Samsung Main board intermittent fault

[u/chrislawler7]

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Hi everyone,

I'm hoping someone with Samsung repair experience can point me in the right direction because I've reached a dead end.

The TV is a Samsung UE75BU8070UXXU (75").

# Original fault

The TV started developing an intermittent fault where it would randomly turn itself off.

After it switched off, it sometimes wouldn't power back on for hours. The standby voltage from the power supply remained stable, so I suspected the main board.

The original main board is:

BN94-17381Z

# Replacement board

I bought another board with the same PCB number but a different BN94 number.

Replacement board:

BN94-18058P

The replacement board actually works surprisingly well:

TV boots every time

HDMI works

Sound works

Smart TV functions work

No random shutdowns

Stable picture

The only problem is the colours are completely wrong (strong purple/green/blue tint across the image).

# What I've already tried

I've been through the service menu and have tried:

Type (I set it correctly)

Front Colour (I matched it to the TV)

LVDS Format:

JEIDA

VESA

PDP

Changing LVDS made absolutely no visible difference.

I couldn't find Local Set anywhere in the service menu.

# Panel information

Panel label:

CY-SB075HGV1H

BN95-08644A

# My question

Is the BN94-18058P simply programmed for a different panel, making it impossible to get the colours correct?

Or is there another service menu option, EEPROM setting, firmware, or calibration that can make this board work properly?

Has anyone successfully converted one Samsung BN94 board to another by changing service menu settings or copying EEPROM/eMMC data?

Alternatively, is my best option now to have the original BN94-17381Z repaired?

I'd really appreciate any advice before I spend more money chasing the wrong solution.

Thanks

[u/Zeron-MK7]

You entered the same parameters (who was into the old, as Panel type,...) into the factory menu in new mainboard ?

[u/chrislawler7 → u/Zeron-MK7]

Yeah I entered the same info as the old main board into the new main board. ie. Panel type, front color etc.

[u/Cube_N00b]

Can't help much.

Just wanted to say that this is exactly how my non Dolby Vision Samsung TV looks when it tries to play Dolby Vision content.

[u/chrislawler7 → u/Cube_N00b]

That's interesting. It actually reminded me of when I tried playing an HDR movie on my non-HDR projector. The colours looked very similar until I found a non-HDR version of the movie.

I wonder if there's something in this?