Help with a Video Ram Error on Mvs MV-1FZS

SELUXL

n00b
Joined
Jul 8, 2017
Posts
8
Hello!
I hope that someone in this forum could help me With a Video Ram Error on a mvs mv1fzs board.
I replaced the bios With de diag bios, fixed a broken trace but now I have another video ram error.
The diag bios identified the error as:

VRAM DATA (0000)

Adress: 000000
Actual: 4000
Expected: 0000

I have checked again all traces and seems to be ok, could it be that one or both surface mounted slow vram chips are bad? Or a broken trace that I am unable to find?
Do anyone have the ram5 and ram6 (slow vrams) pinouts to check it again in a better way?

Thank you in advance.
 

pnauts

Kuroko's Training Dummy
Joined
Jun 7, 2017
Posts
76
if it's CXA43256
adresses are:
10
9
8
7
6
5
4
3
25
24
21
23
2
26
1

datas
11
12
13
15
16
17
18
19

all shall goes to a LSPC
 

SELUXL

n00b
Joined
Jul 8, 2017
Posts
8
Thank you pnauts, but I do not understand the pinouts you posted.
I Know that all the legs of the ram5 and ram6 goes to some lspc2 legs, but do you Know the exact pinout leg by leg?
Example:

RAM5 LEG: 1 LSPC2 LEG: 5

1-5

ETC..

VRAM chips in this board are a couple of lh52b256n-70 chips.
 
Last edited:

SELUXL

n00b
Joined
Jul 8, 2017
Posts
8
I have replaced the four Vrams, both slow a fast, checked all the traces and seems to be ok
But The error persists.
Time to think about a bad LSPC2? I do not Know what to do now..
 

dragonpt

Over Top Auto Mechanic
10 Year Member
Joined
Oct 19, 2008
Posts
867
Had all sorts of this errors in one.

After replaced all the rams, same thing...

So ye, what really fixed it, was the ic
 

GadgetUK

Ace Ghost Pilot
Joined
Sep 27, 2013
Posts
1,323
Hello!
I hope that someone in this forum could help me With a Video Ram Error on a mvs mv1fzs board.
I replaced the bios With de diag bios, fixed a broken trace but now I have another video ram error.
The diag bios identified the error as:

VRAM DATA (0000)

Adress: 000000
Actual: 4000
Expected: 0000

I have checked again all traces and seems to be ok, could it be that one or both surface mounted slow vram chips are bad? Or a broken trace that I am unable to find?
Do anyone have the ram5 and ram6 (slow vrams) pinouts to check it again in a better way?

Thank you in advance.

Take a look at the AES schematics (because they are clearer), and check your CS, OE, WE pins. Connected to the LSPC2 as pnauts mentioned. Could just be bad RAM.
 
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