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NO SOUND
There is no sound output in the USB FUNCTION, repair the set according to the following guide.
5-2. IN THE USB FUNCTION
5-2-1. Solution
Please check and replace IC800 on MAIN board and DISPLAY board.
5-2-2. How to troubleshoot (Countermeasure)
1) Check +5V_USB to DISPLAY board.
- If the USB LED are turned on, the voltage is okay, if so not, check +5 V to pin4 of CON301.
2) Check USB D+,- from MAIN board to DISPLAY board.
a. Check USB± signals to CON301 (pin20, 21).
- If there is any trouble, check the power for each IC.
The power is normal but, if the signal waveform to the IC is distorted or no signal, replace it with a
new one.
3) Check if "Digital audio AMP block" on item 5-1 is normal.
5-2-3. Service hint (Any picture/ Remark)
< MAIN board top view >
ONE POINT REPAIR GUIDE
FB408, FB409
FB408, FB409
3-10
< Waveform of USB D± signal >
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