Sanyo LCD-20XR1/AU Service Manual

Contents

2. With picture and without sound when turning on:3. When receiving TV signal, there is no picture or dark snow:Confirm the +5V, +32V power supply of TUNER, confirm +5V, +9V power supply of IF amplifier is normal.If they are normal, check whether peripheral circuit of the TUNER or IF amplifier is normal. If they are allno problem, then 8125 or its input signal is abnormal.4. In TV channel, the picture or sound is abnormal; the frequency of the menu is different from the actualfrequency.Connect the signal cable; manually adjust the frequency to conform to the actual frequency. Enter intoservice menu; check AFT value should be about 1.6V. If the difference is serious (the difference is largerthan 0.4V), open the cabinet and adjust the transformer until the value of AFT is 1.6V.Increase the volume;check whether everychannel has no soundCheck if the no sound channel from the signalinput to sound processing IC IC15900 is normalCheck whether the signaloutput by 15900(IC) isnormal15900(IC) or peripheral circuitdoes not work normallySound amplifier orperipheral circuit doesnot work normallyNYYN19TROUBLESHOOTING CHARTS