PU-18 [5502] PS1 boot issue

Discussion in 'Modding and Hacking - Consoles and Electronics' started by hoppy, Feb 28, 2018.

  1. hoppy

    hoppy Member

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    mm3 pic I used the 12c508a, but after several disk recognition failures, I entered the ps1 logo and then the DISC spin slows down and the game fails to boot. When I operated the lens on another device, its condition was good. What chips are on the right side of the motherboard? I want to know if this will interfere with chip operation. I disconnected it, but the screen is black and white.
    [Why is the 5502 ps1 PCB part with Chinese? I think this is really bad.]

    [​IMG]





    [​IMG]


    This is old crew before MM3 installation.
     
    Last edited: Feb 28, 2018
  2. Dr.Funk

    Dr.Funk Lost Media Enthusiast

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  3. hoppy

    hoppy Member

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    [​IMG]

    This is an unknown oscillator. If remove this, the default PAL output will be black and white. I have a pal output tv, [BIOS displays SCEE.]
     
    Last edited: Feb 28, 2018
  4. sp193

    sp193 Site Soldier

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    I guess it is to change the video signal carrier. So that NTSC would be proper NTSC.
    When you have NTSC output by a retail PAL set, that NTSC is not exactly proper because the PAL set has a different oscillator.

    What do you mean?

    Does your TV support both PAL and NTSC?
     
  5. hoppy

    hoppy Member

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    I do not trust the quality of the console manufactured in China. Regrettably, my 5502 ps1 I have seems to be assembled in China.
    My broadcast-only monitor [CRT] supports both 50 / 60hz. [Translator English Please understand.]
     
  6. Dr.Funk

    Dr.Funk Lost Media Enthusiast

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    Dude everything is made in china. The ps1 systems where pretty sturdy regardless of where they where made.
     
  7. TriMesh

    TriMesh Site Supporter 2013-2017

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    What are you trying to do?

    With that oscillator installed the video output has a 3.579MHz (NTSC compatible) color sub-carrier in both 50Hz and 60Hz modes. Depending on your TV, this may or may not display correctly.

    If you remove the oscillator, then you will also need to repair the traces that have been cut to the left of the CXA1645 video encoder - after this, the console will generate a standard PAL signal in 50Hz mode, but a non-standard output in NTSC mode.

    Finally, even if your console is made in China I wouldn't worry about it - the CMs that Sony were using were good quality and there is no noticeable quality difference between the ones that were assembled in Japan and elsewhere.
     
  8. hoppy

    hoppy Member

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    Thank you for the reply. I've been doing lazy laser analysis. It still stays on the PS1 logo, so the game screen does not appear, and the CDROM is only slowly turned. I am living in a 220v 60hz country. Is it because of this?
     
  9. TriMesh

    TriMesh Site Supporter 2013-2017

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    220V 60Hz is an unusual combination - the only place I'm aware of that uses it is Korea - but it shouldn't cause any problems.

    If you can get to the black boot screen, then it means things are basically working - the console is recognizing the disc, reading the TOC and successfully reading the first sectors (the logo is stored there) - if it's failing to get any further then it's probably being caused by a poor signal from the CD drive.

    Unfortunately, there are a lot of possible causes for this - looking at your photos, one thing I can suggest is that you should use shorter wires and avoid routing them over the sensitive parts of the circuit - if the pickup is a little weak anyway then the added noise can be the difference between it working or not.

    The CD pickup has some very low-level signals and they are easy to interfere with - try to avoid the wires crossing the board in the area I have marked in red on this photo (OK, this is a top view and the chip is on the bottom, but you get the idea).
    PU18_Top.jpg
     
  10. rama

    rama Gutsy Member

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    Also try replacing C705 in the last picture. It is a 0.47uF electrolytic capacitor that's used in a filter.
    I sometimes have this go bad and it causes all the problems you'd get from a bad laser / drive.
     
  11. hoppy

    hoppy Member

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    Thanks for your advices. Modchip wire alignment and, although the c705 was replaced, it was not fixed.

    [​IMG]


    replacing parts, ntsc-j 5500 PS1 picture.


    [​IMG]


    5502 PCB Unknown Sticker Label ...


    [​IMG]


    SCPH-5500 Normal boot





    Problem with 5502 PS1





    ※ Details: When the console warms up, the PS1 logo appears.
    However, after the PS1 logo, you can never enter the game.
    I want to fix it because it is a PAL PS1 with Parallel port which is hard to find in Korea. :(
     
  12. TriMesh

    TriMesh Site Supporter 2013-2017

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    OK, the first obvious thing is swapping the power supply and optical pickup between the SCPH-5500 and the SCPH-5502 and seeing if you have any different behavior. if not, then it's pretty clear the SCPH-5502 mainboard is the problem area.

    All the sticker says is "void if damaged" and "date" - my guess is that it's some sort of warranty label.
     
  13. rama

    rama Gutsy Member

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    Yep, the problem is most likely the mainboard.
    The 5502 does detect the disc and manages to read a little, but not well enough to read the PSX logo stuff.

    You already replaced C705 so at this point, if swapping the power supply and/or drive don't help, then it's going to be hard to diagnose further.
    An oscilloscope would help verifying the laser RF signal and 3.3V + 7.5V supply.
     
  14. hoppy

    hoppy Member

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    problem still remains. Thank you for your answers. I will sell it off as a part. But can I give you another question? Of the fat PAL ps1 models, 9002 and below were all confirmed with 50hz single hertz support. In Korea, electric hz is 60, so if you extract the power board of NTSC console and transplant it, is it completed in 60hz? If it is not, I want to know if it is a combination of power board 60hz + main board 50hz exclusive parts?
     
    Last edited: Mar 1, 2018
  15. TriMesh

    TriMesh Site Supporter 2013-2017

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    If you are asking if you can run a 50Hz rated SCPH-xxx2 power board from a 60Hz supply then yes. This is also true the other way around -- a 60Hz SCPH-xxx1 board will run from 50Hz power.

    There is also no problem with swapping the supplies between units - Sony ever did it themselves, since the original SCPH-5003 "Asia" Playstation was just a Japanese main board with a 220V PAL PSU.

    The only thing is that the early units (SCPH-1000, SCPH-3000, SCPH-3500, SCPH-500x, SCPH-1001, SCPH-1002) had a different internal power connector than the newer ones, so you can't directly swap them.
     
  16. bart_simpson

    bart_simpson Dauntless Member

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    Could be bad mod chip cause this aswell I I had someone sent me a console with a pre programed chip and then I had to program my own blank pic112c508a and then worked
     
  17. hoppy

    hoppy Member

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    I do not currently have a genuine PAL game disc. The only way to verify this is to reinstall old crew MODchip. I can not remember the wiring diagram of this. Can anyone help with this? [Anyway, I have to remove mm3 and reinstall the old one before selling the console.]
     
    Last edited: Mar 1, 2018
  18. MackLast

    MackLast Member

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    All Playstation 1 consoles were mainly manufactured in Japan. I have never heard of ps1 scph-550x series made in China before.
     
  19. rama

    rama Gutsy Member

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    Whatever the problem was, the PSX accepted that disk in the video. When it spins up to 2x mode, the license wobble was accepted.
    (Either by modchip action, or by valid disk for the Mechacon region)
     
  20. TriMesh

    TriMesh Site Supporter 2013-2017

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    I wonder if there is another trace cut on the board? Looking at that PIC, if it is running the Old Crow code then the gate wire wasn't connected, just data.

    The pins are:

    4 - MCLR/ - connect to IC304 pin 13 (reset signal)
    5 - VSS - same as MM3 pin 8
    7 - DATA - same as MM3 pin 6
    8 - GATE - same as MM3 pin 5
    14 - VDD - same as MM3 pin 1
    16 - CLKIN connect to IC304 pin 14 (4.2336MHz clock)

    I've seen Japan (mostly), Mexico (SCPH-xxx1 only) and a small number of "Assembled in the USA from foreign components" consoles. I've been told there are "Made in China" SCPH-9002s, but I'v never seen one. The Chinese production only seems to have started up in volume during the PSone period and especially with the machines using the PM41(2) board.
     
    Last edited: Mar 3, 2018
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