Lenovo G550, no image, only backlight

[claudyu07]

hi Guys, have here a Lenovo G550 that i got in a job lot .
When it powers on i only have backlight but no image,
External is fine.
Intel celeron CPU with Intel Graphics.
I have tried different screen and different video cable.
Any ideas?

Thanks

[dj_ricoh]

Re: Lenovo G550, no image, only backlight

Cook the board

[claudyu07]

Re: Lenovo G550, no image, only backlight

Cook the board

Have no idea what you mean thanks

[claudyu07]

Re: Lenovo G550, no image, only backlight

Anyone?

[tata123]

Re: Lenovo G550, no image, only backlight

Check Filters and Resistors near the LCD Connector!

You need a schematic, but you can check if there is a damage the parts have a inscription with (FL, L, P (fuse)).

You can also heat the Intel Chip up, to check if this is a BGA Problem!

[claudyu07]

Re: Lenovo G550, no image, only backlight

Thanks.
i will check components and if nothing wrong will trow it on the rework machine for reflow and see after. thanks

[masud]

Re: Lenovo G550, no image, only backlight

Check Filters and Resistors near the LCD Connector!

You need a schematic, but you can check if there is a damage the parts have a inscription with (FL, L, P (fuse)).

You can also heat the Intel Chip up, to check if this is a BGA Problem!

Check Filters and Resistors near the LCD Connector!

You need a schematic, but you can check if there is a damage the parts have a inscription with (FL, L, P (fuse)). and

check 2/3 small transistors near the LCD Connector too.

[claudyu07]

Re: Lenovo G550, no image, only backlight

Good morning guys, i did reflow and same problem. now i will start looking for broken transistors , fuses....
Will post back.

[claudyu07]

Re: Lenovo G550, no image, only backlight

Ended up buying another motherboard . turned out was cheaper than time spent to try fix .
Maybe in future will come back to this board

[dj_ricoh]

Re: Lenovo G550, no image, only backlight

Now that you change it cook the old one.

[claudyu07]

Re: Lenovo G550, no image, only backlight

Now that you change it cook the old one.

im not familiar with the term 'cook' if you can explain please.
New motherboard seems to have problem with webcam. not detecting it . bought new camera and cable and problem so again mobo problem...