Hi everyone, first post here – long-time reader though. I have a dead MacBook Air M1 (2020) that won't charge or power on.

Device info:
MacBook Air (M1, 2020)
Model j313ap (A2337, logic board 820-02016)

Symptom:
No charging, no power on at all.

Restore attempts:
Apple Configurator finds the MacBook in DFU mode, as Linux with lsusb: Bus 001 Device 021: ID 05ac:1227 Apple, Inc. Mobile Device (DFU Mode).

It looks like the MacBookAir is in firmware boot loop. I have tried to restore 14.x version and 26.2 (latest) version firmware,...

Hey all,

Been lurking for a while to find a solution to my dead A1990 (board # 820-01326-05, I can't find a bv for that one so I've been using 820-01041 for reference) but have come up empty handed. I haven't really done any diagnostics on electronics like this though so I'm sure I've probably missed something. I've soldered and diagnosed keyboards and cars but this is definitely new to me.

My overview thus far:

After browsing the web one night, I closed the lid while it was on the charger, left it on my desk overnight and it was dead in the morning. No response...

Hi!
I have this TV that won't light up the stby led, won't turn on, etc
Opened it and found all expected voltages in the backside test pads BUT one. There are a lot of +5V sources but one of them, the one that's driven to the backpanel keys module.
There are lots of other +5v points working but this one specifically is dead.
I took a close picture of the area where this voltage is generated
There is a LD05 missing but this may be from factory? Should I short it?
All the thru-board capacitors have a steady and valid voltage on them
The small SMD...

Hi!
I have this TV that won't light up the stby led, won't turn on, etc
Opened it and found all expected voltages in the backside test pads BUT one. There are a lot of +5V sources but one of them, the one that's driven to the backpanel keys module.
There are lots of other +5v points working but this one specifically is dead.
I took a close picture of the area where this voltage is generated
There is a LD05 missing but this may be from factory? Should I short it?
All the thru-board capacitors have a steady and valid voltage on them
The small SMD...

1. g´day! I have a samsung 22" tv monitor to fix. power supply model bn44-00505A. some stuff blown up on the primary, according to research something typical on this model. secondary seems ok. writings on the board say in outputs a5v (standby), b5v (switched) both on the lower 3 diodes on the picture, vamp and b13v (12.8v, both are the linked at the connector that goes to the main board) my question is, are both the upper diodes for 13v? I believe so but wanted to make sure before injecting voltage there to test. I injected 5v on the lower side and standby circuit is working fine
   
2. if

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