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Hitachi CM2518C color TV power supply, the power indicator light, then go out and then bright, go round and begin again repair method of fault
Time£º2014-07-30 09:07:16  Source£ºNetwork  Author£ºUnknown  Clicks£º1246
  

Hitachi CM2518C color TV, connected to the power, the power indicator, then put out, then bright, and the process continues. Yhqservice manual download site
 Yhqservice manual download site
Temporary unplug the power and load, the connector between the measured voltage fluctuations between 37 ~ 110 v + B, shows faults in the power supply circuit. Measuring Q902 b voltage its fluctuations between 0-0.6 V. At this point, the fault compression in the overload switch power supply circuit. This machine overload switch power supply circuit consists of Q902, ZD901, Q903, etc. When the switch tube through the flow or the heavy load falling + B voltage, anode potential ZD902 rise, Q903 cut-off, ZD901 cathode potential rise, when ZD901 cathode potential is greater than the ZD901 voltage value, the ZD901 conduction, Q902 conduction, IC901 (TDA4601) (1) feet of nipple. Switching power supply at this time he stopped oscillation, played a protective role. Check the protection circuit component, found a slight ZD901 breakdown phenomenon. Replace ZD901 (RD2. OEB1, 2. OV regulator tube), troubleshooting.Yhqservice manual download site
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