Question about Computers & Internet
Power jack lit but not the middle of the 3 led lights at bottom left of case. I have tested the power switch board by sub with an identical 2nd comp and is good. On first power on attempt the power switch led flashes along with the speed bar lights then nothing. Further attempts or holding down power switch for 5 secs or more has no effect.
Ya know........Pavilion dv8 is a Series of Notebook PC's.
Encompasses a LOT of models in the series.
Have no idea of which LED in front you are referring to.
1) Test the AC adapter (Charger) with an economical multimeter.
Average cost is $5 to $12.
Set to DC Voltage, and check the output voltage of the AC adapter.
As far as I can tell the DV8 series uses 18.5 to 19 Volts. (DC)
Use an AC adapter that is rated at 90 Watts, NOT 65 Watts; if using a replacement AC adapter.
The port on the laptop that the AC adapter plugs into is a DC Power Jack. (DC_IN)
The plug end on the power cable from the AC adapter, and plugs into the DC Power Jack, has a Center Hole, and an outside cylindrical metal shell.
The Center Hole is the Positive connection. This is where the Positive (Red) probe lead of the multimeter goes.
The outside cylindrical metal shell is the Negative connection. This is where the Negative (Black) probe lead of the multimeter touches.
Also have an assistant gently wiggle the power cord TO AC adapter; and power cable FROM AC adapter to laptop.
Intermittent reading indicates a broken wire, or wires.
DC Power Jack LED lights up? Means nothing to me. I want to know the FULL DC Voltage is getting TO the laptop, and there are no breaks in the wires of the power cable, or power cord of AC adapter.
THEN AC adapter checks out.
2) AC adapter checks out?
What condition is the DC Power Jack in?
Battery removed, use the eraser end of a No.2 pencil, and GENTLY see if you can wiggle the Center Pin around.
ANY perceptible movement of the Center Pin, means replacement of the DC Power Jack.
Fortunately for this series the DC Power Jack is connected to a cable with wires, and they end in a plug connector. Which plugs into the motherboard.
It is now a DC Power Harness.
HP calls it a Power Connector Cable.
3) Next in line are the Power MOSFET's, in the power circuit section, on the motherboard.
Should be on the motherboard, near where the Power Connector Cable plugs in.
Rectangular shaped with 8 'legs'. ('Legs' are J-Leads)
Believe one or more to be the problem.
Typed the rest above because it is a power flowchart, and when diagnosing always go through the steps.
Would s-uck to replace a motherboard, when the problem was an AC adapter, it's power cord, or the DC Power Harness.
This is more on the subject, by using the HP pavilion dv6000 series, and Pavilion dv9000 series of Notebook PC's; as examples,
Further this is to show the availability of the Fairchild Semiconductor - FDS6679 - Power MOSFET, and Alpha & Omega Semiconductor - AO4407 - Power MOSFET,
AO4407 has been phased out. Let's look at one of the cross-reference examples given,
That is correct. $1.01 USD for a FDS6679, and 78 cents for a substitute AO4407.
Also check the MLCC's (They are also SMD. Surface Mount Device)
Multi-Layer Ceramic Capacitor
Here are examples. Not correct values, Capacitance, (MicroFarad's), and Voltage,
These will be close to the Power MOSFET's.
See if any are burned, or blistered.
HP Support > Pavilion dv8-1100 using for an example > Manuals download page,
HP Pavilion DV8 Entertainment PC - Maintenance and Service Guide; in blue.
This is a free Service Manual.
Remove ALL Power. Remove the AC adapter, and Battery.
USE an ESD wrist strap, and have it's alligator clip attached to a good ground source.
For additional questions please post in a Comment.
For additional questions please post in a Comment.
Posted on Dec 11, 2012
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Posted on Jan 02, 2017
I'm sorry to say this sounds like a system board failure. On my HP DV200t, a very similiar issue occured, eventually only the led where you plug in the power cord would turn blue. I replaced the system board and all the issues went away.
Hope this helps, and I am sorry to be the bearer of bad news.
Posted on Aug 31, 2009
SOURCE: Computer shut down and won't
If your pc will not turn on immediately it is possible that your laptop is overheating. Try using compressed air and blow out dust and dirt. If it still does not work, you have a faulty cooling system.
Posted on Apr 23, 2011
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