Technical > Electronics > Samsung LN-T4065F problems

Samsung LN-T4065F problems

Well, the fact that it's scrambled on the "no signal" source screen means you can pretty much rule out a bad cable.

I'd open it up and check all the electrolytic capacitors for bulged/leaking capacitors. It's a fairly common problem and can lead to weird things happening once they go bad enough. If that is the problem, then the fix is rather easy: replace the caps.

reply to Whiskers
Thanks for the reply...I have read that the power supply has 5 caps that are 10 volts and they should be changed to 16 volts...would that cause my trouble? Thanks again.

If the caps are underrated or bordeline, yes, they can fail prematurely. Again, they will probably have leaked or bulged.

Open up the monitor and perform a visual inspection of the capacitors. If any of them appear to have bulged or leaked, replace ALL of the caps in the low voltage side of the power supply.

I'm gonna open it up today and check it out...i'll let you know.
Thanks

Well, I opened it up and don't see anything unusual...all the caps look good (no leaking or bulging caps) so, maybe I should change the caps on the power supply and hope that fixes it? Any suggestions would be highly appreciated....

Thanks

Can you post a couple of pictures?
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Striving for Parfection.

It is a little different for ANON users, but hopefully this will help.

»/dev/null forum FAQ »How do I post attachments & screen shots?

Since you already have pictures, you can ignore that part.
--
Striving for Parfection.

Those are dead caps.

Perhaps someone with more relevant experience on this set will chime in.
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Striving for Parfection.

reply to Whiskers
Those caps are definitely toast. The metal top should be perfectly flat.

Replacing them with 16V isn't a bad idea.

Also important is that the replacement capacitors are low-ESR (Equivalent Series Resistance). General purpose capacitors generally don't work so good in switchmode power supplies, and won't last as long.

It's unlikely Radio Shack will carry the correct capacitors, their selection is very limited.

You'll probably have to purchase the caps from an electronics parts supplier such as Digikey or Mouser (online) or a local electronics parts supplier if available in your area.

For good measure I'd replace all the caps in that section of the power supply. They're cheap (usually less than $1 per cap), and you don't know what state the other caps are in. Even though visually ok, they may have deteriorated a little.

reply to Whiskers
AND???

reply to Whiskers
Just so you know.. that "Slightly raised top" is the "Bulging" that others were talking about earlier.

Also I should point out that is most likely a multilayer board, So solider with care.

reply to kdpo1990

reply to Whiskers
When soldering, always remember it's 'heat' not 'pressure' that reflows your solder, enabling removal of the bad caps.

Good luck and update us on if it works!

reply to Whiskers
I have a Samsung LN-T4065F for about 3 years now and it is doing the exact same thing. It take 3 times for it to come on. Please post whether or not replacing the caps worked. I am would definitely like to know. Since Samsung has not done anything about this problem and has no plans to do anything they have definitely lost my business in my next television purchase.

reply to Whiskers
I have the same issue. I've gone to stores looking for the capacitors with no luck, the print on mine is V2A, 1000uf, 10 V. I do not know much at all about electronics and was wondering if this would be the correct one to purchase on-line..."Capacitor, Al Electrolytic; 1000uF; 16VDC; +/-20%; Radial; 10.0mmDia.; 20.0mmL; 20VDC;". What range would be considered a low-ESR? I read that 16V would be a safe replacement. Thank you!