Aspire 7520 - will not start or then will not shut off

Hi New here,


My Acer Aspire 7520 Gemstone Vista,

Will not start but I can hear the fan start then stop after a couple of secs, also the power and hdd leds flash on for 4 secs and then off for 4 secs and keep looping.

But then if I press the on/off button to turn the machine off it will not turn off, even holding the button for 4 secs or more. The only way to turn it off is by disconnecting the battery.

Nothing is connected and nothing appears on the screen.

Help

 

Thinking that the Hdd may be at fault I purchased a new drive.

I cannot still get the machine to start, only as described above, not the Logo or NVIDIA to show and I can't get to 'F2' to enter the BIOS. I put the old drive back its still the same.

Could there be a battery or Power adaptor fault, as its the same with battery removed and just the adaptor ??

 

Try hard resetting the system.
Unplug system from all power source then press and hold the power button for 60 seconds.
If it still doesn't help unplug all power, reseat the RAMs and try again.
If still doesn't work there could be a hardware issue.

 

Thanks for the reply,

Having searched for possible reasons or tips on this problem, It seems to be a common fault with the 7520. Either the CMOS Battery having a bad contact or Motherboard problems.

Read: http://www.techsupportforum.com/har...43165-acer-aspire-7520-repeats-going-off.html

thanks

 

Its been suggested that I remove the CMOS Battery to reset back to default factory Bios settings. But the battery is soldered into the board unlike my Tower PC.

Is it just the case I unsolder one of the terminals using a small soldering iron used for IC work, do a hard reset with the power button with the main battery disconnected, then reconnect all and try and get into Bios (F2) when restarting.

 

Well I done the CMOS battery bit, left it disconnected for 1min. then did a hard reset for 1min. reconnected battery and main battery.

Restarted as before the network and hdd led lit, fan runs for a few secs. then stops and then the dreaded loop starts again.

Does this mean, its time to 'Find a man who can' repair it.

Would it be worth the effort to write to ACER stating that this machine is fairly young of 16mths and where there is a common fault with these models, ask them to accept some responsibilty and carry out a repair.

 

Just been to this link : http://support.acer.com/acerpanam/no...300faq39.shtml


Just had a go,

When the ac power is just plugged in and mains switched on, no power indicator lit (green led).

But when power button pressed to start, power indicator lit (green led), and then back to normal loop on/off.

The link says the power indicator (green led) should be lit when just switched on at mains and plugged in. This is a new adaptor and the same happened with the old unit. ??

 

If the notebook does not power on:



Make sure the ac adapter is correctly plugged into the notebook and into the power cord.



If everything is plugged in correctly and it still will not power on, follow these steps to complete a ‘power reset' of the notebook.

1.
Unplug the ac adapter. Keep ac adapter unplugged.
2.
Remove the battery and keep the battery unplugged.
3.
Hold the power button down for 15-20 seconds. (Nothing will appear on the display and none of the lights will light up.)
4.
Release the power button and plug in the ac adapter ONLY. (Please note that a power indicator light should be lit on the ac adapter when it is plugged in).
5.
Normally power on the notebook.
6.
If the unit does not power on, remove the ac adapter and insert the battery into the system.
7.
Plug the ac adapter back into the system, the battery charging indicator light will light up.
If the battery charging indicator light does not light up, the ac adapter may not be providing proper power to the unit, and may need to be replaced.

 

thanks,

But isn't that what is said in the link in my last post and I've tried that.

 

1) Can anyone confirm whether they have thier Acer repaired with the same problem. ?

2) Can anyone confirm whether this fault is the Motherboard or what. ?

thanks

 

!!!!!!!!!BUMP!!!!!!!!!!!!!!!!!!

Nobody had this fault ???????

 

I have done some tests as reseached on various forums as below.

I removed Ram, CPU, HDD, DVD drive and carried out the tests as below with power supplies and then refit all and retested as below with power supplies.

1) First with the Mains supply, but first with the battery removed and a hard reset before connecting the supply, pressed fn+esc and held while connecting supply then pressed power button and the machine started with fan blowing, led surrounding the power button, power led at front of machine and network led are all lit. Then released fn+esc after a few seconds and the machine continued to run as above until all power supplies removed as it will not shut down via power button.

2) Did the same again but with battery only, but first with a hard reset and pressed fn+esc and held while connecting battery then pressed power button and the machine started with fan blowing, led surrounding the power button, power led at front of machine and network led are all lit. Then released fn+esc after a few seconds and the machine continued to run as above until all power supplies removed as it will not shut down via power button.

3) Did the same again but with battery fitted and using mains supply , but first with a hard reset and pressed fn+esc and held while connecting mains supply then pressed power button and the machine started with fan blowing, led surrounding the power button, power led at front of machine and network led are all lit. Then released fn+esc after a few seconds and the machine continued to run as above until all power supplies removed as it will not shut down via power button.

4) But if started as normal, the we are back to the stop/start loop with the fan stopping on its first start-up after a second or so, but the led surrounding the power button, power led at front of machine, network led and HDD led stay lit for a few seconds then shut down and restart with these leds only in a loop till all power supplies are removed.

At all times the screen remains black/blank. I cannot at any stage enter BIOS (F2) or Safe mode etc. Also with the above tests, it is said that the Power Button led will flash after a few seconds where the BIOS/CMOS is being recovered, mine don't just stays lit. !!


But still don't know what the problem is, whether its a BIOS or Hardware problem. ??

Any clues ??

Thanks

 

Off all the responses I have seen, not one has suggested overheating. I have been asked to investigate a 7520 that does exactly the same and if you listen closely after switching on you can hear a sizzling sound that increases in volume until the laptop shuts down.
Having removed the access plate to the cooling fan I discovered the heatsink cooling fins blocked by a mat of dust and cat fur. However, even after removing it the same problem occurs. I have noticed that although the cooling fan runs at startup it quickly switches off and does not restart.
I have reseated the heatsink with new thermal paste but I don't have the thicker pads to replace (where can I source them - anyone .
If I use a vacuum cleaner to draw air over the graphics chip then the laptop starts and runs as expected. So questions
1 - what controls the fan starting and stopping? (it is a three wire connection)
2 - can I reconfigure fan wiring such that it runs continuously?
3 - is the overheating of the graphics chip likely to have affected the mobo soldering?

Thanks and Regards,

PaulO999

 

Thanks,

But my problem turned out to be a motherboard fault after spending weeks remelting, updating bios, new ram, new cpu and etc.

But now has been put rest and broken up.

Found since the Acer range have a flimsy chassis compared to such as HP, which don't help motherboard.