Panasonic 2185 color TV sets to watch in the process of grating, the sound suddenly trouble-free maintenance method |
| Time£º2014-06-04 07:24:00 Source£ºNetwork Author£ºUnknown Clicks£º1290 |
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Jmtservice manual download site
Considering the tandem switch regulated power supply have increased slightly after joining line flyback pulse output voltage, higher power supply voltage is 113 v after SCR Q834 (TFD312M) protection by mistake? Try to get off Q834, to be on the safe side, on the 113 v power supply and a R2M protection diode boot instantaneously, hear have a discharge tube high pressure cap, switch transformer continuously from the original chirp immediately turned into a continuous "chirp" sound, immediately shut down, this suggests that the main power supply output voltage is too high. Inspection found that the manager has breakdown, D805, R805 and R806 normal, try to D805 disconnect, fitted with the new manager of commissioning, the TV sound figure is normal, just switch transformer issued a "creak" sound (not with horizontal frequency synchronization), check IC801 (STR50213) peripheral elements are no exception, judge IC801 performance variation, change after working for more than a year, everything was normal.Jmtservice manual download site
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