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Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts. http://electro-medical.blogspot.com/ http://electronicshelponline.blogspot.com/
In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.
1. Turn on your TV and the FiOS STB. Make sure you can see live television. 2. Locate the 3-digit code for your TV brand in the list below and circle the correct code. If your TV brand is not listed, codes for additional TV brands are listed at the back of this manual. 3. Once you locate the brand code, press and hold the <OK> and keys together. The RED LED on the remote control will blink twice and then stay on. 4. Enter the 3-digit TV code for your TV brand using the number pad. The RED LED will blink twice and then stay on. 5. Press and release the <CH +> button repeatedly until the TV turns off. You can also "back up" by pressing the <CH -> button. *Please note - some TVs may respond slower than others. Please allow 1 second between button presses. 6. Test that remote control is programmed for your TV a. Turn the TV on using the key. b. Press <VOL +> and <VOL -> to make sure that the volume keys work. c. Press and keys. d. If any of these keys do not work as expected, press and hold that key. Release it as soon as it works. 7. If all these keys work, press <OK> to save this TV brand code programming. The RED LED will blink 3 times and then turn off Your Remote Control is now programmed for your TV!
replace the power suply unit the 5v stand by is not working
if youhave good hands buy a 5 volt power supply and connect it to the same output (but remember to remove the transformer for that power )
check it with a dvm
hope i helped