Hitachi CMT2598 color TV standby ten minutes or tens of minutes automatic shutdown failure repair method |
| Time£º2014-07-28 11:08:46 Source£ºNetwork Author£ºUnknown Clicks£º1485 |
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8yPservice manual download site
8yPservice manual download site
Sound, determine the cause of the problem may be in the oscillation circuit. 8yPservice manual download site
8yPservice manual download site
The machine of line oscillation circuit is simpler, by video and scanning circuit IC5001 (YAT018) (28) foot external crystals X701 (CSB500F25) with the internal oscillation circuit is completed, then the line scan pulse frequency. 8yPservice manual download site
8yPservice manual download site
After replacing a CSB500F25 crystals, grating, but the images still out of sync, light is put out a few minutes later, again "3 without"; Detect IC5001 peripheral components related to the line of oscillation frequency are no exception, had to change again CSB500F25 crystals, after the change to the third little CSB500F25, finally restored image synchronization. 8yPservice manual download site
8yPservice manual download site
Summary: the failure is due to the uncertain CSB500F25 heated frequency crystal caused line output frequency change, not only out of sync, line output transformer inside a "squeak" cries, and the line output current and the change of the output pulse amplitude, the SCR Q799l into protection state.8yPservice manual download site
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