Question about HP Computers & Internet
Light beside the dc jack on motherboard is ok... the power board was changed. and always no power up. I always try another CPU Thanks for help
A) Using another Processor won't do squat. (CPU)
B) Power Board was changed? OK, fine.
All it is though, is a -> POWER ON SWITCH.
Not a power circuit board.
HP part number - HP605794-001
C) Power LED is on, on laptop?
(Light beside DC Power Jack)
Does the AC adapter (Charger) put out 18.5 Volts DC?
Did you have an assistant wiggle the power cord, and cable from AC adapter TO laptop; to see if there is a break in the wires?
Is the DC Power Jack in good repair?
Center Pin does not move? Jack seems to be solidly soldered to motherboard?
[Battery also removed when checking condition of DC Power Jack ]
All checks out OK?
Suggest one, or both of your Power MOSFET's is bad.
Suggest one is shorted out.
Or one is Open.
The power circuit section of the motherboard, (DC - DC ), is close to the DC Power Jack,
The above is BOTTOM view of the motherboard. The white rectangular shape with the multiple holes in it, is the Processor socket.
To the right is the LEFT side of the motherboard.
The silvery port at the Top is the VGA port.
Below it is the DC Power Jack.
[Then Ethernet port, HDMI port, and USB port ]
Use -> Mouse here to Zoom in <- option.
See the black rectangular object marked TS21C?
(HF / 1023H)
That is a 10/100 Base-T Ethernet Isolation Transformer, made by Taiwan Semiconductor.
Look way above it at C521, C524, and C523.
Those are MLCC's.
Multi-Layer Ceramic Capacitor. (And Surface Mount Device. SMD)
Now look to the top right of them, at the rectangular black chipset, that has 8 'legs'. Looks like a bug. There are 4 legs on each side.
(Those 'legs' are J-leads)
THAT, is a Power MOSFET.
There is a smaller one to the immediate left of it.
(They are right below 2R2 024 M1J )
Now read this article about P.MOSFET's used on the HP Pavilion dv6000 series, and Pavilion dv9000 series of Notebook PC's,
In this application, and with the two P.MOSFET's used; the Alpha & Omega - AO4407 - Power MOSFET, if shorted out will Not let the power circuit turn on.
"IF the AO4407 is shorted - The unit will not come on"
Also if the Fairchild Semiconductor - FDS6679 - Power MOSFET is OPEN; the unit will not come on.
Do Not know what P.MOSFET manufacturer, or value/s are used, on your HP Compaq 625 Notebook PC.
Example of purchasing an FDS6679, and AO4407,
Phased out. Cross-reference examples are shown.
Using DMP3020LSS-13 as an example,
78 cents USD.
Also check all of the MLCC's.
Examples of MLCC's that are SMD, and 4.7uf (MicroFarad) capacitance, and 16 Volts DC; values,
NOT stating they are the correct values for some of the ones, on the laptop's motherboard. JUST examples.
Service Manual (Free) from HP Support,
Hope you are using an ESD wrist strap, and have it's alligator clip attached to a good ground source.
Otherwise get ready to use your motherboard for a Frisbee.
For additional questions please post in a Comment.
Posted on Dec 10, 2012
Test your PSU power supply unit or replace it if your power supply units fan is not working your PSU is faulty http://pcsupport.about.com/od/toolsofthetrade/f/powersupplytest.htm WARNING: Before you start troubleshooting remember that you are dealing with electricity that can KILL. http://www.kitchentablecomputers.com/static.php - rules
Test all power and data leads that attach to your hard drive IDE,SATA
The leads from your MOTHERBOARD TO YOUR HARD DRIVE make sure they have secure dust free connections and are not faulty. Any bad or faulty power or data lead or connection can cause a computer not boot up.
Motherboard and a Hard Drive any leads between them will fail before your motherboard or your hard drive if its a flat ribbon 40 pin type IDE replace it this will be the first to fail. Make sure your graphics card is securely seated with no dust built up or in the socket if you remove your graphics check the socket to make sure its dust free restart your computer then reinstall it this should activate found new hardware wizard Make sure all leads that are attached to your drives dvd\cd floppy have secure dust free connections and are not faulty or just replace them they could be faulty a computer needs Power and Data to travel through every working device and to continue its cycle and have an end so any faulty leads will end up with a computer error even something as small as a faulty power lead or fan lead can cause you problems computers need all of the data and electrical current to travel through every working device and to have an end to be able work properly Make sure ram modules and cmos batteries have dust free secure seatings and cmos battery has charge some motherboards cmos batteries are soldered in Check you CPU make sure its securely seated and has thermal grease http://www.hardwaresecrets.com/article/Thermal-Compound-Roundup-February-2012/1490 Hope this helps.
Posted on Dec 10, 2012
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Posted on Jan 02, 2017
SOURCE: not booting
check ur mother board power supply check the FET check all the power lines from the smpswith respective of ground with any line short check which component is primerly conected to that line replace it check the FET power IC etc
Posted on Nov 29, 2007
SOURCE: Mother Board Gateway MX6958
In order to help you I will need you to take the laptop completley apart and get the model number off the bottom of the motherboard. it will say either intel than numbers and letter or asus than numbers or letters. but we need the model number of your motherboard so we can get you the part number. Or can you give me the serial number off the bottom of the laptop and i can try to look up your information that way and get you the information you need to get the board.
Posted on Jan 06, 2009
The light is probably the power light which is ok, but from past experience it sounds like the board is dead for one reason or other. Is it still under warranty? If it is take it back to where you got it, with the purchase docket if you have it and talk to them about what you have tested and ask for a replacement. If it is out of warranty, try ebay or use www.staticice.com.au to search for the same motherboard if you want to rebuild the system without having to reload windows.
Posted on Feb 09, 2009
We have repaired many of these systems. The board was damaged when the power supply shorted. You can get replacement motherboards at www.barebonekit.net click on the link on the left side for motherboards and look for Emachine.
I hope this helps, if so please rate my solution.
Posted on Jul 16, 2009
I'd say your PC definitely overheated. Usually when a CPU overheats, the first things that fail are the capacitors on the motherboard, not the CPU itself. Most times, a failed capacitor is fairly easy to notice. They usually bulge out on the top and/or leak a brownish fluid. If you can tell that one or more capacitors is bad, it means you need a new motherboard, unless you have the right tools to test each capacitor and replace the faulty ones and no other components were damaged by the heat.
Posted on Apr 13, 2012
Testimonial: "Thanks Jason. I looked for damaged capacitors visually, but did not see any obvious bad ones. I am assuming there could be heat damage to the board that would not be visible. I am going to replace the motherboard and see what happens. Do you have any suggestions on where to get this motherboard?"
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