Samsung TXT3093WHX Service Manual page 82

3. MST3387 Diagnosis
Component 1/2, and HDMI signals are input and the selected signal is output through MST3387.
If the signal input and output are not detected, check the following.
- Supplied Power: 2.5V, 3.3V
- Input Trouble Check: Check the jack and input pin.
- Output Trouble Check: Check DIC7010 and the output pin.
(Check the square wave signal through digital output.)
Samsung Electronics
Troubleshooting
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