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 Post subject: [CLD-1950] Picture problems
PostPosted: 06 Jul 2022, 16:43 
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I am trying to tune up the cld-1950 player. When movies are played, the picture is very foggy and not clear.

I've moved the tilt offset, fcus gain, track gain and RF level potentiometers back and forth. Some improvement is appreciated, but without solving the problem. Should I move the rest of the potentiometers?

I would like to know if it could be a problem with the laser lens. By the way, is it possible to remove the white plastic cover that covers the lens for better cleaning? I have cleaned the lens with a cotton swab and isopropyl alcohol.

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https://youtube.com/shorts/J_pCONsayj8?feature=share
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 Post subject: Re: [CLD-1950] Picture problems
PostPosted: 06 Jul 2022, 17:08 
Jedi Knight
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It’s probably not the laser. It’s almost never the laser.

I wouldn’t move a single potentiometer without service information, tools, and a test disc.

LD is 45 year old analog SD video and that isn’t a particularly high end deck to begin with. First and foremost: do you have enough experience with LD to know what kind of quality to expect? Are you trying to do the impossible?

EDIT: I watched the video, definitely a legit issue. Top Gun looks a little rotty. Noise everywhere. How many other discs do you have?
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All about LD care, inner sleeves, shrink wrap, etc.

https://youtu.be/b3O-vHpHRpM
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 Post subject: Re: [CLD-1950] Picture problems
PostPosted: 06 Jul 2022, 17:43 
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I don't have proper tools or a test disc. I have marked the place where the potentiometers were located before moving them.

All NTSC and PAL movies I've tried look similar. I have an extensive collection of titles and they look great on other players. It's not a disk rot problem.
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 Post subject: Re: [CLD-1950] Picture problems
PostPosted: 06 Jul 2022, 18:06 
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I think the problem might be more in the processing stage as the picture (as well as sound from what little I can hear) are both terrible. There is probably nothing wrong with the laser pick-up or it’s adjustments.

I would look for dried capacitors first in the power supply stage.
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 Post subject: Re: [CLD-1950] Picture problems
PostPosted: 06 Jul 2022, 18:16 
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Sorry for the video quality. The sound is perfect when movies are played. Also the sound is good when playing music CDs
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 Post subject: Re: [CLD-1950] Picture problems
PostPosted: 06 Jul 2022, 18:40 
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In that case, I would look at the video processing stage. Also could be simply bad capacitors causing all these issues.
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 Post subject: Re: [CLD-1950] Picture problems
PostPosted: 07 Jul 2022, 01:57 
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Don't mess with the lens.

Does CD audio have any distortion in the first or last track?

With no oscilloscope, an easy check is applying extremely small amount of pressure upwards or downwards (causing the large entire base to slightly tilt) on the silver rail the carriage rides along while a LD is playing and see if the video clears up. This can be risky so proceed with extreme caution if you decide to do so. Not sure if it is easily reachable. Maybe so with a 20cm disc.
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 Post subject: Re: [CLD-1950] Picture problems
PostPosted: 07 Jul 2022, 10:07 
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Playback of music CDs is generally good.

In some cases, I have detected problems with a track and it may coincide more or less with the beginning or end of the discs. Manipulating the TRKG GAIN it seems that those jumps improve or disappear.

Complex access to the car while it works. What does that prove?

Replacing capacitors I see it as a titanic task
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 Post subject: Re: [CLD-1950] Picture problems
PostPosted: 07 Jul 2022, 14:30 
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abasira wrote:
Complex access to the car while it works. What does that prove?

Don't bother with it. It is easier on Both Side Play models. It can prove if electrical or mechanical issue.

Does the video look better at start of disc or end of disc or do they look the same?
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 Post subject: Re: [CLD-1950] Picture problems
PostPosted: 07 Jul 2022, 16:05 
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In general, the image always looks more or less the same. In some cases I find it worse at first.

Has anyone replaced the capacitors on the board have a list of the ones needed? Will it have something to do with it?
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 Post subject: Re: [CLD-1950] Picture problems
PostPosted: 08 Jul 2022, 03:40 
Jedi Master
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Wonder if this is just dirty contacts on the RCA cables??????
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 Post subject: Re: [CLD-1950] Picture problems
PostPosted: 08 Jul 2022, 07:06 
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I have cleaned the video and audio outputs. I have tried all 3 possible video connections and I have also tried different cables. The result is similar.

I have had no audio problems on the last few music cds tested.

I'm beginning to wonder if the image problems are caused by some bad capacitor located in the power supply.

I would like to change the capacitors in the power supply. Does anyone know what they are?
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 Post subject: Re: [CLD-1950] Picture problems
PostPosted: 08 Jul 2022, 21:09 
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abasira wrote:

I would like to change the capacitors in the power supply. Does anyone know what they are?


You just have to look @ each capacitor you plan to replace and see what voltage (v) and microfarad (uf) rating are printed on them. Hopefully one or more of these caps in the power supply is causing the issue but there is no guarantee it is the culprit. Still, if I was doing this repair and had no real clue on where to start, the power supply is a good first step.
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 Post subject: Re: [CLD-1950] Picture problems
PostPosted: 09 Jul 2022, 01:11 
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If a cap is bad, it would likely be in the video section.

Can you check if this gear is missing any teeth:
Attachment:
Y_Gear.jpg
Y_Gear.jpg [ 14.19 KiB | Viewed 1725 times ]
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 Post subject: Re: [CLD-1950] Picture problems
PostPosted: 12 Jul 2022, 14:02 
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The gear is perfect.

The only alternative I can think of is to check the power supply capacitors and check the imaging boards. (VDTB-Assy, PALB-Assy, YCNR-Assy. Service Manual page 1-13 and 1-14).

Hints and tips welcome
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 Post subject: Re: [CLD-1950] Picture problems
PostPosted: 13 Jul 2022, 23:06 
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I'm still thinking something mechanical. Have you replaced the belt?
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 Post subject: Re: [CLD-1950] Picture problems
PostPosted: 13 Jul 2022, 23:15 
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I have changed both belts. I have also cleaned the gears where the belts go.

If it's something mechanical, I don't know what it could be.
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