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L7130 - 0.131 L7095 - 0.000 Tested Red to ground and on both sides of chip. Does that Mean I have a short on PP3v42? u7090 1 - 0.6V 2 - 335mv 3 - 1.6444v 4 - 0.542v 5 - - 6 - 17.52v 7 - - 8 - 17.54v 9 - -

Could U7090 be a problem? I went down the rabbit hole of U7100. The hot spot is about 38 degree..

Hi All This is what I know. PPBUS_G3H - 0v PP3V42_G3H -0v CHGR_UGATE 4mv CHGR_LGATE - 0mv U7100 1 -.39mv 2 18.16v 3 4.82v 4 330mv 5 0.4mv 6 0v 7 0.4mv 8 0.3mv 9 33.1mv 10 330mv 11 330mv 12 332mv 13 13.4mv 14 330mv 15 11.5mv 16 0v 17 7mv 18 7mv 19 5v 20 5v 12 0v 22 0v 23 7mv 24 7mv 25 4.77mv...

Ok another update. I was looking over the board again. I found R7612 looked a little off. A bit of corrosion and damage. I checked voltages on each side as I did board restarted and then restarted with 500ma draw This seems to control REFIN of u7600. Not sure what REFIN does. Given the...

So unplugged and reconnected battery and charger. Fan now spinning at 100% but drawing 235ma. these random board issues are the most frustrating.

OK I checked all the inputs for U7870 and PP1V5 S0 appeared so maybe never mind. No change in laptop behavior. maybe a misread.

Not reflowed SMC yet. I've been working my way through power rails I have PP1V05 SUS 1.05v I no NOT have PP1V5 S0 (Zero Volts) Is this consistent with SMC issue / PLT Reset issue or is this an upstream problem? Kind regards, James

PLT_RESET_L - 0v Will reflow SMC

HI All, Macbook air Sometimes boots normally and functions 100%. Other times, fan will spin, with no video or chime. Board looks good with no obvious signs of corrosion. Not a backlight issue. Will sometimes chime and boot normally. When it does not chime there is no video / backlight...

HI, Thanks for the info. Red to ground! 0.466 on both SCL and SDA.

Macbook is OK booting and will stay on for hours. Shuts down (seems to completely just power off) when doing something intensive like HD youtube. Have not managed to "catch" it yet. I have tried with a different battery which made no difference.

Power and battery both disconnected before I changed mode. Red on the Component End, Black on Ground... I will have another go tomorrow.

As far as I know the screen works. LCD_BKLT_EN 3.5v SCL - 4.5 - 3.2v pulsing around ?? BKLT_SDA - 4.5 - 3.2v pulsing around ?? I may be doing it wrong but I get a value of 0 for diode mode to ground on both SCL and SDA

HI All PPVOUT_S0_LCDBKLT - 1.3mv PPBUS_S0_LCDBKLT_FUSED - 12.86v LCDBKLT_EN_L - 12.72v PPBUS_SW_LCDBKLT_PWR - 12.87v PPBUS_SW_BKL - 12.6mv Is my Q7706 bad or should LCDBKLT_EN_L be a low / 0 voltage? Cheers, James

Hi Did u8900 and replaced battery. All happy now. Cheers.

PP5V_S0 5v BKL_FSET 3.3v PP3v3_S0 - pulses 0 - 1.2v

PPVout is 2.23v

Sorry about the delay, I have been in hospital getting my appendix removed! All good now :) F9700 has voltage on both sides. 8.4v (no battery or screen connected) Q9706 P1,2,5,6 - 1.84v P3 8.07v P4 8.37v

Computer appears to start, then trips out. Bench PSU shows draw from .25ma to approx 1amp after 1 second. which then resets and starts again. Client says it sometimes turns on normally. Some kind of over voltage protection or a shorted component tripping a circuit? Not sure where to start...

Hi Sorry for the long delay. I have been in hospital having my appendix removed. I replaced U7600, however before i had time to properly check all the output pins etc I must have shorted something because I smelt the bad smoke and now the laptop won't turn on. Looks like it's back to the...