Sanyo LCD-22XR7SN Service Manual

Contents

12Working principle analysis of the unitThe RF signal received by antenna will be sent to tuner TUNER101, then IF signal will beobtained through high amplifier and mixed frequency, through pre-intermediate amplified by V101,then it will be sent to acoustic surface-wave Z102 to do IF filter and get better IF characteristics,then it will be sent to N101 (R2S10401) to do intermediate amplification, phase-locked loop VCOand synchronous wave detection to get composite video signal TV-VIDEO; after pre-intermediateamplification IF will also be sent to acoustic surface-wave Z101 to do filter at the same time, then itwill be sent to N101 to do intermediate amplification and output the second sound intermediatefrequency signal (TV-SIF).The TV-VIDEO signal output from R2S10401 together with TV-SIF will be sent to main IC NS2(MST9U19A). Video signals of AV1, AV2, S-VIDEO and YPbPr will be sent to MST9U19A, andtheir audio signals will also be sent to MST9U19A (AV1 and YPbPr share one group of audio ports,AV2 and S-VIDEO share one group of audio ports). The video and audio signals of VGA and HDMIwill be sent to MST9U19A, too.The main IC NS2(MST9U19A) is a high performance and fully integrated IC, which can realizeHDMI processing, video demodulating, video switch selection, A/D and D/A conversion,interlace/de-interlace processing, modes conversion, OSD and low-voltage differential output, ect.And it also has functions of audio selection, processing and MCU.The video signal via MST9U19A processing, output 4 pairs differential signal and 1 pair clocksignal for PDP panel display. AV1, AV2, S-VIDEO and video signal of TV via selecting andprocessing, then output AV-OUT signal to double amplifying, then it will be sent to AV-OUT.Audio signal via MST9U19A processing, one way will be sent to sound amplifier NV4(R2S15102) amplifying to speaker. The other way via NV3(LM358) amplifying, then sent to AV-OUT.WorW king pr ncipple a a ysis of the unitA dio signnal vviaia MSTT9UU19A 44V4Nerplifimpandountontensbellwiwiywaong, o