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That is the DC - DC circuit. You will find it is the same circuitry that surrounds, where the DC Power Jack is soldered to on the motherboard; or where the DC Power Harness plugs into the motherboard.
[DC Power Jack attached to a small cable (Wires) The cable ends in a male plug connector. This now = DC Power Harness ]
This is an example of a DC to DC circuit on a laptop motherboard, and using the HP Pavilion dv6000 series, and Pavilion dv9000 series; of Notebook PC's. It also shows the main electronic components that fail; Power MOSFET's,
Here you see the Fairchild Semiconductor Industries - FDS6679 - Power MOSFET, and the Alpha & Omega LTD - AO4407 - Power MOSFET.
Looking down at the second photo, which shows the AO4407 circled in Yellow; note the small rectangular object to the immediate Right, that has a wide dark band on it.
There is one above it, one above that one at the Top; one to the right of the top one; and one to the right of it. There is also one of the same size under the AO4407, and smaller examples to the Bottom/Left of the AO4407.
These are MLCC's. Multi-Layer Ceramic Capacitor. They, like the Power MOSFET's, are SMD/SMT. Surface Mount Device/Surface Mount Technology.
Using the FDS6679, and AO4407 for examples of attainability, and price,
All this is of course, after you have checked the AC adapter (Charger), for the correct output voltage, and had an assistant gently wiggle the power cord; and cable from AC adapter TO laptop. [Fluctuation on multimeter reading, indicates a broken wire in cable]
Also after the DC Power Harness has been checked for continuity.
Of course I don't know why I am even stating this, because you are now diagnosing the DC - DC power circuit.
Direct link to ThinkPad X60 series of Notebook PC - Service Manual,
So................... 1) Am I to assume someone broke the female connector on the motherboard, that the DC Power Harness used to plug into?
Hard wired in this statement would reflect there was a DC Power Harness, soldered directly to the motherboard?
2) Or is your statement that the DC Power Jack itself, for your model; is soldered directly to the motherboard; and you hard wired the new jack in place; after cutting the plug off of the end of the new DC Power Harness? (And removing defunct DC Power Jack)
Plus; Is this an A205-s5000, or one of the A205-s5000 model series? A205-s5800, A205-s5801, A205-s5803, A205-S5843, etc.
Trying to figure out why this A205, has a DC Power Jack soldered directly to the motherboard, and is not using a DC Power Harness.
Have to make sure you are soldering to the right area, yet alone the correct contact points.
Don't know what I'm talking about? You unsoldered the DC Power Jack FROM the motherboard? Or the jack was soldered to wires, and wired to the motherboard. Hardwired. The term can be used for either scenario. That's the way it was originally?
Let's go on.
The DC Power Jack is connected to the DC to DC power circuit; on the motherboard. (Power/Charging circuit) This circuit is near where the DC Power Jack is mounted, or where the DC Power Harness plugs in.
In the circuit are Surface Mount Devices that are prone to go bad. One is the Power MOSFET's, the second are MLCC's.
(Multi-Layer Ceramic Capacitor. They, and the P.MOSFET's, are SMD/SMT Surface Mount Device/ Surface Mount Technology)
These series of Notebook PC's use the; Fairchild Semiconductor International - FDS6679 - Power MOSFET, and the, Alpha & Omega Semiconductor Limited - AO4407 - Power MOSFET.
Look at the second photo down, with the AO4407 circled in Yellow. Immediately below it, (Right corner), and immediately to the right of the AO4407; are MLCC's. Smaller rectangular object with a dark wide band in the middle of it.
There is one above the one, to the immediate right of the AO4407; one above it, one to the Right of the top one; and one to the right of it. There are also 4 smaller examples to the bottom/left corner of the AO4407.
Look to see if any are burned/blackened.
Example of availability, and cost of FDS6679, and AO4407,