Having problems with your HP L1706 17" LCD Monitor ?

My monitor cannot pick up signal.

\015 It dispalys on the screen VGA Input : NO INPUT SIGNAL\015

Answers :

If your monitor displays No Signal, it means there is no video signal coming from the computer. Monitor is working fine.

It may just be the monitor cable. Do you have another one, or one you can borrow from another computer, for a test?

If a known, good, working, monitor cable yields the same results, the problem is your computer.
The computer isn't working.

The problem may be due to the power supply. Most of the time it is.

This statement is given because of,
A) Most of the computers that come to my shop, have this problem.
B) If you look on the internet, it is a common problem stated.
C) Most of the problems on here, are due to power supply issues with the computer.

You may see, or hear fans spin. Lights light, and it may sound like the harddrive is running.
Problem is, the processor doesn't have enough power to operate, so nothing is going to get done.

The main rating for power of a power supply is Watts.
Voltage times Amperage = Watts.

1) ALL the lights use less than 1 Watt

2) EACH fan uses 2 to 3 Watts

3) A typical Processor uses 55 to 125 Watts.
Depends on what processor it is.

The power supply has 3 main voltage power rails.
A) The 3.3 Volt rail
B) The 5 Volt rail
C) The 12 Volt rail

If the power supply develops a weak, or failed voltage rail, the Processor does not get enough power. Won't turn on.

Most of the time a power supply fails because it is dirty inside. (And the inside of the computer)

The simple solution is to unplug the computer from power, open the computer case, and use a can of compressed air for computers, on a regular basis.

Install the plastic 'straw' into the nozzle, and shoot air into the inside of the computer in rows.

Start at the top inside part of the computer, going from one side, towards the other side.
Then go down towards the bottom.

Tip the case slightly with one hand, and use the other hand to shoot air towards the bottom, to remove the remaining dust/dirt.

Shoot air into the power supply, from the back of the power supply through the ventilation holes. (Inside of computer)

Use a few Q-tips, and clean the fan blades, center hub, and surrounding cage, of the power supply fan, then use air. (Back of computer)

The rest of the time the fault lies in bad Electrolytic Capacitors inside the power supply.

CAUTION!!
NEVER open a computer power supply!

The Electrolytic Capacitors inside, hold a charge for Weeks, sometimes Months, after the power supply has been unhooked from power!

You can get shocked Badly, or even Fatally!
Best solution is to replace the power supply. If you have another working power supply, you could use it for a test.

[Be sure to work on a table. Be SURE to touch the metal frame of the computer case, (Case open),
BEFORE you reach inside!
(Computer UNPLUGGED from power)

Your body carried Static electricity. Static can fry out computer hardware components, in a New York second!
Computer unplugged from power you're safe.
Touch the metal frame before reaching inside, the computer is safe.

If you get up for any reason, leave, then return, touch the metal frame again!]
Repair Help & Product Troubleshooting for HP L1706 17" LCD Monitor

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