268EG is visibly scorched on all 5 units, with the scorch mark being between drain and source pins. Is this a common fault or have these chargers all been killed simultaneously by a power surge?
Any ideas what else might be damaged? I am in the process of tracing a schematic for these parts05-07-2025, 09:35 AM -
hi to all i want to ask if its possible tell me your opinion if acoording with the video is display problem ?
thanks on advance...Today, 02:35 PM -
Hello everyone,
I'm having a hard time dumping the BIOS of a [B]Lenovo Ideapad Duet 3 (11IAN8)[/B]. The chip is a [B]Winbond W25R256JVEN[/B], directly soldered to the board in a [B]WSON8 package[/B].
Since there are lots of tiny components near the chip, I was hesitant to desolder it using hot air. Instead, I soldered thin wires directly to the chip's pads and connected them to a [B]CH341A programmer[/B] (photos attached).
The chip is detected correctly in both [B]NeoProgrammer[/B] and [B]ASProgrammer[/B], but I'm unable to get a consistent dump. I've tried...Today, 01:01 AM
-
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...Yesterday, 08:12 PM
-
Hey everyone. I recently acquired a PS5 that is not turning on (no beep/power). PSU is good and there is no shorting on the 12V rail.
It came with a Gen3 SSD installed so I feel that things went down hill for the previous owner when it was installed. F7003 was blown but there was nothing shorting to ground. I replaced the fuse but still no power (new fuse is still good for now).
When connecting it to a bench power supply, it only pulls 10 mA (doesn't spike when first connected).
I noticed that there are a couple capacitors missing from the Vcore power regulator (pictures attached)....Today, 04:24 PM -
hi to all i want to ask if its possible tell me your opinion if acoording with the video is display problem ?
thanks on advance...Today, 02:35 PM -
Hello everyone,
I'm trying to repair the power supply board from a Lenovo ThinkVision P40w-20 monitor. The board is labeled with the following markings:
- Main PCB code: ILPI-422 VA (dated 2021/11/24)
The monitor is completely dead, no power LED or backlight. Upon inspection, I found a few components that appear damaged, particularly some resistors that are burned and unreadable.
Attached is a high-resolution photo of the power supply board.
Does anyone have a schematic, boardview, or similar power supply that can help identify the...Today, 02:38 AM -
I haveTHOMSON N14C-4BK128
Any help in unlocking the password?
motherboard : IP3 GN10F MB V30 20230607A
...Today, 07:21 AM -
Hi. I have a motherboard PROX 1630-G3A with locked bios (PhoenixBIOS). A master-password was set. Can you help me unlock the bios. Thanks.......Today, 08:22 AM
-
Hello everyone,
My egg incubator humidity sensor kicked the bucket, I read open circuit on it with DMM even in the MOhm range.
So I started identifying this piece of crap and look for a replacement part.
[URL=filedata/fetch?filedataid=384349][ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3637781}[/ATTACH][/URL] [ATTACH=JSON]{"data-align":"none","data-size":"medium","data-attachmentid":3637783}[/ATTACH]
This thing has 6 turns...Today, 08:10 AM -
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 Yesterday, 02:12 PM -
I bought a case of them the battery cells are made in China the charge curve looks decent for 1 amp charging rate there is also a BMS protection board which here is the website link to them
[URL]https://batteryhookup.com/collections/more-featured-products/products/new-full-case-100x-3-3v-2200mah-200x-18650-lifepo4-cells[/URL]
Here are more of the same but the difference is that they do not have the BMS protection boards but have the tabbing on them
[URL]https://batteryhookup.com/collections/lifepo4-cells/products/new-full-case-128x-3-3v-1100mah-lifepo4-power-cells[/URL]...03-09-2025, 02:30 PM -
Hello everyone,
Description : ASUS Vivobook Go 15
Model : E1504G
Serial Number : R5N0CV16Z138229
Product Number : E1504GA-BQ210W
CN : E4RK
MFD: 2023-05
MB : E1404GA_MB REV:2.0
I have a Bios here where the customer passworded the bios to start the system. Can someone help me with this, because I couldn't find the original bios. I am attaching the file with the bios downloaded from the chip.
Thank you very much in advance for your help....08-06-2024, 08:02 AM