PS NTSC/UC SCPH-7501 with better video (Vivid Colors) How to spot one?

I have a rare PS1 SCPH-7501 model that i owned since February 2001 made in August 1998 with the serial number reading U6853474
and RF Shield inside says T-2 with a darker gray. And the plastic mold on bottom says 0-09
and the chips say that it was 9824 (24th week of 1998) and what video chip is used in the SCPH-750x and SCPH-900x. I can see chips reading NEC Japan D481850GF and i can see a OKI Japan M514260C-60J. Now to the main thing. On this machine, When you play a game, After the white Sony logo and goes to the SCEA screen, The logo on the shade of red has a better color with a vivid red color as on other PS1's, i always see pinkish hue of red. Also the AV ports are yellowed. Is there a way to identify a PS1 SCPH-7501 or 9001 with better video by taking it apart and looking at the RF shield if it says T- (any number) on it or the ports are yellowed? Please let me know. Also i have some pictures for comparison between the SCPH-9001 if you want to see it.
Here are the images: https://postimg.org/gallery/hom5hdfo/d07276a0/

Console top:



Bottom (Sorry you can't see it. I have a crappy camera. This is the best i can do):


Serial Number U6853474:


Inside:


Notice the RF Shield saying T-2:



Picture of the PU-22 board:



Menu on the SCPH-7501 (with better image shown here):


Picture of a SCPH-9001 menu (with normal image that does not have better colors)
Font Smoothing on the SCPH-7501 with better image:


Font Smoothing on the SCPH-9001 with normal/bad image:


PS Logo colors on the SCPH-7501 with better image:
Pictures of the SCPH-9001 with bad/normal image with a pinkish red on the PS logo:

 

Snip

 

Sorry my camera doesn't have a feature where i can tweak my exposure settings. Since i'm new here and like more friends, What do you mean you don't see any differences in my photos?
I swear, I have an SCPH-7501 shown here in the photos and SCPH-9001 that don't have the same image quality and the 7501 displays a vivid red while the 9001 and every other PS1 displays a hue of pink of the red logo.

 

Most of the PlayStation video hardware is digital, and hence is unlikely to show any significant variation between units. Electrically, the PU-22 and PU-23 are almost identical - the only real difference is the the removal of the parallel port and the components associated with it, none of which are involved in video generation.

On the PU-20 and onwards, the video DAC and the color encoder are integrated into the same chip, and that's really about the only thing that could affect the video output. The only other analog parts involved in the video are the color subcarrier reference, which comes from the same clock synth that runs everything else.



At different times, Sony used two different chips for the video DAC - one was a Rohm part and the other was a Sony made component. Personally, I could never notice any difference between them, but it might be worth checking.

 

I recently found one PU-22 with a Sony encoder. Didn't notice any difference either.

 

Are you kidding? LOOOOL

 

Where do i find the Clock Synthesizer and Video Encoder chips on the PU-22 board? Can you post a picture?
What does a Clock Synthesizer do?

 

I haven't got a PU-22 with the screening removed handy, but those parts are to the left of the GPU on that board. The reference designations are the same - IC502 for the video DAC/Encoder and IC204/X201 for the clock synthesizer.

The clock synthesizer does pretty much what the name implies - it has a single crystal and generates multiple clock frequencies from in. In the case of an NTSC PlayStation, the frequencies are as follows (PAL machines are different).

Main crystal: 14.3182MHz
Color reference: 3.5795MHz
GPU Clock: 53.693MHz
CPU Clock: 67.7376MHz

You might notice that the selected crystal frequency is 4 times the color reference signal frequency - this is intentional. It's done that way so the color reference can be generated by simply dividing down the crystal by 4 - using a direct divider like that gives you a signal with lower phase noise than you would get if you generated it using a PLL like the GPU and CPU clocks.

Also note that the quality of the color reference clock only matters if you are using either composite or Y/C (S-Video) modes - if you use an RGB connection, the whole encoder section is effectively bypassed and the display just runs off a buffered version of the video DAC outputs.

 

I use a Compostie video connection with a Durabrand 13 Inch Color CRT TV Television Model DU1301 and when i use the SCPH-7501, I get a vivid red on the SCEA screen and on my SCPH-9001 and SCPH-101 (Slim PSone), I get a pinkish hue of red on the PS logo on the SCEA screen. I checked the video chip on my SCPH-7501 and it was 783-41 RVR832 and my Clock synthesizer on my SCPH-7501 shown here is a CY2081 SL-500 8319341 and i checked my SCPH-9001 and the video chip (IC502) is a Sony A2106R 937 BJ9V and it's clock synthesizer is a 14.318 kds 932 Indonesia. So, Do the 783-41 RVR832 video encoders and the T- with a number (My SCPH-7501 is T-2) are the encoders that have better video with vivid colors? Because my 9001 is Sony A2106R 937 BJ9V (the one with pinkish red on the logo on SCEA). Is it true? Because i just checked the video encoders and clock synthesizers on my 7501 and 9001.

 

I use a Compostie video connection with a Durabrand 13 Inch Color CRT TV Television Model DU1301 and when i use the SCPH-7501, I get a vivid red on the SCEA screen and on my SCPH-9001 and SCPH-101 (Slim PSone), I get a pinkish hue of red on the PS logo on the SCEA screen. I checked the video chip on my SCPH-7501 and it was 783-41 RVR832 and my Clock synthesizer on my SCPH-7501 shown here is a CY2081 SL-500 8319341 and i checked my SCPH-9001 and the video chip (IC502) is a Sony A2106R 937 BJ9V and it's clock synthesizer is a 14.318 kds 932 Indonesia. So, Do the 783-41 RVR832 video encoders and the T- with a number (My SCPH-7501 is T-2) are the encoders that have better video with vivid colors? Because my 9001 is Sony A2106R 937 BJ9V (the one with pinkish red on the logo on SCEA). Is it true? Because i just checked the video encoders and clock synthesizers on my 7501 and 9001.

 

Oh, And what console do you prefer since i love the 7501. 7501 or 9001.
And oh because i want a chance to find another SCPH-7501 or 9001 with this better image shown here that displays a vivid red.

 

Oh, And what console do you prefer since i love the 7501. 7501 or 9001.
And oh because i want a chance to find another SCPH-7501 or 9001 with this better image shown here that displays a vivid red.

 

you're using composite and wondering how to get better quality by choosing a different model? invest in s-video at least if you're in the us, or rgb -> component it that's a possibility.

 

^ What he said. As long as you're willingly using composite cables you only have yourself to blame for bad image quality, not the encoder.

In b4 "but the RF modulator I'm using only has composite input!"

 

I'd like to remind you guys that the PSX uses dithering heavily. The effect only works with composite video and on a classic CRT TV.
So that's one good reason to use a composite cable. It also validates looking for a good composite encoding.
In my experience, the models 700x and up do a nice job.

 

You may have a point there. But: You can make out some of that dithering even with a composite cable. If your goal was seeing as little of it as possible, shouldn't you be looking for a worse encoder?
Imho, overall going RGB is still worth it even if e.g. Silent Hill loses a bit. (Not that I have much of a choice, me being in PAL land and wanting to play NTSC titles, it's either RGB, or monochrome.)

 

It depends on the console and the encoding mode (PAL60 vs real NTSC). If the encoding and mode are *just right*, the effect works.
I'm using a Sony 100Hz CRT TV from the mid 90s and works with real NTSC on CXA1645 consoles and PAL60 on many of the later consoles, but *not* the cost reduced PSOne's. On those consoles, I get color dot crawl and it's just ugly.
It will also totally fail on any upscaling device, such as modern flat TV.

 

Is Rohm or Sony a good encoder? My 7501 has a Rohm encoder and i use a 13 inch Durabrand TV for the color test.

 

Is Rohm or Sony a good encoder? My 7501 has a Rohm encoder and i use a 13 inch Durabrand TV for the color test.