TV Repair Questions? Ask a TV Technician
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This indicates that the power board is not powering up at all. The quick fix is that it could be simply that the fuse is blown. To access the fuse, you will need to remove the screws on the rear of the TV and remove the entire rear panel. The fuse will be located on the board where the power cord connects. Replace with one of the same type and rating from your local Hardware store.
If the set still does not power on, I would say that there is a cold solder-joint, or a failed component (likely the capacitors) on the power supply board. The capacitors failing is the MOST common problem with these sets, especially after a storm or power outage. The caps themselves can be replaced for around $150 parts and labor.
If another board had an issue, then the TV's power light would be on or flashing.
Do you have any prior experience testing voltages on live circuits, or soldering?
If not then, locating the solder joint, or failed circuit could take several hours of a Technician's time, and would require someone that knows electronics on a circuit board level.
There is no button to push to make the set work again. It would definitely require component repair/replacement.
An estimated cost to replace the entire power board (worst case scenario), would be approximately $300 parts and labor.
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The fuse could be either a white ceramic, or glass fuse. Solder in and snap in types are both used regularly.
Use a multimeter with one probe on each metal end of the fuse. Set the meter for OHMS, or "continuity" and it will beep, or show "O" ohms if the fuse is good. If it's bad, you will get no beep, or a fluctuating ohms reading that never settles into place.
The first thing you'd want to check is the caps on the power board for bulges or leaking. Any of these needs to be replaced.
Please only proceed if you have experience measuring live voltages on a circuit board level.
Next, use a DMM set to DC volts, find a common ground on the power supply and probe all of the Outputs for voltage (correct voltages will be stamped on the power supply at the outputs). Do this with NOTHING connected to the Power supply but AC power. If a voltage is missing/ fluctuating, then the power board needs to be replaced.
If the power supply outputs its rated voltages, then connect the other boards one at a time until one causes it to shut down. This board would have the short causing the supply to SOS, and would need to be replaced.
A good source to locate replacement boards is http://www.shopjimmy.com/ and http://www.discountmerchant.com/