Question about Acer AL1717 17" LCD Monitor

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How do I check the amps of the 5 volt supply on the monitor motherboard?

And what if it is bad? Is there a part that can be replaced, or do I need another monitor? How can this be fixed at low cost?? Please and thank you.

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Your question was presumably cut off in the title of your post, but on the power brick, there should be several statistics of the power supplied by the cable. There should be watts, Amps, and whether the output is AC or DC. I believe your monitor takes DC power, so if you are buying another power supply, make sure that it gives out DC power, not AC. Also make sure to get the specific wattage, and for a monitor that size, 3.0 amps should be more than enough to keep a steady power flow, and also keep the power brick at a reasonable temperature.

Posted on Aug 22, 2008

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I have an emachine t2885, when i hit the power button, i dont get any power to the computer, but the keyboard, speakers and monitor lights go on, but no power to the computer, help

I'm going to guess pwr supply 12 volts side. The 5 volts side lights up keyboard and mouse; both get replaced when they fix (replace) the power supply.

The hard drive and dvd player us the 12volts side.

Check 12 volt supply side if low disconnect hard drive check voltage again,, if 12 volts hard drive bad,,, if low disconnect dvd,,, if 12volts connect hard drive,,,if 12 volts dvd bad. of course this scenerio can go the opposite way. Do you know how to use a multimeter? Black box maintence is exciting.

Nov 27, 2010 | E-Machines eMachines Desktop PC

2 Answers

Desktop monitor port not working. processor, keyboard, mouse all powered on & working, you can hear it boot up. I use this with other computers, it works fine. monitor has power but goes to sleep. Is...

Ha, no kidding!
I just had a HP Pavilion a705w come in for repair at my shop!
Small world.

Okay, let's go with your theory that the power supply is okay, and the Processor is indeed operating.

Your theory is that the GPU on the motherboard isn't working.

No Signal on the monitor means No Video Signal.

The computer isn't sending out a video signal.

(The HP Pavilion a705w comes with Integrated Graphics.

Meaning the GPU is soldered to the motherboard.
Another term for Integrated Graphics is OnBoard graphics.
On the motherBoard.

GPU stands for Graphics Processing Unit.
A GPU can be soldered to the motherboard, {Integrated Graphics}, or soldered to a dedicated graphics adapter card.

Do you have a PCI graphics card around? Still have the installation disk also?
Computer unplugged from power, and observing anti-static precautions, plug it in, screw it down to the frame.
Connect the monitor to the graphics card. Plug the computer into power.
WAIT 1 minute. Turn the computer on. You may have bad graphics because you haven't installed the drivers off of the installation CD yet, but you should have graphics.

Don't have a PCI graphics card available, or no graphics showed up on the monitor?

Okay, then humor me for a moment.
Computer unplugged from power. Anti-static precautions implemented.
Take the ram memory module/s out, and clean the gold plated contact pins with a pencil eraser.

Start at the top of the pins, and brush going down towards the bottom.

Use air to clean off the eraser 'dust', then reinstall the ram.
Plug into power, wait 1 minute, turn the computer on.

Still no?

Have another known, working power supply around, that is an ATX power supply, has at least 250 watts, and has the proper power cables?
I'd like you to use it for a test.

No spare power supply?
Do you have a multimeter?

It's time to check the power out of that power supply.

1) Orange insulated wires are 3.3 Volts
2) Red wires are 5 Volts
3) Yellow wires are 12 Volts
4) ANY Black wire is a Ground wire.

The Positive (Red) lead goes to the power wire, the Negative (Black) lead goes to a Ground wire.
Multimeter is set to the 50 Volt DC scale.

(Auto parts stores sell economically priced multimeter's for around $10 to $15)

Back to your statements in your added comment.

At first it could have been something as simple as the Ethernet card was bad, or the onboard Ethernet was bad.

However, it could be that the motherboard has another issue, and one by one, the motherboards features are going downhill.
No internet. Now no graphics.
Could be this,

I still think the first place to check is the power supply.
It's a cheap quality Bestec power supply.
The Electrolytic Capacitors seem to be the first components that fail in these power supply's.

However, if the computer was dirty inside, as well as the power supply, this could also make a power supply fail.

I've stated what a weak voltage power rail would do. Not enough power to turn the Processor on.
What I haven't stated is that the two main problems with a computer is,

1) The computer is dirty inside, as well as the power supply.
'Kills' power supply's and motherboards.

2) Power supply's are the second item. A pre-built computer manufacturer typically installs a cheap quality power supply.
Saves them money.

Bestec, HiPro, and Delta, are three power supply manufacturers HP uses a lot.
Cheap quality components are used inside.

Mar 08, 2010 | Computers & Internet

2 Answers

When powering on get no input to monitor board nu a7n8x-e

Make sure you have connected into the correct video port. DVI should be used for LCD monitors and VGA should be used for CRT monitors. Since both ports look the same people often get confused. Try it and let me know.


Jan 02, 2010 | ASUS A7N8X-E Deluxe NForce 2 Ultra 400...

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Power supply suddenly 'dead'

You check the power supply using multimeter. but before everything make sure the you are getting power from the power outlet.

Here is how you can check the power supply with multimeter

If the wall outlet and the power cord are good, make sure the connection at the motherboard is secure. Then you may have to face the fact that the power supply itself is bad. If you have a multimeter, you can test the power supply output before purchasing a new one. Simply follow these steps:
  1. Turn off the PC, but do not unplug it. Open the system unit. Set the multimeter to read DC volts in the next range higher than 12 volts. Locate a power connector similar to the hard drive (or CD-ROM drive connector that is unused) and turn on the PC.
  2. You can also unplug a drive connector and use it. Turn on the PC and insert the BLACK probe into the power connector on one of the BLACK wires. Touch the RED probe to the YELLOW wire on the power connector.
  3. The multimeter reading should be +12 volts. Now touch the RED probe to the RED wire and the reading should be +5 volts. If no readings or different readings occurred, you’ll have to replace the power supply. If the readings were correct, you should check the P8 or P9 connectors at the motherboard. These connectors may also be named P4 and P5. To check these connectors, perform the following:
    • Insert the BLACK probe into P8 at one of the BLACK wires. Insert the RED probe into the P8 connector at the RED wire. The reading on the multimeter should be +5 volts.
    • Check the power going to the motherboard connections by inserting the RED probe into P8 at the YELLOW wire and you should get +12 volts. Leave the BLACK wire touching the BLACK wire at the P8 connector. Check the BLUE wire and the reading should be a -12 volts.
    • Now move the BLACK probe to the BLACK wire on the P9 connector. Test the WHITE wire by inserting the RED probe and the reading should be -5 volts. Check the RED wires on the P9 connector and you should get +5 volts on each red wire. You won’t get exactly 5 or 12 volts, but the readings will be very close, such as 5.02 volts.
    • If the Power Supply is a couple of volts off in either direction, such as when the RED wire should be reading -5 volts but it reads -8 volts, or if there are no readings, replace the power supply.

Mar 22, 2009 | Computers & Internet

2 Answers

No Beep No Display

motherboard problem motherboard can't display when switch on, the cpu fan faster no beeping . I had change power supply, but same.Check the keyboard LED,Not flash.I had remove the ram but can't hear beep. PC speaker ok conferm. Monitor display tested monitor its ok . But no comming display. Can you help me? How i can solve this problem?

Jul 03, 2008 | Intel Motherboard

1 Answer

Got flat screen as a gift

This monitor requires a power supply with a POSITIVE tip polarity.
Monitor requires 12 Volt DC @ 3.3 Amps output.
Make sure voltage is 12 Volts DC [absolute requirement]

Power Supply can have greater than 3.3 Amp capacity. More amp capacity increases price, so I wouldn't go for more than 5 Amps [minimum 3300 milliAmps, 5000 milliAmps will be more than adequate].

Put a surge protector on your computer and monitor to extend their life....better yet, a power conditioning battery backup system, that can supply constant voltage, to compensate line voltage when A/C, furnace, or other major appliance kicks on.

May 04, 2008 | SVA-USA VR 17S 17" Flat Panel LCD Monitor

1 Answer

Help Please!

power supply is bad on one of its legs(12 volt or 5 volt) you can have that bench tested at a service center or use a volt meter to check the output on the cables probably the 5 volt as the agp and the dvd roms cdroms etc need 5 volts to operate

May 01, 2008 | NEC MultiSync 1760NX 17" LCD Monitor

1 Answer

Monitor light blinks

have you tested the power supply connection feeds? test each connector I think you will find your power supply has failed on either the 5 volt or the 12 volt side more than likely 5 volts are down' the agp adapter needs 5 volts to run. since you have changed out every thing else I would replace that or test your dads power supply in your computer, that should do the trick

Apr 28, 2008 | Samsung Syncmaster 730B 17" Flat Panel LCD...

1 Answer

Sceen wont come on

check the amps of 5 volt supply of LCD motherboard. the current is ok but may be the ampears are down. (possible in most cases).

Feb 06, 2008 | Acer AL1717 17" LCD Monitor

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