Hi I have a problem on this little motherboard on the RST line a red LED stays on
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Hi everyone,
I'm working on a MacBook Air 2020 (A2337, board 820-02016) and running into a strange USB-C issue. I've gone through quite a bit of testing and part replacement, but I'm stuck — hoping someone here can shed some light.
🛠 Original Issue
The machine initially wouldn't negotiate 20V over USB-C — stuck at 5V.
Diagnosis showed PP1V5_UPC0_LDO_CORE shorted to ground.
I replaced U3100 (UF400) using a donor board (A2179), and the machine powers on fine now.
⚠️ New Problem: One USB-C Port Only Works in One Orientation... -
Sr. Motherboard Debug Error Code Solution
1 Intel 845 E9 Bios Related Problem
2 Intel 845 D4 CPU Socket Related problem
3 Intel 845 37 Bios Related Problem
4 Intel 845 7C Bios Related Problem
5 Intel 945GCPE 34 Bios Related Problem
6 Gigabyte 845 2 Ram Related Problem
7 IBM Server A6 A7 Ram Mismatch Problem
8 Asus 845 29 CPU Related Problem
9 Lenovo I946 97 C-Mos Jumper related
10 Gigabyte 845 A0 CPU Related Problem
11 Asrock G31M-VS D7 Bios Related Problem
12 Compaq 845 BD-70G B0 CPU Socket Related problem... -
I have a 2DS that I am working on that has a problem reading SD cards. It knows that card is in the slot (which, means the detect pin is working anyway) but it says it can’t read the card.
Here is what I have done so far:
-Tried SD card in another 2DS and on PC, works great.
-Tried piggybacking another SD card slot (just so I didn’t have to take the other one off), same issue.
-Compared voltage drop readings from a working 2DS to the faulty one. All reads are very close except one, the 7th pin from the left, with the pins closest to you, which I believe... -
I have an LG Plasma TV 60PM6700 for the past ~12 years.
In the last ~3-4 months I have been having some issues.- Problem: It started with random picture disappearing (sound still worked).
Frequency: Happened about once a week.
Solution: Had to turn off TV wait a few seconds before turning it on again. - Problem: Then it got worse and the TV started to shut down and when turning on the no picture just sound.
Frequency: Happened about once a week.
Solution: Had to turn off TV wait about 10-20 seconds and turn it on again to solve. - Problem: TV shuts down
- Problem: It started with random picture disappearing (sound still worked).
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i have a problem with thinkpad X1 carbon gen 2 "LMQ-1MB 12298-2 48.4LY26.021"
The laptop was turned off because the MOSFET was not transmitting voltage. After checking it turned out that the gate pin on the MOSFET was the problem, because it was producing an inappropriate voltage. and it was discovered that the problem was with the Think engine, so I decided to reprint each pin, and finally the mosfet could work properly. However, there is another problem, even though the voltage has been supplied to the laptop, it still won't turn on, there isn't even an LED indicator. After double...