Abnormal Sound - THOMSON 50M14DP Service Manual

check the relative channel circuit's component whether have obviously short and
virtual jointing. It is need to use forehead method to deal with the covert reason. It is
need to check Tuner's outputs for TV source abnormal display. Because of Main IC's
high degree of integration, all of the video signals are transmitted to the back end
after processed by main IC. All of the sources' abnormal display may caused by the
main IC's abnormal run. So it is need to judge the problem is caused by the main IC
or fore‐end circuits. You can do like this: Put the good machine's TV/AV signal into the
bad machine's Main IC ,and put the bad machine's TV/AV signal into the good
machine's Main IC. If the problem follows the action, the problem is caused by
fore‐end circuits. If the problem not follows the action, the problem is caused by the
Main IC or the periphery circuits.
6.3 Abnormal sound
Some of the sources
defeat
Check the abnormal
source's audio signal has
been inputted into Main
IC correctly; Check the
HDMI EDID
HDCPKEY.
Check the Main IC'
periphery circuits.
Try to upgrade
software. Change
main IC, DDR.
It is need to check Tuner's outputs when in TV source. And check the IIS signals from
main IC. Check the Mute circuits and AMP reset's function.
Abnormal sound
No
Check the signals
from Main IC to
and No
AMP; Check IIS and
IIC bus.
Check the power
supply for AMP;
Check the Mute;
Check the Reset
signals of AMP
29
All of the sources defeat
Check AMP's outputs
Ok
Ok
Check the
filter
capacitance
and speaker