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Sharp QA-1650 Service Manual
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LCD Display Failure Check.Input a digital video signal.(CGA, 14.318MHz)NOFailure of OCS1.Is there a clock pulse of approx.18.432MHz generated at IC1-177YESIs there a clock pulse of approx. YES14.318MHz generated at !C30-87Are signals at IC1-84,86,and 87 normal?L7{e|Is Hsync input to 1C1-26and Vsync to 1C1-25?Disconnect the panel.YESYESFailure of Hsync or Veyne inputcircuit or signal cable failure.NO. Are signals atiC1-84,86,and 87 normal?Is input signal to IC 1-25and output signal from 1C1-11have the same frequency?YESFailure of panel.Failure of (C1.Is frequency 61.326MHzon IC1-9 ?YESNOFailure of video inut circuit.Are proper signal inputtedto 1C34,35,36-3-1071s the output from 1C1-8and IC1-10 high? YESAbnormal display.Failure of IC,1,2,3,4,5,8,9Failure of C1 and Its P.W.B.pattern open or short,soldering.peripheral circuits.YESIs the output from1C1-7 high?Are the proper signal inputto IC1-2-5, 156-1597Failure of signal lineYES between ICt and 1C2.Is IC2-11 at a high leveland IC2-10 at a low level?ES Go to MPU Check.VCD circuit failure orpattem failure.44 |
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