Image Map Image Map
Page 1 of 2 12 LastLast
Results 1 to 10 of 14

Thread: Atari 800 xl brown screen

  1. #1

    Default Atari 800 xl brown screen

    Hi guys i wanna wish merry Xmas to all!!
    Im here cause i ve one Atari 800Xl...when i turn on i can see red led light but on Tv
    i see only dark brown screen...I tried with antenna and composite cable but nothing changes...
    Can someone help me to repair please?
    Thanks!
    20191224_130150.jpg

  2. #2
    Join Date
    Jun 2012
    Location
    UK - Worcester
    Posts
    3,543

    Default

    And a Merry Christmas to you too ilpaninaro.

    Is the dark brown screen actually coming from the Atari 800XL or not? What do you get on the screen if you turn off the Atari in this mode?

    The 800 XL has a self test mode (see section 2 of http://classiccomputers.info/down/At...ice_Manual.pdf). Will it even go into self test mode at all?

    Dave

  3. #3

    Default

    Quote Originally Posted by daver2 View Post
    And a Merry Christmas to you too ilpaninaro.

    Is the dark brown screen actually coming from the Atari 800XL or not? What do you get on the screen if you turn off the Atari in this mode?

    The 800 XL has a self test mode (see section 2 of http://classiccomputers.info/down/At...ice_Manual.pdf). Will it even go into self test mode at all?

    Dave

    Hi Daver2!!
    I saw Atari service manual and i read that red or brown screen can be caused by UC 2-5, 18, 19, 28 or 30

  4. #4
    Join Date
    Sep 2012
    Location
    Indiana, USA
    Posts
    511

    Default

    If your 800XL has it's main chips socketed, you should try re-seating all of them. If you are using the original Atari power supply it would be wise to check it as well.

  5. #5

    Default

    Quote Originally Posted by fatwizard View Post
    If your 800XL has it's main chips socketed, you should try re-seating all of them. If you are using the original Atari power supply it would be wise to check it as well.

    I have original power supply and voltages are correct....i tested all ic ram and they works correctly...

  6. #6

    Default

    In Atari s' manual i founded these logic reading in normal status:
    Schermata 2019-12-26 alle 15.27.31.png
    Schermata 2019-12-26 alle 15.27.56.png

  7. #7

    Default

    I tested with my logic probe and i founded some troubles:

    U2:
    1:H
    2:L
    3:0
    4:H
    10:H
    11:H
    12:H
    13:H
    14:H
    15:H
    16:H

    U3:
    1:L
    2:L
    3:L
    4:L
    5:L
    17:H
    18:H

    U4:
    8:L

    U5:
    10:L

  8. #8

    Default

    Please @daver2 can you help also here??

    I ve bought another 800xl atari but when i turn on, he starts alaways with ram self test mode...i tryied to press "option" key but nothing change....

  9. #9
    Join Date
    Jun 2012
    Location
    UK - Worcester
    Posts
    3,543

    Default

    I will have another look at the weekend if that is OK.

    Dave

  10. #10

    Default

    I tested all ram chips and are all ok...i changed the 2 roms from a good 800 xl but nothing change...
    Please can you help me to test with scope or logic probe??

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •