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I haven't replaced an inverter on this model before, but have done on a few other makes.
Generally the inverter is located on the bottom edge of the LCD screen behind the bezel.
The bezel is secured with screws on the front and or the edges of the bezel. these screws in most cases are hidden by small round plastic covers, they need to be carefully peeled off to reveal the screws. Also the bezel is held in place with plastic clips and double sided tape. Slip a thin metal strip between the screen and the bezel and carefully pop the bezel off, start at the bottom edge and work along each edge to release the bezel. Be careful not to scratch the LCD screen and be careful not to apply pressure to the face of the LCD screen otherwise you will crack the LCD screen.
Hi there. Remove the laptop battery and the AC power supply, open the lid as far back as you can take it. Get a small flat headed screwdriver, now, you have to take off the keyboard bezel, this is the strip of plastic above the keyboard with the power button on it, the best way to remove it is to start by the on/off button by gently prying the bezel up from the lid hinge, once you have one side out gently pull it up using your fingers, it will unclip and lift away. Next you have to remove 2 screws from the top of the keyboard, these should be visible to you, once the screws are out carefully lift the keyboard up, you will see a ribbon cable that is connected to the motherboard, gently pull the tab up on the connector that the ribbon cable sits in and it should release it and you can now remove the keyboard and replace it. To re-assemble just follow my direction in reverse. Please post back with the results and for any additional advice if needed.
I believe that the 4020 and 3620 have the same chassis. See if this helps
To the left of the battery there is an I/O cover with 2 screws, then the heat sink cover has 2 screws. There you should see the Thermal Unit (fan). It has 4 screws. Take those out and lift the unit out.
Let me know , curious to see if they are indeed the same chassis. If I could be of further assistance, let me know. If this helps or solves the issue, please rate it. Thanks, Joe
The vga board on this laptop heats up very easyly and the heatsink is uselessly small. Video may fail withing 12 months. I would recommend another laptop model, this series 3xxx and 15xx have cooling issues and parts fail often. Not much you can do about the problem.