the initial issue was not turning on. after that i replaced u7000 for a good know one and it worked. i reassembled and then i notice that it doesnt detect the battery. checked daata lines, okay, repalced u700 again for a good know one. after that i checked ppbus, and i got 12.30v. i thought SMC issue, so i replaced it for another one. it still had 12.3v. after that and turned on for a while, then stooped turning on. after that i reballed the original one and put it back, because i lost green light. now i go green light but it doesnt turn on. where do i go now o this?
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820 2879 not turning on
- Thread starter LetsFix
- Start date
Do you get 0.9V at L7750?
Post ohm mode to ground there; should be higher than 30K.
Lower value points to bad MCP...
"checked daata lines, okay"
Can you post voltage and diode mode readings on both SC/SDA?
If something strange check disconnecting BIL connector.
You can also remove D6950 before touching SMC, or U7000.
Be sure R7000 is OK and post exact resistance between pins 17/18 and 27/28.
Did you try to start in SMC bypass?
Post ohm mode to ground there; should be higher than 30K.
Lower value points to bad MCP...
"checked daata lines, okay"
Can you post voltage and diode mode readings on both SC/SDA?
If something strange check disconnecting BIL connector.
You can also remove D6950 before touching SMC, or U7000.
Be sure R7000 is OK and post exact resistance between pins 17/18 and 27/28.
Did you try to start in SMC bypass?
All testing done with disconnected bill connector. i removed d6950 no change, 12.3v on ppbus whitout battery, solid green light with battery. board now turns on, oddly enough my charger was just disconnected haha. i get 0.9 at l7750. R7000 ok, i measure continuity on it to u700 pin 12, like schematic says. pin 17-18 i get 3.2ohm and in 27-28 i get 20.4ohm.
Sc and SDA data lines are open to ground, and with charger connected i get 3.42 on both of them.
Sc and SDA data lines are open to ground, and with charger connected i get 3.42 on both of them.
well problem solved. SMC replaced again did the trick. and fucking bill connector damaged too. i have a questrion though, why did the first replacement do nothing?. i took it from a board that had a broken processor, but that i knew it was good, because it worked before thery let it fall!
"Sc and SDA data lines are open to ground"
If really was with red probe to ground, then bad solders under SMC...
If really was with red probe to ground, then bad solders under SMC...