Question about Samsung SyncMaster 551 15" CRT Monitor

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Samsung 15' sync master monitor

Before 2 weeks the monitor was working but the brightness/ contrast was low not able to see anything when it is switched on . but gets brighter and fine over a period of 30-40 minutes .
Yesterday, only the led was on ( status was not blinking 0 .but no display . iwaited for 5 minutes . but there was no response .suddenly i heard a tac sound and the led was also went off.
pls guide me . so that i can change the parts .

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