The DS won't turn on. Green light flashes for a second.

This usually means that a ribbon cable is disconnected. I would open up the top part of the clam shell, and Check all the ribbon cable. Use some tweezers if needed since you have big fingers. BUT! Be careful, those ribbon cables are delicate, along with the fastener clips (the black clamp where you fasten down the cable). If the cables in the top shell are properly fastened and they aren't damaged, then you might have to check the cables going from the sister board (Top shell) to the main motherboard (bottom shell). Check for damage, and check to see if its properly fastened into the both the motherboard and sister-board. Hopefully you have a Tr-wing bit (or screwdriver) to get into the bottom part of the DS.

"Removing the wifi card resulted in a positive response. Yes, the logic board will turn on. Fuses will only impact on charging the battery. I assume the L2/L4 inductors are fine because the system actually turns on.

The logic board powers and see that the wifi is installed. The next step is to power on the top and bottom lcds. If there is a disruption of power to any of the lcds, then it would cause the system to power on and immediately power off.

The issue has to do with the lcd ribbon cable (or connection). The ribbon cable can only in as much as it allows. When inserting, push in as far as it goes until the flared ends on each side of the flex cable touches the edges of the connector on the logic board. Make sure that you then lock the connector.

Over 80% of these issues are related to the top lcd. The top lcd has to be twisted around the hinge of the unit. This, over time, (assuming that the hinge is not broken and top half is loose) may cause a slight tear. Buy a replacement lcd and try connecting it to the logic board with the lower lcd. Turn it on and see if it works."

"Hey, 3 years later I'm answering to get some clue about this issue. I have the exact same problem, and I didn't get to repare it. I also disconect the Wifi module and the green led light stays... in the end, all the same sympthoms.

Have you finally repaired it? I'll keep researching for some clues."

"Another year later the same problem occurs.

It turned out that, for me, the top screen's ribbon cable was *slightly* loose. By 'slightly' I mean it was less than a milimeter from the furthest point. I suggest you reinsert all your ribbon cables."

"Finally, after investigating this problem for a whole night, I’ve managed to get the box fixed. It turned out to be a problem of both screens’ back light circuits on the main board got burned. So no flash on any of them when turned on (symptoms: green light lit after turned on, brightens for 1 second, and turned off; can charge properly).

You need to check all those LEDA1/2 LEDC1/2 connections on the main board all the way to the screen connectors.

Refer to the following pictures. Make sure every color coded pins are connected to each other. If not, connect them with a cable from the pin next to the screen connector to the corresponding capacitor above start button.

Something like this works for me!"

OK. I have the exactly same problem. The thing is, I swapped both screen with another machine and all 4 are working fine. When the green light is on for the second, no screen flashes. Wifi module removed will make it stay green, but light green. Anyone ever got it fixed?