My T.V. powers up, but sometimes there is no picture, not even snow. Sometimes i power it up and the picture comes on right away, other times it takes several minutes for the picture to come up. Also, sometimes i turn on the T.V. and the picture never comes on.
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Re: GE 27GT722 Picture problem
Regarless of the reason I will give you ,call a service tech for an estimate since is the safe way to correct the problem.
First when you loose the pix put your forearm in the face of picture tube and if the hair in your arm stands up is a good sign because you are not loosing high voltage to the picture tube but if the hair does not stand up it means the crt looses high voltage and for that you need a service tech to troubleshoot.The other reason might not be as expensive If you have high voltage by doing the previus test it might just be a loose conection in the crt board.Do not remove the back cover unless you know what are you doing.Is not safe.
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Fault to the main power supply regulator board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Contact any service technician. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electronicshelponline.blogspot.com/ It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
if the sound goes out its not a tube problem . a bad tube would have no effect on the sound .you problem (my guess) is in the power supply . a modern tv power supply has parts of it that stay on all the time unpluging it is not the problem its when you plug it in ! the power supply gets a JOLT . you might get away with it ,you might not . thats why we install surge arrestors on power plugs and with expensive tvs i recomend a UPS a power unit that keeps the tv powered even wnen the line power is out . thats keeps everthing in the sets nice and even ,so the tv lasts longer ... a modern tv turned off uses about 1.40 in electric a YEAR in standby mode , so what are you saveing if you send you set to the landfill early and have to buy a new one ? over 1.40 in electric ? . turn down you water heater or something else simple dont be blowing out you electronics for the sake of a few cents ..... good luck .... if this answer helped please rate a 3 or 4 , this high rateing will hepl keep me in the paid answer department . thank you
This should be a quick fix. Try resoldering the vertical IC. This is a small flat IC attached to a heat sink with about 11 pins. It should be marked LA7837 or something similar. That should resolve the problem.
1)possible bad RF modulator (the small box the
A or B signal first goes thru)
2)Bad tuner (mounted on signal board)
3)or missing voltage to run tuner
You could replace signal PCB,but that gets a little pricey.