Question about IBM (24P6829) for NetVista M41 160-Watt Power Supply

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I am not able to boot the computer

I am not able to boot the coputer and I cna see that poer supply till the AC/DC converter, but LEDs are not lighting up. Looks like some problem with the poer unit

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  • IBM Master
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More information would be nice, are all the cables hooked up correctly? LED's are based on the motherboard outs, not necessarily the PSU. do you get any power at all? can you hear it boot at all? if there is absolutely nothing then i believe either the PSU is jacked and you need a new one, or you have something connected inproperly.

Posted on Oct 03, 2009

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  • Master
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Id make sure the cords on the back of the power supply and the wall socket are all the way in. After that I'd open the case and make sure that the hardrive, and cd-roms, and the mother bored are connected completely to the power supply.

If you have transported or moved your comptuer recently this could be the problem. Also look on the power supply you should see a fuse on it. Make sure that you can read the # on it. (it will say the size of the power supply)

If these don't help then it is very possible that your power supply has gone out. Espically, if its an older comptuer. Also make sure the wall outlet you are plugging it into is working correctly. Try plugging a lamp r something into it and see if it works, or if the light flickers.

Posted on Oct 03, 2009

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  • Master
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Replace the power unit. Go to eBay to find a reasonable priced one. They are fairly simple to replace, just make sure you are grounded and that you hook everything back the way it was. You will need the part number to find the exact one on ebay.

Posted on Oct 03, 2009

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1 Answer

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A rectifier is an electrical device that converts alternating current (AC), which periodically reverses direction, to direct current (DC), which flows in only one direction. The process is known as rectification. You can't run DC through a transformer to change voltage/current because it works on the building and collapsing of the field that comes with the sine wave of each phase. DC is just a straight line.

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If a PC suddenly fails to boot properly, you should perform a hard reset as the first action. Performing the hard reset will correct many problems. If the computer still does not start properly, select your symptom from the list below to guide you to the recommended corrective actions.
  1. Disconnect all peripheral devices and remove all USB devices and SD media cards. You want to test the computer not the accessories!
  2. Disconnect the AC power adapter, remove the battery, and then press and hold the power button for at least 15 seconds to drain all residual power and restore default startup settings.
  3. Reconnect the AC power adapter (but do not insert the battery), Press the Power button, Look for glowing LEDs near caps lock and num lock keys, and Listen for sounds of a fan or other moving parts turning.
  4. If the computer does not start, the LED lights do not glow, and the display is black, you can perform one or more of the following actions to resolve the no power issue.
    • Verify the computer is receiving power from the AC adapter . Verify that the AC adapter is not damaged and is connected correctly to a working wall outlet plug. Verify AC power is connected to the system board by examining the AC adapter, wiring, and pin connection for damage. The keyboard LEDs will glow when AC power is connected to the system board. Damaged components, like the AC adapter or the pin in the power connector, may require an HP-certified repair.
    • Use a different AC power adapter . If you have access to a different AC adapter or power pack that is designed for the computer, connect it to the notebook and try to start the computer. If you own or have access to more than one notebook, verify that you are using the adapter which belongs to the notebook. CAUTION: Using a power adapter that does not meet the power requirements or has the wrong type of connector may damage the computer. On newer notebook models, connecting the wrong adapter to the notebook may cause the power LED lights to blink but not power the computer.
    • Remove the battery and boot on AC power only . A discharged or defective battery may prevent the AC adapter from supplying enough power to start the computer. To verify that power from the AC adapter is available for PC; remove the battery, connect AC power adapter, and press power button. If available, try using a different AC adapter, that is rated for the PC, and repeat this test.
    • Remove the AC adapter and boot on battery power only . A defective AC adapter may not charge the battery and prevent the computer from booting on battery power only. To verify battery power available for the PC; connect AC power adapter, allow battery to charge for 30 minutes or more, disconnect the power adapter and press power button. If available, try using a fully charged battery, of the same type, from another computer and repeat this test.
      • If LEDS do not glow and the fan or hard drive do not spin, battery may need to be replaced.
      • If tests of both the battery and the AC adapter fail, there may be a problem with system board requiring service by HP.
      • If LEDs glow and PC boots, the AC adapter may need to be replaced.
      • If LEDs glow, but PC does not boot go to LEDs glow, fan is heard, but display is black or blank section.

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Yes you can... but, this will cause you a lot of hassle. You'd need to get yourself an AC/DC converter because your amp needs 12 volts. Do not use your computer's power supply unit for the 12volt input as your amp eats up alot of power so you might overload your computer's power supply unit (PSU). After getting the AC/DC converter for your amp. You need to rewire your audio input going to the amp so that it uses a 3.5mm jack so you can easily plug it in to your computer's audio output. I hope this helps.

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1 Answer

Hp computer. hard drive light is solid yellow pc non working


What has transpired is the power supply is bad. Electrolytic Capacitors inside have failed. These capacitors relate directly to the voltage power rails of the power supply. They are filters.

Little more detailed.
Your computer power supply converts AC electricity into DC electricity. (A flashlight battery is an example of stored DC electricity)
AC comes into input Electrolytic capacitors. Goes to a rectifier bridge, and on through various other components. Along the way, this DC voltage is considered 'Raw'. It needs to be a steady, 'clean', supply of DC voltage. There are Electrolytic capacitors used in the final stage, to convert the 'raw' DC to 'true' DC.

In a computer power supply the Electrolytic capacitors are the weakest link. They are usually the first component to go out.

You computer power supply converts AC voltage into three DC voltages. 3.3 volts, 5 volts, and 12 volts. These are the power rails.

When one, or more Electrolytic capacitors are weak, they make a weak voltage rail.
To simplify explaining the construction of an Electrolytic capacitor, let's just state they are small aluminum 'cans', and have a seal at one end, or both ends. Inside there is an Electrolytic paste.
This paste can break down, and when it does it forms a gas. (Hydrogen gas) This gas expands inside the 'can', pushes up on the seal/s, and makes Electrolytic paste ooze out.

So much paste loss, and the capacitor can operate in a weakened state. Too much paste loss, and the capacitor fails.

ALL the lights in your computer use less than 1 Watt. EACH fan uses 2 to 3 Watts. A harddrive just sitting there spinning, may use up to 5 Watts.

A processor uses 55 to 125 Watts! Depends on the make and model.
Since the power supply is to weak to provide enough power to turn the processor on, the harddrive isn't activated. It just sits there and spins. No Boot record on the harddrive is found, so no Operating System is going to be running. (WinXP is an example of an O/S)

This essentially means No computer! Harddrive activity light indicates yellow, then goes out. There is no harddrive activity.

No signal from the computer, because the computer isn't working.
Monitor stays in Standby, because there is no signal from the computer.
Power supply failure is 70% of computer issues.

Why?
Owner neglects to keep the inside of the computer, and the power supply clean. Doesn't use a can of compressed air for computers regularly.
Also there is another issue that the owner has nothing to do with.
Capacitor Plague.
http://en.wikipedia.org/wiki/Capacitor_plague

Solution? Replace the power supply.

I know the above info may seem like a 'Hard pill to swallow', but as stated. A weak power supply will still spin fans, and light lights.
Harddrive may spin, or spin up, then stop.

The processor isn't getting enough power.

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1 Answer

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Actually i haven't fixed the problem as yet but i did find some info that would help me to fix problem.
I went to google and entered keyword,,, Electronic parts,,there came up a page,,and i went to several manuf sites till i found a replacement transformer,,then i disassembled the power supply and am now waiting for a replacement transformer.

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