Samsung PN50A450P1D Pink Screen Problem

[bedrck46]

Screen problem occurred about 6 years ago. Since then the TV has been unused and in storage.
Screen has a pink tint. See attached pics.
Set has 5 boards. Part numbers are:
BN44-00207A Power Supply
LJ41-05309A Main Logic
LJ41-05986A Y Main
LJ41-05987A X MAIN with Sub Board
BN94-02067B Main Board

Any suggestions as to what board/s can be the cause of the problem will be appreciated.
Thanks

[tvtimmy]

Re: Samsung PN50A450P1D Pink Screen Problem

Run the test patterns. Unplug set,let sit 5 min. Unlatch the flat ribbon that goes from the mainboard to the logic board. Put a clip across pins 3&4 as shown in pic. Plug tv back in and watch the screen. If all colors look good, your mainboard is bad.

[bedrck46]

Re: Samsung PN50A450P1D Pink Screen Problem

tvtimmy

Thank you for your reply
Sent you a PM

[bedrck46]

Re: Samsung PN50A450P1D Pink Screen Problem

***UPDATE***

With the help of tvtimmy It has been determined that the X-Main board is causing the problem.
Will replace the board and update the forum as to the results.

[Andrew F. Ali]

Re: Samsung PN50A450P1D Pink Screen Problem

Would it be too much to ask you to share with us the method to determine, the X-Main Bd. is the problem?

[bedrck46]

Re: Samsung PN50A450P1D Pink Screen Problem

Would it be too much to ask you to share with us the method to determine, the X-Main Bd. is the problem?

See post #2 As to what was suggested for me do.
I never did run the tests that were suggested. However before I did anything else I checked the fuse on the X-Main board and discovered it was blown.

The following is the conversation I had with tvtimmy

bedrck46, Before I follow your suggestion I have found that the
6.3 amp fuse was blown on the X-Main board.
Would you suggest that I replace the fuse and try the set again or would you suggest I replace the board?

I have looked at the board and I can not see any bad caps or burn marks on the front of the board. I have not removed the board to check the back side.

tvtimmy, Yes. Replace the fuse and check all the fets for shorts.

bedrck46, I replaced the fuse The TV would not turn on. I also was getting TWO flashing green LED's on the logic board and also a relay on the power supply was clicking on and off.

I then removed the fuse (it was still good Didn't blow) and turned the TV back on and now I am able to get the pink screen and also ONLY one green LED on the logic board if flashing.

My thoughts are the X-Main is bad Your thoughts?
Thank you.


tvtimmy, Yes, the xmain is the problem.
There are 5 x- mains for that tv, what is your board number?
The most common one is very cheap at shopjimmy and even cheaper on ebay.

At this point I have ordered a replacement board and will update this thread after I receive and replace the board.

[bedrck46]

Re: Samsung PN50A450P1D Pink Screen Problem

***UPDATE***

Problem resolved. Replaced the X-Main Board

[tvtimmy]

Re: Samsung PN50A450P1D Pink Screen Problem

Good job!!!

[bedrck46]

Re: Samsung PN50A450P1D Pink Screen Problem

Thank you

[m_guimont323]

Re: Samsung PN50A450P1D Pink Screen Problem

Sorry to revive an old thread.. but I have a similar issue to this but due to the picture distortion as well as the colour. I wanted to confirm the diagnosis was indeed the X-main board as well.

I have the same TV as the listed on above: PN50A450P1D.

The TV spent its time off for the prior week, went to flip it on and as it booted heard a loud pop and the picture looked like the images attached.

Found a popped capacitor on the power board which was replaced, but the TV still has a distorted & discolored picture. I ran the diagnosis (jump pins 3 & 4 with main board disconected) with no change in the picture, TV was only on for a few second before turning itself off.

Can this be traced to an X-main board failure?

[Andrew F. Ali]

Re: Samsung PN50A450P1D Pink Screen Problem

From the previous posts I would think you have a bad X-Main Bd. One of the posts spoke to the many X-Main Bds for that model TV. Check and double check before purchasing to ensure you get the correct board for your TV.