You haven't told us the exact model of your tv so i can't be very precise.
On older tv's the blink signals that the power source is in protected mode because there's a short on one of its output lines - use a voltmeter to find out which output line is down then test all components / boards that this line powers until you find the shorted one.
On newer tv's that blinking signals the fact that the processor of the tv has been unable to load the firmware - something is wrong in the mainboard of the tv. Again you must test it - if the voltages at the processor are ok then the defect is in it. In that case you must replace the mainboard.
This is an older model, in which have been used low quality components - it has been so bad that HP went out of the tv business a year after it. The electrolytic capacitors are especially infamous - if you decide to keep it you will gonna have to replace all of them, and they are over 50 in the entire tv.
Start testing the power source first; once you fix it be sure you are going to find another failures on the inverter board and the t-con board so fix them also.
In the end test the mainboard, there's a good chance that the processor has been fried by the failing power source.
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SOURCE: How do I access the circuit board on the Apex LD1919?
All the components are screwed to the back of the cabinet. Once the back screws are removed, the front bezel snaps off. (Not easily, but take courage and try.) Release a connector in a set of leads to the pilot light panel to get enough slack to lay the bezel flat. The LCD panel then removes with seven silver screws (one is a ground lead). Move it to the side, and the power supply board is accessible. Two connectors and four screws, and it comes out.
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The model is hp lc3760n, so please provide specific if you can.
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