Hissing CCFL Help

[Nama]

Sounds like a slight short in one of the CCFL's.
This monitor has the 2 seconds to black issue.
But if i unplug one set of CCFL's it does not hiss.

What is my next step.

Thanks, Jacob

[Wizard]

Re: Hissing CCFL Help

HV leak in CCFL. Time to trash or try to carefully replace CCFL in the LCD, but you need same length from junk LCD panel.

Cheers, Wizard

[EGuevarae]

Re: Hissing CCFL Help

HV leak in CCFL. Time to trash or try to carefully replace CCFL in the LCD, but you need same length from junk LCD panel.

Cheers, Wizard

I agree with Wizard. The HV is arcing/leaking, and the hiss you hear is from the HV arcing to the metal rail that protect and deflects light.
Time to get another set of lamps.

[Bobdee]

Re: Hissing CCFL Help

Sounds like a slight short in one of the CCFL's.
This monitor has the 2 seconds to black issue.
But if i unplug one set of CCFL's it does not hiss.

What is my next step.

Thanks, Jacob

If you are Lucky like I have been in past, you may have old smashed LCD panel (or faulty one) that has same Backlight unit
If thats ok then you just swap your LCD panel in place of broken one
bob

[EGuevarae]

Re: Hissing CCFL Help

If you are Lucky like I have been in past, you may have old smashed LCD panel (or faulty one) that has same Backlight unit
If thats ok then you just swap your LCD panel in place of broken one
bob

Exactly. That's why it is advised around here that no unit has to be discarded until it has been stripped down completely

[Nama]

Re: Hissing CCFL Help

I wish I did have an extra.
Its a 21" Acer wide screen.
I will toss it in storage till i figure out a replacement.
Thank you all, Jacob

[EGuevarae]

Re: Hissing CCFL Help

I wish I did have an extra.
Its a 21" Acer wide screen.
I will toss it in storage till i figure out a replacement.
Thank you all, Jacob

Those have two at the the bottom. If just one of the pair has failed, you can (I've done it before) one from a, let's say, 19" inside along with the good original one. As the inverter sees the pair complete, it will not shut down. That in case just one arced (normally just one does. You just have to find out which one). Or you can try to get a similar size unit with a broken screen and swap teh lamps. Same brand would be preferred, as others (like the viewsonic) in that size use 6 CCFLs.

[Bobdee]

Re: Hissing CCFL Help

I wish I did have an extra.
Its a 21" Acer wide screen.
I will toss it in storage till i figure out a replacement.
Thank you all, Jacob

I do recall a member having the same syptoms as you he went into unit and was able to resolder connection to CCFL tube, that fixed the problem.
Dont remember who it was but will do some searching if I find it I will post back (I think it was about 3 Mths or more)
bob

[EGuevarae]

Re: Hissing CCFL Help

I do recall a member having the same syptoms as you he went into unit and was able to resolder connection to CCFL tube, that fixed the problem.
Dont remember who it was but will do some searching if I find it I will post back (I think it was about 3 Mths or more)
bob

Could be done if the cable is lose from the pin, but if it is arcing because the glass broke, hasta la vista, baby....

[Nama]

Re: Hissing CCFL Help

Well that was a learning experience!.
Took apart LCD re soldered CCFL ends. still hissing.
So I got one single 19" CCFL as eguevarae suggested. AND BINGO!
Only problem is I cracked the brittle tape circuit that connects the LCD board to the LCD.
I never would have gotten it back together anyway.
So many layers of film, milar and white paper I knew i was lost.
But still a good learning experience.

I will practice taking apart cracked LCD's and re assembling them for a few weeks.
<bows gracefully for a job half done.

[EGuevarae]

Re: Hissing CCFL Help

Well that was a learning experience!.
Took apart LCD re soldered CCFL ends. still hissing.
So I got one single 19" CCFL as eguevarae suggested. AND BINGO!
Only problem is I cracked the brittle tape circuit that connects the LCD board to the LCD.
I never would have gotten it back together anyway.
So many layers of film, milar and white paper I knew i was lost.
But still a good learning experience.

I will practice taking apart cracked LCD's and re assembling them for a few weeks.
<bows gracefully for a job half done.

It is tricky, but with practice it can be done. And don't worry : the first time I did it I broke a beautifully working Polaroid 15" widescreen LCD that in the end worked OK with the recently replaced lamp (just 1 out of the pair was bad) but with a crack on the middle right side . The next I did was flawlessly fixed. That was a 19" wide one, using a 18" LCD's lamp. It is still working as of today.

[Bobdee]

Re: Hissing CCFL Help

Well that was a learning experience!.
Took apart LCD re soldered CCFL ends. still hissing.
So I got one single 19" CCFL as eguevarae suggested. AND BINGO!
Only problem is I cracked the brittle tape circuit that connects the LCD board to the LCD.
I never would have gotten it back together anyway.
So many layers of film, milar and white paper I knew i was lost.
But still a good learning experience.

I will practice taking apart cracked LCD's and re assembling them for a few weeks.
<bows gracefully for a job half done.

I have done a few and lost a few
Its still hit and miss for me
the last one I done was water inside screen, removed that from between defuser sheets and panel etc then went to clean some rust stains off the tape circuits and then splt mine on the bend, they must suffer from heat to be brittle as they were
so some you win and some you loose, hope you have better luck next time
bob