Samsung LN32A450 LCD TV popped when plugged in

[shelby5041]

hi
my neighbor gave me this LCD tv...he said would not power on

i plugged it in and immediatley heard a pop and smoke so i unplugged it

took tv apart and saw visually that 1 blue cap was fried...see photo photo is stock photo from shop jimmy

anyone know what would cause this and can i just use a standard capacitor as replacement?

the part is circled in red..see stock photo

i believe the initial no power on is due to a different bad cap that is bulged but not sure why the blue cap fried as soon as i plugged tv in...

[nomoresonys]

Re: Samsung LN32A450 LCD TV popped when plugged in

Identify the 2 caps Cxxx? pictures would be helpful.

[shelby5041]

Re: Samsung LN32A450 LCD TV popped when plugged in

i posted photo with cap that fried circled in red and the bulged cap is at CM856( which i believe is the initial no power on issue)

just yrying to find out why the blue cap fried as soon as i plugged tv in after tv was given to me due to no power on.

[budm]

Re: Samsung LN32A450 LCD TV popped when plugged in

That is commonly failed snubber cap, rated at 1KV, you should replace it with 2KV cap rating.

[shelby5041]

Re: Samsung LN32A450 LCD TV popped when plugged in

here is actual pic of my board..the cap fried as well as the jumper next to it

[budm]

Re: Samsung LN32A450 LCD TV popped when plugged in

You need to remove all those bad brown glues, they are conductive.

[shelby5041]

Re: Samsung LN32A450 LCD TV popped when plugged in

hi bud...well i just find it odd why did it get fried as soon as i plgeed the tv in..it didnt fry for the guy who gave tv to me....initial issue was tv would not power on..which i believe has nothing to do with this blue cap issue ..im trying to find why?...

[neilc6]

Re: Samsung LN32A450 LCD TV popped when plugged in

https://www.badcaps.net/forum/showthread.php?t=67743

[budm]

Re: Samsung LN32A450 LCD TV popped when plugged in

That is high Voltage section, so the glue finally conducts enough to cause problem, nothing new about those bad glues, it is also corrosive and it will eat component leads and copper traces.
See what kind of damages bad glue will cause: https://www.badcaps.net/forum/showth...ight=bad+glues

[shelby5041]

Re: Samsung LN32A450 LCD TV popped when plugged in

ok thanks..just find it odd why it did it when i plugged tv in..just coincidence? that after 10yrs of use.it never fried....tv then stopped working due to bulged cap and guy gives me tv and on that exact time when i plug tv in it pops..??? seems a little odd but from what you are saying it could be right ...very odd though as far as timing is all im saying...thyansk for the link neil and bud seems there may be more issues with this board then initially thought....replacing the blue cap more than likely will not fix the issue..i will c if a replacement board can be found under$20..i do not spend more than $20 on tv repair anymore cine tvs are worthless nowadays

[nomoresonys]

Re: Samsung LN32A450 LCD TV popped when plugged in

Replace those 2 caps, clean up the glue and give it a go.

[shelby5041]

Re: Samsung LN32A450 LCD TV popped when plugged in

i dont have any of those type caps..all i have is can type caps..is there anyhting i can use as a substitute just for testing purposes?

[shelby5041]

Re: Samsung LN32A450 LCD TV popped when plugged in

i have a 470uf cap for the bulged cap..but i dont have any of the blue style caps..is there anyhting i can use as a sub for testing purposes?

[budm]

Re: Samsung LN32A450 LCD TV popped when plugged in

Just check the resistance of the blue cap to see if it is actually shorted out or not, the failure mode of those ceramic caps are shorted circuit.
But you must remove all the glues first, replace the blown jumper wire, check the MOSFET's on that heatsink to make sure they are damaged.

[shelby5041]

Re: Samsung LN32A450 LCD TV popped when plugged in

ok thanks bud will check...the legs are fried but the body seems visually ok...test whil;e its on the board? i have the board out of tv now...is it safe to test?..seems to be no continuity between cap legs

[shelby5041]

Re: Samsung LN32A450 LCD TV popped when plugged in

thanks guys.....i removed the glue..replaced the blown jumper..resoldered in the original blue cap...replaced the bulged cap and now tv powers on fine...saved another tv from landfill

you guys are awesome

[nomoresonys]

Re: Samsung LN32A450 LCD TV popped when plugged in

Good job.

[budm]

Re: Samsung LN32A450 LCD TV popped when plugged in

Thanks for feedback.