ViewSonic N3260w-1NT Service Manual page 15

AV Input Circuit(Audio):
• AV Audio input signal includes:AV(1,2)、S(1,2)、HDTV(1,2)、PC、TV、HDMI
• AV 1(S1),AV2(S2) Audio R/L Signals input respectively U4 MM1631 Audio Switch PIN35,36/PIN33,34 to
switch with other audio input source than output from U4 29,30 via Q25,Q26 Audio Buffer and input U49 SRS
TA2136F PIN1,2 to process SRS processing then output from PIN11,12.Input U39AN5891K PIN3,22 for sound
effect working .
• U39AN5891K PIN 12,13 output earphone signal and variable audio voice .Earphone signal trainsmits to U57
TDA1308T AMP to amplify earphone volum .
• HDTV (Y/Pb/Pr) left and right audio signals input repectively U4 MM1631 Audio Switch PIN1,2/3,4
• PC(VGA) left and right audio signals input to U22 MM1631 Audio Switch PIN 7,8 .
• HDMI Audio :
• Digital Audio signal :Via U53 Sil9011 Digital Vedio Decode decoded into I2s digital audio signal and via
U56 CS4334 D/A translate into analog audio signal than input U4 MM1631 Audio Switch PIN9,10.
• Analog Audio signal :input U4 MM1631 Audio Switch PIN 11,12.
• Digital /Analog Audio signal switch by OSD memu.
• After R/L audio signals switching (include AV,S,HDTV ,PC ,TV and HDMI ),All signals output from U39 AN5891
PIN12,13 and trainsmit to U17 TPA3004 amplify and output.
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N3260w_N3760w_N4060w
-1NT
N3260wb_N3760wb