How to suggestions for LCD bulb replacement.

[Welchs101]

Hi, I have an LCD computer monitor. It comes on for about 1sec and then goes off. I determined that one of the six bulbs in the monitor were bad. Now i need to replace the bulb. I have removed the bulb housings and i show one of them in the enclosed pic.

I dont know if this is the right forum but so many on here have been so helpful i thought i would try this problem on here as well.

My questions are as follows:
How to remove bulb from metal case?
How to remove “white” rubber piece at end of each bulb?
General ideas/help on how to remove a single bulb and
replace with a new one.
Good place to order a new bulb?
What to measure to determine replacement bulb?

Thanks.

[freelander]

Re: How to suggestions for LCD bulb replacement.

You can coax the bulb pack out of the metal housing fairly simply. Usually the wires are kind of glued down on the back side, you will be able to slide a knife or some other tool under them to separate them from the metal. You should also find that you can push the smaller return wires that go to the far end of the bulb through the rubber housing to give enough slack that you can now separate the metal casing from the bulb packs held by the rubber pieces at either end.

I don't think many people would suggest replacing a single bulb but who knows. There are sources for bulbs but any that I have found are all very expensive. The best bet in my opinion is to get yourself a spare from another similar sized monitor. Ebay, Craigslist etc can be good sources to get the same monitor but a cracked LCD.

I have a picture of a similar three bulb pack that I took apart because it had a dead bulb. Although a single replacement is possible, it certainly isn't easy and I don't know what others would recommend but I don't think it's a good value fix.

[stj]

Re: How to suggestions for LCD bulb replacement.

the tubes will all age together - so change the lot.
digikey sell's them - atleast they were in the last catalog i had.

[Welchs101]

Re: How to suggestions for LCD bulb replacement.

One more thing i was curious about. When measuring the bulbs to determine replacement ..........where do i measure from? Do you know. I will search online a little more but if you know off the top of your head let me know.

thanks.

[Welchs101]

Re: How to suggestions for LCD bulb replacement.

Freelander,

How did you get the "rubber thing" off the bulbs? I keep thinking i am going to break the bulbs.

[stj]

Re: How to suggestions for LCD bulb replacement.

rubber covering the solder joint is pushed on - if it's stick then they may have added glue.

the tube is measured end-2-end of the glass body in cm.
and the diameter in mm.

[freelander]

Re: How to suggestions for LCD bulb replacement.

Lots of gentle persuasion. The wires and solder joint came in on a right angle in mine so there was a lot of coaxing to work it off. In this case, I tried on the dead bulbs that you saw but I had another CCFL bank with a bad solder joint on one of the bulbs. I used the same procedure, re-soldered the joint and voila...it's still running fine!

[Welchs101]

Re: How to suggestions for LCD bulb replacement.

How did you know you had a "bad" solder joint on the bulb? Perhaps, before taking it ALL apart i should just resolder the joint as well.

[stj]

Re: How to suggestions for LCD bulb replacement.

i'v seen that, but your lucky.
usually when the solder is bad it causes a lot of heat.
the heat cooks the solder so it wont melt.
i usually have to file the damned stuff off to put fresh solder on!

[Welchs101]

Re: How to suggestions for LCD bulb replacement.

So i finally got some time to work on this bulb.

I got the single bulb out with not much effort. Thanks.

But now i have another issue regarding this bulb.

I measured this bulb:
~ 460mm in length
~2.27mm in diameter (as measured with micrometer)

But when i go to digikey i cant find such a bulb. Any suggestions? Am i going to have to buy a bulb that is not the same exact size? THoughts?

[PlainBill]

Re: How to suggestions for LCD bulb replacement.

So i finally got some time to work on this bulb.

I got the single bulb out with not much effort. Thanks.

But now i have another issue regarding this bulb.

I measured this bulb:
~ 460mm in length
~2.27mm in diameter (as measured with micrometer)

But when i go to digikey i cant find such a bulb. Any suggestions? Am i going to have to buy a bulb that is not the same exact size? THoughts?

Digikey is not the only source for CCFLs. Sources can be found using both Google and eBay.

PlainBill

[ecking767]

Re: How to suggestions for LCD bulb replacement.

I measured this bulb:
~ 460mm in length
~2.27mm in diameter (as measured with micrometer)

But when i go to digikey i cant find such a bulb. Any suggestions? Am i going to have to buy a bulb that is not the same exact size? THoughts?

The standard size will be 2.6mm x 460mm. try www.ccfldirect.com. but each lamps will cost about 10.00 each.

What size LCD monitor do you have? 22" widescreen ?

PlainBill is right ebay or google may be a better choice for finding these lamps

[Welchs101]

Re: How to suggestions for LCD bulb replacement.

I checked ebay......no 460-465mm bulbs found. I will check a few other sources.

Since the diameter of mine is 2.27mm ...will a 2.6mm bulb work?

The monitor is an HP F2105....i think its 21".

[PlainBill]

Re: How to suggestions for LCD bulb replacement.

I checked ebay......no 460-465mm bulbs found. I will check a few other sources.

Since the diameter of mine is 2.27mm ...will a 2.6mm bulb work?

The monitor is an HP F2105....i think its 21".

Have you tried ccflsurplus.com? Try contacting them via email, asking for a price for the exact dimensions..

PlainBill

[ecking767]

Re: How to suggestions for LCD bulb replacement.

Since the diameter of mine is 2.27mm ...will a 2.6mm bulb work?

The monitor is an HP F2105....i think its 21".

Its a 21" wide screen.. 2.27 isn't a standard size and all site I have visit don't have that diameter. They do have 2.2mm and 2.4mm but not in the length you need. So .. unless you have an gauge meter I'm sure your lamps are 2.6.mm in diameter.

maybe this website will help
http://www.lcdparts.net/CCFL13D.aspx

[Welchs101]

Re: How to suggestions for LCD bulb replacement.

I remeasured the diameter again and it is indeed 2.4mm. Just wanted to let everyone know.

[Welchs101]

Re: How to suggestions for LCD bulb replacement.

FYI: Decided to go with "ccflwarehouse" they had the cheapest overall price. I am sure this fluctuates between vendors but the guy was really nice on the phone when i talked and they were cheapest by 5 to 6 dollars. So now i will just wait for the part and then put the new one in once it gets here.

[Welchs101]

Re: How to suggestions for LCD bulb replacement.

Part arrived in two days and i put it in. It works!

Turns out there was nothing wrong with the first one. But thats another story all together. Of course i did not figure this out until the new one was already in and i was not about to take it out.

Anyway, thanks for all your help!