820-00165 no external display on thunderbolt

[raainxx]

Hi,
i have this board without external display. it work well on the internal display, but my customer need to work on external display. No liquid, very clean board.
i have PP3V3_TBTLC = 1,1V, where is generated this power supply, on U1900?
thanks

 

[2informaticos]

PP3V3_TBTLC comes out from U2800.

Do you get correct voltage at L3200?
TBT_A_HPD goes high (3V)?
If yes, check DP_TBTPA_HPD.
U3220 is a possible suspect...

 

[raainxx]

Ok thanks
i change U3200, the problem is solved.