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ok I have an other problem. While pressing the start button no Lenovo start sign is shown. Connecting an external display via HDMI shows also nothing. Do you have an idea what this could be? I would exclude a display failure because HDMI does also not work. The fans also have a higher drive than they have normaly.
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I realize that you removed the battery and tried starting on the power only but try a full power refresh to see if this works.
This is different because you forcibly remove all the power from the motherboard in the hope that this will reset the BIOS software in case it has become corrupted.
It seems like this has happened to your laptop as a prolonged hi-speed fan on startup generally indicates a problem with POST (power on self test). POST occurs when the laptop is first turned on and the BIOS checks that all the hardware is OK before it starts booting into the operating system (Windows) i.e. Start →POST→logo on screen→boot into Windows
The procedure is to disconnect the charger if it is connected, open the laptop and disconnect the battery from the motherboard, (you don't have to remove the battery, just disconnect it) then press and hold the Power button operated for a full 30 seconds and then release it.
Doing this drains all the power from the motherboard which resets the BIOS software back to its factory default condition as you are forcing it to try and turn on, which obviously it can't do because there is no power connected to it.
Next reconnect the battery, reassemble the laptop, reconnect the charger and check that the laptop is charging OK. If it does allow it to charge for a few minutes and then try turning in on.
If it turns on OK there may be a message about the date and time being incorrect. This is normal as the BIOS has been reset. Once you correct the date and time the message won't appear the next time the laptop is started. Also any user definable settings in BIOS that you have changed to suit whatever operating requirements you wanted, will have to be changed back again as well.
If it still doesn't work you may need the schematic to find out what's wrong. (I think that the motherboard is an Compal LA-B111p, check what is shown on the motherboard to be sure)
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first of all mny thanks for your detiled discription. Unfortunately this also does not help. The display shows nothing. There is also no backlight. It is completly dark. Do you have an idea how I can verfy whether the display is faulty? I think even if the internal display is broken, an external diplay should work. Or am I wrong?
it is an LA-B111P
What I think is happening with your laptop, is that it is not even starting POST (power on self test) tests after you turn it on, so that you can get into BIOS or boot into Windows as there are no error LEDs shown e.g. combination of blinking Power, Battery, HDD LEDs or at least you didn't mention any. That is why I suggested trying to reset the BIOS in case it was corrupted as sometimes a corrupted BIOS can prevent the laptop from even starting POST.
If POST was successful and the screen was faulty then if the screen was dark you could check for faint images using a flashlight at an angle close to the screen in case it was a screen backlight problem. If no images are seen it still could be the screen but you don't know if the OS (Windows) has been loaded or not. I would suspect not if an external monitor wasn't showing anything - did you remember to press Fn+ F3 a few times to change the display from laptop screen only to external screen only, to both screens on together?
If the laptop is not starting and passing POST there won't be any display at all as it hasn't gotten far enough in the startup procedure, to even get into the BIOS menus, let alone Windows OS.
In BIOS there would be a display (if everything is OK) because the video drivers are loaded from the BIOS chip and not from Windows on the HDD but they are only basic vga drivers as this is all you need.
Also you can't connect and use an external monitor until the operating system has been loaded successfully i.e. Windows loaded OK. External monitors won't work when checking the BIOS menus, only the laptop screen itself (if POST was successful)
The sequence for a PC when it is first started is Power button pressed → motherboard power supply startup sequence initiated → start POST → successful POST indicated by maker's logo (Lenovo) seen on screen → boot into the OS e.g. Windows → Windows loaded OK, Windows logon screen or desktop display seen
During POST the BIOS checks that all the hardware that is necessary to allow the OS to be loaded is working OK e.g. CPU, ram, GPU video adapter, necessary motherboard controllers HDD etc. No point loading the OS if the hardware is not working
The CPU and ram and video are checked very early in the POST test sequence and if one is not working you should get error LEDs on the laptop. There will be no display on the screen!
POST is very quick, usually <3 seconds and then you have only about 2 -3 seconds to get into BIOS before it boots into Windows.
Normally you press F2 between the time you see the Lenovo logo on the screen and the time you see the "loading" Windows message on the screen. If you miss the small period of time to get into BIOS i.e. you pressed the F2 key too late, you have to start again or get into BIOS through the Windows OS when it has loaded.
The schematic will help to identify the type of any faulty component on the board and also how to test the various voltage supplies on the board that are necessary for it to work.
Board level fault finding can be difficult if there's no obvious sign of a problem e.g. heat stressed or burnt out component(s) or signs of water and mechanical damage on the motherboard if the laptop got wet or was dropped
ok, you are right I did not mentioned the LEDs. The Power LED (left one) is on. The second from the left is on and flashes shortly after 5 seconds. The third one is off. And the last one (HDD) is off but it flashes every 5 seconds. May this help to locate the failure better?
What I am wndering, the second from the left (accu) has a different color than before the hard reset. Now it is white instead of orange. Does this indicates something?
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@andreasgaede your laptop is a Lenovo Y70-70 Touch? what have you checked and what have you tried to fix this?
oldturkey03 tarafından
Thank for your replay. I tried a lot but nothing helped.
# I wait until the battery was empty and started it with pluged power supply.
# After power button I pressed F2 and F12 to try to enter the Bios setup, without success
# I checked the connection of the LCD cable on both sides LCD and Mainbord side.
# I tried an external Display via HDMI, but there was nothing shown
# I removed teh Battery and tried to star just with power supply
# I tried to start with removed RAM modules and also with removed HDD
All these things doesn't work at all. So Ihave no further Idea
Andreas Gäde tarafından
@andreasgaede
Have you tried pressing the Novo button and checked if the laptop started at all?
jayeff tarafından
What is the Novo button?
Andreas Gäde tarafından
@andreasgaede
See Item #8 on p.2 & p.1 of the user guide for the laptop model you selected to find out what the Novo button is used for and where it is located.
jayeff tarafından
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