my samsung 40" lcd tv will not turn on, i found that a small fuse (3.15a 240v) was blown, i tried to replace it with a new one and as soon as i plugged the tv in it blew, i was told to check the capacitors and all of them seemed to look good can anyone give me any clues as to what is causing the fuse to blow or what i should be checking for? I appreciate any suggestions, thank you
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Samsung LN40B500P3F power on issue
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Re: Samsung LN40B500P3F power on issue
Please post good clear pictures of all the board, at this point you either have shorted bridge rectifier, or shorted out MOSFET.
Also, what is the P/N as printed on the power supply board, BNXX-XXXXXX?
Make sure to use file attachment function in the GO ADVANCED to up load the pictures, do not post pictures in line.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
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Re: Samsung LN40B500P3F power on issue
You should download the service manual for this power supply board, provided by Tom:
http://www.tgohome.com/ServiceManual...g_BN44-00264A_[SCH].pdf
So please tell us your back ground so we will know what you can do. Do you have tools such as DMM, soldlering itron, know how to read diagram?Last edited by budm; 02-20-2013, 10:02 PM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
Comment
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Re: Samsung LN40B500P3F power on issue
I do not have any skills with tv repair but i am a fast learner, i listen well, and i enjoy learning new things, and i am tired of buying new tvs every couple years and throwing out the old ones when i feel they are probably repairable if someone is willing to take the time, and the fact that we cant really afford to buy new tvs anymore
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Re: Samsung LN40B500P3F power on issue
OK, did the TV get hit by power surge or it just stops working by itself?Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
Comment
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Re: Samsung LN40B500P3F power on issue
i tried to download the manual but it says it doesnt exsist anymore? as far as tools go i believe i can get ahold of most of what i might need from a friend. If you could guide me through on what things to check that would be greatly appreciated, just remember i have no idea what alot of components even look like, lol, but i am willing to download pictures, diagrams, etc. if needed, thanks for your help
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Re: Samsung LN40B500P3F power on issue
Ok, But did the TV die by itself or it was hit with power surge?Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
Comment
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Re: Samsung LN40B500P3F power on issue
Next thing I need will be the pictures of the top side of the power supply board, take the pictures in 5 sections so I can easily read the part designator (for example: I want to be able to see Diode DP801, ETC.). Do the same for the bottom side of the board, this will allow me to see the traces on the board so I can tell you the test points on the board. Just remember that I do not have the board in front of me to look at.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
Comment
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Re: Samsung LN40B500P3F power on issue
You will have to remove the board from the chassis, it will be tight fir due to lamp connection fingers on the board, you will have to slide the board away from the sockets so be careful not to break the fingers.
Can you also post the picture of the meter you will be using?
By the way, the replacement is about $70.
http://www.shopjimmy.com/samsung-bn4...t-inverter.htmLast edited by budm; 02-20-2013, 11:48 PM.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
Comment
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Re: Samsung LN40B500P3F power on issue
I need the same thing for bottom side also which where you will be probing.Never stop learning
Basic LCD TV and Monitor troubleshooting guides.
http://www.badcaps.net/forum/showthr...956#post305956
Voltage Regulator (LDO) testing:
http://www.badcaps.net/forum/showthr...999#post300999
Inverter testing using old CFL:
http://www.badcaps.net/forum/showthr...er+testing+cfl
Tear down pictures : Hit the ">" Show Albums and stories" on the left side
http://s807.photobucket.com/user/budm/library/
TV Factory reset codes listing:
http://www.badcaps.net/forum/showthread.php?t=24809
Comment
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Re: Samsung LN40B500P3F power on issue
this link should work for you
http://www.tgohome.com/ServiceManual...&Search=Submit
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Re: Samsung LN40B500P3F power on issue
hopefully you will be able to find the faulty part/parts and fix it buying a replacement board is a last resort realy once budm has saw this post i am sure he will point out and talk you through the tests you need to do i would also while you are waiting make sure your multi meter has a good battery in it there's nothing more annoying than a meter reading under voltage etc leading you on a wild goose chase some times.
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