7-3
2.4 Reset
U405 pin17: reset signal for scaling IC. U406 provides reset signal.
2.5 LED Control
U405 pin 41: control Q404 for LED (GREEN)
U405 pin 25: control Q406 for LED (ORANGE)
LED(GREEN) is synchronized with the back light control, PBIAS.
2.6 AUDIO Control
U405 pin24: control U501 for Audio Volume.
U405 pin18: control U501 for STBY.
U405 pin19: control U501 for MUTE.
3. Memory
Flash Memory IC (U407) stores firmware
4. Sync Interface
U402 is schmitt trigger input IC, and it provides H and V sync to U405.
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