-
For $29/mo, we provide access to advanced level technicians who will answer your questions on any Macbook board related matter to the best of their knowledge promptly & walk you through how to solve your problem so you can deliver a working board to your customer.Subscribe Now
820-3115 no PPVCORE_S0_CPU
- Thread starter Bouba148
- Start date
Bouba148
New member
Hi Jadao, thanks for replying
I've checked check R7402 / R7403 both are ok but I've replaced R7412 because this one wasn't in good shape and it's resistance was more than 5 MOhms.....
I've also reflowed all the U7400 area, but it's still at the same point.
I'll pass it in the UC and get back to you guys, in the mean time if you have any suggestions, they're welcome.....
I'm still waiting someone to confirm me to replace or not Q7510, Q7520, Q7550 and U7400.
I've checked check R7402 / R7403 both are ok but I've replaced R7412 because this one wasn't in good shape and it's resistance was more than 5 MOhms.....
I've also reflowed all the U7400 area, but it's still at the same point.
I'll pass it in the UC and get back to you guys, in the mean time if you have any suggestions, they're welcome.....
I'm still waiting someone to confirm me to replace or not Q7510, Q7520, Q7550 and U7400.
Ceck first if U7400 is correctly powered up, pins 19, 29, 46.
It also needs 3V at pin 47.
At pins 1 & 48 you should see some drop pulse at least, if U7400 tries to start.
Do you get SYSCLK_CLK25M_SB (25MHz) from U2600?
Also check all resistors and traces around SPI chip U6100.
Finally, try new BIOS dump...
It also needs 3V at pin 47.
At pins 1 & 48 you should see some drop pulse at least, if U7400 tries to start.
Do you get SYSCLK_CLK25M_SB (25MHz) from U2600?
Also check all resistors and traces around SPI chip U6100.
Finally, try new BIOS dump...
Try one DDR3-10600 module at a time only...
Did you try new BIOS?
Any USB activity?
Normally VCORE should follow the sequence 1.1-0.95-0.85V...
AXG should appear with apox 1V and drops to 0V in few seconds.
Possibly bad CPU if gets very hot so fast.
Normally VCORE should follow the sequence 1.1-0.95-0.85V...
AXG should appear with apox 1V and drops to 0V in few seconds.
Possibly bad CPU if gets very hot so fast.
If VCORE doesn't drop to 0.8V aprox in 2-3s, then board is not working.
Apart of mouse light, can you see flashing light for an USB OSX pendrive?
AXG should appear just in the first seconds when board is powered and disappears completely in 3-4s.
Apart of mouse light, can you see flashing light for an USB OSX pendrive?
AXG should appear just in the first seconds when board is powered and disappears completely in 3-4s.