please help toshiba c850 no display just work on external

[doctormasry]

toshiba c850
plf/plr/csf/csr DCS mb rev :2.1

no display but it work in crt conn
when i connected to lcd monitor (crt external ) work good and data and boot win

but there is no data on it's monitor (internal)
i changed screen but no new
i changed i/o but no new
reprogram bios but no new
two pictures attachments for LVDS connector voltage measurement

thanks

[BalkanBoy]

Re: please help toshiba c850 no display just work on external

Have you checked hall sensor? Maybe it thinks lid is closed?

[doctormasry]

Re: please help toshiba c850 no display just work on external

Have you checked hall sensor? Maybe it thinks lid is closed?

i checked it and change it too no new

[mon2]

Re: please help toshiba c850 no display just work on external

Watch this:

https://youtu.be/5Tv2HnU6Ouo

[doctormasry]

Re: please help toshiba c850 no display just work on external

Watch this:

https://youtu.be/5Tv2HnU6Ouo

thanks
do you mean vga chip is problem
and the problem solved by dis to uma conversion ?

[mon2]

Re: please help toshiba c850 no display just work on external

The dude in the video is using hot air to temp fix the the video controller. If your unit has one then he is claiming that 99% of the time it is the fault.

Perhaps consider to test in the same way with the heat gun to see if your LCD comes to life or not.

BTW: Do unplug the adapter (which he did not do) in this video while he was working with the logic board.

[doctormasry]

Re: please help toshiba c850 no display just work on external

The dude in the video is using hot air to temp fix the the video controller. If your unit has one then he is claiming that 99% of the time it is the fault.

Perhaps consider to test in the same way with the heat gun to see if your LCD comes to life or not.

BTW: Do unplug the adapter (which he did not do) in this video while he was working with the logic board.

thanks for you @mon2
i converted it from dis to uma and work well
thanks again pro