Question about AcerView 78ie 17" CRT Monitor
MONITOR REPAIR HELP Hi I would like to appreciate for your help I have got an Acer monitor model G781 CRT Type its switching power supply is not starting 300 volt supply is ok , Q602 (2SK1940 )& ic 601 (UC3842)have been changed with new one, voltage on pin 7 of ic601 is 12-15 volt(flactuating in between ) it should be 16 volt to generate Vref (5volt)on pin 8 of ic601 to start?!capacitor c626 have been replaced , but still does not start!& the fault is still unknowen ! Your help will be usefull.
Have you checked the horizontal output transistor for a short or leakage?? most of these sets will not start up unless the horizontal sweep sends the pulse to the power supply and says start me up!! I would look at bthe drive as well on the horiz. curcuit. If theres a pulsating voltage that means its waiting for something to signal it to work or its missing something.. Good luck
Posted on Apr 23, 2006
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