I think the fuse is blown, but it is in such an awkward place that it is hard to see visually. Either way, replacing it thru the power cord access would require the manual dexterity of ... well, I'm not sure it could be done.
So, other than "remove the screws that secure the back," does anyone have experience removing the back cover?
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Re: How to Remove the Back Cover to Replace the Fuse
Unscrew all the back black screws and gently pull the back off.
if a fuse is blown, you most likely have a severe power supply issue.usually the str would be shorted , a bridge rectifier wil also do this, a faulty ptc will blow a fuse also.
check how the fuse blew, if it looks violent then you have a short.
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Hello Check the power supply regulator board inside. It has a fuse [ a glass cartridge type, replacable] on it. Check it for blown out. If found blown up, replace the fuse with same size and ratings. its ratings will be marked on it. If the newly inserted fuse blows off too, as soon as you switch the Set ON, never replace an other one in place, as it will damage more components. make sure that the present power baord has some shorted component/s on it. It will be best to replace power regualtor boards as card basis, as components on it will be very hard to get from electonic spare part selling shops.
Open the back cover of the monitor.. check the fuse at the power supply board... If the fuse is open, replace with same value.. at the power supply board check for any blown capacitor and replace it with same value. Check also the power cord for open connection.
The main a/c fuse is likely blown -6.3A 250VAC- Replace with a 7A 250VAC.
To replace - remove back cover - once removed follow a/c cord to TV and fuse is on the board close by. google "GMA fuse" images to see what fuse looks like -the one without leads -clip in type.
The main power fuse inside the TV may have blown. The rear cover must be removed to check it. Unplugging the power cord from the wall outlet is the first safety item. Finding all the right screws to remove the cover (without taking out some you shouldn't) is sometimes tricky. When you remove the cover the power cord will still be attached inside, so remove the cover carefully. There is a danger of touching residual high voltage near the picture tube. Carefully look for a fuse near where the power cord attaches to the circuit boards. Often the fuse will be obviously burned open (the small conductor inside the clear glass is melted or the glass is blackened). Replace only with a fuse of the same type and amp rating. Putting a higher amp rating fuse or slower acting fuse can have costly and possibly dangerous consequences. Be sure to plug the power cord in when you do your test with the new fuse. If you haven't done anything close to this before, you may want to refer this job to an expert.
I had the same problem. 45karats had the answer. It was the fuse and its replacement fixed the problem. You need to get to the back of the set (moving it away from the corner wall was no mean feat; this is the heaviest set I ever owned) and remove all the screws holding the back onto the chassis. Slide the back off slightly, maybe six inches (pry around the edges evenly) and you will be able to see the small fuse attached horizontally next to where the power cord attaches. CAUTION! There are several wires and circuit boards that move with the back of the set. Don't pull it back too far, but just enough to find and remove/replace the fuse. 6.3amp slo-blow fuse is what I used. Also DO NOT DEPRESS THE BUTTONS, LIKE THE POWER BUTTON, ON THE FRONT OF THE SET UNTIL YOU GET THE BACK COMPLETELY AND FIRMLY BACK INTO PLACE. I tried to test the set to see if it would come on before I had the back completely back on and the Power button went inside the cabinet! I had a hell of a time reaching in and prying it back through its slot in the front of the set. It is a simple plastic button that actuates the power switch, but only AFTER the back is in place. The switch moves with the cabinet so there is no resistance to the button until the back is fixed in place. I got the fuse at Radio Shack. Note the fuses they sell are 6.3 amp and 250v rated, vs. 125v that I took out of the set. I don't think the voltage rating is important but I could be wrong. It is the amp rating that is important. All I know is it works and I am relieved about that.
Could be a blown fuse inside. You can check this yourself if you are comfortable doing so. Remove the screws around the back edge of the set and remove the cover. Look around on the circuit board close to where the cord connects to it. You should see a small glass fuse. Use a pen or small screwdriver to pry it out. If you see any black inside, it's probably blown. This can happen for any number of reasons and doesn't necessarily mean that there's a problem. In this case, examine the shiny end caps for a number followed by the the letter 'A'. This is the current rating of the fuse. (ex., 3A means a 3 amp fuse). Get one at Radio Shack or other electronics store, replace it and try it out.
If the fuse is good, you will see a tiny wire running straight through the center. If it's good, then there's something else wrong that will require a professional.
Hope this helps, and please rate my advice, good OR bad.
If you do not get any clicking or sound when trying to turn on the TV set, most likely the main fuse went out. This is almost always due to something else blowing out along or making the fuse to blow out. DO NOT SIMPLY REPLCE THE BLOWN FUSE! If there is other shorts inside the set, and you replace the blown fuse, you can cause more damage to the TV set. The best way to test this set if the fuse is blown would be to hook up a 100 to 150 watt light bulb across the blown fuse, and if there is a short in the TV set the light bulb will glow bright and stay bright. If the bulb lights up and goes dim maybe just maybe you got luck so replace the fuse and see what happens. If the light bulkb stays bright, there is a short in the set somewhere and if you do not have a service manual and a good multimeter and a knowledge of how the TV power supply works, you really should call in a pro to assist you in the repair of this TV. there is just too much High Voltage inside these TV sets to be experieenting around inside of it. Good Luck.
check the main fuse in the tv. test it with a multimeter, not visually. if its the thermistor that blew the fuse, it is very difficult to see the break in the wire. replace if blown. if unit blown fuse again withing a couple of weeks replace the thermistor in the degausing circuit.