Samsung TXN2668WHF - AVS Forum
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post #1 of 11 Old 12-18-2011, 01:20 AM - Thread Starter
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Okay, I just picked this one up earlier today very cheap. It is a rather standard Samsung CRT, 480i, 480p and 1080i only, no DVI. I've googled, poked around several places, and searched this forum but can find no indication of a service manual available anywhere. Although I did find a user manual. Which is very strange, the cover of the user manual displays something like a dozen different CRT TV model numbers and this one is just one of many. It lays out several non-specific features for all of these TVs and names a few when there is a specific feature to talk about, but there is nowhere but that cover which ever mentions the model number TXN2668WHF.

Does anyone have a service manual for this model? Or know how to enter the service menu?
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post #2 of 11 Old 12-19-2011, 05:19 AM
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I've had a TXN3071WH and a TXP3071W, the latter with manual and yes, there are many model numbers listed on that manual.

Do any of them come close?

Don't know how fast you type, but any chance of listing them all?

I am pretty sure the W suffix stands for wide screen (probably 16:9). I don't know what the H and F suffixes stand for.

Regards,
Tom

PS. Check out the dot pitch of the screen. My TXN had incredibly small triangular dot pitch - like a computer monitor - while my TXP has a terrible coarse Trinitron pattern fit only for a SD set. If you have the super fine dot pitch, you may want to be very careful if you upgrade to another CRT which could easily be much worse. ...like the TXP (!)
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post #3 of 11 Old 12-19-2011, 09:57 AM - Thread Starter
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I downloaded the manual here.

The cover of this manual states:
  • TXN2771HF/TXN3071WHF
  • TXN3271HF/TXN2798HF
  • TXN3098WHF/TXN3298HF
  • TXN2775HF/TXN3075WHF
  • TXN3275HF/TXN2670WHF
  • TXN2745FP/TXN3245FP
  • TXN3234HF/TXN2668WHF

It's a pretty simple manual for one that covers this many models, but I would really like to locate a service manual for this CRT.
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post #4 of 11 Old 12-19-2011, 12:21 PM
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Hey, your model is the last one in the list. Its the right manual.
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post #5 of 11 Old 12-19-2011, 03:03 PM - Thread Starter
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I know that it is the right user manual, but it is not the service manual. The service manual will have additional instructions on settings, how to open the tube and take apart every component, it will have chip numbers for things on the motherboard, capacitor values, resistors, etc. etc. IOW if anything at all breaks the service manual is the way to resurrect this tube, not the user manual.
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post #6 of 11 Old 12-24-2011, 11:34 PM - Thread Starter
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Well, I still haven't done much with this one, but this weekend I did get the time to clean the living hell out of it, inside and out and man was it dusty, with cobwebs on the inside to boot.

One thing I can let 6volt know is that this is definitely not anything like a screen with an aperture grille (i.e. Trinitron style), it has easily visible horizontal blanks as is typical of a shadow mask screen. Additionally, powering it on to the solid-green screen that shows when you select a component input without any connection, the width of both the pixels and the gap between them is also noticeably wider at the left and right edges than it is at the centre. This isn't as pronounced as the slimfit screens (either Samsung's, or LG's) but it is still noticeable.

Still would like to find a service manual for this unit.
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post #7 of 11 Old 12-26-2011, 04:42 PM
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Snake,

Is there any chance you could make a rough measurement of the dot pitch in the center of the screen?

I just measured my crappy "Trinitron" TX-P3071W and it is a sad .67mm at the center and about .75mm at the sides.

I had a TX-N3071WH for a few days (I simultaneously stumbled onto a buyer for mine and a seller of the TX-P by accident so I jumped on it) and I thought mine too had a shadow mask with very find pitch.

You measure pitch by distance between any two like pixels, red to red, green to green, blue to blue. Pitch is the width of the narrowest white line that can be made.

Thanks
Tom
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post #8 of 11 Old 12-26-2011, 07:35 PM - Thread Starter
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The only problem is finding a ruler with measurements that fine. Everything I have that I can put my hands on has only cm.
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post #9 of 11 Old 12-26-2011, 08:12 PM
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Snake,

Its way too difficult to measure one pitch directly.

1cm is actually perfect. 1cm = 10mm.

So all you do is count the number of "pitches" that fit in 1 cm.

If you get say 20, then the calculation 10mm / 20 = 0.5mm pitch.

Again, if you have a digital camera, it is so easy because you can simply zoom the image right on the camera so you can count them easily.

Thanks for trying so far!
Tom
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post #10 of 11 Old 12-27-2011, 01:49 PM - Thread Starter
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Wouldn't keeping it to scale become an issue? Regardless, I'll post a screenshot for you later tonight.
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post #11 of 11 Old 12-27-2011, 03:15 PM
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Its a statistical way to measure something too small for direct measurement.

Like the thickness of a sheet of paper if you don't have a micrometer to make the direct measurement.

You get a ream of 500 sheets, measure the thickness, and then divide by 500. For example, 1.5" / 500 = 0.003"

You could not measure .003, but you can measure 1.5
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