4 
1 Liquid damage, No short on Motherboard only chimes nothing else
Hello community,
I am into electronics for approximately 4 years and I already repaired a lot of things. A lot of boards of monitors, tvs and even laptops. So my cousin contacted me, after he spilled cola onto his macbook.
He tried to dry it. Now the macbook tries to startup. A chime sound is played, but nothing happens afterwards. No image on the screen. I controlled if the backlight is not working, but there is no image whatsoever. I tried to plug it onto my monitor. No image also. No backlight of the keyboard. Capslock light not working also. So the laptop is dead.
I opened up the board and inspected it with my multimeter. I found no shorts on the board. Trackpad is also clear and no shorts.
I connected it to the power and tried to measure some Voltages.
There a 3 Coils and I measured everyone of them.
I have a 5V on one Coil. (LC320)
12V on another coil. But only in the small bootup sequence with the chime. (L5230)
But the last one has no voltages at all. (LP800)
The part numbers with (XXX) I have from the BoardView I found on the internet. I can upload the bord schematic too if needed.
So I don't know whats wrong. Unfortunately I can't find any similar problems on other threads. Any ideas?
Thanks in advance
crwdns2934109:0crwdne2934109:0
crwdns2944067:028crwdne2944067:0
Sorry I don't have the schematics or boardview drawings for this system so you're one step ahead of me ;-}
I would spend some time over on Louis Rossmann's YouTube Channel - Reviewing these vids
crwdns2934271:0crwdnd2934271:0 Dan crwdne2934271:0
I will do in the next days. I know Louis already, but there are no videos for the A2338 model.
crwdns2934271:0crwdnd2934271:0 Selim Karakurt crwdne2934271:0
@harak whats the board number 820-
crwdns2934271:0crwdnd2934271:0 daniel crwdne2934271:0
@harak - OK, I see the issue here we are not dealing with the Intel system you have the newer M1/M2 system! Thats what the A2338 is!
I've fixed the model info for you.
Sadly, you won't find the schematics for this series yet! As they haven't fallen off the back of the truck ;-{
crwdns2934271:0crwdnd2934271:0 Dan crwdne2934271:0
@danj one guy in the internet made a schematic on his own. I am at work now and will upload it at home. And yes the modell number is A2338.
crwdns2934271:0crwdnd2934271:0 Selim Karakurt crwdne2934271:0
crwdns2934275:023crwdne2934275:0