First of all you should weight the cost benefit of repairing the set versus purchasing a new one.
\015\012Depending on the size and model of tv, it may be more prudent to simply cut your losses and buy a new tv rather than spend money swapping out circuit boards in the hopes of repairing a set in questionable condition already. Main / Power Supply / LCD Controller boards will typically run you about $100 each to replace, so weight that against the purchase price of a new tv that comes with a warranty.
\015\012Given that, if you are still intent on trying to repair the tv, and it does since you have gone out and acquired a service manual, there are steps you can take.
\015\012First of all the service manual should give you some idea what the blink pattern means on the front panel lights. Look that up first.
\015\012It does sound power supply board related, but bad capacitors are not always as obvious as the tell-tale bulging or gunk-leaking ones.
\015\012Use the manual to find out what voltages you should be getting out of which wires coming off the power supply board. In general, some will be 5VDC, some will be 12VDC, and some will be 24VDC. Test them with a multimeter and see if you are missing any.
\015\012Obviously this test requires you to have the unit plugged in and powered up with the safety covers removed. I cannot stress enough the potential dangers involved and if you are not confident with that level of maintenance, I would recommend you leave the live power tests to the trained technicians.
\015\012You said you didn't see any bad capacitors, so you may want to just unclip, pull out and then reseat all the multi-wire connector you can get to in case one of them just has a bad connection.
\015\012Good luck in the troubleshooting.
\015\012If you have any questions or require any further assistance please comment back on this page and I will do my best help you. Please provide the model number of your tv next time as well.
\015\012If this was at all helpful, please click on the 4 Thumbs Up rating icon above.
\015\012Thank you very much.
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