Samsung LN37D567F9HXZA dead power supplies, blown fuse

[crushkittykitty]

Re: Samsung LN37D567F9HXZA dead power supplies, blown fuse

here is the mosfet

[crushkittykitty]

Re: Samsung LN37D567F9HXZA dead power supplies, blown fuse

the other 2 power supplies same... here are the mosfets from them. So now to find some replacement parts. should I check anything else ?

[budm]

Re: Samsung LN37D567F9HXZA dead power supplies, blown fuse

CHN 131 is probably manufacturing plant code, date code, etc. CHN may be = China.

[crushkittykitty]

Re: Samsung LN37D567F9HXZA dead power supplies, blown fuse

CHN 131 is probably manufacturing plant code, date code, etc. CHN may be = China.

I seen some with Mar but most i have seen have chn I think you are correct

will these work? http://www.ebay.com/itm/10pcs-STF13N...-/252464607828

[dick_barton]

Re: Samsung LN37D567F9HXZA dead power supplies, blown fuse

here is the mosfet

The schematic says it's an STF13NM60N made by STMicroelectronics and available from Mouser and several other suppliers.
Check any diodes/zener diodes located near QP801S and for damaged capacitors before you replace the mosfet.

[petehall347]

Re: Samsung LN37D567F9HXZA dead power supplies, blown fuse

looks like they might be overheating because of all that silicon ..its only supposed to cover the legs to stop dust . or maybe the heat-sink isnt flat or paste dried up .

[crushkittykitty]

Re: Samsung LN37D567F9HXZA dead power supplies, blown fuse

looks like they might be overheating because of all that silicon ..its only supposed to cover the legs to stop dust . or maybe the heat-sink isnt flat or paste dried up .

They have no paste on them, but I think you might be on to something there funny they all failed the same time. I figured it was a lighting strike or voltage spike at the hotel.

So far i have seen about 10 tvs from there these are all the same tv. The first ones were main boards, 2 had broken screens, The rest are all power supplies.

I am looking at the back of the boards now
going to compare them from a known good supply
I do see some issues on one of the other power supplies I will post pics got to take them all outside to get good pics

[petehall347]

Re: Samsung LN37D567F9HXZA dead power supplies, blown fuse

i guess they are all same age and similar usage so that might be why they all died at same time ..unless they all went bang at exactly the same time then a power surge is more likely .

[crushkittykitty]

Re: Samsung LN37D567F9HXZA dead power supplies, blown fuse

i guess they are all same age and similar usage so that might be why they all died at same time ..unless they all went bang at exactly the same time then a power surge is more likely .

finally got the good supply out (family is sick)
how do i find surface mount parts like at digikey?
comparing the 2 power supplies this caught my eye

[petehall347]

Re: Samsung LN37D567F9HXZA dead power supplies, blown fuse

i cant make out exactly what you are referring to

[crushkittykitty]

Re: Samsung LN37D567F9HXZA dead power supplies, blown fuse

RP813 68ohmJ 3216
rp814 30ohmJ 3216
these test bad
db802 KDS184 tests fine
I suppose this means that the chip (up801)(SCY99096A) is bad as well I have
no idea how to test it. (will be my project today google it)

I can find parts but they are all in china and a 100 at a time though free shipping and cheap lol
no doubt poor qaulity
still at a loss how to find parts

sorry re-posted the pictures with the spot highlighted better

[petehall347]

Re: Samsung LN37D567F9HXZA dead power supplies, blown fuse

if qp801s is shorted then that is what blew those resistors ..
looks to me like up801 drives the gate on qp801s

[budm]

Re: Samsung LN37D567F9HXZA dead power supplies, blown fuse

That PFC IC is toasted due to high Voltage dump into the Gate drive output pin of the IC when shorts is between Drain and Gate, that is why I always recommend to replace the IC and the MOSFET at the same time + any damage parts in the Gate drive circuit.

[crushkittykitty]

Re: Samsung LN37D567F9HXZA dead power supplies, blown fuse

That PFC IC is toasted due to high Voltage dump into the Gate drive output pin of the IC when shorts is between Drain and Gate, that is why I always recommend to replace the IC and the MOSFET at the same time + any damage parts in the Gate drive circuit.

can you circle the parts that you are talking about sorry been sick for 2 days now and have med head :\ or we might have to wait till I can think clearly

[dick_barton]

Re: Samsung LN37D567F9HXZA dead power supplies, blown fuse

UP801 shown in box

[crushkittykitty]

Re: Samsung LN37D567F9HXZA dead power supplies, blown fuse

thanks that is what I thought so i will add it to the list. lol the list is growing you guys are the best .

[vinceroger69]

Re: Samsung LN37D567F9HXZA dead power supplies, blown fuse

up801 part number you already have is in post 31 youy may find all these parts on digikey/mouser etc maybe a more experienced mamber will kindly help you with the links for the parts you need as i have trouble choosing the correct part size and watts etc

[dick_barton]

Re: Samsung LN37D567F9HXZA dead power supplies, blown fuse

SMD resistor size table
http://www.learnabout-electronics.or...sistors_07.php

[vinceroger69]

Re: Samsung LN37D567F9HXZA dead power supplies, blown fuse

SMD resistor size table
http://www.learnabout-electronics.or...sistors_07.php

thanks for the link added too my bookmarks page

[crushkittykitty]

Re: Samsung LN37D567F9HXZA dead power supplies, blown fuse

SMD resistor size table
http://www.learnabout-electronics.or...sistors_07.php

added as well

This is were i am at right now, drinking coffee today and not sick
first have to order a microscope. prolly just get all the parts at one place need to look at the other 2 now and resolder back in the good parts on this one. Going to wait to get parts for all 3 plus if its all the same I will just get some extra.

hopefully the cost is less then getting one of fleabay. I would really like to fix them.