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HQRP AC Adapter / Power Supply for Yamaha PSR-280 / PSR280 / PSR-290 / PSR290 Keyboards Replacement plus HQRP Coaster, 600 related issues. ... is there an internal battery to protect memory and if so, do i need to replace it? yes there ...HQRP AC Adapter / Power Supply for Yamaha DGX-620 / DGX620 / DGX- ...
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For a statement, such as, "Motherboard not on", you would be stating the motherboard either does not receive power, or the motherboard does not use the received power.
Primer: You press the Power On button. The first chipset to receive power is the BIOS chipset. The Basic Input/Output System program is initialized.
BIOS looks to see what devices are connected, does a Ram Memory count, turns the Processor (CPU) on; and hands the computer over to the Operating System. (In this case a version of Microsoft Windows)
If the statement is the motherboard is not turning on, you are in effect stating the BIOS chipset is Not receiving power.
Diagnoses must start from the AC adapter (Charger) You need to know if the AC adapter is putting out the correct Voltage. Also while testing have an assistant, gently wiggle the cable FROM AC adapter TO laptop; and power cord TO AC adapter. Any fluctuation in the reading, means a broken wire.
AC adapter proves to be good, the diagnoses goes to the DC Power Jack. The DC Power Jack is the jack on the laptop, that the AC adapter plugs into. (DC_IN)
AC adapter removed, Battery removed; a small instrument is used to see if you can gently move the DC Power Jack. ANY perceptible movement means a bad DC Power Jack -> Replace.
DC Power Jack checks out OK, then the problem will most likely be the Power MOSFET's on the motherboard. They determine if the Battery is to receive a trickle charge, or full charge. Also determines if the laptop is to run off of the Battery, or just the AC adapter.
Using the HP Pavilion dv6000 series, and Pavilion dv9000 series of Notebook PC's; as an example,
"Gondo" <email@example.com> wrote in message
> This has been an ongoing problem with this laptop, and now I can
> hardly get it to power up at all.
> First, the AC/DC power adaptor jack in the back is very loose and
> power is lost intermittently when you move the jack around on the
> Once the green power light does come on, you press the power switch
> repeatedly to the left to turn the laptop on and nothing happens.
> by the combination of wiggling the power adapter jack around while
> pushing the power button repeatedly can you maybe get lucky and get
> to start up.
> I was just wondering what else might be bad internally besides the
> power adaptor jack. Possibly the connection to the power switch or
> switch itself? The AC/DC adaptor was replaced recently, so I'm
> sure that isn't the problem.
> It appears it will need replacement parts, so I'm looking for
> recommendations on where to find the applicable parts online.
To Fix Your Hp Issue,In Case You Still Having Problem Then Follow Us For On : HP Support
A) AC adapter (Charger), has to be KNOWN to be good, before going on. Used on a working laptop to see, or multimeter is used to check Voltage (DC)
The plug end that goes to the laptop, from the AC adapter, has a Center Hole, and a cylindrical outside metal shell.
The Function knob is set to DC Voltage. If just a symbol, the symbol is a dotted line over a solid line. If more than one DC Voltage scale, the Function knob is set to the 0-50 Volt DC scale.
The Positive (Red) probe lead of the multimeter goes to the Center Hole, and the Negative (Black) probe lead of the multimeter, goes to the cylindrical outside metal shell.
You should be reading 19 Volts DC.
Also have an assistant gently wiggle the cable FROM AC adapter TO laptop, and the power cable TO AC adapter. If there is a fluctuation on the reading, there is a broken wire, or wires, in one of those cables.
B) Check the DC Power Jack. This is the jack on the laptop (DC_IN) that the AC adapter plugs into.
Has a Center Pin, and an inner cylindrical metal shell. Battery removed, use an eraser on the end of a No.2 pencil, and see if you can GENTLY wiggle the Center Pin around.
ANY perceptible movement of the CENTER PIN, means replacing the DC Power Jack, (By the way, is it an 8510p, or 8510w?)
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.
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,
Go to Power Options --> On the plan you are using select change plan settings --> Change advanced power settings --> Scroll down till you reach battery and click the + next to it to expand the settings --> Where it says Critical battery level and Critical battery action (on battery) make sure that the level is at 5% and the action is to hibernate. If it's set to do nothing, it will keep running until it's out of battery and completely shut off. Plugging the AC adapter would give it more power. If that isn't the problem, check your battery's connection and consider replacing the battery.
The problem is probably not in the motherboard itself, but may be internal to the laptop. From what you've described the problem is either in the AC Adapter itself or in the power supply inside the laptop (the area where you plug the AC adapter into the computer. The first thing to try is another AC adapter if you can get a hold of one or purchase one if need be as it's the most likely source of the problem. More than likely it's providing enough power for the system to recognize it's attached and draw power from it, but there is likely a short inside it or the cords keep the power from being constant. If you do not have a full adapter to test with, you can replace the end that plugs into the wall with and universal plug - something you can buy at major retail stores. The adapters take a lot of wear and tear and can be damaged from all the stuff we put them through.
Remove Any Docking Stations or Port Replicators From the Computer Note: Docking stations and port replicators are optional equipment. If you are unsure if you have a docking solution attached to your computer, refer to Table 1 and Table 2 for examples. To remove the docking station or port replicator, perform the following steps: Shut down the computer. Remove the docking station: Universal Docking Stations: Disconnect the docking station's USB cable from the computer. D/Port or D/Dock: Remove any cable locks from the security slot on the right side of the docking station. Move the slide lock forward to the unlocked position. Press the Eject button and lift the computer from the docking station. C/Port II or C/Dock II: Remove any cable locks from the security slot on the left side of the docking station. Pull the locking lever forward until it stops to eject the computer, then slide the computer out of the docking station. Dell manufactures the following docking stations and port replicators (Table 1): D-series DocksC-series DocksSpecialty Docks D/PortLatitude? C/Port IIMedia Bases D/DockLatitude? C/Dock IIInspiron? Advanced Port Replicator Table 1: Dell Docking Stations (Click an image to enlarge it) Universal docking solutions are also available from third-party manufacturers including, but not limited to, the products below (Table 2): TargusKensingtonBelkin Table 2: Universal Docking Solutions (Click an image to enlarge it) Disconnect All Peripherals from the Computer Remove all external connections from the computer. This includes but is not limited to the following devices: docking station or advanced port replicator keyboard mouse speakers or microphone printers scanners USB or 1394 devices palm pilots zip drives secondary battery Plug the AC Power Adapter into the Laptop Computer Remove the battery from the computer. Connect the AC adapter directly to the computer Verify That the AC Power Adapter Has a Solid Green or Blue Light Verify the AC power adapter displays a solid green or blue light. Older Latitude? C Series laptop computer AC adapters may not have a light. The new E series power adapter indicator light is either a blue ring or a blue dot and is located at the tip, on the DC connector, not on the power brick itself (Figure 1). Figure 1: E Series Power Adapter Indicator Light Location Numbers reference image above: E Series Power Adapter Indicator - Blue Ring E Series Power Adapter Indicator - Blue Dot D series power adapters have a green lights located on the power brick (Figure2). Figure 2: D Series Powed Adapter Indicator Light Location Numbers reference image above: D Series Power Adapter Power Brick D Series Power Adapter Power Indicator Light Shut Down the System If the computer currently is turned ON, running on the battery, shut down the system: 1 Click Start. 2 Click Shutdown. 3 Choose Shutdown from the menu. 4 Click OK. 5 Allow the system to power off. Plug the AC Adapter into a Known-Good Wall Outlet Verify the wall outlet is known-good by testing it with another device, such as a lamp. Confirm there are no power strips, surge protectors, or uninterruptible power supplies (UPS devices) connected to the power cable. UPS devices provide temporary power for a computer when there is no electricity available from the wall socket, such as during a power outage. Plug the power cable into the known-good wall outlet. Power up the system. Replace the MiniPCI Door, Rubber Feet, and System Motherboard