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Main IC uses enable control signals such as POWER_ON, LVDS_PWR_EN, BL_EN and MUTE
to control MOS and switch IC to insure Main board work normal. The definition of each enable
signal.
1.POWER_ON： Power supply for start up. And control QA05 and U5 to break off after power on.
Supply power for DDR, FLASH and TUNER.
2.LVDS_PWR_EN：Power supply for panel enables. Control F04 to supply power for OPEN CELL
singly.
3.BL_EN：BL on/off Enable. Control BL driver IC to supply the rise voltage impulse.
4.MUTE：Mute function, control UA1's work state.
When POWER_ON is in effect, the input of +5V_NOR can be tested from UA01 and UA02.
The +5V_NOR1 can be tested from UK02. 3.3V work voltage is received by TU1, FLASH and UK03.
1.5Vwork voltage is received by U1 and DDR.
The comparison fig of standby power supply
Service manual of MT31AS
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