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I changed the battery now. 1. The DMM shows 1.6v on both L7510/20 on all 4 pins. 2. No voltage drop from 1.15V to 0.75-0.8V on L7510/20 3. Still NO chime. Whats next? 4. I checked J9000 connector/LVDS ppv3v3_LCDVDD_SW_F on pin: 2 & 3 (Suppose to be 3.3v). I get NO reading!

Ok i get it: /20 means. 1. L7510 and L7520. Sorry. i get it now.

No Title There are only 2 pins on L7510..??

1. Ok, wont mention voltage divider. 2. L7510/20. I cant find it on the schematics or boardview. Do i search correct like this: L7510/20. Shouldnt it not be only L7510 i search..? 3. the extension: /20.. What does that mean?

Its correct now on: 1. Q7510 is 1.8v on output pins: 6,7,8. 2. Q7510 VIN is 12v. 3. L7510 is 1.8v on both input and output pins. No voltage drop from 1.15V to 0.75-0.8V on L7510..

I check louis video https://www.youtube.com/watch?v=WHx1mzlwGpY Same spot he showed, the Vcore i get 0.2v.

No Title 1. Tried pram reset,not working, No chime, only the sound from the fan spinning 2. The bord and fan spins but No image, i tried with another screen not working aswell 3. Q7510 (voltage divider) i also get 3v on the output on all 4 pins

Thanks for the excellent advice. 1. USB port is working fine with USB (LED is blinking). 2. L7510 i get 3.3v on both sides of the coil. What now?

im still learning.. ´Check for USB activity´ how I do that? What voltages do we expect to have there?

Hi, i have a customer computer who spilled juice on the keyboard. Some small areas have been cleaned on motherboard with isopropanol. 1. I have green light and FAN spin on motherboard. 2. NO CHIME 3. NO IMAGE Any suggestions? thanks

Ok, thank you..

Thank you so much.. It really worked.. I changed the LIO Board and direct the CHIME and AUDIO was working again. Million thanks.. :)

Hey everyone. have a problem with Macbook Air 820-3437 1. No chime 2. Audio icon showing Computer works fine otherwise. Any suggestions? thank you

It turned out to be solved the problem.. Fans are now Ok.. I believe the SMC reset did the job. I took out the battery and hold down the start button for a few seconds. Plugged in the battery and, booted the computer, it then rebooted and wips the computer was working normal again.

I changed the keyboard chassi on a customer Macbook Air. Now after that change the FAN spins high.. I have tried to reset the SMC, PRAM, NVRAM without any success. What could be the problem?

I was thinking the same.. Ok.. will be back shortly.. hang on thx

No image and no backlight. Computer works fine with external monitor and boot as usual. - On U8300 Pin 2 & 3 in Diode mode i get low reading 0.018 on both pins. (on another board I get 0.350 on both pins 1 & 2) - On U8300 in voltage mode on pin 2 & 3 i get 0 Volt. Could the bad guy be U8300..?

I have checked J8300 Pin 18 & 19. and get No 3.3v... Where should I start now to trace back and troubleshoot to find the problem for lcd backlight? thx

The voltage on C9010 shows 27v.. I have NO FAN spin now as well. Its gone. So where should I check first. Guess I need to trace everything back.. But where to start is FAN doesnt turn on? PPBUS_G3H..??