There are two versions of the power supply/inverter PCB assembly, you need to look inside to see if it has any bad caps with bulging tops first, then post back so we can guide you further.
http://lcdrepair.us/1504fp-inverter-power.html
http://lcdrepair.us/1504fp-power.html
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hi, sorry to jump in(new here) i have the same monitor with the same fault.. all the components look fine inside, what would be the next step to check,
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