PGM IGS extreme battery leakage

Apocalypse

Edo Express Delivery Guy
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Sep 16, 2015
Posts
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I'm trying to fix a PGM IGS board which has an extreme battery leakage.
Unfortunately few info is available online.
For instance my board is stuck on a green/yellowish garbage screen and I'm not sure of the behaviour the board should have if for example the backup RAMs are unwritable/unreadable (broken traces).
I will try to detail connections between ICs:

U2
LP61256FS-15
32K * 8 BIT HIGH SPEED CMOS RAM
1 A14 U6 102
2 A12 U6 100
3 A7 U6 95
4 A6 U6 94
5 A5 U6 93
6 A4 U6 92
7 A3 U6 91U2
8 A2 U6 90
9 A1 U6 89
10 A0 U6 88
11 I/O0 U6 103
12 I/O1 U6 104
13 I/O2 U6 105
14 GND
15 I/O3 U6 106
16 I/O4 U6 110
17 I/O5 U6 111
18 I/O6 U6 112
19 I/O7 U6 113
20 /CE U7 16
21 A10 U6 98
22 /OE U6 87
23 A11 U6 99
24 A9 U6 97
25 A8 U6 96
26 A13 U6 101
27 /WE U6 86
28 VCC

U3
LP61256FS-15
32K * 8 BIT HIGH SPEED CMOS RAM
1 A14 U6 102
2 A12 U6 100
3 A7 U6 95
4 A6 U6 94
5 A5 U6 93
6 A4 U6 92
7 A3 U6 91
8 A2 U6 90
9 A1 U6 89
10 A0 U6 88
11 I/O0 U6 114
12 I/O1 U6 115
13 I/O2 U6 116
14 GND
15 I/O3 U6 117
16 I/O4 U6 118
17 I/O5 U6 119
18 I/O6 U6 120
19 I/O7 U6 121
20 /CE U7 15
21 A10 U6 98
22 /OE U6 87
23 A11 U6 99
24 A9 U6 97
25 A8 U6 96
26 A13 U6 101
27 /WE U6 86
28 VCC

To be continued...
 
Last edited:

aha2940

AH, A, COLUMBIAN!,
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Dec 15, 2013
Posts
2,528
If you need high res pics of a working PGM board, let us know :)
 

Apocalypse

Edo Express Delivery Guy
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Posts
331
If you need high res pics of a working PGM board, let us know :)
It can't harm ;)
Schematics would be a plus but they don't seem to be available.
At least with the details I give here someone could draw one.
 

Apocalypse

Edo Express Delivery Guy
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Posts
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I patched a dozen of traces or so and got little improvement:

TRAP 6 error:
DSCN4475.JPG

OPCODE 1111 error:
DSCN4476.JPG

And last but not least HOST FUN ERROR:
DSCN4481.JPG
 

Xian Xi

JammaNationX,
15 Year Member
Joined
Dec 1, 2005
Posts
27,748
Check the /CLK line that goes to the cart slot.
 

Apocalypse

Edo Express Delivery Guy
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Check the /CLK line that goes to the cart slot.
Will do.
However I forgot to mention that it's what I get with an empty slot (no game).
If I manage to get it boot to the menu I'll buy a game (I already know several traces going to the cart slot are bad).
 

Apocalypse

Edo Express Delivery Guy
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There's something wrong with the RESET signal of the 68000 (pin 20). I haven't been able to fully track it down, it splits to each sides of the board and seems to be connected on one side to U5. However I can't read a low resistance (probably the cause why the signal is "weak").
Xian Xi can you check it on a working one? I think the /UDS (pin 7) signal is connected to pin 69 of U5.
 

Xian Xi

JammaNationX,
15 Year Member
Joined
Dec 1, 2005
Posts
27,748
Ah, I don't have a working one. I do know that the clock goes to the cart and connects to a quad flat pack.
 

Apocalypse

Edo Express Delivery Guy
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Sep 16, 2015
Posts
331
I fixed 68k(20) - U5(70).
I think 2 other traces go from the 68k to U5 : R/W(9) and /IPLO(27).
Can you check them?
 
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