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22265
February 4th, 2012 16:00
Latitude C840 power issue
I have an old Latitude C840 which a friend gave me. The battery tests as dead (no LEDs light up on the battery). With the battery installed and the laptop's AC adapter plugged in, it first flashes green 4 times then orange, then flashes orange 4 times and one time green, with the last sequence repeating. Without the battery, no lights at all. Should it at least power up with the AC adapter, even if the battery is not in the unit?
I left the AC adapter plugged in for about an hour with no change. The adapter has a light on it, it's on while plugged in. It's 20 v @ 4.5 A (90W)
Thanx in advance.
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ejn63
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February 22nd, 2012 11:00
It's almost certainly the system board - not the power button board.
Bay Wolf
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February 4th, 2012 16:00
The flashing lights mean the battery is bad.
You should be able to start up the notebook with the AC plugged in and without the battery.
mikeh420
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February 4th, 2012 17:00
no lights at all without the battery, also tried reseating the memory, CD, HDD
can't power up with or without battery, no power light when power button pressed
mikeh420
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February 7th, 2012 09:00
so, is this laptop not worth repairing?
ejn63
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February 7th, 2012 10:00
There is a DC power board in this model that may just need reseating (remove and reinstall) or replacing - it's relatively inexpensive so it may be worth the cost.
<ADMIN NOTE: Broken link has been removed from this post by Dell>
ejn63
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February 7th, 2012 12:00
www.parts-people.com/index.php
mikeh420
56 Posts
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February 7th, 2012 12:00
reseated the DC power board, still nothing
where can I find a DC power board and about how much is it?
Thanx
mikeh420
56 Posts
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February 16th, 2012 12:00
just replaced the DC power board, still no go
could it be something other than the motherboard?
mikeh420
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February 16th, 2012 12:00
it's does the same thing with the flashing orange and green lights, could the replacement board be bad as well?
mikeh420
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February 22nd, 2012 10:00
could it be the power button board, or do I need a new m-board?
T.I.A.
ejn63
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February 22nd, 2012 11:00
They're not very expensive.
www.parts-people.com/index.php
mikeh420
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February 22nd, 2012 11:00
thanx again ejn63, might be worth it if I can find a reasonably priced m/b
mikeh420
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March 19th, 2012 16:00
just got a new m/b today, for only $17.99, works now, but HDD not working and has some green deposits on it like it was wet, same with CD
thanx again ejn63!