HANNspree 1E03-37GT Service Manual page 12

AV Input Circuit(Audio): (AV,S,SCART)
• Tuner output SIF to U15 MS3410G.This audio signal will be decoded into
SAP,STEREO,MONO.
• R/L audio signal of AV,S,SCART2,PC switches in U2 AN15857.
• R/L audio signal of DVBT(only digital system),YUV,DVI1,DVI2 switches in U9 BU4052
then transmits into U2 AN15857
• Audio signal of HDMI 1,HDMI 2 which comprise in LVDS transmits to U12(S4334)via U11
SII9023and switches digital signal into analog R/L signal(DAC).
• ALL R/L audio signal input to U15 ,then audio quality process amplity audio signal
procddure in U18 TAA2008 Class T into 10W+10W.
• U18 Class-T is audio AMP the amplifition of efficiency upto 85%.
.
CPU circuit
• U1 PW106B is 80186CPU, it's main CPU of system.
• U25 is 16Mbit Flash Rom. Boot code and Appcode are store in U25. The program came
be upgraded via VGA jack.
• U21 is 64Kbits EEPROM and allow repeat record 100000 times. Main function is store
the adjustment record of machine and menu setting record.
• U27, U28 are 128Mbit SDRAM.Main function is store DATA.EX. Deinterlace, 3DComb
scaler.
• CPU control flow path:
a:CPU reading the program of U25 Flash Rom after turn on the machine.
b:CPU setting register record of IC to be the unoffical decision record of system program.
c:CPU link up with IC (tuner)
d:Light up the Inverter when each IC execute normally.
e:System will store menu upgrade record and statu record into U21EEPROM and U27,U28
SDRAM.
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