Samsung 930b LCD cold start problem (inverter?)

[pregep]

Re: Samsung 930b LCD cold start problem (inverter?)

Quick necro for this old thread just to say thank you, especially to PlainBill

I've used this helpful guide and suggestions to repair powerboard on friend's Samsung 930BF. Changed total of three bulged capacitors:

3pcs. 820uF/25V -> 3pcs. 1000uF/25V

...and also changed dead fuse at position F301.

Thanks once again and cheers from Serbia!

[Levitator]

Re: Samsung 930b LCD cold start problem (inverter?)

I had one swollen 820uF capacitor, so I replaced all three 820s and wound up with the infamous hissing noise and a flickering display. I want to concur that it really does look like you need to replace all the caps.

[budm]

Re: Samsung 930b LCD cold start problem (inverter?)

Hissing noise can be from high Voltage arcing due to inverter transformer is breaking down, bad wiring on the lamp assemblies, etc.

[Levitator]

Re: Samsung 930b LCD cold start problem (inverter?)

Hissing noise can be from high Voltage arcing due to inverter transformer is breaking down, bad wiring on the lamp assemblies, etc.

There's a guy who posted here by the name of "demens", who had the same problem. He did a partial recap and wound up with a hissing sound, which he fixed by replacing the rest of the caps, so I am holding out some hope that cap replacement will fix the problem.

[momaka]

Re: Samsung 930b LCD cold start problem (inverter?)

There's a guy who posted here by the name of "demens", who had the same problem. He did a partial recap and wound up with a hissing sound, which he fixed by replacing the rest of the caps, so I am holding out some hope that cap replacement will fix the problem.

Well, nest give it a try and see. After all, it's best to take care of the simple stuff first (i.e. replacing the caps), before doing anything else.