Samsung LN-T4069F Screen startup problem

[darkTime]

I got a Samsung LN-T4069F with a strange startup problem. When first turned on after a long interval, there is blooming that begins in the lower right corner and eventually envelopes the entire screen. If you leave it in this state for about 10 mins, then power cycle, the TV turns on as normal with no discernible defects. If you power cycle the set before about 10 min, the same blooming occurs.

I have provided the follow video of the problem to assist with troubleshooting:

https://youtu.be/8yFhBDu2iRg

[darkTime]

Re: Samsung LN-T4069F Screen startup problem

Just an update,

I have inspected all the boards and nothing looks unusual (no bulging caps). I have reseated all the connections and the problem still persists. Any ideas?

[sdp1]

Re: Samsung LN-T4069F Screen startup problem

I have the same problem...

I have a Samsung LN-T4069F. When you turn on the TV we get a cloudy grey screen like this -> https://www.youtube.com/watch?v=8JdFcCmNdkc. If I turn off the TV at this point, it will turn off/on repeatedly. Only after turning on the TV and letting it warm up for 15-20 minutes with a grey screen will it work fine. I replaced all the electrolytic caps on the power supply board but it didn't fix the problem. In the comments, someone posted that they replaced certain caps on the BN94-01442B board as in here -> http://www.riddledtv.com/forums/sams...fix-t3301.html.

I'm going to look into replacing caps on the logic board. So far I see the caps(Aluminum Electrolytic Capacitors - SMD) available on Mouser.com for about 0.50/piece

[budm]

Re: Samsung LN-T4069F Screen startup problem

Thanks for the link. Do you have ESR meter to see when you start removing the suspected bad caps to see which one is/are bad will be great?

[johnboy1313]

Re: Samsung LN-T4069F Screen startup problem

Change the FRC board above the mainboard. It connects to the T-Con and the mainboard. I just fixed the same TV last week with the same issue though mine was grey and blotchy right from the start. I purchased the board for $10 via eBay. My part number was BN96-06669A

[budm]

Re: Samsung LN-T4069F Screen startup problem

BTW, the picture in the RIDDLEDTV link is FRC board.
$10 is really cheap! good price. $40 @ SJ.

http://www.shopjimmy.com/catalogsear...sung+LN-T4069F

[johnboy1313]

Re: Samsung LN-T4069F Screen startup problem

BTW, the picture in the RIDDLEDTV link is FRC board.
$10 is really cheap! good price. $40 @ SJ.

http://www.shopjimmy.com/catalogsear...sung+LN-T4069F

It was $14 or best offer. I offered $10 and they accepted. Super fast shipping too.