820-3476-A Short to ground around PP3V42_G3H.

[VirtualLife]

I have a 820-3476-A that has short to ground. Here is a picture explained where the short begins around PP3V42_G3H.

 

[dukefawks]

Inject low voltage 1-2V on 3V42 bus with external power supply and see what component heats up.

 

[VirtualLife]

Thanks duke! To what component i inject it and what about Amps?

 

[VirtualLife]

Never mind. I checked Rossmans Video on youtube. It started working and chimed after i got the short out. I could not find the short but it just started working after the short went away. Anyways after i connected the connectors to logic board it still was working fine until i plugged the battery. It chargers but docent start anymore... What should i check now?

 

[VirtualLife]

Sometimes the fan starts to spin and sometimes it dosen't. And also the green light goes off when i move it little bit. Its not the charger because its new one.

 

[larossmann]

Perhaps corrosion you can't see on pin 8 of U1950?

More history needed!

 

[VirtualLife]

This logic board was water damaged. And yes pin 8 of U1950 has corrosion...

 

[VirtualLife]

I replaced the U1950 with a new one. Cleaned the area before soldering the new one. Now the device works just fine without any problems. I have question that how did you know that there could be corrosion? And thanks louis!

 

[dukefawks]

Because all this shit has the same corrosion on the same points. I can also tell you that there is a very good chance the short on 3V42 will return.....

 

[VirtualLife]

Thanks! Well then i have to find where the short was. I couldn't find it after it went away...

 

[larossmann]

because when you spend 3 hours looking for it and find it you never forget. https://www.youtube.com/watch?v=-ON2dWlYUQA

Sunny's catchphrase is "just jump it", but you shouldn't jump it.. but I jumped it for him, cause he couldn't wait

 

[VirtualLife]

dukefawks The short came back as you said. Can you tell me what i can do now?