I have a nice JVC LT-40C750 smart TV with an annoying fault.
The TV works great for anything between 5 to 30 minutes then the backlights will suddenly go off. Sound still works and you can see image with a flashlight.
When it happens, you can switch to standby then back on again and it works great again for another while.
Power board is a 17IPS71 and main board is 17MB95M.
Heating or freezing the board doesn't have any effect, same with tapping the boards and wiggling the backlight connector.
There's 3 wires go to the backlights. When working there is 68v between black wire and chassis, 5v on brown and 7.8v on red. When the backlights go off I have 0v on black, 2v on brown and 2v on red.
Can anyone offer any guidance? I'll add pics of the boards shortly.
Many thanks.
The TV works great for anything between 5 to 30 minutes then the backlights will suddenly go off. Sound still works and you can see image with a flashlight.
When it happens, you can switch to standby then back on again and it works great again for another while.
Power board is a 17IPS71 and main board is 17MB95M.
Heating or freezing the board doesn't have any effect, same with tapping the boards and wiggling the backlight connector.
There's 3 wires go to the backlights. When working there is 68v between black wire and chassis, 5v on brown and 7.8v on red. When the backlights go off I have 0v on black, 2v on brown and 2v on red.
Can anyone offer any guidance? I'll add pics of the boards shortly.
Many thanks.
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