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Hitachi CEP-321D TV screen only a bright line fault repair method
Time£º2014-07-24 08:49:02  Source£ºNetwork  Author£ºUnknown  Clicks£º1177
  

(1) the multimeter to measure IC681 attending foot voltage 0.5 V, normal, using the oscilloscope to observe the feet, no stimulation waveform, suggests that fault. IC681 10 feet before a push or oscillating circuit. 4WFservice manual download site
 4WFservice manual download site
(2) measuring IC701 12 feet voltage of 10.3 V, the power supply voltage is normal. Check the oscillator R602 peripheral component, R603, C604, are no exception. Doubt is IC701 internal damage. 4WFservice manual download site
(4) new LA7801 scanning, machine back to normal. 4WFservice manual download site
(5) under the condition of no oscilloscope, also can use multimeter dB gear measuring IC701 attending foot presence of ac voltage, to determine whether to start up.4WFservice manual download site
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