Question about AcerView 78ie 17" CRT Monitor

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Help on monitor repair

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.

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  • ALI HEYDARI
    ALI HEYDARI Apr 17, 2006

    HELP REQUIRED !

  • ALI HEYDARI
    ALI HEYDARI Jun 26, 2006

    Checked output circuitry for short , there was no short .
    As the primary & secondary circuit were checked for active components & suspecxted passive components,this time cheked the passive components very precisely & find out the R627 a 10K ohm resistor , in one end is 10k & the other end is infinity !
    So replaced R627 , & the system is started .
    After replacing IC101 ,Q102 , ZD602 , The finnal component to replace was R627 which is replaced & SMPS started .the finnal check was OK . GOOD LOCK

  • ALI HEYDARI
    ALI HEYDARI Jun 26, 2006

    Checked output circuitry for short , there was no short .
    As the primary & secondary circuit were checked for active components & suspecxted passive components,this time cheked the passive components very precisely & find out the R627 a 10K ohm resistor , in one end is 10k & the other end is infinity !
    So replaced R627 , & the system is started .
    After replacing IC101 ,Q102 , ZD602 , The finnal component to replace was R627 which is replaced & SMPS started .the finnal check was OK . GOOD LOCK

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  • 3,130 Answers

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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Posted on Jan 02, 2017

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The mains switch is a weak link on these, check this first. Also 1 of 2 33K 2W startup resistors in PSU goes o/c, check with DVM or if you have very high volts on main primary res cap this usually indicates a 33K has gone - change both. I've also had a small TO92 transistor hanging off the UC3842 failing causing no startup. A s/c HOT normally causes a blinking LED. note that AC cap IS charged, DISCHARGE BEFORE WORKING ON IT! Did you check for shorts in the secondary side of the p/s, horiz output? If there are none , look for the switching regulator. Check the support components. I've seen these with open solder connections on the coils in the PS due to that abominable glue they use...you'll see signs of burning/arcing on the inside of the cabinet, too. Good luck

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