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Search: Posts Made By: marce002
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 11-09-2021, 06:45 AM
Replies: 6
Views: 273
Posted By marce002
Re: Macbook A1466 820 3437 no chime CPU hot

thanks paulyboy i will return this a1466 with no solution i think,

An identical 820 3437 board shows 69.7ohm in the CPU coils (both) and this one at identical conditions shows 129ohms both... bad...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 11-08-2021, 02:12 PM
Replies: 6
Views: 273
Posted By marce002
Re: Macbook A1466 820 3437 no chime CPU hot

PLT_RESET_L is present
no water damage
SPI ROM not reflashed yet but i wanted to make sure CPU is not toasted
USB is 5v present,

CPU Hot!, untouchable after 2 mins on, (with heatsink)
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 11-02-2021, 07:51 PM
Replies: 6
Views: 273
Posted By marce002
Re: Macbook A1466 820 3437 no chime CPU hot

vcore is present both, 1,72v
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 11-02-2021, 01:03 PM
Replies: 6
Views: 273
Posted By marce002
Macbook A1466 820 3437 no chime CPU hot

Hello

Just want to diagnose bad cpu and trash this away, but hope will not

No water damage, no signs of corrosion, magsafe green then amber (no battery attached though), fan spin fast, and CPU...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-13-2021, 11:51 AM
Replies: 11
Views: 551
Posted By marce002
Re: Macbook A1286 not charging no power from bat BUT WORKS ON AC

ok updated status is: Replaced big Resistor R6995 1004 in the 3.42v generation zone, wich despite its value reading with MM was ok, it did the trick, and now overnight or "cold"/warm issue is gone...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-10-2021, 07:21 PM
Replies: 2
Views: 153
Posted By marce002
Re: a1297 slow cpu battery not charging but detected

Any hint to help determine if problem is battery or motherboard.mm?
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-10-2021, 02:16 PM
Replies: 2
Views: 153
Posted By marce002
a1297 slow cpu battery not charging but detected

Hello anyone can guide me to this issue, macbook a1297 5 white blinks, then starts ok, gpu still alive,
.. laptop works fine but no amber not charging but bat is detected in mac os high sierra, and...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 10-07-2021, 06:31 PM
Replies: 1
Views: 157
Posted By marce002
Test dusplay "backlight only" A1297 macbook pro 2010

Hi

I have image but no backlight. Fuse is blown. I think the display is faulty or cable lvds.. but not shorted last 3 pins in connector to GND
.. Can I test the screen backlight only unplugged...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-25-2021, 05:58 PM
Replies: 0
Views: 136
Posted By marce002
a1297 820-2914A - 18v at Vcore!!

Hello

An easy one, but just in case i ask> It is a no power mac, but saddly come with a missing mosfet Q7035 , tested vcore coils and AC volt is present at them, so 18v in the coils!! (I' ve...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-24-2021, 10:26 AM
Replies: 5
Views: 328
Posted By marce002
Re: a1286 Dead CPU ? No PPVCORE / No PP0V75_S0_DDRVTT

ok I can hear the chime... did not much ... just reheated SMC and cpu just a little... activity usb is also present.... im going to test further, who knows.... cpu is often not died.. was consuming...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-24-2021, 05:12 AM
Replies: 5
Views: 328
Posted By marce002
Re: a1286 Dead CPU ? No PPVCORE / No PP0V75_S0_DDRVTT

Ok reformatt! now PP1V5_S0 is present i cant determine why was not yesterday. Rest is the same no vcore...and no PP0V75_S0_DDRVTT I just want to understand a method to conclude a bad CPU here in...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-23-2021, 10:21 AM
Replies: 5
Views: 328
Posted By marce002
Re: a1286 Dead CPU ? No PPVCORE / No PP0V75_S0_DDRVTT

u7400 is not activating the gates, why? what can i have wrong? (need help troubleshooting u7400), of course R7402 is fine 90.9k and saw all videos related to this.. (larossmann)
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-22-2021, 06:51 PM
Replies: 5
Views: 328
Posted By marce002
Re: a1286 Dead CPU ? No PPVCORE / No PP0V75_S0_DDRVTT

forgot to mention that GPU was disabled through jumpers, so not gpu at all in this board... previous owner was using fine with no gpu
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-22-2021, 04:55 PM
Replies: 5
Views: 328
Posted By marce002
a1286 Dead CPU ? No PPVCORE / No PP0V75_S0_DDRVTT

Hi

2011 a1286 820 2915-B , no water damage.

Turns fans on with keyboard attached (but reach max rpm after minute progressively), NO CHIME, USB mouse light up, removing memory no white led...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-21-2021, 07:46 AM
Replies: 11
Views: 551
Posted By marce002
Re: Macbook A1286 not charging no power from bat BUT WORKS ON AC

yes in the coil hgave 3.38V steady but sometimes does not start, and when touching coil L6995 zone it starts, some weird behaviour is in that U6990 zone...
anyway now that is powered on it is steady...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-21-2021, 06:57 AM
Replies: 11
Views: 551
Posted By marce002
Re: Macbook A1286 not charging no power from bat BUT WORKS ON AC

Hi Mon2

1) it was not DCIN, it was battery only (since i was told above to measure with no magsafe by reformatt)

2) volt with ac and bat the same:
1- 18.11v
2- 18.11v

39kohm fuse is ok...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-20-2021, 11:56 AM
Replies: 11
Views: 551
Posted By marce002
Re: Macbook A1286 not charging no power from bat BUT WORKS ON AC

yes I have U6990 with bat volt at pin 3 BUT ALSO in pin 2?? and should be 3.42v i think... you are right seems to be NOT 3.42v in that pin 2....
clean and no corrosion zone.
volts at U6990 are...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-17-2021, 10:18 AM
Replies: 11
Views: 551
Posted By marce002
Re: Macbook A1286 not charging no power from bat BUT WORKS ON AC

thanks mon2 i will post them, but i want to add a little strange thing, which is that

in "cold overnight start" i have no power, but when I warm it up a little bit around resistor (R6995) it will...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-14-2021, 07:30 PM
Replies: 11
Views: 551
Posted By marce002
Macbook A1286 not charging no power from bat BUT WORKS ON AC

Hello

Anyone can help me out this rare issue ... macbook a1286 2010.... it is 820 2850
Works fine from ac power and disconnecting AC also works from battery no issues

But

It will not power...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-10-2021, 09:22 AM
Replies: 9
Views: 370
Posted By marce002
Re: Macbook Core i7 2010 a1286 820 - 2850A CRAZY JUMPING voltages

ok it is on!!!!! with chan sound and also image!!!!! after some debugging and heatings to the board while inspecting derived loads from PP3V3_S5.... full speed fans though an quite slow.....
...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-10-2021, 06:37 AM
Replies: 9
Views: 370
Posted By marce002
Re: Macbook Core i7 2010 a1286 820 - 2850A CRAZY JUMPING voltages

i have been lifting up coils and testing volt /mah variation in my power supply and L7260 was the cause of jumping...when that on removed (one leg) I can see steady output,,,,,, so i will put it back...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-09-2021, 06:50 PM
Replies: 9
Views: 370
Posted By marce002
Re: Macbook Core i7 2010 a1286 820 - 2850A CRAZY JUMPING voltages

Current sense resistors are ok (the 4 ones) in U7000 area, 10ohm, 0 ohm and 2.2ohm ...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-09-2021, 04:00 PM
Replies: 9
Views: 370
Posted By marce002
Re: Macbook Core i7 2010 a1286 820 - 2850A CRAZY JUMPING voltages

My question is: Given that f7040 removed is having steady 12.35v one side, but when i solder back I have a slight variation between 12.4v to 12.48, but all dependant lines have a more crazy...
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-09-2021, 03:45 PM
Replies: 9
Views: 370
Posted By marce002
Re: Macbook Core i7 2010 a1286 820 - 2850A CRAZY JUMPING voltages

sorry i forgot that one because it is under the speaker.... it is

L7260=8.77kohm
L9701=0.400Mohm
Forum: Troubleshooting Laptops, Tablets, and Mobile Devices 09-09-2021, 12:02 PM
Replies: 9
Views: 370
Posted By marce002
Re: Macbook Core i7 2010 a1286 820 - 2850A CRAZY JUMPING voltages

Just to test... removed main fuse f7040 and ppbus_g3h is stable as usual.. so not blame u7000.
Showing results 1 to 25 of 138

 
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