TDS 220 Backlight Question

Feb 11, 2008 4 Replies
S

We have a TDS 220, S/N B070664, with a very dim backlight. It seems stable, just very dim. The inverter measures 201VAC w/ the backlight connected, 205V without. Is it safe to assume the tube is bad? Tektronix charges $73.00 for the part now, as they no longer sell only the tube (P/N 119-5585-00), it apparently now comes with the whole plastic assembly (P/N 199-4991-11). Is there anywhere to still buy just the tube? It lists the Mfr p/n for the tube as LM0F2964, MFG is LF2569 (Sharp Corporation). Thanks for all help,



Steve


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R

Just speculating, but it may be that the assembly is an overall upgraded backlight. The TDS220 I have at home still works beautifully but one at (a prior) lab that I used was quite dim from the start.

Rich Webb Norfolk, VA
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J

Probably the tube. There's lots of places that sell CCFL tubes in various sizes and color temperatures, they're cheap. Just look up LCD backlight replacement.

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A

Here's one that keeps quite a range. Might be worth giving them a call to see if they can cross ref your type number

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Arfa

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S

I think you might be right. I bought a new tube from the local shop, just a generic tube of the same dimentions, and it's the same brightness. Looks like it just might be a dim unit.

Thaks for all the replies, Steve

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