Battery replacement results black screen yet there is starting noise

Thank you for your quick response. Indeed I followed the same guide. But unfortunately, it is not the case. I even assembled and de-assembled many times where each time I was trying to test a thing, without any hope. And now I removed the battery. The computer still not working even without a battery using just direct power.

Actually can the machine work without battery on direct power??

@jaykay84090 - Well… not really, I think you need some help locally, you really need to check the power rails using schematics and board drawings so you can test things.

Thank you very much mate, I will try to find someone locally. However, i have also changed the thermal paste, do you think it might caused any issued? Is it correct that the machine shutdown graphical signal to preserve cooling? In other words, should i revisit the thermal paste insulation again?

@jaykay84090 - I often encounter thermal paste issues, many people over do the quantity which then messes up the system. The issue is letting the paste spill onto the green carrier wetting the tiny SMD components on it causing them to malfunction.

So I would inspect your work. Now the tough part cleaning things off is not so simple! You need to power wash things down with isopropyl alcohol to get the paste out from around and under the SMD components.

@danj cheers! I did follow your suggestion and i did that exactly. Unfortunately the same fait. I also visited a local repare store and he told me it will take weeks to inspect it since they are busy. However, the advice that he gave me to unplug the screen connector and try it out. Which i did and sadly the issue is the same. So, should i conclude that the issue is in the main border? I mean the battery was dead, so I wouldn’t exclude the assumptions.