Acer 4741 dislay off problem

[dspok]

Hello,

I have Acer Aspire 4741 with board 09920-3 JE40-CP MB 48.4GY02.031 machine. It works fine in battery but adapter is inserted display goes off but laptop is running and display never comes back.

I have adapter plugged in + battery inserted then display goes off after acer logo and laptop still running doesn't turn off if power not pressed.

Also same thing happens only on adapter.

I couldn't figure out, is there somebody to help?

[dspok]

Re: Acer dislay off problem

schematic here https://www.badcaps.net/forum/showpo...60&postcount=2

[mcplslg123]

Re: Acer dislay off problem

Its very likely a bios issue and not hardware issue. Did you flashed known good bios??

[dspok]

Re: Acer dislay off problem

Its very likely a bios issue and not hardware issue. Did you flashed known good bios??

I will try with bios.

edit: I can't get official bios becoz SNID 02704936420 not found.
Can anybody provide me?

[dspok]

Re: Acer dislay off problem

i tried official bios and it didn't work, same issue.

[stingerchamp]

Re: Acer dislay off problem

Hello,

I have Acer Aspire 4741 with board 09920-3 JE40-CP MB 48.4GY02.031 machine. It works fine in battery but adapter is inserted display goes off but laptop is running and display never comes back.

I have adapter plugged in + battery inserted then display goes off after acer logo and laptop still running doesn't turn off if power not pressed.

Also same thing happens only on adapter.

I couldn't figure out, is there somebody to help?

Replace adapter,

[mcplslg123]

Re: Acer dislay off problem

Compare LVDS pins voltage under both the scenarios-when display goes off & when display is ok. You will get the clue.

[dspok]

Re: Acer dislay off problem

Replace adapter,

Not a adapter issue in my opinion, I did checked though.

Compare LVDS pins voltage under both the scenarios-when display goes off & when display is ok. You will get the clue.

I will give a try, thank you for suggestion.