Samsung le32a457

[sordids999]

Voltages seem fine got it today was told it works then won't turn on again and if they leave it a few days it works again

Would it helping changing the caps to panasonic caps ?

[tom66]

Re: Samsung le32a457

If the PSU voltages are low when it stops, it could be a good idea. However main board failure is a lot more common on these.

[sordids999]

Re: Samsung le32a457

Ok ill change the caps anyway, so how can I check to see if the mainboard is ok ?

[tom66]

Re: Samsung le32a457

If the PSU voltages are OK, then I suspect the main board is the most likely cause. Of course you should observe symptoms so check things like does the backlight go out? Video freeze? Sound go bad? Just narrow it down and see what the most likely cause of ALL of the faults is rather than any one particular fault.

[sordids999]

Re: Samsung le32a457

Right been running for ages turned off the tv tried to turn on again but the standby light flashing 24volts was 15 volts 12 volts was 8.5volts then eventually turned itself back on

[tom66]

Re: Samsung le32a457

Hmm, well that would seem to point to a PSU problem; were those stable or jumping about?

[sordids999]

Re: Samsung le32a457

stable m8

[tom66]

Re: Samsung le32a457

Can you confirm the BN44 number on the PSU.

[sordids999]

Re: Samsung le32a457

Bn44-00214a

[tom66]

Re: Samsung le32a457

Replace CM808 the 18nF 630V capacitor. It has caused issues like this before.
CPC:
http://cpc.farnell.com/panasonic/ecq...v-5/dp/CA06936

Free delivery, don't abuse it by buying only one or they might stop offering that to you...

[sordids999]

Re: Samsung le32a457

shall i change the caps while im doing this they look fine to be fair ?

[tom66]

Re: Samsung le32a457

You might as well, given there are only a few on this board and they do fail from time to time.

edit: Whoops, that one is 50V... It will not work... I will try to find a better match...

[tom66]

Re: Samsung le32a457

Looks like CPC do NOT stock the req'd part which is annoying.
Please confirm value of CM808 in your board?

[sordids999]

Re: Samsung le32a457

i cant find a CM808 only CM809

[tom66]

Re: Samsung le32a457

Should be a small box capacitor about 1" long near the yellow transformer.

[sordids999]

Re: Samsung le32a457

Found it sorry it has 10n J 630v 389 MKP

[tom66]

Re: Samsung le32a457

Are you sure that is not a dodgy 18n print? Hard to tell....

[tom66]

Re: Samsung le32a457

It's amazing, I can't find the capacitor anywhere but some weird place in Greece, £5 for one cap is a bit steep... maybe have a look around in a few other places
http://www.ebay.co.uk/itm/Wima-0-018...item4158c16f7d

[sordids999]

Re: Samsung le32a457

You might be right tom

[tom66]

Re: Samsung le32a457

22nF is a lot easier to get hold of; if you want, you can try that first. Make sure it works on all modes and all brightnesses. 18nF could be penny pinching by Samsung or maybe it's important for matching the transformer, I do not know. The schematic says 18nF.