Help correcting a Sony CRT TV’s distorted image

[mano1]

Hello all, first time posting here.

I have a flat 24” Sony Trinitron TV which works quite well and has a set of components inputs, which makes it suitable for my needs. I have a scart to component converter box and I’m hooking up old consoles like the Super Famicom, Genesis, PSX, etc, via SCART (CSYNC).

I am getting RGB chips for each console to clean up the image as much as possible, to install at some point in the near future (aka “bypass” etc.)

One thing is that the top edge of the image is slanted, and there’s a horizontal line above it. I haven’t run a grid pattern, but I’m pretty sure there are other things.

The image in general looks good to me, but I noticed that blue text on the interstitial screens of Street Fighter II on Super Famicom to the right by a few pixels. Although I haven’t compared different consoles to see if I could see the same problem, to confirm that it is the TV and not the Super Famicom itself (no RGB bypass installed yet)

I’m planning to discharge it, follow safety procedures, and replace capacitors, etc Whatever takes to fix the image issues.

I have a replacement TV remote for it coming in the mail, which I think will give me more controls, possibly even getting into some service mode I’ve heard about, but I’m not 100% sure this TV has one of these.

I would love to get expert advice on what I should try. I truly appreciate everyone’s help. It would be nice to use this TV before I go hunt down another one. In fact, I got this one for a few dollars at a local thrift store, which is pretty cool.

Model: Sony KV-24FV300

I posted a phone picture, but I plan to set up a DSLR with correct exposure to better capture the geometry issues.

Note: I do not have Judy knowledge in electronics. I’m comfortable with soldering, but my experience has mainly been with making (a ton of) audio cables, audio patch bays, and some kit assembly (think Adafruit, Arduino etc). I have never done any work on a TV


PS: my TV’s specs are below

* Brand/Model: Sony KV-24FV300.
* Series: WEGA.
* Viewable Size: 24 inches.
* Tube: FD Trinitron (A60LPN70X).
* Mask: Aperture Grille.
* Aspect Ratio: 4:3.
* Native Resolutions: 240p, 480i.
* Format: NTSC.
* Horizontal Scan Range: 15 kHz.
* Input Signals: Composite (2 total: 1 front, 1 rear), S-Video (1 rear), Component YPbPr (1 rear), and RF (1 rear).
* Audio: 10 watts x 2, featuring SRS WOW audio processing.
* Chassis: BA-6.
* Weight: 81 lbs (36.7 kg).
* Dimensions: 27" W x 20-3/8" H x 19-3/4" D.
* Launched: 2002.
* Country of Manufacture: Mexico.

[mano1]

Update: link to a quick phone photo. I plan to set a DSLR up with proper exposure settings etc to best document the issues

https://drive.google.com/file/d/1Vmf...w?usp=drivesdk

[old_tv_nut]

Original source is NTSC composite, correct?

I don't see anything wrong with this picture that would be corrected by replacing parts. Some adjustment of the geometry might be possible, but correcting one edge may throw off the others. You need to check it with a regular video source (DVD) that doesn't have black borders and see if there is anything objectionable.

[mano1]

Thanks for the input

Good to know re: not a parts replacement issue

Since I posted, I’ve been saving videos talking about convergence strips and magnets, to correct similar issues. These helped me understand a lot about the subject.

Good idea re: different source. I will try a video source

[mano1]

Original source is NTSC SCART CSYNC -> SCART to Component converter -> TV component input

[old_tv_nut]

Originally Posted by mano1

Original source is NTSC SCART CSYNC -> SCART to Component converter -> TV component input

OK that's what I understood.

[old_tv_nut]

Originally Posted by mano1

Thanks for the input

Good to know re: not a parts replacement issue

Since I posted, I’ve been saving videos talking about convergence strips and magnets, to correct similar issues. These helped me understand a lot about the subject.

Good idea re: different source. I will try a video source

Yeah, if you still have black borders on a regular video source, then there is a problem.

[mano1]

I found out that this specific model has an extensive set of potentiometers (on the tube near the rings) to control convergence and it might be straightforward to achieve what I want without additional strips and magnets. Additionally, the service menu provides width and height and other adjustment. I’ve received a replacement remote to get to that mode. Stay tuned

[Username1]

.

Good Morning: Your tv has symptoms of a Keystone effect, where the picture is
a Inconsistent width from top to bottom. May also be called Trapezoid.

Might even be a Pincushion Setting that needs Adjustment.

This is not a Convergence Problem, do not mess with that you will never get
it back to perfect if you do.

From G -

Because the Sony KV-24FV300 is a cathode-ray tube (CRT) analog television rather
than a digital projector, trapezoidal or alignment errors are corrected via hardware
geometry controls or physical components:


Service Menu Tweaks: You can access the hidden service menu by turning the TV off,
then pressing Display (or Channel Info), 5, Volume Up, and Power On on your original
Sony remote. Look for parameters like rotation (TROT) or horizontal/vertical sizing
options to straighten minor picture slants. Always write down default numbers before
changing anything.

Physical Deflection Yoke Alignment: If the image is severely tilted or angled in a way
the service menu cannot fix, the physical deflection yoke on the neck of the CRT tube
inside the chassis may have shifted or become crooked. Adjusting this requires
opening the back casing of the television and carefully loosening the yoke clamp.



Use this link to get info on your tv, including a service manual where you
can see how to access the secret Service Menu to make adjustments
to the screen Geometry Setup.

https://crtdatabase.com/crts/sony/sony-kv-24fv300


To Me it looks like this can be corrected from the Geometry Settings
in the Service Menu. Try this area first, Looks like Items 7 - 13,
These are the ones to look at first. REMEMBER to write
down the original settings before you change any of
them so you can set it back if that is not the one....
Pg. 18 of the service manual. Under Circuit
Adjustments Section 4.

Also Pg. 27 shows the Geometry Items, What they are called,
and the parts of the screen they will effect.

Good Luck, don't mess with convergence, you will never get it
better than it is now on a set like that. And It does look
perfect as is.....

end transmission........


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