Hello all, i have problem with another laptop which is HP pavilion 11-k028TU with mainboard hevin-bsw mb 14269-1. i dont have schematic or boardview. the laptop couldnt turn on. when i check in the W25Q64FV VCC pin which is bios ic, it show 0.xx milivolt. when i trace the rail, that pin go to KB9012 IC pin 125. when i check pin 125 and 124, it appears 3.xx volt with different value. i have check the resistor between that connection but it read slightly bigger than VCC BIOS chip but still in 0.xx milivolt. could it be because dead bios ic? or bios ic not properly soldered?
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Re: Laptop HP pavilion 11-k028TU VCC 3volt exist in IC, but disappear in VCC bios chi
1) check and post the resistance of the resistor between the bios and the kbc. This resistor may have been damaged by someone trying to reflash the part while on the motherboard.
2) with the meter in resistance mode, check the resistance to ground for the VCC pin of the bios. Then check again the resistance to ground on the other side of the resistor that may be damaged. If the series current limit resistor is damaged, it will not pass through the required voltage and current to power the bios chip. -
Re: Laptop HP pavilion 11-k028TU VCC 3volt exist in IC, but disappear in VCC bios chi
1. the resistor near ic bios is 24.7k and 24.5k or 100k is with color black/brown, i read 2 different value with different ground, other resistor is near kbc read 24,7k and 24.8k. there also resistor read 2.2k but became 23.4k when change the black probe. there also 9.81k became 38.1k ohm.
2. resistance from vcc bios to ground is 24.6k ohm, when i check with bleeper mode it not show short to groundLast edited by ndarjo21; 01-11-2022, 03:37 AM.Comment
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Re: Laptop HP pavilion 11-k028TU VCC 3volt exist in IC, but disappear in VCC bios chi
Post a clear picture of each resistor you are measuring. Show the flash memory device as well.Comment
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Re: Laptop HP pavilion 11-k028TU VCC 3volt exist in IC, but disappear in VCC bios chi
actually my phone camera is bad and i dont have any microscop or magnifier. but i have check again. actually, the vcc in bios not connected to vcc kbc. vcc kbc is in pin 125. and vcc bios connected to pin 124 which is V18R. and V18R is 0.6 mvolt. so can it be kbc failure?Comment
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Re: Laptop HP pavilion 11-k028TU VCC 3volt exist in IC, but disappear in VCC bios chi
the bios ic chip i dont sure it is 3 volt or 1.8 volt. because the V and W look same. but i think its W, which is 1.8 volt, try get water in top of it and flaslightLast edited by ndarjo21; 01-11-2022, 04:23 AM.Comment
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Hi everyone,
I have been doing hardware repair as a hobby for some years now and recently decided to learn about repairing laptops as a fun challenge.
I managed to get my hands on a "HP Pavilion Gaming 15-ec2523nd" notebook that only shows a white power LED and doesnt respond to anything.
After initial testing I concluded the bios seems to be corrupted since all voltages are normal and there are no shorts. HP has a feature for a bios restore from USB with winkey+B for this model. This did not work.
I have desoldered the bios chip (GigaDevice... -
Hello everyone,
I’m currently working on a dead MSI GP75 Leopard (MS-17E71) motherboard (i7 CPU, NVIDIA GPU) with a no display/no backlight issue initially. After extensive investigation, I’m at a critical stage involving EC firmware, BIOS/ME region interaction, and possible deep corruption. I'm seeking advanced insight from anyone with experience in EC/BIOS sync issues or PCH-level behavior. Here’s a full breakdown:
🧩 Initial Issue- Board powers on (fans spin, keyboard lights up and can be adjusted, caps lock led lights), but no display or backlight
- External display (HDMI) shows
07-24-2025, 02:17 PM -
First of all thanks to all of our members who have posted previously all methods posted here.
Please leave a comment if you find something new,or have anything else to add.
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Find by serial number,model number or series
If you know the laptop serial or model number go to HP support https://support.hp.com/us-en/drivers/laptops .
Enter the serial number or model number and click submit.On the next screen you will have to enter the OS
Operating system and OS version.If... -
Hi, my laptop wont boot at all
With original bios no POST, only LED lights
With alternative BIOS from model TP500LN (flashed via programmer) the notebook works again
Some issues
A- with bios from 500LN, it won't update from bios of model 500LA (from 500LN v203 to 500LA v300)
B- If updated from 500LN version 203 to 300, the battery stops being recognized
Things I tried
1- Update / clear ME: Took the non working bios, made a backup, and did this: https://www.badcaps.net/forum/troubl...theory/trouble... -
Hello, I have an old Dell G3 3579 (ST: 2WQ7LP2-8FC8) with a newer 8FC8 BIOS password. I have successfully attached to the flash chip (W25Q128JVSQ) on the motherboard with a CH341A programmer and made several modifications using Intel FIT (e.g., allow software SPI write) without bricking. I was also able to boot to a modified GRUB shell where I attempted to edit many BIOS security related options like BIOS Guard/Lock, Flash Signature Override, ME FW Image Re-Flash, etc.
Unfortunately, some of these modifications like to Intel BIOS Guard failed because it is fused into the PCH. Also,...
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