Hisense 75R63E backlight help

[TVGuy419]

Hey everyone. Hoping someone has some insight as to what may cause brand new backlights look like this behind the diffuser sheet. I've done about 40 TVs and never seen anything like this. Any help is appreciated as this shows through to the picture during lighter color scenes.

[Diah]

Re: Hisense 75R63E backlight help

flip the first solid plate... the smooth surface should be on top

[TVGuy419]

Re: Hisense 75R63E backlight help

flip the first solid plate... the smooth surface should be on top

I flipped it every way possible and still looks the same. I can actually see dark spots through the diffuser lense when the bulbs are off. Seems odd.

[Diah]

Re: Hisense 75R63E backlight help

now are different from first photo.... put the reset and see the result

[TVGuy419]

Re: Hisense 75R63E backlight help

now are different from first photo.... put the reset and see the result

First photo is with backlights turned on and second one is with them off showing the dark spots where each LED is behind the diffuser. With them on, I get the same halo effect no matter how the diffuser is installed.

[Diah]

Re: Hisense 75R63E backlight help

First photo is with backlights turned on and second one is with them off showing the dark spots where each LED is behind the diffuser. With them on, I get the same halo effect no matter how the diffuser is installed.

you did replaced LED BL many time as you wrote... the first Solid Plate had 2 surface.... one with small bubble and other smooth... smooth always on the top facing the rest sheets and LCD... no need to do try... if there are black sport on it, exam them if they are burn or dirty. this is strange.. also be sure the legs stand pieces are straight so this plate will sitting straight. as well the first reflector white paper should be mounted tight to the chassis.

[Diah]

Re: Hisense 75R63E backlight help

BTW the white reflector paper... did have black circle round the LED places... could be this what you are see.

[EazyBone]

Re: Hisense 75R63E backlight help

Yup I've had this happen also. I had a panel issue, so I just tossed the TV but is basically same thing. I know for certain the diffuser was the correct way. When I put tv back together though I tore a ribbon off the panel lol and ruined it. I never decided to investigate further. I don't have an answer either, and for me it was only in the central area of screen as you see.

[TVGuy419]

Re: Hisense 75R63E backlight help

Think I could have received bad LEDs? Seems to me that the light is coming out around the plastic caps and not out the top toward the diffuser. Could be wrong but that's what I see. This is a picture with the diffuser sheets removed but white paper in place.

[Diah]

Re: Hisense 75R63E backlight help

Think I could have received bad LEDs? Seems to me that the light is coming out around the plastic caps and not out the top toward the diffuser. Could be wrong but that's what I see. This is a picture with the diffuser sheets removed but white paper in place.

the original LED lens was Concave as the replacement or they were Convex !!!

[TVGuy419]

Re: Hisense 75R63E backlight help

the original LED lens was Concave as the replacement or they were Convex !!!

Both are concave.

[Diah]

Re: Hisense 75R63E backlight help

Both are concave.

feed the TV with signal that you will hear sound... then the LED currents will turn High... it may now low currents cause no LCD in place and no video signal.. better put the solid plate as described in order and try.

[TVGuy419]

Re: Hisense 75R63E backlight help

feed the TV with signal that you will hear sound... then the LED currents will turn High... it may now low currents cause no LCD in place and no video signal.. better put the solid plate as described in order and try.

I had the TV back together and watched a football game on it. You can clearly see the LEDs on all light colored scenes. Darker colors look great. Messed with backlight and brightness which really didn't change anything.

[Diah]

Re: Hisense 75R63E backlight help

check psu bl currents...

[EazyBone]

Re: Hisense 75R63E backlight help

I'm probably not a solution but the paper sheet is pushed down as far as possible? Generally they are taped down. Also, maybe the picture is to the side but are the LED caps off center? The picture shows them maybe sideways slightly, could be angle of cap.

Very curious myself because why did I have the problem only on part of one of my screens also lol.

[Diah]

Re: Hisense 75R63E backlight help

could be angle of cap.
.

LED lens fitting by Robot. with Laser position sensor,, no way for mistake..

LEDs if its specification higher as original will make shadow. same if the PSU current are low as it should... other reasons the order of the sheets.

[EazyBone]

Re: Hisense 75R63E backlight help

https://www.reddit.com/r/TVRepair/co...rough_display/

Here's a post with similar tv. He may have lost a diffuser sheet.

[TVGuy419]

Re: Hisense 75R63E backlight help

https://www.reddit.com/r/TVRepair/co...rough_display/

Here's a post with similar tv. He may have lost a diffuser sheet.

I kept the diffuser sheets taped together so I didn't mess them up during installation. Really starting to lean toward crap replacement LEDs. I can't see the reflective paper causing uniform halos like this.

[EazyBone]

Re: Hisense 75R63E backlight help

I kept the diffuser sheets taped together so I didn't mess them up during installation. Really starting to lean toward crap replacement LEDs. I can't see the reflective paper causing uniform halos like this.

Hey I can't either. I'm just throwing a bunch of possibilities. I've had a diffuser sheet slide off the top before on something unstable. This happened in my picture also only on part of the screen.

I once forgot to put all the diffusers back and put the TV and screen back together lol dumb mistake. The screen looked very cool after I turned it on lol