SEGA Game Gear Majesco
Here you will find repair resources for the SEGA Game Gear Majesco 171-7923A model. Currently there is still some work-in-progress for the schematics, but we will keep updating it!
GAME GEAR MAIN USA 171-7923A Board scans
BOM
I disassembled all parts by hand and measued them with my LCM meter. So far this is the result of the GameGear Majesco BOM.
| Designator |
Value |
Package |
Description |
| C1 |
33uF/6V |
ECAP 8x4.5mm |
|
|
| C2 |
|
|
|
|
| C3 |
|
|
|
|
| C4 |
33nF |
0805 |
|
|
| C5 |
NC |
0805 |
|
|
| C6 |
68pF |
0805 |
|
|
| C7 |
NC |
0805 |
|
|
| C8 |
|
|
|
|
| C9 |
|
|
|
|
| C10 |
|
|
|
|
| C11 |
270pF |
0603 |
|
|
| C12 |
270pF |
0603 |
|
|
| C13 |
270pF |
0603 |
|
|
| C14 |
270pF |
0603 |
|
|
| C15 |
270pF |
0603 |
|
|
| C16 |
270pF |
0603 |
|
|
| C17 |
270pF |
0603 |
|
|
| C18 |
270pF |
0603 |
|
|
| C19 |
270pF |
0603 |
|
|
| C20 |
2.2nF |
0805 |
|
|
| C21 |
2.2nF |
0805 |
|
|
| C22 |
2.2nF |
0805 |
|
|
| C23 |
2.2nF |
0805 |
|
|
| C24 |
2.2nF |
0805 |
|
|
| C25 |
2.2nF |
0805 |
|
|
| C26 |
2.2nF |
0805 |
|
|
| C27 |
22pF |
0805 |
|
|
| C28 |
22pF |
0805 |
|
|
| C29 |
120nF |
0805 |
|
|
| C30 |
120nF |
0805 |
|
|
| C31 |
10uF / 6V |
ECAP 6x3.5mm |
|
|
| C32 |
120nF |
0805 |
|
|
| C33 |
10uF / 6V |
ECAP 6x3.5mm |
|
|
| C34 |
120nF |
0805 |
|
|
| C35 |
10uF / 6V |
ECAP 6x3.5mm |
|
|
| C36 |
22uF / 6V |
ECAP 6x4.5mm |
|
|
| C37 |
10uF / 6V |
ECAP 6x3.5mm |
|
|
| C38 |
|
|
|
|
| C39 |
10uF / 50V |
|
|
|
| C40 |
47uF / 6V |
ECAP 8x4.5mm |
|
|
| C41 |
22uF / 6V |
|
|
|
| C42 |
10uF / 50V |
|
|
|
| C43 |
1uF / 50V |
ECAP 6x3.5mm |
|
|
| C44 |
|
|
|
|
| C45 |
120nF |
0805 |
|
|
| C46 |
|
|
|
|
| C47 |
10uF / 50V |
|
|
|
| C48 |
|
|
|
|
| C49 |
1uF / 16V |
1812 |
|
|
| C50 |
1uF / 16V |
1812 |
|
|
| C51 |
1uF / 16V |
1812 |
|
|
| C52 |
1uF / 16V |
1812 |
|
|
| C53 |
8.2nF |
0805 |
|
|
| C54 |
8.2nF |
0805 |
|
|
| C55 |
100uF / 6V |
|
|
|
| C56 |
33nF |
0805 |
|
|
| C57 |
|
|
|
|
| C58 |
|
|
|
|
| C59 |
33nF |
0805 |
|
|
| C60 |
|
|
|
|
| C61 |
NC |
0805 |
|
|
| C62 |
|
|
|
|
| C63 |
|
|
|
|
| C64 |
270pF |
0603 |
|
|
| C65 |
270pF |
0603 |
|
|
| C66 |
270pF |
0603 |
|
|
| C67 |
|
|
|
|
| C68 |
|
|
|
|
| C69 |
270pF |
0603 |
|
|
| C70 |
|
|
|
|
| C71 |
10uF / 6V |
ECAP 6x3.5mm |
|
|
| C72 |
|
|
|
|
| C73 |
100pF |
0805 |
|
|
| C74 |
100pF |
0805 |
|
|
| C75 |
|
|
|
|
| C76 |
470nF |
0805 |
|
|
| C77 |
470nF |
0805 |
|
|
| C78 |
470nF |
0805 |
|
|
| C79 |
470nF |
0805 |
|
|
| R1 |
4.7K |
0603 |
|
|
| R2 |
4.7K |
0603 |
|
|
| R3 |
4.7K |
0603 |
|
|
| R4 |
4.7K |
0603 |
|
|
| R5 |
470K |
0603 |
|
|
| R6 |
470K |
0603 |
|
|
| R7 |
470K |
0603 |
|
|
| R8 |
470K |
0603 |
|
|
| R9 |
470R |
0805 |
|
|
| R10 |
4.7K |
0805 |
|
|
| R11 |
4.7K |
0805 |
|
|
| R12 |
470R |
0603 |
|
|
| R13 |
470R |
0603 |
|
|
| R14 |
470R |
0603 |
|
|
| R15 |
470R |
0603 |
|
|
| R16 |
470R |
0603 |
|
|
| R17 |
470R |
0603 |
|
|
| R18 |
470R |
0603 |
|
|
| R19 |
470R |
0603 |
|
|
| R20 |
470R |
0603 |
|
|
| R21 |
1.8K |
0805 |
|
|
| R22 |
51R |
0805 |
|
|
| R23 |
9.1K |
0805 |
|
|
| R24 |
3K |
0805 |
|
|
| R25 |
1.1K |
0805 |
|
|
| R26 |
10K |
0805 |
|
|
| R27 |
10K |
0805 |
|
|
| R28 |
|
|
|
|
| R29 |
|
|
|
|
| R30 |
|
|
|
|
| R31 |
33K |
0805 |
|
|
| R32 |
22K |
0805 |
|
|
| R33 |
100K |
0805 |
|
|
| R34 |
180K |
0805 |
|
|
| R35 |
27K |
0805 |
|
|
| R36 |
150K |
0805 |
|
|
| R37 |
20K |
0805 |
|
|
| R38 |
100K |
0805 |
|
|
| R39 |
|
|
|
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| R40 |
|
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|
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| R41 |
|
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| R42 |
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| R43 |
|
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| R44 |
|
|
|
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| R45 |
18K |
0805 |
|
|
| R46 |
18K |
0805 |
|
|
| R47 |
18K |
0805 |
|
|
| R48 |
2.2K |
0805 |
|
|
| R49 |
|
|
|
|
| R50 |
16K |
0805 |
|
|
| R51 |
16K |
0805 |
|
|
| R52 |
16K |
0805 |
|
|
| R53 |
47K |
0805 |
|
|
| R54 |
47K |
0805 |
|
|
| R55 |
1K |
0805 |
|
|
| R56 |
1K |
0805 |
|
|
| R57 |
1K |
0805 |
|
|
| R58 |
1K |
0805 |
|
|
| R59 |
10K |
0805 |
|
|
| R60 |
10K |
0805 |
|
|
| R61 |
1.8K |
0805 |
|
|
| R62 |
1.8K |
0805 |
|
|
| R63 |
130K |
0805 |
|
|
| R64 |
|
|
|
|
| R65 |
|
|
|
|
| R66 |
|
|
|
|
| R67 |
4.7K |
0805 |
|
|
| R68 |
1K |
0805 |
|
|
| R69 |
|
|
|
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| R70 |
|
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|
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| R71 |
|
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|
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| R72 |
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| R73 |
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| R74 |
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| R75 |
|
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| R76 |
|
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| R77 |
|
|
|
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| R78 |
|
|
|
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| R79 |
|
|
|
|
| R80 |
150K |
0805 |
|
|
| R81 |
20K |
0805 |
|
|
| R82 |
100K |
0805 |
|
|
| R85 |
47K |
1206 |
|
|
| Q1 |
|
|
|
|
| Q2 |
ZR |
|
|
|
| Q3 |
1VS |
|
|
|
| Q4 |
ZR |
|
|
|
| Q5 |
BR |
|
|
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| Q6 |
ZR |
|
|
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| Q7 |
|
|
|
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| Q8 |
ZR |
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|
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| Q9 |
ZR |
|
|
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| Q10 |
ZR |
|
|
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| Q11 |
ZR |
|
|
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| Q12 |
XK |
|
|
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| Q13 |
XK |
|
|
|
| Q20 |
ZR |
|
|
|
| Q21 |
BR |
|
|
|
| D1 |
B3 |
|
|
|
| D2 |
MO |
|
|
|
| D3 |
MS |
|
|
|
| D4 |
ZR |
SOT-23 |
|
|
| D5 |
MS |
|
|
|
| D6 |
B3 |
SOT-23 |
|
|
| D7 |
|
|
|
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| D8 |
|
|
|
|
| FU1 |
|
|
|
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| FU2 |
|
|
|
|
| L1 |
FERRITE BEAD |
|
|
|
| L2 |
100uH |
|
|
|
| L3 |
|
|
|
|
| L4 |
|
|
|
|
| IC1 |
SEGA 315-5682 |
|
|
|
| IC2 |
|
|
|
|
| IC3 |
KM6264BLG-10 |
|
|
|
| IC4 |
10358 |
|
|
|
| VR1 |
|
|
|
|
| X1 |
32.21590MHz |
|
|
|
SEGA 315-5682 Pinout
The SEGA 315-5682 chip is used by the VA4 / VA5 and Majesco variants. So far I have traced back the majority of the traces and made the following pinout. Most of the pinout is based on the VA1 SEGA 315-5535 chip. Still work in progress!
| No |
Pin Name |
|
No |
Pin Name |
|
No |
Pin Name |
|
No |
Pin Name |
| 1 |
Vdd |
|
37 |
GND |
|
73 |
Vdd |
|
109 |
GND |
| 2 |
A0 |
|
38 |
NGG |
|
74 |
AD10 |
|
110 |
CSYNC / 15.69KHz |
| 3 |
A1 |
|
39 |
NTV |
|
75 |
AD11 |
|
111 |
NUP |
| 4 |
A2 |
|
40 |
NLCD |
|
76 |
AD12 |
|
112 |
NDW |
| 5 |
A3 |
|
41 |
Needs to be low to boot |
|
77 |
AD13 |
|
113 |
NLE |
| 6 |
A4 |
|
42 |
NC / 7.85KHz |
|
78 |
AD14 |
|
114 |
NRI |
| 7 |
A5 |
|
43 |
NC / 59.9Hz |
|
79 |
NWE |
|
115 |
NC << |
| 8 |
A6 |
|
44 |
LCD 53 / 59.9Hz |
|
80 |
NOE |
|
116 |
TST1? |
| 9 |
A7 |
|
45 |
LCD 58 / 15.69KHz |
|
81 |
NCE |
|
117 |
TST0? |
| 10 |
A8 |
|
46 |
LCD 54 / 7.85KHZ |
|
82 |
GND (A) |
|
118 |
NTSC |
| 11 |
A9 |
|
47 |
LCD 11/27/53 / 7.85KHz |
|
83 |
VONF |
|
119 |
SEC |
| 12 |
A10 |
|
48 |
NC (high) |
|
84 |
VRES |
|
120 |
PC6 |
| 13 |
A11 |
|
49 |
LCD 10/26/52 / 3.85MHz |
|
85 |
VREF |
|
121 |
PC5 |
| 14 |
A12 |
|
50 |
LCD 9/25/51 / 3.85MHz |
|
86 |
SNDR |
|
122 |
PC4 |
| 15 |
A13 |
|
51 |
NC (high) |
|
87 |
SNDL |
|
123 |
PC3 |
| 16 |
A14 |
|
52 |
LCD 17x3 (data) |
|
88 |
SND1 |
|
124 |
PC2 |
| 17 |
A15 |
|
53 |
LCD 16x3 (data) |
|
89 |
SND2 |
|
125 |
PC1 |
| 18 |
GND |
|
54 |
LCD 15x3 (data) |
|
90 |
SND3 |
|
126 |
PC0 |
| 19 |
D0 |
|
55 |
LCD 14x3 (data) |
|
91 |
SND4 |
|
127 |
CRAM |
| 20 |
D1 |
|
56 |
LCD 13x3 (data) |
|
92 |
Vdd (A) |
|
128 |
IRQ |
| 21 |
D2 |
|
57 |
LCD 12x3 (data) |
|
93 |
GND (A) |
|
129 |
NWE |
| 22 |
D3 |
|
58 |
LCD CS3 / LCD 50 |
|
94 |
SDO1 |
|
130 |
NRD |
| 23 |
D4 |
|
59 |
LCD CS2 / LCD 44 |
|
95 |
SDO2 |
|
131 |
RST |
| 24 |
D5 |
|
60 |
LCD CS1 / LCD 18 |
|
96 |
SDO3 |
|
132 |
NC |
| 25 |
D6 |
|
61 |
AD0 |
|
97 |
SDO4 |
|
133 |
T13 / 15,69KHz |
| 26 |
D7 |
|
62 |
AD1 |
|
98 |
Vdd (A) |
|
134 |
NC |
| 27 |
MRQ |
|
63 |
AD2 |
|
99 |
SAMP |
|
135 |
NC |
| 28 |
EXM1 |
|
64 |
AD3 |
|
100 |
SPON |
|
136 |
Vdd |
| 29 |
EXM2 |
|
65 |
AD4 |
|
101 |
NC |
|
137 |
XTL2 |
| 30 |
VCK? |
|
66 |
AD5 |
|
102 |
NC |
|
138 |
XTL1 |
| 31 |
CCK |
|
67 |
AD6 |
|
103 |
NC |
|
139 |
GND |
| 32 |
NPS |
|
68 |
AD7 |
|
104 |
NC |
|
140 |
NLED |
| 33 |
NTR |
|
69 |
AD8 |
|
105 |
WAIT |
|
141 |
RSH |
| 34 |
NTL |
|
70 |
AD9 |
|
106 |
NBRQ |
|
142 |
NJAP |
| 35 |
NMI |
|
71 |
GND |
|
107 |
NC |
|
143 |
GND |
| 36 |
Vdd |
|
72 |
GND |
|
108 |
Vdd |
|
144 |
GND |
