Recent content by Mario Mancari

hi, why is the multimeter used in diode mode with the red probe at GND and the black probe on the components. is impedance measured? for what? what are the reference values? thanks.

All disconnected. Only the connected fan

Sorry pin 1 and pin2 j9000 shorted to ground

Replaced L9004, u9000. The few 6.5v on DCIN are back. i noticed pin 2 and pin3 of j9000 shorted. checked c9015, c9012, c9011 and unplugged u9000 but remains shorted. could be the cause of the little dcin? Could it be video card? I bought a new board work and the display works Power jack dcin...

can this short be the cause of the no power and no green light? Advice on what to check to eliminate the short? Thank you!

Why did L9004 explode? problem in the rail? now i have 0v with the charger connected

i am already testing the motherboard on the bench. only the cooling fan is connected. Now the board is with L9004 exploded and I will replace it as soon as possible.

After powering the board with 16v L9004 exploded

power jack dc when unplugged from the board generates 17v. when i connect it to the board it drops to 6.80v. I buy it anyway. The charger is new

I bought a macbook with 2936A without green light. The old owner says he saw smoke from chargers. -F6905 OK but dc in is 6.80v -3.42v ok -ppbus nothing -U7000 replaced and checked all nearby resistors. Still nothing fixed. U7000 Pin: 17/18 = 1.1ohm 27/28 = 20.2ohm r7010 pin 1 = 6.80v /...