Samsung LN 40D630 TV - No Power

[jason123]

Re: Samsung LN 40D630 TV - No Power

Any thoughts on this folks?? Would the IC replacement resolve the problem? Any schematic someone could share so I can figure out what the bad part is?? Thanks!

[CapLeaker]

Re: Samsung LN 40D630 TV - No Power

what is written on that IC?

[jason123]

Re: Samsung LN 40D630 TV - No Power

Ok, got the better scope, and the part number is STR W6052S
Looks like datasheet is:

https://cdn.badcaps-static.com/pdfs/...d55e88614f.pdf

I am not getting any voltages on any of the pins. No VCC voltage

Hi CapLeaker - it's the STR W6052S

[budm]

Re: Samsung LN 40D630 TV - No Power

So the new fuse did blow, so you need to verify for sure that resistor RM811 is still good or not and then replace the IC.

[jason123]

Re: Samsung LN 40D630 TV - No Power

So got the new IC today.. installed it, replaced the fuse, double checked the value of RM811.. upon applying power violent sparking took place in the hot side from component MI802S. See photos.

[nomoresonys]

Re: Samsung LN 40D630 TV - No Power

Take out fet MI802S and test it?

[budm]

Re: Samsung LN 40D630 TV - No Power

So you replaced SMPS IC UM801S mounted on the heatsink for the standby power supply and now you also has blown MOSFET's for the Inverter transformer driver circuit. At this point you may want to get new board.

[jason123]

Re: Samsung LN 40D630 TV - No Power

Oh i got a new board.. i was hoping to salvage this one but at this point sounds too involved. Thanks

[jason123]

Re: Samsung LN 40D630 TV - No Power

Take out fet MI802S and test it?

The FET has holes in it. .charred

[nomoresonys]

Re: Samsung LN 40D630 TV - No Power

Hmm, self destructed or something else blew it?

[jason123]

Re: Samsung LN 40D630 TV - No Power

it's got to be something else shorted or .. who knows