Hisense 65R6E3 - Power cycles no backlight

[jason123]

Hi folks.. Would appreciate your help.

Hisense TV that doesn't turn on (no pic, no backlight)

Flashlight tests shows activity on the screen (Hisense ROKU) then off then again.

On the connector from PS to main, I see Vstandby (2.5 V), VAMP (16.9V) and 12V (11.86 V)

As the TV cycles, VAMP goes from 16.9 to 17.6V then back to 16.9V

Any thoughts? never seen a standby voltage as low as 2.5V. Not sure if backlight is bad, but that doesn't explain the reboot cycle - right?

[neilc6]

Re: Hisense 65R6E3 - Power cycles no backlight

The Roku TVs when first plugged in, turn on, take a minute or two to boot and then go into standby mode. The TV needs to be turned on a second time to get out of standby. I would suspect bad LEDs. Vstandby may be a logic signal from main to go in and out of standby.

[jason123]

Re: Hisense 65R6E3 - Power cycles no backlight

Thanks Neilc6. I have attempted a restart. Tv is non-responsive to Remote it seems. Just stays in the on / off cycle (No backlight, just flashlight test screen activity)

Do bad LEDs explain this?

[neilc6]

Re: Hisense 65R6E3 - Power cycles no backlight

If you have no backlight, backlights are suspect. With a LED tester you can power one string of the backlights independent of the power supply so at least you can see the screen.

[jason123]

Re: Hisense 65R6E3 - Power cycles no backlight

If you have no backlight, backlights are suspect. With a LED tester you can power one string of the backlights independent of the power supply so at least you can see the screen.

All the strips are connected together, so one string, and not lighting up.. so I'm hoping this is it!

[jason123]

Re: Hisense 65R6E3 - Power cycles no backlight

Thanks neilc6 ... LEDs were the problem, though I've never seen a TV that continuously reboots and doesn't respond to remote / Push buttons because LEDs went bad.

Anyway, it's up an running with repaired set (lenses never align right) so a new LED set on-order.
Thanks again

[dskall]

Re: Hisense 65R6E3 - Power cycles no backlight

I install lens with led lit, looking straight down on them. New set is best option though.

[ajshoe]

just a heads up on this set - extremely hard to get display apart as this is a glued display screen onto a black plastic bezel. In my opinion - not worth fixing. This can easily turn into a 3 hour repair !

[EazyBone]

Suction cup 6-8 inches from bottom pull the buffer boards and tape them onto screen with masking. Take cardboard business card and slowly get under front corner while lightly lifting suction cup. Slowly go around the edge moving the suction cup to get a little lift while sliding the card. Haven't broke one yet.

[ajshoe]

That's exactly the way I removed the screen. After doing that though I realized that removing the black bezel with the screen still attached would be much easier and then you don't have to clean the 3mm tape off both surfaces and re-attach new 3mm tape. Has anyone tried this method ?