Samsung LN40B500P3F power on issue

[telobeck]

Re: Samsung LN40B500P3F power on issue

I have the same board & tv, only mine just flashes a few times on and off.
I get readings on everything in this process except 2&3.... I get nothing on 2 and 3. any thoughts would be appreciated.

Exact same for me aswell. It was hard to turn on one morning, then nothing.

Open 3.15 250v fuse at location fm8025 (just below the 450v 82uf caps.

Arg its hard to justify a $70 board when black friday is a month away..

[Keith Miller]

Re: Samsung LN40B500P3F power on issue

I appreciate this is a bit late in the day but was this resolved. I have the same problem on a 37" Samsung and my rectifier checks out ok.

Help appreciated, Keith

[vinceroger69]

Re: Samsung LN40B500P3F power on issue

I appreciate this is a bit late in the day but was this resolved. I have the same problem on a 37" Samsung and my rectifier checks out ok.

Help appreciated, Keith

keith it may be advisable to start your own new thread as some times when there really long some members wont read them i also advise if you can to explain what your set symptoms are and what you have checked if you can also post up a picture of each boards in your set we might be able to spot something your missing.

[kw_friday]

Re: Samsung LN40B500P3F power on issue

Was this issue resolved? The link appears to have stopped before a resolution was found.

[dkmoore]

Re: Samsung LN40B500P3F power on issue

OK, put in the new fuse (3.1A fuse) and remove the main AC fuse, then put the lamp on that fuse clip instead.
Then lift one leg of the inductor BD901 (on page 2 of the diagram). Then use the Ohm meter in 200 Ohm scale and check the resistance between one end (either end of this new fuse) of the 3.15A fuse and the negative leg of any of the two large cap to see what you get.

I am troubleshooting this same problem up through this step. I am about to do this test. Any chance there is someone still out there to guide me from here onwards?

[johnkemmerer]

Re: Samsung LN40B500P3F power on issue

OK, set the meter to OHM mode at 200 scale (we are looking for low resistance reading due to shorted out components).
So take the reading between
1 & 2 =
1 & 3 =
1 & 4 =
2 & 3 =
2 & 4 =
3 & 4 =

new to the thread here...i have the issue with my board. i got no reading between 2 & 3. what does that suggest? thx.