GW Instek MSO-2204EA Backlight Bleed - Solution request. - Page 1
Forum section: electronics / repair

author: rfdes
author_rank: Regular Contributor
timestamp: September 17, 2024, 06:35:36 pm
content: 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

author: BlownUpCapacitor
author_rank: Frequent Contributor
timestamp: September 17, 2024, 07:42:05 pm
content: 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?

author: rfdes
author_rank: Regular Contributor
timestamp: September 18, 2024, 05:06:11 pm
content: 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.

author: BlownUpCapacitor
author_rank: Frequent Contributor
timestamp: September 19, 2024, 04:36:54 pm
content: 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.

author: rfdes
author_rank: Regular Contributor
timestamp: September 19, 2024, 05:08:32 pm
content: 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

author: seronday
author_rank: Regular Contributor
timestamp: September 19, 2024, 10:01:28 pm
content: Have a look at this.https://www.eevblog.com/forum/testgear/gw-instek-gds-2000e-teardown-short-review-comparison-with-rigol-ds2000%28a%29/You may be able to find the info that you are after in thereRegards.

author: nctnico
author_rank: Super Contributor
timestamp: September 19, 2024, 10:18:40 pm
content: Is the protective film still on the screen? TFT displays always have a protective film and many manufacturers leave it up to the user to remove it.

author: wraper
author_rank: Unknown
timestamp: September 19, 2024, 10:33:11 pm
content: IMHO either don't bother with it, or order a new display. Should be some off the shelf display that is likely available on aliexpress. If you decide to take the display apart, be ready it may be destroyed in the process. At least ensure that you can buy a replacement before doing anything with it.

author: rfdes
author_rank: Regular Contributor
timestamp: September 19, 2024, 10:46:06 pm
content: Quote from: nctnico on September 19, 2024, 10:18:40 pmI've purchased the scope new about 5 yrs ago and removed the film upon unpacking.Thanks

author: rfdes
author_rank: Regular Contributor
timestamp: September 19, 2024, 10:50:28 pm
content: Quote from: wraper on September 19, 2024, 10:33:11 pmYes, I guess I will simply leave it alone unless it gets so bad as to become unusable. More of a nuisance at the moment. If I ever decide to tear into the unit, I'll document my findings. Take care-Thanks.