Testing a power supply

hi there.
Laptop performance slowing down, or the laptop isshutting off completely because the laptop is trying to protect itself from damage caused by an excessive heat build-up. ... There are times when a laptop will turn offbecause of a virus or malware, hardware or software problems/conflicts as well.2 Nov 2013

Don't panic!... Is your "laptop shutting off by itself" or "slowing down ...

https://www.youtube.com/watch?v=74agkgZdzkI
What is the problem if laptop shuts down automatically?If removing air doesn't fix shutdown issue, it is a faulty hardware (can be anything), related to overheating or serious power related failure, such as bad battery or adapter. Overheat issue will result in unit turning on, but shuts down after about the same time (i.e. 15 sec).29 Jun 2015My Laptop automatic shutdown in few seconds - Laptops - Laptop ...
What would cause a computer to keep shutting down?An overheating power supply, due to a malfunctioning fan, can cause a computer toshut off unexpectedly. Continuing to use the faulty power supply can result in damage to the computer and should be replaced immediately. ... Software utilities such as SpeedFan can also be used to help monitor fans in your computer.5 May 2017Computer turns off without warning - Computer Hope
How do I get my computer to stop shutting down?Cancel System Shutdown or Restart. You cannot cancel a restart or shutdown using the Shutdown Event Tracker Windows interface. It is only possible to perform this task from the command line. To cancel or abort system shutdown or restart, open Command Prompt, type shutdown /a within the time-out period and hit Enter.1 Apr 2013Stop, Cancel, Prevent, Abort System Shutdown in Windows 10/8/7www.thewindowsclub.com/abort-system-shutdown-windowsSearch for: How do I get my computer to stop shutting down?
or go to this link to find out more.
Laptop keeps shutting off after few minutes

There are a few reasons, bad power supply adapter, cooling fan is not working or there is dirt blocking the ports causing it to shut down, battery issues, "remove to verify" the DC jack in the laptop has become intermittent and must be dismantled down to the motherboard level and flipped over for solder touch up.

Test your PSU or replace it if your power supply units fan is not working your PSU is faulty

One bad lead can cause a computer to continue on a cycle or to shutdown or fail to detect/ boot up a computer hard drive

Test all leads that attach to your hard drive including electrical extensions,IDE,SATA

the leads from your "((motherboard to your hard drive))" make sure they have a secure connection and are not faulty or just replace them they could be faulty
make sure all leads that are attached to your drives dvd\cd 3 1/2 inch floppy have secure connections and are not faulty even the electrical extensions or just replace them they could be faulty a computer needs its connections to continue its cycle and have an end so any faulty leads will end up with a computer error hope this helps

The DC jack in the computer has detached itself from the motherboard causing intermittent shutdowns, the laptop must be dis-assembled to re-solder the jack back in place, and may need to replace the DC jack if the old one is not suitable.

The unit senses a fault in the power circuit. It is either in the power supply unit (PSU) peripherals or in the PSU itself.

• One of the peripherals might be loading down the PSU causing it to shutdown.

1. Check the power input terminals of the peripherals for any short circuit using an ohmmeter.
   
2. Replace any part found to be causing the issue.

• The power supply unit cannot run under load and shuts down. It is usually caused by bad capacitors.
  

1. Check the PSU board for any bad capacitor.
2. Replace bad capacitors with the same specifications.
3. Make sure to replace the capacitors in correct polarity.
4. Bad capacitors look like these:

what makes you think the ac park is ok
19vdc measured with a voltmeter proves this , only.
a 2005 (as old as) Laptop
its not new, things this old do fail.
Laptops are like dog years.. 7:1. so yours is 84years old
to fix a desktop is super easy
to test a laptop takes greater skills, the take down. is tricky
we take out the battery,
the the pack just make the fan run in the PC
does it>? if not the pack is bad.
or the MOBO regs are shut down. (shorts on any thing inside
some times the 19vdc is ok, at that pack
then 1 inches inside the PC its dead due to that silly power jack loves to fail. but not taking the thing down and testing that
its all just a guessing game...
the only insight there is on electronics, is power first.
no power, no joy.
test the power feeds first.

sounds like you might have an auto overvoltage shutdown circuit kicking in. The hivoltage goes to high and the monitoring circuit auto shuts down. More than likely trouble is in hivoltage circuitry. If you have a transformer that will allow you to bring up the set slowly without shutting down and you can look to see what's happening.

Hello;

So i guess that the PSU is good. As i diagnose of what you have said, i digested a conclusion that when the computer shutdown when application run. there a problem conflicting the application to another application or such an application trigering the system to shutdown.

Some causes of this problem are:

The system is infected by known and unknown virus
The driver of the system are not properly installed
The application program committed an errors trigering the system to shutdown.

Possible solutions:

1. Scan you system with a potent anti virus
2. Remove the installed driver of the sytem and reinstall it after restarting
3. Unistall the application that causes shutdown problem and you can reinstall it after restarting.
4. remove newly installed hardware or install the correct driver of the hardware.


Note in scanning your system with antivirus you should scan it it safemode.
some usefull links: http://www.precisesecurity.com/antivirus/online-scan.htm

If all the solution did not work to your system. please notify me for further solution.

best regards, melnavz

your set has indications of several problems. red green and blue. indcate convegence issue. the fact that the picture is concave is a indication of totall loss of covergence power supply. the convegence menu missing idicate loss of some voltages from what know as the flyback.AND SHUTDOWN. indicate further problems. generally when convergence fails ..not always the set wont shut down. it could be a simple issue but further trobleshooting would have to occur to narrow it down.

The flashing LED is because your system is in "sleep" mode. By default windows Vista puts your computer in sleep. What this means is it doesn't shutdown the power completely it leaves a little going through certain computer components (more specifically the ram) to speed up the boot time when the power button is pressed again.

In XP a the default shutdown scheme is a complete shutdown where power is turned off after the shutdown process is done. If you are using XP you are putting your computer to sleep when shutting down.

As for the boot problem. Newer motherboards have an LED on the actual board to indicate that it is receiving power. If it is of either the power supply switch (at the back of the case) if off or the motherboard connection is loose and the shaking makes it fall into place. (Shaking is usually not necessary and indicates a problem...)

There are a few possibilities I can deduct from your description:

• the connection from your power supply to your motherboard isn't properly seated and is causing this
• the power supply switch (not the case switch) is being  turned off and results in the computer taking a few seconds before the internal LED become solid
• ... the dreaded sign that the power supply is failing and is on it's last legs...
  

My suggestion is to check all connections and if that doesn't work borrow a power supply from a friend and swap them to see if it boots properly.

(If a friends with a spare power supply isn't an option a local PC repair shop should be able to help you out... but probably for a fee...)