So, my uncle gave me this Compaq CQ1-1225 Compaq AIO Computer he told me it was working last time he used it (2 months or so) and he is not tech savvy. What I have done so far: New AC Adapter - PA-1041-71, Input 100-240V Output 12V (Powers my HP Pavilion 20XI Monitor fine and is same spec as the AIO) When I plug this in, and press the power button nothing happens, no noise, nothing. Tried unplugging it and holding power for 1 minute then plugging back in, no luck. Their is no "Battery" these units must be plugged in to work. So, Since I am tech(build my own pc's not aio's though..) I took apart the Compaq to check for any wiring problems. Found nothing that looked wrong. Removed these items one by one to test. DVD-Rom Lightscribe. No change 320GB Hard Drive. No change 2GB Ram Stick. No change I tried to jump the power button (thought maybe wiring problem there?) Nothing at all. Not one sound, or light or anything and its very frustrating as it's a good computer. Thanks! Skype: xxblueflamesxx
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
joecoolvette states that you should have19V at the input; you have a 12V psu. Check power supply requirement of your computer against actual output of your psu. Bear in mind also joecoolvette's comment about matching circuitry 16.January.2015
Here's the psu spec fromhttp://www8.hp.com/us/en/hp-search/searc... > http://h10025.www1.hp.com/ewfrf/wc/docum... : External 65W (100V - 240V) •100-127V/3A (50-60Hz) •200-240V/2A (50-60Hz) Output voltage 19V 16.January.2015
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It must be a power problem: check original psu voltage o/p is correct. (Does the psu power the computer or just the display ?)
Otherwise it's a mainboard failure.
That's my opinion; someone else may have another idea
(No beeps ?)
15.January.2015
SOURCE: Power light blinking
That is because either you screen is dead(test by connecting a exteral monitor) or you motherboard is dead and I have been seeing many dead motherboards as of late
SOURCE: HP Pavillion dv6700 - black screen
Do the following without the battery inserted.
Let the computer sit with no battery for 24 hours. Do not put the battery in at all. Try using your original memory stick ONLY, with no hard drive and see if it will POST. If it does, insert the hard drive and try again. Could be the new memory...
Another thing you can try is reseating the processor. Turn the ZIF screw, take the processor out (WATCH THE PINS!!) and put back in GENTLY. Leave the memory in the computer, hard drive removed, try to power on.
These models have been known for bad motherboards. Contact HP and arrange to send it in. If you do enough digging on HPs website, you'll find the service advisory.
-Dell & HP Certified Technician
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