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Old 04-20-2017, 12:27 AM   #1
engelwood39
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Default Samsung ln-t4061f stuck in rebooting sequence

I have a Samsung ln-t4061f that would just click when you tried to turn it on. I pulled off the back and saw that 4 caps were bulged. I ordered the replacement caps and installed them, when I plugged the tv back in it made a startup sound and went to a black (but back-lit screen). It will then shut itself down after about 10 seconds and then try to reboot again after about 5 more seconds. Any advise?
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Old 04-20-2017, 03:49 AM   #2
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Default Re: Samsung ln-t4061f stuck in rebooting sequence

Always a good starting point when asking for assistance.
http://www.badcaps.net/forum/showthread.php?t=39740
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Old 04-23-2017, 11:29 PM   #3
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Default Re: Samsung ln-t4061f stuck in rebooting sequence

sorry, dick barton. I will get some pics up, but I already replaced the bulged caps

Last edited by engelwood39; 04-23-2017 at 11:33 PM..
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Old 04-24-2017, 10:24 AM   #4
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Default Re: Samsung ln-t4061f stuck in rebooting sequence

Might try unplugging t-con and see if it stays on.
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Old 04-24-2017, 12:16 PM   #5
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Default Re: Samsung ln-t4061f stuck in rebooting sequence

When I unplugged the T-con it didn't change anything.

Here are the pics. I put yellow arrows to the caps that I replaced with these caps:

http://www.ebay.com/itm/172024725260...%3AMEBIDX%3AIT
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File Type: jpg 2017-04-24 12.07.00.jpg (408.7 KB, 22 views)
File Type: jpg 20170423_235511.jpg (449.0 KB, 26 views)
File Type: jpg 20170423_235526.jpg (605.6 KB, 17 views)
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Old 04-24-2017, 12:40 PM   #6
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Default Re: Samsung ln-t4061f stuck in rebooting sequence

Check rectifiers on cold side around where you changed capacitors
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Old 04-24-2017, 12:41 PM   #7
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Default Re: Samsung ln-t4061f stuck in rebooting sequence

What voltages do you have on CN801 when it first comes up and when it goes to black.

Check the soldering on T1801 for poor joints.

Last edited by dick_barton; 04-24-2017 at 12:43 PM..
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Old 04-24-2017, 10:27 PM   #8
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Default Re: Samsung ln-t4061f stuck in rebooting sequence

dick_barton, I sent a picture of the solder joints on T1801. They look pretty good to me.

I also sent a picture of CN801 (2nd picture). It has a 24 pin connector to it and I'm not sure what you want me to test on it? Also does the ribbon cable need to be plugged in when I make the tests?

The 3rd Picture is of connector CN1801 and CN1802. I was wondering if that was what you maybe were wanting the voltage on instead of CN801?

Hey dskall, I am not sure how to test the rectifiers. Could you let me know what I should do to test them and where they are?
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File Type: jpg 2017-04-24 21.43.46.jpg (376.1 KB, 11 views)
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Old 04-25-2017, 03:55 AM   #9
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Default Re: Samsung ln-t4061f stuck in rebooting sequence

Isn't this model known for bad caps which in turn corrupts the firmware on the main board?
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Old 04-25-2017, 04:55 AM   #10
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Default Re: Samsung ln-t4061f stuck in rebooting sequence

+1
The previous threads do indicate bad capacitors and there are repair kits out there on Ebay so may be a good starting point to replace existing capacitors.
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Old 04-25-2017, 10:02 AM   #11
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Default Re: Samsung ln-t4061f stuck in rebooting sequence

Quote:
Originally Posted by dick_barton View Post
+1
The previous threads do indicate bad capacitors and there are repair kits out there on Ebay so may be a good starting point to replace existing capacitors.
I replaced the capacitors that were bad already. I replaced all four that are included in the Ebay repair kits. These are the capacitors that I used instead of buying the more expensive kit. They have the same ratings and were pretty popular on BadCaps preferred capacitors thread.

cliff_hootarski, Does that mean that replacing the capacitors may not be the fix? I may need to replace the main board?
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Old 04-25-2017, 10:06 AM   #12
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Default Re: Samsung ln-t4061f stuck in rebooting sequence

Would need good pictures of front and back of mainboard to see if this is board with that problem.
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Old 04-25-2017, 12:08 PM   #13
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Default Re: Samsung ln-t4061f stuck in rebooting sequence

Quote:
Originally Posted by engelwood39 View Post
I replaced the capacitors that were bad already. I replaced all four that are included in the Ebay repair kits. These are the capacitors that I used instead of buying the more expensive kit. They have the same ratings and were pretty popular on BadCaps preferred capacitors thread.

cliff_hootarski, Does that mean that replacing the capacitors may not be the fix? I may need to replace the main board?
The kit I believe which was referred to in that thread said changed all 9 capacitors?
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Old 04-25-2017, 11:13 PM   #14
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Default Re: Samsung ln-t4061f stuck in rebooting sequence

Here are the pics of the main board dskall.

Dick Barton, Do you suggest that I replace all the capacitors on the power board? Also were you able to clarify what point you wanted me to test voltage at? Was it the CN1801 or CN801? (The attached pictures with those close up are on the post 6 up from this one)
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Old 04-25-2017, 11:57 PM   #15
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Default Re: Samsung ln-t4061f stuck in rebooting sequence

Not a board I am familiar with having bad caps
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Old 04-26-2017, 03:57 AM   #16
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Default Re: Samsung ln-t4061f stuck in rebooting sequence

CN801 I think it's marked. There's a legend on the board naming the pin out so if you could provide the voltages alongside could prove useful.


http://www.ebay.co.uk/itm/Repair-Kit...-/230579176045

You may have an EEPROM problem if the set is rebooting but it's best to check the voltages are correct and caps have not failed first.
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Last edited by dick_barton; 04-26-2017 at 04:01 AM..
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Old 04-26-2017, 05:33 AM   #17
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Default Re: Samsung ln-t4061f stuck in rebooting sequence

This is what I was thinking of when I said bad caps (on the power supply) could corrupt the eeprom data.

https://wiki.samygo.tv/index.php/UnB...y_EEPROM_Reset

However, I don't see your TV listed.
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Old 04-26-2017, 06:06 AM   #18
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Default Re: Samsung ln-t4061f stuck in rebooting sequence

does heating or cooling the boards alter anything?
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Old 04-28-2017, 12:06 PM   #19
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Default Re: Samsung ln-t4061f stuck in rebooting sequence

Here are the voltages:

Power on/off: 2.78V
STB 5.2V: 5.233V
12V: 11.95V
5.4V: 5.38V
13V: 12.95

Just to clarify what is is doing: It plays a start up tune (i think its a startup tune) and then the backlight comes on with nothing displayed. It stays illuminated for approximately 30 seconds when it shuts down for a couple seconds and then starts the cycle over again back in a loop.

I already ordered the Ebay kit that has all of the caps that are on the board. Not sure it that is a waste of time at this point? Here is the kit:

http://www.ebay.com/itm/330524305728...%3AMEBIDX%3AIT
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Old 04-28-2017, 09:12 PM   #20
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Default Re: Samsung ln-t4061f stuck in rebooting sequence

Quote:
Originally Posted by engelwood39 View Post
Here are the voltages:

Power on/off: 2.78V
STB 5.2V: 5.233V
12V: 11.95V
5.4V: 5.38V
13V: 12.95

Just to clarify what is is doing: It plays a start up tune (i think its a startup tune) and then the backlight comes on with nothing displayed. It stays illuminated for approximately 30 seconds when it shuts down for a couple seconds and then starts the cycle over again back in a loop.

I already ordered the Ebay kit that has all of the caps that are on the board. Not sure it that is a waste of time at this point? Here is the kit:

http://www.ebay.com/itm/330524305728...%3AMEBIDX%3AIT
Would it be recommended to try replacing all the capacitors on the power board at this point, or should I look in another direction?

Thanks
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