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Ok will try this. It seem some bouncing in 10sec it goes down to.999v but not lower than that Ok so hardware mod is a bios disable gpu for 2010

I tried several test ram and nothing same issue. That’s the thing it’s steady 1.05v And I usually see it Go from 1.05 - .825V on a working board. I’ve checked all my u7801 for enables and I have 1.05v.

Hi I have 4 820-2850 that had 1/4 fan spin I’ve done some work on and 1 actually booted and died after with 3 beeps the other 2 820-2850’s start to boot but hang 1.04v on cpuvcore. My magesafe power supply says it starts drawing 1.23amps and when fans spins high it draws 1.43amps from MagSafe...

Oh I’m using a bga stencil Or what I think is a bga stencil that just lines up. I will look for the Correct stencil and right down the size or just use solder paste :) thanks

Also I saw you posted a bios For 820-2915 with gpu disabled. Will that survive a nvram ?

Ok both boards measurements are equal in diode mode and ohms. Let’s say I was gonna attempt a pch swap what size solder balls would I use ?

I tested again and I replaced L9080 same thing 0v 17/18 on bad board 1.14V on 17/18 good board.

Oh ok on my working board I have 1.14v 17/18 that’s the only thing missing on the non working :(

Ok I Have PPVCORE_S0_AXG=0V it never comes up. I waited like a hour took the reading in front of filter on 17/18 on test point before it goes to the other side of the board all test between 95- 98 ohms higher values the further from the connector. This ddc/data line has been bothering me since...

Yes I’ve done this it still does the same :/ with nothing connected just magesafe and also with just the battery.

Ok thanks will do :)

Ok I finally got back to this board. I don’t have ultrasonic :( I didn’t heaT anything as of yet. i replaced c8074, c8080 and some other parts. I’ve enclosed a image of the area they didn’t look quite right Cracks and loose. I plugged it in and fans spin normally I powered it down and connect...

Ok I’ll checked it again. but my working board also had 95ohms. When I connect the screen :/ I powered it up the screen works and powered it down removed from power and test 17/18 it’s still 95ohms. I understand 2/3, 21/21 pins are connected but I just check it and post The values separately...

——--Diode. Voltage Pin 2 .462. 3.3v Pin 3 .462. 3.3v Pin 4 .333. 3.28v Pin 6 .525. 3.28v Pin 7 .561. 3.28v Pin 17 .363. 0v Pin 18 .351 0v Pin 21 .570. 26.98v Pin 22 .570. 26.98v Pin 22 .570...

ok I fixed the dead board and this screen does indeed work. So what can it be ? Bad PCH ? LVDS connector? Maybe I should Have startEd with what I worked on. Maybe I messed something up I repaired u6100, u7760, u7780, Q3380, f9700. I got these for $5 each so they where missing parts and or...

Ok I’ll first try with just the Lvds cable with no screen connected. I will try the screen on another dead board for measurement sake if I get 95ohms then I know for sure it’s the assembly. I’m thinking more like it’s the lvds connector :/

Ok I replaced it L9080 will try another lcd assembly could it also be the lvds?

I’m not sure of what you’re saying. I have backlight the screen is dim. Apple logo on back of screen is glowing but no image or Apple/ flashing folder. You asked me to check LVDS_DDC_CLK/DATA I checked and it had 0v. I thought I was having no image J9000 pins 24-29 LED_RETURN_1 =.681v...

Resolved damaged trace and pad under choke :/

J9000 pins 1- gnd 2-.582 3-.582 4-.339 5-OL 6-.610 7-.560 8-.600 9-.627 10-gnd 11-gnd 12-.628 13-.gnd 14-gnd 15-.605 16-.gnd 17-gnd 18-.606 19-.gnd 20-gnd 21-.577 22-.577 23-.577 24-.615 25-.615 26-.585 27-.585 28-.585 29-.585 30-OL LCD unplugged voltages Pins 2& 3 0v Pins 6&7 0v Pins 17&18...