THOMSON 50M14DP Service Manual page 25

MHL detect control circuit as follow. MHL_DET signal will be set to high level by
peripheral equipment when MHL peripheral equipment's line is connect to P801.
MHL signal is inputted to Main IC (U104) directly, and is used for Main IC to detect
and estimate. Otherwise when MHL is in high level, Q800 is break‐over, Q805 is
cut‐off. So G of Q806 is plugged up and Q806 is cut‐off. Then normal HDMI's HPD
signal will be cut‐off. MHL_DET is in low level when MHL peripheral equipments are
not connected in.Q800 is cut‐off. Q805 is break‐over. G of Q806 is dragged to low
level.Q806 is break‐over. B of Q803 will be dragged to low level and cut‐off because
of Q804 is break‐over. Then HPD is plugged to high level by OPWR5V,and is detected
as Normal HDMI to input.
25