Need information about CCFL's

[johnboy1313]

I'm new to this and recently picked up a Sanyo DP42848 with the 2 seconds to black issue. I have found two bad CCFL's but the electrodes on the ends of my bulbs look different than any that I can find online. My bulbs have a metal cap on the end that slides into a spring clip, while the ones I see online have no cap, but have a thin electrode sticking out of the end.

My bulbs



The ones I see online


There is a slot at the end of the clip that holds my bulbs that looks like it might accept the electode shown in the second pic. I don't have the experience to know if they're compatable or not. Any help would be greatly appreciated.

[kc8adu]

Re: Need information about CCFL's

how did you determine they are bad?
more likely to be in the inverter.
as for the lamps they should work if the clips bite the leads ok.if not i would solder.
if 2 are actually bad i would replace all.

[johnboy1313]

Re: Need information about CCFL's

how did you determine they are bad?
more likely to be in the inverter.
as for the lamps they should work if the clips bite the leads ok.if not i would solder.
if 2 are actually bad i would replace all.

There's 18 bulbs in there. At 24 bucks a piece, that's $432. The same TV can be bought for $500 brand new right now.

I could solder them in there. I hadn't thought of that. Thanks.

[selldoor]

Re: Need information about CCFL's

If the bulbs are not too difficult to remove you could test the ones thought to be bad by substitution, to make sure its not just the connection/wiring.

[tom66]

Re: Need information about CCFL's

It is also possible, although perhaps "dodgy", to disable the error detection and live with the bad bulbs...

[mattpd]

Re: Need information about CCFL's

Before I spent $50 I would do what selldoor said and switch one of the good ones into the bad ones place to make sure its not the inverter circuit. Every time I have had a bad CCFL it was obviously burnt or darkened on the end.

[johnboy1313]

Re: Need information about CCFL's

Before I spent $50 I would do what selldoor said and switch one of the good ones into the bad ones place to make sure its not the inverter circuit. Every time I have had a bad CCFL it was obviously burnt or darkened on the end.

I will try that. One of the two bulbs is obviously bad. The other has no signs of being bad at all, other than it won't light. I had already planned on swapping that one out before I bought a replacement.

[ecking767]

Re: Need information about CCFL's

[IMG]
There's 18 bulbs in there. At 24 bucks a piece, that's $432. The same TV can be bought for $500 brand new right now.

I could solder them in there. I hadn't thought of that. Thanks.

I agree with you, its not cost effective to buy new lamps. Are those lamps are out of a LG panel?

if yes check out this website after you test the lamps in question.

http://www.ernestos-electronics.com/...3-4mm-x-960mm/

you may need to take an measurement


ecking767

[budm]

Re: Need information about CCFL's

Did you try this place?
http://www.ccflwarehouse.com/
So by the way, the lamps will still stay on without going into shutdown, 2-second to black.
And by the way, this TV does not use a bunch of Inverter transformers (I.E. one transformer per 2 lamps), it has one-pair transformers that drive ALL the lamps through individual ballast cap for each lamp, so if the inverter is bad ALL the lamps will not come on, but bad ballast cap can cause single lamp not to work or one bad individual lamp.

[johnboy1313]

Re: Need information about CCFL's

So,I swapped the bulbs around and the no light followed the two bad bulbs. I emailed ccflwarehouse and they said their bulbs are compatible.

[johnboy1313]

Re: Need information about CCFL's



Got it done. Thank you Craigslist.

[budm]

Re: Need information about CCFL's

So what did you do that fast?

[johnboy1313]

Re: Need information about CCFL's

I just got two used bulbs from a guy on Craigslist and soldered them in and put it all back together. I posted a pic in the other post about the tv. Are you a moderator here? If not, could you direct me to one? I'd like to add SOLVED to the title of the other thread.

[Jedi]

Re: Need information about CCFL's

I know this is an old thread but I thought maybe I should just piggyback on it instead of starting a new one?

I'm having this same issue with the same model TV. I replaced all the bad CCFL's but now it will come on and light up only on the left side before going back off again a few seconds later. Is this still a bulb issue or could it be the inverter board on the right side?

[tom66]

Re: Need information about CCFL's

Check you seated the connector fully for the right side inverter (slave?)

[mmartell]

Re: Need information about CCFL's

Are you a moderator here? If not, could you direct me to one? I'd like to add SOLVED to the title of the other thread.

Yeah they're not big on that here...

[Jedi]

Re: Need information about CCFL's

Bear with me cause I have little idea what I'm doing. By right side I'm looking at it from the front of the TV. Not sure if that's the slave one or not. Everything seems to be seated firmly. I also swapped out the long board that the bulbs actually plug (just because I had one) and nothing changed. I don't have another inverter board that I am confident is good or I'd try swapping it as well

[tom66]

Re: Need information about CCFL's

Slave will be marked "SLAVE" or "S". Master as "MASTER" or "M".

[Jedi]

Re: Need information about CCFL's

The side that is not working is the Master side. Here is a picture of what it's doing. Again, it only does this for a few seconds and then goes out completely.

[PL519]

Re: Need information about CCFL's

Hi,
interesting to see that all these AUO displays seem to have the same probs. I was working on a philips LC7.5E-LA chassis with same the display some weeks ago. In the same moment the bulbs were ignited i could hear a "pitch" by a little spark inside of the display which caused the whole tv to reset. After opening the display and isolating the area where the sparks occured the bulbs could be ignited. There were 4 bulbs completely dark, found definitely to be defective by exchanging with a good one. 5 bulbs lighted up totally, the rest only lighted up at both ends. The middle section was dark. While tv off i heated up some bulbs with a hair dryer and: these bulbs came up o.k. I´m not sure if that is a sign of aging? BTW, can anyone confirm that this type of bulbs (EEFL´s with no external wiring) can be replaced by CCFL´s. Following this thread johnboy1313 had success with it.
Another interesting fact is that the white reflective foil inside the light box gets partly off the backside of the box producing those dark shadows you can see on the pictures. Same with my philips here. I´m afraid these shadows are clearly visible on screen later. I´m thinking about removing the foil completely and powder coating the complete frame. What are your experiences?
Greetings,
Wolf