Screen only On when lid closed

[Scratchgolfer]

Lenovo G500. Recently replaced Graphics cable. Though screen was gone as it remained black when laptop started. Been using laptop via HDMI port. Recently discovered screen actually comed ON when I close the lid??? Anybody got a clue what could be the issue

 

[Prostar Computer]

Faulty sensor, it sounds like.

What are you referring to when you say "graphics cable?" Is that the LCD video cable?

 

[Scratchgolfer]

Faulty sensor, it sounds like.

What are you referring to when you say "graphics cable?" Is that the LCD video cable?

Many thanks for taking the time to reply.

Yes the LCD video cable. It fractured meaning the screen didnt work so replaced it. Where would the sensor be? Could I have connected it wrong way round on reassembly. The screen currently comes on when the lid is about half to quarter of an inch from being closed. Its almost like I could have reversed the cable connections on a micro switch which activates with opening and closing the lid but I dont recall anything like that.

 

[Prostar Computer]

Happy to [try to] help.

Honestly, I have no idea where the sensor is. Without having previously worked on the G500, all I can say is that's something another tech would have to answer for you - preferably a Lenovo tech. I don't think the cable can be connected improperly very easily; from what I've seen on most systems, the connection at the monitor can go either way, while the connection at the board either can also, or it has a notch in the receptacle to prevent improper seating.

Do you know which type of cable you used (LVDS & pin count, or eDP, etc.)?

 

[Scratchgolfer]

Happy to [try to] help.

Honestly, I have no idea where the sensor is. Without having previously worked on the G500, all I can say is that's something another tech would have to answer for you - preferably a Lenovo tech. I don't think the cable can be connected improperly very easily; from what I've seen on most systems, the connection at the monitor can go either way, while the connection at the board either can also, or it has a notch in the receptacle to prevent improper seating.

Do you know which type of cable you used (LVDS & pin count, or eDP, etc.)?

Laptop LED Screen Cable for Lenovo g505 PN/MPN DC02001PS00
Cable Type: Laptop LED Screen/Panel Cable
Compatible Part Number: DC02001PS00

this is as good as I can do I am afraid. Cable replacement was reasonably straight forward, pretty sure it couldnt fit any other way .
Again many thanks for your input.

 

[jarotech]

Hi, the sensor is on the motherboard, it's a hall-effect switch, meaning it's magnetic. It's like if the magnet in the cover is reversed.

 

[Scratchgolfer]

Hi, the sensor is on the motherboard, it's a hall-effect switch, meaning it's magnetic. It's like if the magnet in the cover is reversed.

Firstly thanks for this, secondly how the heck does that happen??? It is bizarre. If I could type and see through a half inch gap I would be fine but how do i fix this?? How could it happen. Sorry thinking out loud. Do you think there is a solution to this???

 

[jarotech]

Maybe the sensor is defective, like Prostar mentions in his first reply. I don't know where is the magnet in the cover, if it's there at all. Do you remember if you put all the wires in the same location?