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[SOLVED]820-3437 - Greenlight sometimes.

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gcain

gcain

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These boards are my worst repair rate. I just don't understand them for some reason.

PPBus_G3H = 8.20
PP3v42_G3H = 3.422
SMC_ONOFF_L = 3.418

Everything else is 0v. No PP5v_S5 and onwards.

Every now and then when taking measurements it spins the fan for a second then stops again. It has a green light initially, but I think the adapter is just remembering that it had a green light when it was plugged in before. Once it goes out, I can't get it back till I plug it into a working laptop again.
 
gcain

gcain

New member
If I push the diagnostic / debug port, the board boots up. :/

Let go of the port, it switches off.

Just noticed the MagSafe light keeps going from Orange to green as I touch the board.
 
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larossmann

larossmann

Administrator
Staff member
Remove the diagnostic port and I bet my domain name an MXL6406E is BIOS chip on this board.
 
gcain

gcain

New member
Still experiencing the same behaviour.

Only starts when I press where teh diagnostics port used to be.
 
gcain

gcain

New member
I measured on U5110::5.

It's low then goes high when I press the diagnostics port. A few moments later it starts up.

How do I fix this?
 
gcain

gcain

New member
Replaced R5110, ran a jumper from Pin 1(corroded away) to PP3v42_G3H and boom.
She's happy again.

Mark solved please.
 
S

SMMRepair

Member
Louis, would you mind expanding on the issue with the MXL chip? Does that particular SPI ROM chip cause power-related issues or something?

No thread Hijacking. Closed.
 
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