HP w2338h Screen Disassembly For CCFL Service

[SoranoGuardias]

I'm new on this forum, so please bear with me.

It took me several weeks to find disassembly instructions for an HP w2338h monitor I was given for repair. It has the all-so-common 2 Seconds to Black plague. Eventually, the guy just decided to buy a new monitor instead of fixing this one, so I have a free, barely functional 23 inch monitor. In addition to the 2-sec issue, a harsh buzz issues from the on-board speakers.

I have read extensive posts on this forum, concerning the 2 sec black issue, and have examined all of my components on the logic and power boards. Everything checks out. I am trying to examine the on-screen electronic components, but I have absolutely no idea how to safely dismantle the screen. It has tabs and clips and just about anything else you can imagine.

Can anyone offer any first or second-hand experience in the disassembly of this and similar monitors?

[Rtech]

Re: HP w2338h Screen Disassembly For CCFL Service

You really need to ascertain if the fault is the Screen/Backlights..The easiest way to do that is to use a test backlight that you know works,and use that to plug in place of the originals 'one by one',and see if you can eliminate the '2 sec to Black'.This way you do not need to take the screen apart,and if you can eliminate the CCFLs as the cause, it will save you a lot of heartache.

[Dgtech]

Re: HP w2338h Screen Disassembly For CCFL Service

There are a lot of causes for the symptoms that you described however one may be a clue to where the problem is. If you heard a buzzing sound, it could possibly be the arching of voltage to a lamp. Usually, you'll smell a strange electrical smell with it.


Here is a step by step guide to troubleshooting this problem:

https://www.badcaps.net/forum/showthread.php?t=10419

[SoranoGuardias]

Re: HP w2338h Screen Disassembly For CCFL Service

Aye. The thing reeks, especially when I plug it up and turn it on.

I have already followed the guide. Everything checks out. I am certain it is the lamps. I need to disassemble the screen so I can access and, if necessary, replace the lamps.

[alexanna]

Re: HP w2338h Screen Disassembly For CCFL Service

Post a good focused picture of the sides, and back of your LCD, I'll try to walk you through it.
Don't get me in trouble use managed attachments

[jetadm123]

Re: HP w2338h Screen Disassembly For CCFL Service

I'm new on this forum, so please bear with me.

I have read extensive posts on this forum, concerning the 2 sec black issue, and have examined all of my components on the logic and power boards. Everything checks out. I am trying to examine the on-screen electronic components, but I have absolutely no idea how to safely dismantle the screen. It has tabs and clips and just about anything else you can imagine.

Can anyone offer any first or second-hand experience in the disassembly of this and similar monitors?

How exactly did you verify the components on your boards are good? You can perform quick checks on the transistors, diodes, etc with your meter. However, you cannot verify a cap is good by just looking at it, if that's what you did.

[SoranoGuardias]

Re: HP w2338h Screen Disassembly For CCFL Service

I ran a visual check and then I metered all of the components on the power board.

BTW. I somehow managed to fully remove the LED display from the backlight board, which is what I originally came here to find out how to do properly, and one side of the board has a yellowish tinge to it, like it has been heated. I guess a burned CCFL?

EDIT: Aye. CCFL. Looks like the monitor may have been hit. White powder from the bottom CCFL lamp has been blown all over the back panel.