820-3332 no display at startup

[raainxx]

Hi,
i have this macbook pro with strange problem, when i start the mac, i hear the dong but without display (nothing with torch), he start on the system when i change the volume sound i hear dong.
i try another display same problem. I close the display wait 1 min after he go in sleep mode, i open the display and i see the desktop and he work well after that.
Do you have any idea about my problem?
thanks

 

[aprendiz]

HIstory??? Water damage??? dropped?? SMC_LID when there is no image???

 

[raainxx]

Nothing the computer stop to work normally without nothing (no water, no trace of fall). i verify the motherboard on the other side, no trace of liquid. tomorrow i check the SMC_LID.
Another information, when i plug a external display, magsafe adapter & keyboard/mouse, i haven't video on external display. or when i have display on screen and i plug external screen, the display don't change mode.

 

[aprendiz]

A common failure is bad soldering on U8900.....

 

[raainxx]

I reflow only U8900 or change it?

 

[dukefawks]

Resolder with fine solder tip and some leaded solder.

 

[raainxx]

I resolder U8900 but no change.
is it U8000?