T240 Samsung, Wont turn on

[Pepper]

Hi,

I had 3 dead monitor, fixed two the vp930b and the vx1932wm all thanks to this forum
and now for this last one
the Samsung T240
few weeks ago i decided to shut down my pc but when i tried to turn back on several hours later, the monitor won't lit up,

I rule out the "2 seconds to blackness" since there's not even half a second letting me turning it on. only once a while when i tried to turn it on, the red led will lit up for less than half a second.

Nothing is showing on the screen, so i have no idea what's wrong with it
after i did some googling and some youtubes videos
i decided to pop it open

i studied a few thread saying
it's either
a) bad caps
b) bad ccfls
c) bad ccfl wiring (especially the return wiring)
d) bad secondary windings on the inverter transformer


which in my case
the first thing i see are the Bad yellow cap from sam young
so my first option would be replacing all the caps
problems, because some of the white glue or paste are on the way and how the caps was placed,
i have no idea how to identify them

I know the Yellows are 1000uf 10v which i might replace it with 1000uf 16v or 25v

aside from that which caps should i be replacing, should i replace all? including the small one?

hopefully the problems only stay with the bad caps and nothing else

thanks in advance, help is much appreciated.

[cheapie]

Re: T240 Samsung, Wont turn on

Those yellow caps are almost certainly the problem.

This, this, this, or this should work. You'll need to measure the physical size of the old caps to see which will fit. Of course, you could use a different brand with the same specs if you wanted to.

Now, while likely only the bulged caps are bad (yet), it is a very good idea to replace every lytic cap on the board. If you can tell us the markings on the others, we can suggest replacements for those as well.

[Pepper]

Re: T240 Samsung, Wont turn on

Those yellow caps are almost certainly the problem.

This, this, this, or this should work. You'll need to measure the physical size of the old caps to see which will fit. Of course, you could use a different brand with the same specs if you wanted to.

Now, while likely only the bulged caps are bad (yet), it is a very good idea to replace every lytic cap on the board. If you can tell us the markings on the others, we can suggest replacements for those as well.

the problem is the cap placement, i can't seems to be able to identify them but ill try my best

(from top left to bottom right in order)
Twin black next to yellow are 820uf 25v

smaller black solo next to twin black is 330uf 10v

mini black with white paste allover it is 3.3 uf 50v

Yellow caps are 1000uf 10v

another small one near the heat sink(top) i have no idea but it's (41uf)?50v i have no idea, the white paste is covering it and the distortion of the plastic distorted it, so im not sure if its 41uf or 4.1uf
what's the white paste for anyway? all monitor seems to have it.

twin blacks near the inverter are also 820uf 25v

do i need to replace the big cap(W7A) too? the info is blocked, i cant seems to find any text accept a half cropped 150uf or 750uf

should i pay any attention to the small white cyclinder shaped thing with both end wrap in metal? it is near the power in plug at the top right potion of the picture(refer to post 1)

nonetheless once i get all accurate caps spec i will replace them with either rubycon or panasonic

[selldoor]

Re: T240 Samsung, Wont turn on

Hi - White cylinder is a fuse - test it meter on ohms 200.
There is another green one at F301 just under the heatsink in your picture.
Not many 41uf 50v caps about it will be 47uf 50v
You do not need to change the BIG cap unless it is bulged or leaky.

[Pepper]

Re: T240 Samsung, Wont turn on

Hi - White cylinder is a fuse - test it meter on ohms 200.
There is another green one at F301 just under the heatsink in your picture.
Not many 41uf 50v caps about it will be 47uf 50v
You do not need to change the BIG cap unless it is bulged or leaky.

i'd just noticed my inverter transformer is tm-09175
but a lot of other thread mentioning about TM-10160 instead.

when i look into it, some mentioned tm-09175 is not available anymore

[selldoor]

Re: T240 Samsung, Wont turn on

Well first thing would be to test it. If you need help locating the secondary winding joints
post a good clear pic of the back of the board

[selldoor]

Re: T240 Samsung, Wont turn on

Have a look at these two links shows the secondary and tells what ohms

http://www.lcdparts.net/TransformerD...ProductID=3699



http://www.lcdparts.net/TransformerD...ProductID=3696

[Pepper]

Re: T240 Samsung, Wont turn on

Have a look at these two links shows the secondary and tells what ohms

http://www.lcdparts.net/TransformerD...ProductID=3699



http://www.lcdparts.net/TransformerD...ProductID=3696

i am a newbie in this, so i dont have the meter, i dont know how to test em and i dont understand what's ohms D:
, and
i had already ordered the capacitors, hopefully it will arrive within 4 days
and for the transformers, issit only available in ebay? most of the inverters are in china


i wonder, if the capacitor is 330uf 10v
can i replace them with either 330uf 16v and 330uf 25v, right?
the volts, does it affects anything, i know it's the limit of the volts and high volts is better but let say the original is 10v, i can replace it with a 50v?

[klkmalik]

Re: T240 Samsung, Wont turn on

Thank u for interest. You must to learn Basic electronic.you have to take hand on training from experience person. When u changing caps. don't forget to resolder to invertor with ballast cap.

[selldoor]

Re: T240 Samsung, Wont turn on

Pepper - I am sorry but it will be impossible (and dangerous) for us to try and help you
as kikmalik says you need at least a basic knowledge and basic tools. Answers to all you are asking are within these forums and on the internet.

wonder, if the capacitor is 330uf 10v
can i replace them with either 330uf 16v and 330uf 25v, right? YES

he volts, does it affects anything, i know it's the limit of the volts and high volts is better but let say the original is 10v, i can replace it with a 50v?

IF nothing else was available and it would physically fit you could - it is usual to stick to 1 step above.

[Pepper]

Re: T240 Samsung, Wont turn on

Thank u for interest. You must to learn Basic electronic.you have to take hand on training from experience person. When u changing caps. don't forget to resolder to invertor with ballast cap.

Pepper - I am sorry but it will be impossible (and dangerous) for us to try and help you
as kikmalik says you need at least a basic knowledge and basic tools. Answers to all you are asking are within these forums and on the internet.

wonder, if the capacitor is 330uf 10v
can i replace them with either 330uf 16v and 330uf 25v, right? YES

he volts, does it affects anything, i know it's the limit of the volts and high volts is better but let say the original is 10v, i can replace it with a 50v?

IF nothing else was available and it would physically fit you could - it is usual to stick to 1 step above.

i am wholeheartedly agree with learning from experienced people but i have no one to teach me but the internet, ill try to search for answer and follow experience.
ill see what'll to do when the caps arrive and hope i wont need to replace the inverter transformer

P.s. what's a ballast cap? i tried googling but i dont quite understand wht it is

[retiredcaps]

Re: T240 Samsung, Wont turn on

i am wholeheartedly agree with learning from experienced people but i have no one to teach me but the internet, ill try to search for answer and follow experience.

I started learning electronics 3 years ago and a lot of my knowledge came from PlainBill. Start by searching for his posts here and read them.

[Pepper]

Re: T240 Samsung, Wont turn on

my monitor repairing has come to an end
i fixed the samsung t240 by replacing all the caps on the PSU
thank you guys so much