Vizio LP2626 CCFL problems

[skyliner]

Hi everybody, i am having a few problems with ccfl knowledge, so i registered to Badcaps.

A few days ago my Vizeo Lp2626 turned off and started smoking out the top(according to the person using i at the time). so i took it to a repairman, and he replaced a few caps, and said a ccfl was burned out. We asked around abit more, but nobody would repair it. So being the fixit man i wish i was, i took it apart and located the ccfls. Ihave a few problems though.

-I dont know which one is burned out. there are 4, 2 top 2 bottom. There are small grey rings near the ends of each light, could all of them be burned out? I do have access to a multimeter, maybe i could test them that way. but i have no idea which settings to put it on.

this brings me to my next question,

-after i find which ccfl is burned out, what size do i buy? I dont have access to a caliper, so i cant find the diameter. does anybody know what size this specific TV uses?

-i have read around and hear that inverters can go bad aswell as ccfls. The guy i had look at it said he replaced some caps, does this mean the inverter is fine?


I am way in over my head, so any advice is appreciated.

thanks!

Oh, if this is in the wrong sub-forum I apoligize and any mod may move it if they want.

[Dgtech]

Re: Vizio LP2626 CCFL problems

If you can find the same exact lamps, you'd be ok. HOWEVER... it's gonna be next to impossible to do so. Give up on it and cut your losses. It's only a 26 inch anyways.

[drpj23]

Re: Vizio LP2626 CCFL problems

http://www.lcdparts.net

.....but if it is 2 grouped together shining down (instead of at you) then I may be with Dgtech.

But inverters do fail a lot more often than CCFLs do.
The repair shop is a bit confusing to me, as in I do not understand how caps went to CCFLs.
There may be caps on the inverter board that failed and he replaced them but the only TV to my experience of ever needing CCFLs is Sharp.
Vizio has always been broken bulbs (however in the world that happens) but more often than not on any TV with backlight failure....caps on power supply (.Vizio though uses good p/s....well I have seen bad ones under 32"), components on inverter (possibly caps but really those high voltage transformers) and lastly the main board not telling the inverter to actually cut on.
There is no way to test those CCFLs but with the TV working.
If you want to try to repair it, include pictures of the boards, especially the inverter and power supply.

[budm]

Re: Vizio LP2626 CCFL problems

Common failure in this model is due to burnt up ballast caps:
http://s807.photobucket.com/albums/y...t=DSC04118.jpg

http://s807.photobucket.com/albums/y...cpZZ1QQtppZZ20

[skyliner]

Re: Vizio LP2626 CCFL problems

http://www.lcdparts.net

.....but if it is 2 grouped together shining down (instead of at you) then I may be with Dgtech.

It is the case with my screen, but what makes them harder to find?

Common failure in this model is due to burnt up ballast caps:
http://s807.photobucket.com/albums/y...t=DSC04118.jpg

http://s807.photobucket.com/albums/y...cpZZ1QQtppZZ20

I dont think its a burned ballast, i checked the cards and nothing looks burned


i am attaching a few pics
the only thing that i could see possibly being a problem is a piece that seems to be missing circled in red.

[budm]

Re: Vizio LP2626 CCFL problems

That is one of the four lamp connectors, you do not have all 4 working lamps connected, the circuits will shutdown within 3 seconds, the circuit must detect all 4 lamps has fired up and stay conducted within 3 seconds, it will also shutdown if the lamps or the circuits draw too much current, it will only take one lamp to be bad or not connected for the circuit to shutdown. Who would have removed that important part from the board?
And those 4 BROWN ballast caps do not look right, can you the numbers printed on the body? They look like they have been replaced I can see flux on the bottom side of the board where the ballast caps are, they are not the original caps.

[skyliner]

Re: Vizio LP2626 CCFL problems

uhhm, do you know what the missing piece # and stuff is so i can buy a new one? unless you think its shot and the board is damaged.

the #'s on the brown caps are:
12J
NPO
3KV

and the opposite side says "mexico"

[budm]

Re: Vizio LP2626 CCFL problems

Lets find out what else is missing, there should be 4 lamp connectors from the lamp assemblies, are they all still there?
And by the way, 2 of the caps should have 12j, and another 2 should have 3j on them, they CANNOT be the same value
http://s807.photobucket.com/albums/y...t=DSC04108.jpg

http://s807.photobucket.com/albums/y...t=DSC04120.jpg

[skyliner]

Re: Vizio LP2626 CCFL problems

Fail on my part, the missing part was pulled off when i pulled the connectors apart. it stuck to the opposite part of the connector.

2 of the caps are right with the 12j, but i guess 2 need to be replaced again. could you link me to somewhere that sells the one you suggested with the 3j-npo-3kv?

[budm]

Re: Vizio LP2626 CCFL problems

3pf 3000V is hard to come by: no body stock them
http://www.digikey.com/scripts/dksea...ity=0&PV13=171
So the original ballast caps burnt up and they replaced them all with the same value.

[drpj23]

Re: Vizio LP2626 CCFL problems

That makes a bit more sense.....forgot about those caps.

[ecking767]

Re: Vizio LP2626 CCFL problems

I have this LCD TV and I had a bad output transistor, U501 and U502. CCFLs will glow red if bad or will be cracked.

[skyliner]

Re: Vizio LP2626 CCFL problems

3pf 3000V is hard to come by: no body stock them
http://www.digikey.com/scripts/dksea...ity=0&PV13=171
So the original ballast caps burnt up and they replaced them all with the same value.

Since they are hard to come by, apparently aswell as the ccfls. should i just scrap this whole project? or is it worth going to the trouble?

[budm]

Re: Vizio LP2626 CCFL problems

I just found this at Mouser, 3 pf 4000V.
http://www.mouser.com/ProductDetail/...zlflv4s41XU%3d

[Jonny Accelerant]

Re: Vizio LP2626 CCFL problems

uhhm, do you know what the missing piece # and stuff is so i can buy a new one? unless you think its shot and the board is damaged.

the #'s on the brown caps are:
12J
NPO
3KV

and the opposite side says "mexico"

I'm currently working on this same board and although this thread is old, there is a warning I think that must be posted.

First this is a classic case of who to NOT trust with your electronics repair, as, in addition to losing, removing or breaking the absolutely necessary lamp socket thing (in red box with arrow), the "repairman" may also have replaced the caps with the wrong ones, as those 4 brown caps are NOT all the same. This old thread doesn't say if they are or are not replaced with the same caps, but the caps on the right side are a "matched" pair, one of which has the specs described above, and the caps on the left side are "symetrical" as a matched pair of the same two (different to each other) caps. I haven't got the values, but I wanted to warn anyone else reading this thread that the problem is not a simple matter of replacing 4 caps with the same cap. There are 2 caps of one spec, and 2 caps of another, if one is going to replace all 4 of them.

The thread doesn't tell us how it all ends, but my prediction is that the OP scrapped the monitor, which is unfortunate because my instinct is that the monitor was either repaired by the cap replacement, but then broke by the missing CCFL power socket, or the caps could have been replaced by the correct caps and a new CCFL power socket. (I'm calling it a "power socket". It's probably got a better, more technical name.)

Thing is, he paid to have the shop break it, and then they lied and told him his CCFL was "bad". Those wires are hard to remove. The whole monitor is a PITA to get into. You need firm and gentle pressure, and you need to wiggle those plugs back & forth, side to side and maybe help them along with a screwdriver or something. It's possible that a hot cap melted the plastic. Either way, the shop lied, as you can't possibly know enough to replace capacitors and not know that the missing socket is going to cause problems.

[budm]

Re: Vizio LP2626 CCFL problems

My post #8 indicates what the value should be + the link to my pictures.

Lets find out what else is missing, there should be 4 lamp connectors from the lamp assemblies, are they all still there?
And by the way, 2 of the caps should have 12j, and another 2 should have 3j on them, they CANNOT be the same value
http://s807.photobucket.com/albums/y...t=DSC04108.jpg

http://s807.photobucket.com/albums/y...t=DSC04120.jpg

12pf:
http://www.mouser.com/ProductDetail/...1IlTe5LtlVc%3d

http://www.mouser.com/ProductDetail/...0LsS%2fqhbo%3d

3pf:
http://www.mouser.com/ProductDetail/...zlflv4s41XU%3d