Do you know ic datasheets

ic datasheets

The complaint for this Samsung 510BN LCD monitor was no power, after the cover was opened I found that the power filter capacitor still hold some charge and the voltage was quite high. A shorted power ic this monitor is using the 4 pins 5L0365R power ic in the primary section or a shorted diode in the secondary section would pull down the flyback tester LED bar to the minimum. If the flyback tester LED have 8 full bars, this means that the components such as power ic power fet if have , power transformer primary winding and all the secondary diodes are not shorted. In this Samsung 510bn LCD monitor power supply, the caused of the no power and filter capacitor take longer time to discharge was due to a shorted secondary diode which is from the schottky type with the part number of SB5H100. Of course there are many more methods to locate the shorted secondary diode such as directly test the diodes, but this method can check for components shorted even without touching the soldering gun.
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