Hisense 65H9908 picture disappears after 20 min of viewing.

Question

Hisense Television

Repair documentation and service information for Hisense televisions.

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Bubba Jay @bubbajay

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crwdns2931729:0crwdne2931729:0: Ndz 26, 2023

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Hisense 65H9908 picture disappears after 20 min of viewing.

TV is only 5 years old. Model 65H9908. Turn on TV works fine (audio and video) for about 20 min, then picture fades in toward the center and get audio only. Can turn off the tv, then back on, and video will return to normal for another 10min or so, then fade to black again.. Can turn off the tv and turn it back on and video will restore. IT's almost like a software bug was placed in the TV to break down at the 5 year mark to force you to buy a new one.

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My Hisense tv looses picture after 5 minutes of viewing

crwdns2934271:0Mud 5, 2025crwdnd2934271:0 Andrew Banda crwdne2934271:0

@andrewbanda do you still have sound? if you do, turn the TV to a channel where you can hear the sound. Next, use a flashlight and shine the beam at an angle against the screen. Do that in a darkened room. See if you can make out shadows or shapes. If you do, then it is your backlight that has failed.

If you do not see anything, unplug your set and remove the back cover. Then visually check the boards for any obvious damaged components. Check all the wiring and unplug the wires and plug them back in, make sure they are properly seated. Post some images of all of your boards with your question. Use this guide Adding images to an existing question for that so we can see what you see. It is possible that this is either a power board or a T-con board issue.

crwdns2934271:0Mud 5, 2025crwdnd2934271:0 oldturkey03 crwdne2934271:0

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oldturkey03 @oldturkey03

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crwdns2931729:0crwdne2931729:0: Ndz 26, 2023

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@bubbajay "picture fades in toward the center" this is the part that is worrisome. It is not a common error but seems to originate either on your main board or on your panel. Check the LVDS cables going to your panel. Check for tears and corrosion. Next check for obviously overheating/damaged components on the the "long, skinny" boards that connect via multiple ribbon cables to the LCD. Those are the driver boards and the error can originate on those. The other thing to check is the memory and the processor on your main board. Check for overheating on that as well. You can always try some freeze spray and once your TV displays those symptoms, spray on the main board and see if that restores it. Try the same on your driver boards.

You do want to remove the back of your TV and post a couple of real good pictures of all of your boards with your Question. that way we can see what you see. Adding images to an existing question

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Thank you @oldturkey03! For sure it has something to do with heat because if I leave the TV off for a significant period of time, the TV will not "fade out to black" for hours after that cooling off period. Not sure why a component would fail like that though. It's almost like there was a new firmware update that now monitors the component temps, and fails when that component reaches a certain temp, as a safety measure of some sort. The chip is obviously still functioning just fine, as is the cct board because the picture restores after cooling. So bizarre.

crwdns2934271:0Ndz 27, 2023crwdnd2934271:0 Bubba Jay crwdne2934271:0

@bubbajay something like this "picture fades in toward the center" would not be in the firmware. IT's the fading that gives it away. Give it a try with the freeze spray or use a FLIR cam and see if you can detect the hot spot.

crwdns2934271:0Ndz 27, 2023crwdnd2934271:0 oldturkey03 crwdne2934271:0

crwdns2934285:0crwdne2934285:0

@andrewbanda do you still have sound? if you do, turn the TV to a channel where you can hear the sound. Next, use a flashlight and shine the beam at an angle against the screen. Do that in a darkened room. See if you can make out shadows or shapes. If you do, then it is your backlight that has failed.

If you do not see anything, unplug your set and remove the back cover. Then visually check the boards for any obvious damaged components. Check all the wiring and unplug the wires and plug them back in, make sure they are properly seated. Post some images of all of your boards with your question. Use this guide Adding images to an existing question for that so we can see what you see. It is possible that this is either a power board or a T-con board issue. — oldturkey03
Thank you @oldturkey03! For sure it has something to do with heat because if I leave the TV off for a significant period of time, the TV will not "fade out to black" for hours after that cooling off period. Not sure why a component would fail like that though. It's almost like there was a new firmware update that now monitors the component temps, and fails when that component reaches a certain temp, as a safety measure of some sort. The chip is obviously still functioning just fine, as is the cct board because the picture restores after cooling. So bizarre. — Bubba Jay
@bubbajay something like this "picture fades in toward the center" would not be in the firmware. IT's the fading that gives it away. Give it a try with the freeze spray or use a FLIR cam and see if you can detect the hot spot. — oldturkey03

Hisense Television

Hisense 65H9908 picture disappears after 20 min of viewing.

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