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8753E LCD Display Brightness Question

Question asked by swperk on Apr 22, 2008
Latest reply on May 2, 2008 by swperk

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I just installed my new (to me) 8753E on my bench next to some of my other Agilent instruments with color LCD displays (Infiniium, ESA-E), and noticed that the display on the 8753E, although crisp and quite readable, is noticeably dimmer in intensity as compared to those of the other instruments. I've made sure that all of the intensity settings on the 8753E are at 100%.

Is this considered normal operation for the 8753E? If not, what can be done to address it? Thinking ahead, if it's the backlight that's getting dim, is it a part of the inverter assembly (A27) or the LCD display assembly (A18)?

Thanks,
Stan

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Dr_joel

Apr 23, 2008 9:46 PM

Hi, the 8753E had used some of the first LCD displays used in Agilent. It is likely that the LCD is getting a bit dim, and I would guess it's the flouresent tubes that are the trouble (I've got one with a similar trouble). I thought that the tube was rated at something like 15000 hours, so if it was left on continuously, it could be running out of life. I thought the tube was replaceable, but perhaps not. You can do what I do, and just hook up an external display!

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Adrian Apr 29, 2008 11:12 AM

Hi Stan,

you may look inside the analyzer to see if the backlight is bright white or more orange-ish. The backlight flourescent tubes are located on top and bottom of the LCD display. They are available from various vendors. So, just try a www search. To replace them, carefully remove the display unit and disassemble the strips on top and bottom of the display that contain the tubes. Order new tubes based on the dimensions of the old ones. Keep in mind that they are made of glass, so they are quite fragile.
I've replaced them successfully, just on a different instrument.

Regards,
Adrian

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swperk May 2, 2008 7:34 PM

It's fixed! There is a single CCFL on the left side of the LCD display assembly in my 8753E, so I ordered a replacement 2.2mm x 140mm CCFL tube from Emerging Lighting Technologies (www.ccfldirect.com). I also ordered a 6-inch length of silvered mylar tape (used around the CCFL as a reflector) because the tape in my old backlight assembly was discolored from age. It's easy to pull the front panel off, and getting to the backlight is not difficult either. Total time, start to finish: about one hour. Total parts cost: less than $20, including shipping. Thanks to all for their advice!

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Dr_joel Apr 23, 2008 9:46 PM
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Hi, the 8753E had used some of the first LCD displays used in Agilent. It is likely that the LCD is getting a bit dim, and I would guess it's the flouresent tubes that are the trouble (I've got one with a similar trouble). I thought that the tube was rated at something like 15000 hours, so if it was left on continuously, it could be running out of life. I thought the tube was replaceable, but perhaps not. You can do what I do, and just hook up an external display!
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Adrian Apr 29, 2008 11:12 AM
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Hi Stan,

you may look inside the analyzer to see if the backlight is bright white or more orange-ish. The backlight flourescent tubes are located on top and bottom of the LCD display. They are available from various vendors. So, just try a www search. To replace them, carefully remove the display unit and disassemble the strips on top and bottom of the display that contain the tubes. Order new tubes based on the dimensions of the old ones. Keep in mind that they are made of glass, so they are quite fragile.
I've replaced them successfully, just on a different instrument.

Regards,
Adrian
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swperk May 2, 2008 7:34 PM
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Correct Answer
It's fixed! There is a single CCFL on the left side of the LCD display assembly in my 8753E, so I ordered a replacement 2.2mm x 140mm CCFL tube from Emerging Lighting Technologies (www.ccfldirect.com). I also ordered a 6-inch length of silvered mylar tape (used around the CCFL as a reflector) because the tape in my old backlight assembly was discolored from age. It's easy to pull the front panel off, and getting to the backlight is not difficult either. Total time, start to finish: about one hour. Total parts cost: less than $20, including shipping. Thanks to all for their advice!
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8753E LCD Display Brightness Question

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