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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.
hi I have a JMB LCD TV MODEL 42883which has only worked for one week b4 the screen was cracked by accident everything else is perfect.would solve one of your problems your having with your tv.will sell it at reasonable price.07719651554 if interestd
Hi,all the tack swicth of your front panel tv is defective ,because as you said when you change the volume sometimes is turns off meaning you have coroded swicth that makes your system control IC of your tv malfunction when you touch the button,in this case you may need tv technician to repair it.
try removing the batteries and press every button. INstall a fresh set of battereis and give it a try. If the remote still fails to operate contact www.remotes.com
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