My tv went black but has sound what’s wrong
I have the same problem with a Philips TV, less than 12 months old. It has no on/off switch, only a remote When I switch it on from standby, the Philips icon comes on at normal brightness, then the screen goes black. That suggests to me that a setting is responsible. The Settings menu is not visible, and I can’t see an obvious brightness control. The flashlight test, with new batteries, is negative.
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