Samsung LN46C530F1FXZA Dead Set No Standby

[fharris1977]

Hello. I have a Samsung set that a customer says went out during a power outage or surge. From a visual inspection I see a burn mark on one of the transformers (pics included). Also, when I replace the pictured fuse (the one by the power plug connector) it blows immediately when I plug in the set. Could the transformer be the issue why the fuse immediately blows or could it be something else. I'd greatly appreciate any help. Thanks in advance.

[budm]

Re: Samsung LN46C530F1FXZA Dead Set No Standby

That T3 fuse is used for feeding B+ to the inverter circuit and the standby power supply circuit.

You need to test MOSFET's QI802, QI808, and SMPS IC ICM801(you need to get the P/N of this IC to be able to look up the spec sheet for the pin out of the IC) for low resistance readings between Source and Drain pins.

BTW, the main filter cap CP802 looks like it has domed top, is that correct?

Power supply/inverter board P/N BN44-00418A.

[fharris1977]

Re: Samsung LN46C530F1FXZA Dead Set No Standby

Hi thanks. The fuse that keeps blowing is the t6.3ah 250v not the t3. Just was clarifying that in case that's why you want me to test those mosfets and ic. And yeah you're right that filter cap is bulged. For some reason I couldn't see that until I looked at the picture. Do I still need to test those mosfets and ic?

[budm]

Re: Samsung LN46C530F1FXZA Dead Set No Standby

Hi thanks. The fuse that keeps blowing is the t6.3ah 250v not the t3. Just was clarifying that in case that's why you want me to test those mosfets and ic. And yeah you're right that filter cap is bulged. For some reason I couldn't see that until I looked at the picture. Do I still need to test those mosfets and ic?

I mean T3.15A rated fuse (FS802S designator) as shown in your picture, I just did not write down the whole thing.
Yes, you do need to test all those parts I mention, and both filter caps need to be replaced.
You may want to look if it will be cheaper to buy the board.