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CRT color moitor

Monitor had no vertical deflection.I replaced the v/ic problem was solved.Now monitor is working ,but making a terrable loud high pitch sound,and also the screen appears to be green of color

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The "terrable loud high pitch sound" could be the horz. oscillator.
The voltages off the crt should be (+) (-) 11v to 15v DC. Too much on Blue & Red guns will cut them off

Posted on Jun 22, 2008

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Tip

Quick things to check on tv's and, monitors


remove power; remove the cover: with a multimeter on "ohms" check the fuses they will be identified on the circuit boards as: F-1, F-2 etc. look over the circuit board for burned resistors and, other components i.e. leaking "domed" capacitors, next: repower safely then: using component coolant from radioshack cool the i.c.'s as you stand behind the tv / monitor while watching the monitor using a mirror to see the monitor screen (do not touch the open monitor case.) if one i.c. suddenly makes the unit work: heat it with a hairdryer on "warm" to duplicate the failure before you replace the faulty component.

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1 Answer

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1 Answer

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The LA78041 IC has failed. I replaced it twice before I cleaned the high voltage connection to the CRT. It was very cruddy from cigarette smoke. A high voltage discharge to the yoke takes out this IC. They are available for under $4.00 Good luck.
from Lincoln Hubbard at lwhubbard@cox.net

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1 Answer

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If the IC is running hot, you probably have some bad caps in the circuit. Be sure to have a good capacitor checker that also tests for ESR. Also recheck your soldering work with a magnifying glass. The traces are so fine that it is easy to damage them.

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1 Answer

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Witch part of the screen you loose?if is the bottom or the top it could be a problem in the vertical IC circuit if is the left side or the right side is a problem on the horizontal deflection circuit(very rare),try taping on the set when it does it and see if the pix reacts ,if it does one way or the other you have loose conections and some resoldering need to be done.If you are familiar with tv circuitry you will have no problem.If you are not be safe and call for help.

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