Electronics > Repair

GW Instek MSO-2204EA Backlight Bleed - Solution request.

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rfdes:

I own an  MSO-2204EA  oscilloscope that wasn't used for about 6 months.  Upon powering it up, it was immediately noticed that there is significant 'backlight bleed' on the right side of the screen.  Not knowing how the screen is constructed and fastened to the front panel, it appears something has warped or some adhesive bond has failed.  The question is whether anyone else has seen this issue with their scope.   If so, is there any advice in regards to gaining access to the screen and repairing this issue? 

Thanks - Jim

BlownUpCapacitor:
If you could provide a photo, it would be easier for us to see the issue.

My first thought was maybe the LCD is loose?

rfdes:
Here is a photo showing the bleed on the right side of the screen.  There is no bleed on the left side of screen.
Any advice is appreciated.
Thanks.

BlownUpCapacitor:
To me it vaguely resembles something peeling off of the display; Is it the polarizer? If is it, you can use some tape to hold it down, or potentially use some glue, though glue may be more tricky and may or may not alter the light from the LCD.

rfdes:
You may be right.  I was hoping someone has been inside the scope showing how it is assembled.  I guess the only way to know is to tear into and hope that I don't do any damage.  I'll try to document my adventure and post my results.
Thanks

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