Hello
khaahk thank you to try to help me.
I checked this :
PL1 pin 1 - GND = 8-10 ohm
PL1 pin 2 - GND = 10-12 ohm...
Darktron
New Member
Last Activity: 08-12-2025, 09:12 AM
Joined: 05-20-2025
Location: Paris
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Hello,
I tried to flash the Thunderbolt EEPROM with my Raspberry Pi and FlashROM : the chip works (can erase, write, verify BIN file).
I don't know to check now...
What do you suggest ?...Leave a comment:
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Hello,
Thank you for your reply.
The thunderbolt firmware was been updated 2 mouths before the breakdown. This previous owner didn't perform the firmware update...
I tried to flash with CH341, not better.
With my voltmeter, I ckecked VCC on the Winbond chip (U15), it's various voltage between 4V and 0V by loop.
I can manage to replace this chip....Leave a comment:
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Thinkpad T480 is dead (nm-b501)
Hello all,
I tried to repair my T480 motherboard.
The PC can not power off at all.
I tried the USB-C meter on both ports : it's loop on/off. I think I can not negotiate the 10-20V voltage.
I tested with an USB "classic" 5V charger with to USB-C : the USB-C meter displays 5,080 V, 0,02 A with some pics to 2,5 A
The USB-C meter was being tested on other USB-C device, it's works fine.
Thank you in advance for your help.
LINK to Schematic -> https://www.badcaps.net/forum/troubl...b501-schematic
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