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| November 14, 2012, 2:44 pm |
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| Author |
"Magenta Ring" mentioned in KV-27FS100 service manual |
BillBryant
Rank: Sony Buff
Joined: Nov 28, 2002
Posts: 19
From: South Dakota
 |  Posted: 2003-01-19 19:48
The "Magenta Ring" problem so many of us are troubled by is mentioned in the KV-27FS100 service manual.
On page 15, under the section "2-3. FOCUS" it reads, "Receive an entire white signal. Make sure Magenta Ring is at an acceptable level."
Well, there you go. SONY knows it's there, and even mentions it in the service manual. Notice it doesn't say, "Adjust focus until Magenta Ring is gone," but make sure it's at an "acceptable" level. Youch!
Directly under these instructions is a picture of part of the TV's guts with a knob marked focus. Perhaps the idea is to turn this knob until the magenta ring is gone. The more I read the entire section the more I get the idea is that you're supposed to focus the set as best you can while compromising between fucus resolution and magenta ring level. I feel like opening my set and finding out.
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BillBryant
Rank: Sony Buff
Joined: Nov 28, 2002
Posts: 19
From: South Dakota
| Posted: 2003-01-20 00:23
Well, I did it. I took the back off and messed with the focus control. BTW don't try this yourself unless you understand that very high, potentially lethal voltages are exposed when you do this. BE VERY VERY CAREFUL!!
So here's what I found out. Going back and forth between a 100% white screen and a resolution test screen, I discovered that there is an extremely critical spot on the knob where resolution stays high and the magenta ring or halo is minimized. Stray from this spot even a couple of degrees and you get either too much pink halo or noticable out of focus resolution.
Try this at your own risk, or get a techie to come do it for you. Do be aware, however, that you will probably have to accept something of a compromise between ultimate resolution and at least a bit of the pink halo.
I ended up with the control about eight degrees to the left of where it came from the factory, but I imagine everybody's set will be different.
Also, I suppose you can make this service adjustment without test patterns, perhaps using certain free-framed DVD stills, but I wouldn't want to. Using something like AVIA makes it much easier.
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quadraphonic
Rank: Sony Buff
Joined: Jan 05, 2003
Posts: 11
From:
 | Posted: 2003-01-20 20:29
Congrats Bill..
I'm sure you breathed a sigh of relief once you had your hands OUT of the innards of your set.
On a side note, I sent you an e-mail a few days back regarding the KV27-FS100 and your personal set-up. Did you receive it? It would have come from the following e-mail:
Talk to you later,
Will
-----------------
quad
[ This message was edited by: quadraphonic on 2010-12-14 23:32 ]
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fhn
Rank: Sony Aficionado
Joined: Jan 16, 2003
Posts: 106
From:
 | Posted: 2003-01-21 17:59
I just picked-up the FS100. I don't see the "pink" halo in a white background. However, the bottom right of the screen is bowed downward by about 0.25" and vertical lines are not straight. The color decoder is good, but not exceptional. White appears a little blue, even in warm/movie mode. Dark-black also looks a little grey (brightness @ 27). You definitely have to disable the factory "red" enhancement setting.
The cable TV tuner is very good. You don't have to wait all day to advance to the next channel. VERY NICE feature! The remote control sends out a very powerful IR signal, so there's no need to aim it at the TV if you're within a 10 foot range.
The TV has a separate power supply board located on the right side of the TV. Some high failure devices are located on this board to facilitate repair. I expect to see some cold solder joints by the look of my PCBs. Cheap Mexican quality control.
The best features of this Sony remain the Picture tube and the ability to refocus the scan of the CRT to handle 16:9 output from a DVD. My experiences tell me that "durability" will be an issue with this set. Sony's sacrificing quality for quantity. I personally would pay $700 for a well-built 27 incher.
Finally, the volume control lacks resolution at the low end range. +2 is too soft and +3 is too loud at night. I would prefer to have two separate buttons to scan my pre-programmed favorite channels.
I can live with a good color decoder if I could fix the geometry problem. For those who are concerned about the dark current draw, this Sony will use 2.5 watts in the "OFF" state. Anything below 3 watts earns an Energy Star rating. Some Toshs and Panas can draw as little as 1.2 watts.
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Malikeye
Rank: Sony Enthusiant
Joined: Jul 19, 2002
Posts: 25
From: Toronto, Canada
| Posted: 2003-01-26 12:29
Bill did you notice any faint vertical lines on both sides of the screen as well. I didn't notice them until I watched a white picture like a hockey game, and there they were.
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RMS
Rank: Sony Buff
Joined: Jan 30, 2003
Posts: 18
From: Ann Arbor
| Posted: 2003-01-30 15:47
This is the "pink bars" or "magenta ring" problem discussed above. It is most evident when watching programs with white backgrounds, like a hockey game.
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fhn
Rank: Sony Aficionado
Joined: Jan 16, 2003
Posts: 106
From:
| Posted: 2003-01-31 13:43
Additionally, if you put the TV in composite/component video, you will see about three vertical shadow bands (approximately 2" wide) on the picture tube. It's best to view this effect in a dark room with the source broadcasting a black background.
I also noticed all video backgrounds to be dark grey or red, when there's no video input signal. Very frustrating because this TV is capable of displaying a very high resolution picture. These video artifacts are probably the result of the low entry price.
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RMS
Rank: Sony Buff
Joined: Jan 30, 2003
Posts: 18
From: Ann Arbor
| Posted: 2003-02-01 08:19
For what it's worth, I went back to Best Buy to look at other WEGA models and I was able to see the pink bars on white backgrounds on the 32" wegas as well.
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