TV has black screen but has sound. Works after months unplugged

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Hitachi Television

Guides and repair information for televisions from Hitachi, a Japanese electronics manufacturer.

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emma.brady12 @emmabrady12

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发帖于: 2021年12月7日

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TV has black screen but has sound. Works after months unplugged

Hitachi TV, can hear sound from it.

Have tried unplugging from wall and leaving for an hour.
Tried plugging directly into wall
Tried holding down power button for 30 seconds then plugging everything back in
Red light blinks when plugged in, but when you try and turn it on light disappears and no screen change
Shone light against screen to see if a back-light issue (it's not)
Tried unplugging the HDMI cables that were in and using different ones

Honestly we gave up and left it for a couple months. On a whim we plugged it back in and… It worked??? Was good for a couple weeks but today tried to turn it on and it's dead again.

The fact it came back to life after months is baffling to me. Any ideas what would cause this?

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How old is this TV? Can you post pictures of the boards in the TV? 在已经存在的问题里加入图片

由 Andrew S 完成的 2021年12月7日

It's nearly 3 years old. But still very confused what component could fail and months later work again

由 emma.brady12 完成的 2021年12月7日

@emma.brady12 Can you upload pictures of the boards?

由 Andrew S 完成的 2021年12月7日

emma.brady12 what exact model is your Hitachi TV? Wile your TV has sound and no picture, in a darkened room shine a flashlight beam at an angle against the screen. See if you can make out shapes or silhouettes. This will not work on Plasma TV's etc. so we need to know the model for sure.

由 oldturkey03 完成的 2021年12月7日

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How old is this TV? Can you post pictures of the boards in the TV? 在已经存在的问题里加入图片 — Andrew S
It's nearly 3 years old. But still very confused what component could fail and months later work again — emma.brady12
emma.brady12 what exact model is your Hitachi TV? Wile your TV has sound and no picture, in a darkened room shine a flashlight beam at an angle against the screen. See if you can make out shapes or silhouettes. This will not work on Plasma TV's etc. so we need to know the model for sure. — oldturkey03

Gabi Salinas @gabisalinas 声誉积分: 1 5 1 · Answer 1 · 2021-12-07T13:50:18-07:00

Gabi Salinas @gabisalinas

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Unplug the HDMI from one input and plug it to a different input to test if a port is bad. Replace the HDMI cable as it may have a short or another defect which causes the black screen issue. Unplug the TV for 5 minutes to attempt a reset. Unplugging the TV will reset the television and clear any temporary issues.

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As mentioned above, have tried unplugging it for many minutes (hours even) and it makes no difference. Have also tried each HDMI port using different cables for each, and also having none plugged in at all. I don't even see the hitachi logo pop up on the screen which it usually does when booting.

由 emma.brady12 完成的 2021年12月7日

That's weird. How old is your TV?

由 Gabi Salinas 完成的 2022年12月27日

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oldturkey03 @oldturkey03 声誉积分: 781.6千 1.1千 893 2.3千 · Answer 2 · 2022-12-27T13:44:53-07:00

oldturkey03 @oldturkey03

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emma.brady12 what exact model is your Hitachi TV? While your TV has sound and no picture, in a darkened room shine a flashlight beam at an angle against the screen. See if you can make out shapes or silhouettes. If you can, you know that it is the backlight that has failed. Since it generates an image, that would be excluding the main board and most likely is a failed backlight array. If there are no images etc. It is possible that this is the T-con board, or the man board not telling the power board to turn the backlight on. Board failures are usually registered by the TV's firmware and would generate a power LED blink code error. This will not work on Plasma TV's etc. so we will need to know the model number.

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Hitachi Television

TV has black screen but has sound. Works after months unplugged

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