AES no sprites, unibios 3.2 gives off screen error

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GoodTofuFriday

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Hello all, thanks in advanced for any help.

I got an aes today, the sprites load for a second then disappear. Popped out the JP bios and put in unibios 3.2

Hardware test gives me 0000800 0000 0100
From reading around the issue may be with on the fast vrams or a trace to it. But I thought I'd ask to avoid unnecessary ic removals.

Here is a picture of the error: http://imgur.com/0WEsAAX

Once again thanks!
 
Xian Xi

Xian Xi

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Since it's mostly zeros, it means that it's missing control signals. Check the /CE, /OE and /WE lines on the RAM.
 
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GoodTofuFriday

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Thanks for the reply Xian. When I went over the traces I didn't see any issues, but I will jump those 6 traces just to be sure. I'll reply back tonight once Ive worked on it.
 
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GoodTofuFriday

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Removed the sockets and with doing continuity test the pins you mentioned are fine. oe/ce seem grounded while w/e goes to the lspc2.

Im posting a picture of the top side without chips since it doesnt seem to exist on the net. All the traces pass except the obviously broken one.

fOAkw2V.jpg
 
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Xian Xi

Xian Xi

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That's the fast video ram, the screen RAM is the main video ram which are the two at the top of the pic.
 
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GoodTofuFriday

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Xian Xi said:
That's the fast video ram, the screen RAM is the main video ram which are the two at the top of the pic.
Click to expand...

Well I feel silly.

Just tested continuity o all the pins on both chips, they all connect to the lsps2. Should I bother with swapping then to see what happens or just order new chips?
 
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Xian Xi

Xian Xi

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GoodTofuFriday said:
Well I feel silly.

Just tested continuity o all the pins on both chips, they all connect to the lsps2. Should I bother with swapping then to see what happens or just order new chips?
Click to expand...

Well, not really, 8000 error usually means it's the fast video RAM but if the RAM tests good then it could be the regular VRAM. If the fast RAM tests good and continuity is 100% then could be a bad LSPC2. If you have an eprom reader that tests RAM you can see if the fast RAM is good. I usually run 10 back to back tests. You can also try burning a diagnostics bios and you can test specific ram with it, you will need to have a cart inserted in the slot when doing it as for the AES it needs a cart for the S1 to write text to the screen. I hope it's just bad RAM.
 
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GoodTofuFriday

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Xian Xi said:
Well, not really, 8000 error usually means it's the fast video RAM but if the RAM tests good then it could be the regular VRAM. If the fast RAM tests good and continuity is 100% then could be a bad LSPC2. If you have an eprom reader that tests RAM you can see if the fast RAM is good. I usually run 10 back to back tests. You can also try burning a diagnostics bios and you can test specific ram with it, you will need to have a cart inserted in the slot when doing it as for the AES it needs a cart for the S1 to write text to the screen. I hope it's just bad RAM.
Click to expand...

I got another AES in. I swapped out the screen ram with sony cxk58256-12L. Same issue sadly.

I do have an eeprom reader/burner. No chips right now to make a diag bios though.
 
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Xian Xi

Xian Xi

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GoodTofuFriday said:
I got another AES in. I swapped out the screen ram with sony cxk58256-12L. Same issue sadly.

I do have an eeprom reader/burner. No chips right now to make a diag bios though.
Click to expand...

Test the fast RAM if your reader can test it. If you need me to burn you a bios just hit me up.
 
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GoodTofuFriday

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Xian Xi said:
Test the fast RAM if your reader can test it. If you need me to burn you a bios just hit me up.
Click to expand...

I have a tl866. Not sure if that can test these, or anything.

I have two official(?) Unibios 2.3 coming in the mail. I'll put diag on one of them.
 
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GoodTofuFriday

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Xian Xi said:
Test the fast RAM if your reader can test it. If you need me to burn you a bios just hit me up.
Click to expand...

Finally got around to doing this.

I get

Vram Address (A8-A10/A8-A14)
Address 008000
Actual: 0101
Expected: 0000

I also got the following

Z80 dead/errored/comm. issue

expected C3
actual: 3F
 
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