Question about Samsung UN46D7000LF 3D TV

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UN46D7000LF Try to turn the TV on, and now it just tries to start and then turns off and then tries to start again and then turns off again and keeps going through this same cycle. I have to unplug from the power outlet to get it to stop.

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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  • 4 Answers

SOURCE: my samsung 40" lcd power problem

I had the same problem with my Samsung LN26A450 LCD TV. I found the following YouTube video http://www.youtube.com/watch?v=Mm51C_RDIZE titled "Samsung TV Repair - Part 1 of 2) (also watch Part 2 of 2) which shows how to easily fix the problem. The problem is bad capacitors on the power supply board. My TV had seven (7) bad capacitors - all 7 had dark stains on the ends from leaking electrolytic fluid and one (10V 2200MFD) was blown with bulging ends. I ordered 7 new high-temp (105 degrees C) aluminum radial capacitors from DigiKey.com matching the Temperature, Capacitances and Voltage Ratings for each damaged capacitor that I removed. I followed the instructions in the video except I used desoldering braid ($3.99 at RadioShack) to remove the solder attaching the bad capacitor leads to the power supply board. Once you wick up the old solder from all sides of each lead wire using the desoldering braid, the bad capacitors are easily removed. Total cost of repair including soldering equipment was less than $50. Thanks to “The Professor” for posting the video and saving me $400.

Posted on Oct 30, 2009

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  • 210 Answers

SOURCE: My Samsung LCD tv clicks over and over again but won't power on

this is common fault the capacitors have blown on main power board you can replace your self if got soldering iron
take back off tv and look for capacitors that have RAISED TOPS they look like little batteries with white line on one side and numbers (e.g 2000mf 25v ) the best way to remember which way they go back is take picture
you can get parts from charles hyde and sons web site (CHS) under general components or at a electronic shop

Posted on Dec 14, 2009

eagle338
  • 4889 Answers

SOURCE: Samsung LN46A550 LCD power on/off problem again.

It is the Main A/V board that is faulty, not the power supply. The rainbow screen that you are seeing and the searching for signal message before it shuts off confirms this. It is the large board at the center of the tv. If you can get me the part number off it, I can find you the replacement. It will be either printed on the board itself or on a small label.

Sai.

Posted on Feb 05, 2011

  • 1 Answer

SOURCE: my Samsung flat screen tv won't turn on and it

There's a couple transistors on the Power Supply board that are probably bad. On mine, the solder joint was bad on the bottom side of the board that pointed me at those transistors in particular. Part number is FQPF9N50C. Also, you could get a refurb or new power supply board of ebay or send your board in for service (also on ebay).Or there's a "repair kit" you can get that contains 4 transistors and a couple caps I think. If you are an electronics junky and like soldering stuff, that would be the way to go... I just ordered the two transistors off ebay for like $6.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=320632712822
http://cgi.ebay.com/Samsung-HP-T4254-Internal-Replacement-Circuit-Board-/230575679230?pt=LH_DefaultDomain_0&hash=item35af61a6fe
http://cgi.ebay.com/REBUILD-YOUR-SAMSUNG-BN44-00161A-Power-Supply-/200513469692?pt=LH_DefaultDomain_0&hash=item2eaf88bcfc

Posted on Feb 05, 2011

  • 8457 Answers

SOURCE: Samsung LN46A550 LCD power on/off problem again.

Yes,T-Con board is dead.Tries websites like Shopjimmy.com,Ebay.com to buy a refurbish T-Con board for the replacement.

Posted on Feb 06, 2011

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Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary.

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