Mnual or schematic please

Suggestions;

Anti-Static wrist strap connected to ground source, and your wrist;

1) The jack your AC adapter plugs into on the motherboard, is the DC Power Jack.
Motherboard out of case, power to motherboard, take your multimeter and see if you are getting 19 VDC at the DC Power Jack's positive solder joint, on motherboard.

The center pin of the jack is Positive. (The inner cylindrical shell is Negative)
Follow the DC Power Jack's positive pin from the Center of the jack, to the motherboard.

You probably won't be able to touch your meter's Positive (Red) probe, to the DC Power Jack's positive pin under the jack; so touch it's solder joint on the opposite side of the motherboard.
(DC Power Jack should be soldered close to the motherboard, is why)

Of course also touch the Negative lead, (Black probe), of your meter, to the Negative, (Ground) solder joint for the DC Power Jack.

Getting 19 volts DC?

See if there is a cracked solder joint, for any of the DC Power Jack's pin connections to the motherboard.
ANY perceptible movement of the DC Power Jack on the motherboard, indicates a bad power jack, and may indicate a broken/cracked solder joint.
Center pin of DC Power Jack is loose? Bad DC Power Jack. Replace.

2) DC Power Jack is determined to be in good repair? No cracked/broken solder joints?
The next components in the power circuit on the motherboard, leading From the power jack, are P. MOSFET's.
Power MOSFET.

Power MOSFET Wikipedia the free encyclopedia

More information using a prior solution,

Dv6000 power light does not come on any more

Check the links given.

3) The last thing that concerns me, although I probably should have listed it first; is the AC adapter you are using.
Concern is that it doesn't have the 'intelligent chipset' that matches the Compaq CQ1-1225 All-In-One desktop PC's circuitry.

AC Adapter For Compaq Presario All in One CQ1 1225 Desktop PC Charger...


Just my thoughts..........
Regards,
joecoolvette

without schem measure the AC ripple on the DC line and see if it is unreasonable. If so start replacing filter caps. measure AC before and after - if change is large the cap is probably ok.

There is a stripdown here
https://www.youtube.com/watch?v=kTZHOra4Whw
If it doesn't show what you need perhaps you could contact the guy direct through his contact details/site

please measure the output for your charger,normally they have 19.5 vdc exactly, if they do not measure the adapter is faulty, repair or replace.If the output is o.k the battery can be faulty. Use the software diagnostic coming with the computer, restart the computer HOLD the key f2 or esc depending of your computer model, and make the diagnostic.try again and see what is the result, if the battery is o.k or faulty.God bless you

If this motherboard is a multi-layer motherboard then it is impossible to repair.
You can try to repair the motherboard by glueing the broken piece onto the motherboard with epoxy glue. Then identify the broken power circuit tracks between both parts of the circuit board, and then solder wires across these tracks or to the closest solder connections to re-establish the electrical connections on the motherboard.
If this does not fix the problem then most likely it is a multi-layer motherboard and you cannot bridge the internal connection inside the motherboard.

You have a bad DC jack. It was either broken from the motherboard, or the solder melted from overheating. Have a local technician fix the DC jack for you and you will be fine. Standard price for a DC jack repair should be no more than $80.
Good luck!

Not sure about schematics but here are a couple links to disassembly guides:
<http://www.applefritter.com/Mac_Mini_Take_Apart_Guide>
<http://www.r3uk.com/index.php/tech-tips/34-disassembly-guides/4-apple-mac-mini-model-a1170-disassembly-guide>
Also,
Check this site out <http://www.123macmini.com/news/story/316.html>
Good luck.
K.

Test your microphone if it properly working. Go to Sounds and Audio Devices properties and then go to Voice Tab and then Test Hardware. If the computer does'nt hear anything then your mic is faulty.

replace the motherboard please.