Samsung LN32C540 Standby Light Only

[newtothis]

Re: Samsung LN32C540 Standby Light Only

just getting a schematic of the board.....

[tom66]

Re: Samsung LN32C540 Standby Light Only

Panel model only applicable for main boards. Power boards just verify it was used in a 32" and that connectors are the same.

Schematic

[newtothis]

Re: Samsung LN32C540 Standby Light Only

Can you check what cap is at CM853

[newtothis]

Re: Samsung LN32C540 Standby Light Only

Tom is right, Most PSU's can be interchanged with slight varients as long as the output and connectors match.

All depends on if you want to repair the PSU is simply replace

[aaronwt6]

Re: Samsung LN32C540 Standby Light Only

I went ahead and got a board. $38 shipped. Version A. Fingers crossed that it will work. My model number is on the list of compatible versions so hope it works.

[aaronwt6]

Re: Samsung LN32C540 Standby Light Only

Hey newtothis. I'm going to have to run again but I will pick back up on this again later to learn and have a spare.

CM853 is a 25V 1000uf

[newtothis]

Re: Samsung LN32C540 Standby Light Only

schematic says 10v 2200uf

Id definately check all the caps against the schematic to make sure no others are incorrect.

Its no wonder the damn thing doesnt work!

can always repair the board and sell it reconditioned once working to pay toward the new one

This time I bet my life that changing the caps sorts it LOL

[tom66]

Re: Samsung LN32C540 Standby Light Only

Manufacturers can change parts mid way through a run and often that is what leads to the difference between "A" and "B" boards. The design may have been found to work better with 25V 1000uF or vice versa.

[aaronwt6]

Re: Samsung LN32C540 Standby Light Only

Whoever did the replacement put 1000uf's in CB851, CM853, CM854, CM858, and CM859. And 2200uf's in CM851 and CM852

[aaronwt6]

Re: Samsung LN32C540 Standby Light Only

Manufacturers can change parts mid way through a run and often that is what leads to the difference between "A" and "B" boards. The design may have been found to work better with 25V 1000uF or vice versa.

Ah. Noted.

[newtothis]

Re: Samsung LN32C540 Standby Light Only

Tom would that many really be changed?

851 852 are marked up at 1000uf

sure the person repairing it didnt get mixed up somwhere?

seems like a lot of variables to change

[tom66]

Re: Samsung LN32C540 Standby Light Only

Probably not. Any more than a few changes would most likely result in a new revision, e.g. "C".

[newtothis]

Re: Samsung LN32C540 Standby Light Only

OK I am still newtothis.. excuse the pun.... but from what I have learnt having a lower microfarad capacitor in way of those lines is probably the culprit for low power outputs, dont have enough capacitance?

Seems to fit with the output readings to me

[tom66]

Re: Samsung LN32C540 Standby Light Only

Not usually - actually quite often you can get away with lower capacitance. The main problem is ESR, which is a different property. Generally though ESR is lower with higher capacitance, so you may sometimes see more capacitance than would be strictly necessary (with perfect zero esr caps.)

[newtothis]

Re: Samsung LN32C540 Standby Light Only

Ok so if the caps have a higher series resistance could this act in way of the lines creating lower outputs?

[tom66]

Re: Samsung LN32C540 Standby Light Only

Yes, but from what I read they were talking about the button board, 3.3V is completely expected there due to the processor IO operating on 3.3V. Industry standard voltage 3.3V.

[aaronwt6]

Re: Samsung LN32C540 Standby Light Only

Update on this. Ordered one power supply which showed up dead (only had 10-11V coming out to the backlight inverter). Got a 2nd one and the set is up and running. I'm putting the old one in the junk box for now and my look at it more later if I have time. Too many other projects to deal with right now.

Thanks as always,

Aaron

[fuxxy]

Re: Samsung LN32C540 Standby Light Only

Friends parents have this same set with the same (no power, solid red light, unresponsive touch buttons) what all is involved to "pull up" ps_on?