1) Check the AC adapter (Charger) to see if it is putting out 20 Volts DC.
Use a multimeter with the Function knob set to DC Voltage. If just a symbol, the symbol is a dotted line over a solid line.
If there is a multiple setting for the Function knob with DC Voltage, set it to the 0 to 50 Volt (DC) scale.
If you do not have one, or access to one, an economical yet reliable multimeter, can be purchased for as little as $10. (Less in some places)
A multitude of stores carry them. An auto parts store is but one example.
Analog or digital doesn't matter.http://www.laptoppartsnow.com/uhsdfsrzdgir779.html
This is the DC Power Jack. May be labeled as DC IN on the laptop,http://www.discountelectronics.com/index.php?l=product_detail&p=14640
I want to show you it, and have you look at the cable end, that is coming from the AC adapter (Charger) TO the laptop.
(To the DC Power Jack)
See the 3 pins? Arranged in a triangle? Note the socket holes in the cable end.
The pin that sits all by itself on Top, is the Positive pin.
The two pins down below are Negative, or Ground, pins.
The Positive (Red) probe lead of the multimeter, is inserted into the single socket hole, in the cable end.
The Negative (Black) probe lead can go into any of the two bottom socket holes.
Read very near 20 Volts?
Have an assistant wiggle both cables. First the one from the charger To the laptop, then the one from the charger to the wall receptacle. (Or surge protector, actually)
2) Charger checks out?
Go to the DC Power Jack.
You may wish to skip checking the charger out first, and check the DC Power Jack, if you Know that the charger is good.
Battery removed see if you can wiggle one of those 3 pins around.
Be gentle, use a pencil if available.
ANY perceptible movement means a Problem.
Looking back at the second link above showing the DC Power Jack, note the metal prongs coming down towards the bottom of the jack.
There are 4.
2 on each side.
Note the 3 long pins sticking down towards the back of the jack.
The 4 outside prongs made from the outer case, are used to anchor the jack into place. They go down through holes in the motherboard, and are soldered on the opposite side.
There may be Ground attached to the case through these prongs also.
The two pins sticking down towards the Back of the jack, are also Ground pins. (Negative)
The single pin by itself is Positive.
A) IF, any of the pins wiggle, the jack is broken, and needs to be replaced.
B) IF, the outer shell of the jack wiggles, the jack May just need to be soldered back into place.
(Could also be an indication of more damage than appears to the eye)
Same thing for the single Positive pin solder joint.
Charger checks out, DC Power Jack checks out, the problem may be a bad power sensor chipset.
This chipset senses when the laptop battery needs a full charge, or a trickle charge, or no charge.
This means it also will sense when the laptop is to be run straight off of the charger, and not the battery.
Usually means motherboard replacement, unless you have access to the chip, and means to replace it. (Soldering tools, and technique)
Appreciate it if you would keep me apprised as to what you find.
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