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The system does sometimes go to sleep and the LCD turns off in addition to the backlight, I measure SMC_LID and its 2.66 V. That sounds low, possibly a small leak on the rail that could be causing the problem. PP3V3_S0SW_LCD_UF is 3.331 V.

Ive gone through the MacBook Air Backlight Repair lifeline that Louis posted however this problem seems to extend beyond the simpler solutions. The Backlight and LCD work fine most of the time, I get 3.34V on BKL_PWM and I found 2 resistors that were a little out of spec so I replaced them...

Thanks guys I was worried it was an SMC I will replace from a donor and give you guys an update!

This board came back in for a warranty repair, the initial problem was surge damage no power after the storm. ISL6259 was badly burned as well as R7051 and the traces to pins 16,17, and 18 of U700 had to be replaced with wires. The problem is now the system does not see a battery inside the OS...

Currently it’s 12.25 after replacing the ISL to try and get a steady green light on the charger.

These voltages remain constant whether the light is on or off: PP3V42:3.408V SMC_RESET_L: 3.37V PPBUS: 12.25V ACOK: 3.255V Is the ACOK line low enough to cause the light to trigger on / off? The only other thing I am currently looking into is to see if anything by the current sense area is...

I’ve tried 2 dc in boards for some reason when the light cuts out both PP3V42 and SMC_BC_ACOK remains steady even when the light cuts off. I will check smc reset and see if it is getting tripped and causing the light to cut off

0V on ALL_SYS. The quarter fan spin stopped after cleaning the thermal paste from around U7201 with 99% IPA. Since then there has been no fan spin and attempts to power on the board end with the green light off but PP3V42 is unchanged even though the light turns off.

We can mark this one resolved!

No Title Thanks Duke! I think I might have found something a little screwy, I will replace these components and check back in hopefully with an all fixed!

PPDCIN: 16.3V PPBUS_G3H: 12.55V PP3v42_G3H: 3.40v PP3v3_S5: 3.409v PP5v_S5: 5.027v No S0/S3 rails

Looking at a board that started out with quarter fan spin, I noticed that there was a glob of smeared thermal paste by U7201, I cleaned that and found that the thermal paste was now bridging most of the pads on one side of the QFN. I removed U7201 with the plan of cleaning the under area and...

It does PRAM reset, chimes, SMC resets, no image on external display either, when I use a USB bootable ASD drive the drive lights flash as it tries to initiate and then loops the same flash cycle over and over.

OHH (face palm) that makes sense the low resistance gives the symptoms of a short. Wont make that mistake again! It does beep once repeatedly with no RAM installed.

No signs or water damage, the back story we were told was that it went through a power surge and then wouldn't turn on again. Gets all power rails except PPVCORE_S0_CPU is only 0.86 instead of the 1.25V noted in the schematic. After noticing this I found that the capacitors on the PPVCORE rail...

Dang is it most likely an unrepairable board issue, is there anyway to extend the life of the board or is it game over?

No Title The traditional kernel panics and freezing that seems like the capacitor fix however it’s got terrible graphics anomalies. I attached a picture of what the particular one is doing.

I’m pretty familiar with the rarity of genuine AMD chips for the later A1286s, has anyone had any experience good or bad with trying to find the nVidia chips for the 2010 models. I’ve had a couple requests for 820-2850 board repairs that don’t exhibit the kernel panics and freezing that I tend...

Awesome! This was the first repair for a new business client I always hate the first impressions being unrepairable! This one is solved. Thanks smiba and

This is what I get for trying to remember component numbers without a schematic in front of me. It was C7376 when I replaced it with another cap the short was gone however it got hot with power running through it. I removed it completely and the computer turns on, is it ok to leave it off for good?