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There could be many reasons for your problem from shorting something out while the motherboard was exposed to over heating the area at the power jack. My first and simplest suggestion would be to remove, and re-seat the memory modules. Are you sure you have good solder contacts on the jack you replaced?
"move the laptop" is pretty much a dead giveaway that it's the DC Powerjack, just as you suspect. Even though it may not seem loose, its interior connection on the board is probably just enough compromised to cause the lack of power supply.
I used to solder these myself but now send them out to several different vendors on eBay without problems. Of course, your issue will be whether to spring for the 80 to 100 bucks for the jack replacement or move to a newer rig.
try to remove the battery from the computer, after unplugging it, plug in the AC adapter without the battery and check if it will turn on. if it doesnt then 2 possible reason
1. the AC adapter is busted, you can try a known good Dell AC adapter. if its still now working with a know good AC adapter then
2. its the motherboard that needs to be replaced.
Hope this help
Sounds like a bad AC adapter not charging the system. If a known good adapter has the same issue (Or this adapter works on another system) then it is a motherboard replacement
i dont know why dell did this but you have to have battery to run your laptop. the ac coard charges the battery which runs the computer. I really know why but i dont like the configuration. it is so the power is clean to your computer and so the can have less parts in the laptop you need to get a new battery
You mentioned trying a different battery, try a different AC adapter.
When plugging in the ac adapter to the wall, see if the POWER LED comes on on the adapter, then when you connect it to the computer, see if the LED stays on.
If the issue occurs with both AC adapters (No battery installed) then the motherboard has failed. If one ac adapter works but the other doesn't then the adapter is bad
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