Question about Sampo AlphaScan 411 Monitor

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Please help me.

Hi ,good day...can you help about the problem in a "sampo monitor alpha scan 411" the problem is,the monitor has a power,,but there is no display,the output has a black screen.and no high voltage in the monitor screen f i touch it..what is the possible problem on it..can you help me to troubleshoot that problem?what are the parts i need to check on the board in monitor..please help me...

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Checked the horizontal output,a big transistor near the flyback trnsformer, if it is shorted replace it,,,,

Posted on Feb 16, 2008

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Check the B+ about 115vdc.Check collector voltage of horizontal output transistor.If there is voltage over 115vdc from B+ and H-out collector voltage, there should be little light produce on the screen.If not , measure the supply voltage of the heater-from CRT.If there is voltage supply at least 4vdc, then check the switching transistor near flyback. FET or MOSFET transistor for shortage or no supply in triggering gate terminal lead.If not resoldering the IC in the CRT board or any other probable parts .The last I think, check the resistance of the heater CRT pins.If no resistance reading , then your crt tube is deffective. The last is the so-called jungle IC that many video problems comes out.Try to resolder the IC pins.Check the transistor that surrounds the IC. Sometimes If test the transistor , there is no shortage and no leakage, but it don't oscillate. Therefore no video display.

Posted on May 11, 2008

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