Recent content by LCDR2

Hello I have a macbook air U7100 is hot, drawing a total of 39ma. I have replaced U7100, what would be a good next step for troubleshooting? PP5V1 CHGR VDD 5v PP5V1 CHGR VDDP 5v CHGR DCIN 17.9v CHGR_BGATE 1.2v CHGR_UGATE 8.77v CHGR VCOMP R .78v PPDCIN G3H CHGR 17.85v ____ F7140 Pin1 8v...

Hello Board looks to be in good condition. Customer described as having trouble starting machine this week, now doesn't start at all. What we get... =PPBUS_G3H 12.5v =PP3V42 G3H REG 3.42v =PP3V3_S5_REG 3.3v =PP5V S4 0v =PP5V_S3 0v =P5VS4_EN 0v = PM SLP S5 L 0v = S5 PwrGd 3.3v =...

smc lid 3.5v

Hello No caps lock or other signs of working. I did get it to display the apple folder icon once but not seen that again. Installed a known good test SSD which gets very hot.

Friends First, Computers Later.

Hello Macbook Air - replaced screen and tested backlight works OK When I power on after disconnecting battery the "Bong" sound goes repeatedly, untill I restart once, then it will "turn on" normally but with no display. Nothing on the display best I can tell, even with torch in the background...

Sorry, I don't do that many board repairs. Maybe 20 a year. I have tried SMC in bypass mode with no change. i.e. I still get the power pulse and no fan spin. I will give up on this board for now. Thank you for the help.

Hello Thank you for your help so far but I am not understanding. What do you mean by SMC mode? Do You want me to check the coils again in that mode? How do I Trigger SMC_ONOFF_L ? Kind regards James

Hello In SMC bypass mode the board does the 3 second thing. (Just checking, hold down power, plug in magsafe, hold power button for 10 seconds, release) Fan immediately spins but ony for a second. I'm not 100% sure what you mena by " all big coils; especially PCH/CPU. " but this is what I've...

I get 0v on PLT_RESET_L

So to clarify With no battery connected, computer will try to boot, drawing about .185a then restart approx every 3 seconds. the fan does not move.

Hello No power supply connected with Diode Mode. "With no battery connected no boot / fan spin." - With no battery connected, the laptop does not do quarter fan spin, or boot in any way. Computer was "fine" before customer brought it in.

Voltages SCL - 2.9 - 3.4 (fluctuates) SDA - ditto with battery and PSU connected. SCL 0.477 SDA - 0.457

"PPBUS G3H 8.57 with no battery, 8.38 with battery 3 V3_SUS 3.29v with and without battery is battery bus U7100 ?

Hi Quarter fan spin when battery connected. With no battery connected no boot / fan spin. PPBUS G3H 8.2v PP3V42 G3H 3.4 PP5V S5 5v PP3V3 3.3v I replaced capacitors C1992 and C1902 as they looked damanged Thanks in advance. James