Sony KDL-40S2000 T-Con - looking for help to ID SMD

[sansonet]

I have Sony KDL-40S2000 which powers on, got sound and blacklight, but screen all dark/gray and looks the same with t-con unplugged. When I visually inspected it, I found 1 burned SMD. Here is picture of good board
http://assets.shopjimmy.com/media/ca...070h-top_1.jpg
Burned component located on the bottom near cable connector above marking "CP101P", on shopjimmy pic SMD ilooks greenish and marked "P"
I found manual for codes and it looks like it might be KV1841E
Is it correct?
In this case, what substitutes I can use (looks like this one is hard to find), and what are chances that it will fix t-con?

[budm]

Re: Sony KDL-40S2000 T-Con - looking for help to ID SMD

CP101 = Circuit Protection = Fuse
I would check the board for shorted circuits, that can be difficult since the shorted load may connected to the power supply line due to electronics switch has to be turned on after power is applied. The fuse is probably 3~5A range, you can look up the LCD penal spec to see how much current it needs to run and the in-rush current spec.

[budm]

Re: Sony KDL-40S2000 T-Con - looking for help to ID SMD

According to SJ (http://www.shopjimmy.com/catalogsear...ny+KDL-40S2000), this T-CON board is used in LCD panels:
LTY400WS-L02
LTZ400WS-L02

The spec for LTY400WS-L02 show Max current is 2A, in-rush of 5A.
I would try 3A.

[sansonet]

Re: Sony KDL-40S2000 T-Con - looking for help to ID SMD

Thank you for responses!
I got some bad t-con/main boards with 3a marked smd fuses, they are bigger, but I think they should be OK to try?
I think ones like this, I see them mostly on vizio boards http://www.ebay.com/itm/like/170645377154

[budm]

Re: Sony KDL-40S2000 T-Con - looking for help to ID SMD

For testing you can get automotive fuse or any 3A fuse and just solder the wires to the ends of the fuse for testing for now.

[sansonet]

Re: Sony KDL-40S2000 T-Con - looking for help to ID SMD

I just finished soldering that littelfuse one from another board like on ebay link above, since its bigger, I extended contacts on board by scratching paint off, just tried it - and it worked! Got nice picture, but I didnt try it on long run yet, just for minute.
Is it OK to leave it with that fuse? Or I should try to find something else for permanent fix?

[budm]

Re: Sony KDL-40S2000 T-Con - looking for help to ID SMD

Try it like that for now to see how it will work, you will have to use the TV and turn it on and off every day to see if the in-rush current will blow the fuse or there is intermittent shorts in the panel or on the T-CON board.

[sansonet]

Re: Sony KDL-40S2000 T-Con - looking for help to ID SMD

How often I should turn it on off and when it will be safe to say there are no other problems? Also, should I test it by letting it run for while, or just by powering on/off?
This is what it looks like now

[budm]

Re: Sony KDL-40S2000 T-Con - looking for help to ID SMD

Just like everyday use.

[sansonet]

Re: Sony KDL-40S2000 T-Con - looking for help to ID SMD

Just like everyday use.

I not really use big flatscreens often myself I have small TV on kitchen that runs most of time while I do my work, and I turn on big ones only when I ready to sit down and watch some movie - for about 1 hour 1 time in day. It that will be enough or I should run it more often?

[budm]

Re: Sony KDL-40S2000 T-Con - looking for help to ID SMD

Are you keeping this TV? If it is yours then just use it as the way you use it in the past and see what happen. I cannot tell if the original or the new fuse is fast blow or not, I know that the green PICO is fast blow, the slo-blo PICO fuse has Yellow color.

[sansonet]

Re: Sony KDL-40S2000 T-Con - looking for help to ID SMD

No, not keeping it - just trying to fix it and make sure it will work like it should. That Littelfuse I used came from another T-con and it was located at the same place so it was mentioned for circuit protection too. Board marking - F1 125V/3.0A

[sansonet]

Re: Sony KDL-40S2000 T-Con - looking for help to ID SMD

I think I found original fuse on ebay too - should I try to get one of those or keep one I already installed? http://www.ebay.com/itm/10-Pcs-Litte...-/181210243072

[budm]

Re: Sony KDL-40S2000 T-Con - looking for help to ID SMD

OK, so it is 3A Fast blo, I would use that one you have installed then.
How did you find that fuse with 'P' on EBAY? You did good finding it.
BTW, was the green fuse that blew has the Amp rating on it?

[sansonet]

Re: Sony KDL-40S2000 T-Con - looking for help to ID SMD

I searched for "Littelfuse SMD 3A", it came up
I should be doing better inspection of my spare boards because I just found another t-con with that "P" fuse on it. So I went ahead and replaced it. Which was not so easy - those P fuses are like 1mm in size, and I had to unsolder it first. It looks little messy after all that double fuse installation, and on P fuse top solder was stripped during unsoldering, but bottom part is there, it got good connection and TV screen comes on.

[sansonet]

Re: Sony KDL-40S2000 T-Con - looking for help to ID SMD

BTW, was the green fuse that blew has the Amp rating on it?

I didnt see anything on fuse that blew, it was completely destroyed, I was able to see what it should look like only on shopjimmy pic.

I still not sure what I should do about testing TV after replacement - should I do burn in test like leaving it to work for few hours, or try power on/off few times in day? I can temporary use it in living room in place of my usual flat screen, but I only use TV in there for one hour in day.

[sansonet]

Re: Sony KDL-40S2000 T-Con - looking for help to ID SMD

I found something on screen that may be source of fuse blow. I was testing it for two days and it was working OK so far, but today I realized it has some spots on screen. So I took all apart to clean it and completely removed lcd panel just to find out that "spots" cant be cleaned, they in fact bubbled coating on the panel. All located near circuit board.

Obviously, they dont affect video signal because picture is nice, clear and with really good colors. But maybe something, like overheat happened in the past that caused it? Or something else? What are chances it will cause problems in the future? Those bubbles are not really noticeable because it took for me 2 days to find out about them, only because I was standing next to TV and there was solid background, from like 10 feet I cant even see it.

I ordered fuses to solder one properly after I'll get it, but now I not sure what I'll do with TV and whatever I should just take it apart and sell boards.

[sansonet]

Re: Sony KDL-40S2000 T-Con - looking for help to ID SMD

I hope somebody will respond this time - replacement fuse finally blew again, it happened when TV was on for ~2 hours and all of sudden screen went dark. Unlike first fuse, it doesn't look burned up, but no continuity contact anymore.
Since panel had that bubble with defect, I think it's best to just sell it for parts (except T-Con), but I want to be sure that problem is in T-Con or panel first and rest of board are OK.

[budm]

Re: Sony KDL-40S2000 T-Con - looking for help to ID SMD

It is hard to rule out for sure if the panel is drawing too much current or the T-CON circuit itself is drawing too much current and caused the fuse to blow.

[sansonet]

Re: Sony KDL-40S2000 T-Con - looking for help to ID SMD

Do you mean rule out T-Con, or main and power boards? I'm trying to find out if problem is localized in t-con/panel only, and whatever anything could be wrong with other boards on TV.