Samsung LN40B500P3F power on issue

[jonesfamily]

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

[budm]

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.

[jonesfamily]

Re: Samsung LN40B500P3F power on issue

the number on it is BN44-00264A, i am working on downloading pictures please be patient im new at this, sorry

[jonesfamily]

Re: Samsung LN40B500P3F power on issue

these are the pictures i took, hope they work, let me know if you need more or better ones, closer etc. thanks

[budm]

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?

[jonesfamily]

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

[budm]

Re: Samsung LN40B500P3F power on issue

OK, did the TV get hit by power surge or it just stops working by itself?

[jonesfamily]

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

[jonesfamily]

Re: Samsung LN40B500P3F power on issue

i believe it just kinda stopped working, just wouldnt turn on one day

[budm]

Re: Samsung LN40B500P3F power on issue

Ok, But did the TV die by itself or it was hit with power surge?

[jonesfamily]

Re: Samsung LN40B500P3F power on issue

I believe it died by itself, we did have a couple storms but dont think it died at the time we had the storms

[budm]

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.

[budm]

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.htm

[jonesfamily]

Re: Samsung LN40B500P3F power on issue

hopefully this works, its alot harder than i thought to take clear pictures of such small numbers, if these dont work let me know it might work better during the daytime with better lighting,

[budm]

Re: Samsung LN40B500P3F power on issue

I need the same thing for bottom side also which where you will be probing.

[jonesfamily]

Re: Samsung LN40B500P3F power on issue

ok i will try to get the board out, is there anything special i need to know about taking it out or do i just oviously need to be careful?

[vinceroger69]

Re: Samsung LN40B500P3F power on issue

this link should work for you
http://www.tgohome.com/ServiceManual...&Search=Submit

[jonesfamily]

Re: Samsung LN40B500P3F power on issue

here is the pictures you requested, thanks again for your patience

[jonesfamily]

Re: Samsung LN40B500P3F power on issue

thank you vinceroger, im sure the diagram will help me with finding what i need to check once i know what to check, if something on the board is bad is it possible to fix it or does the whole thing have to be replaced?

[vinceroger69]

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.