[Vectrex video problems]

Hi guys, how are you?

I bought this Vectrex console that has a defect in the screen
do you think it can be repaired? It appears that the image is shifted all the way to the right and is compressed ...
This video shows the defect, can someone help me to repair please?

 

https://www.youtube.com/watch?v=jP1SRMHmfZk

 

Thanks so much!

 

[Atari 800Xl brown screen]

I changed also U2 and U3 but always red screen

I tested with my logic probe pin 1-2-3 and 4 of ic rams and i saw that pins 3-4 are low and seems low or open..

[Atari 800Xl brown screen]

I founded that U2 pin4 and U3 pin17 are open...no signal

[Atari 800Xl brown screen]

Quote

 

The are measures with logic probe on Cpu:

CPU:

 

9=PULSE

10=PULSE

11=PULSE

12=PULSE

13=PULSE

14=PULSE

15=PULSE

16=PULSE

17=LOW

18=LOW

19=NO SIGNAL

20=HIGH

22=LOW

23=LOW

24=LOW

25=LOW

 

26=PULSE

27=LOW

28=LOW

29=LOW

30=LOW

31=LOW

32=LOW

33=LOW

[Atari 800Xl brown screen]

2 minutes ago, DrVenkman said:

Use your scope or logic probe to check the address and data lines on one of the main ICs. Compare to a working 800XL if possible and the difference(s) should be apparent. For SALLY, address lines are pins 9-20 and 22-25, and the data lines are pins 26-33.

Thanks so much!9 to 20 and 22 to 25 ok?

[Atari 800Xl brown screen]

15 hours ago, bob1200xl said:

You may have a 'stuck' address or data bit. Watch each bit to see if it cycles when you power on. A brown screen usually means the power on fails early in the process.

 

Bob

Where i can see this bit??

[Atari 800Xl brown screen]

Yes...i changed with another cpu taken from another 800xl and nothing changes...

I have a logic probe....it's possibile find the damage?

 

[Atari 800Xl brown screen]

Hi, Rom,MMu and Ram are good...:(

Unfortunately i don't have Star Raiders cart...

[Atari 800Xl brown screen]

Davide

•  Topic Starter
• Combat Commando
• 
• 1 post

• Report post
•  
•  
•  
• #1

Posted 21 hours ago

Hi guys,im Davide from Milan,

i have an 800Xl Atari...when i try to turn on, i can see only brown screen 

I try to change some ic from another working 800 but nothing change....

I changed this:

U2-OK

U3-OK

U4-OK

U5-OK

U18-OK

U19-OK

U28-OK

U30-OK

U23-OK

U17-OK

U29-OK

 

Can someone help me to try damage please?

I have digital multimeter, logic probe and mini scope....

Thanks!

[Atari 800Xl brown screen]

13 hours ago, Trebor said:

Hi Davide,

 

You'll likely find better support for the Atari 800XL posting here:

 

https://atariage.com/forums/forum/12-atari-8-bit-computers/

Sorry!!i was wrong!

[Atari 800Xl brown screen]

Hi guys,im Davide from Milan,

i have an 800Xl Atari...when i try to turn on, i can see only brown screen :(

I try to change some ic from another working 800 but nothing change....

I changed this:

U2-OK

U3-OK

U4-OK

U5-OK

U18-OK

U19-OK

U28-OK

U30-OK

U23-OK

U17-OK

U29-OK

 

Can someone help me to try damage please?

I have digital multimeter, logic probe and mini scope....

Thanks!