Game Gear Mainboard 315-5378

This is a brand-new manufactured replacement mainboard for your Sega Game Gear, using all new components. The board makes it possible to repair your VA0 (dual-ASIC) model Game Gear which suffers from PCB damage caused by leaking capacitors or batteries.

​The board has been reverse engineered from a Sega Game Gear VA0 model, better known as the dual-ASIC variant. Since I am not able to source new ASIC chips, cartridge connectors and expansion port connections, you need to supply these parts from one of your broken boards.

Recommended tools are:
  • Soldering iron with 1-1.5mm chisel tip
  • Hot air rework station
  • Desoldering gun or pump
  • Flux
  • IPA
  • Multimeter and/or oscilloscope
Highlevel workplan:
  • Source broken Sega Game Gear dual-ASIC mainboard; working chips are:
    • IC1 Toshiba 84C00AM-6
    • IC2 SEGA 315-5377 VDP ASIC
    • IC3 SEGA 315-5378A or 315-5378B SCA ASIC
  • Remove cartridge slot and expansion port using de-solder gun
  • Remove above chips with hot-air and clean pins with solder wick
  • Align the above chips on the new board – it should snug into position using the solder mask
  • Tack few pins on the edges
  • Apply flux and drag solder all pins of the ASIC – remove solder bridges with solder wick
  • Solder XTAL, LED, cartridge connector power and sound cable
  • The region is default selected to rest-of-world, in case you want change it to Japanese, switch the small switch next to the audio connector
  • Validate installation with starting a game – you should hear game sound
  • Install LCD kit
  • Assemble the shell
  • Enjoy another 30 years of playing on a Game Gear!
Installation video coming soon!
The following table can be used to connect a LCD kit to the mainboard:
MAINBOARD  BennVenn Cleanscreen Funnyplaying GGLCD MagicScreen ASIC
SMS SMS SMS SMS MODE GG/SMS /GG
CLK CLK PCLK CLK 32M XTL2
GND GROUND GND GND GND GND GND
RES RES VSYNC DW0 DW DW0
D0 D0 D1 D0 D1 D1 D1
D3 D3 D2 D3 D4 D4 D4
D2 D2 D0 D2 D3 D3 D3
D1 D1 D3 D1 D2 D2 D2
CL2 CL2 HSYNC CL2 CL2 CL2 CL2
5V 5V 5V VCC 5V 5V VCC
BL1 BRIGHTNESS WHL+ P1 BL1 -
BTS 1 START BUT3 START /PS
BTU 2 /UP
BTD 3 /DW
BT1 BUT1 /TL
BT2 2 BUT2 BTN2 /TR
BTL LEFT /LE
BTR /RI
CS CSYNC CSYNC CSYNC CSYNC
BL2 WHL- P2 N/C BL2 -
In case you install a BennVenn kit – bridge the BV solder pad next to the brightness wheel.
The kit includes:
  • Brand new mainboard - all surface mount parts are assembled
  • 5-pin contrast wheel
  • 9-pin power board cable with AMP CT connector
  • 6-pin sound board cable with AMP CT connector
  • 32.2160MHz crystal
  • 3mm red/green LED - switch polarity if you want a different color
BOM:
Name Value Package LCSC Part
C4 100nF 0603 C14663
C5 100nF 0603 C14663
C6 10uF 0603 C326057
C7 100nF 0603 C14663
C8 330nF 0603 C107070
C9 330nF 0603 C107070
C10 330nF 0603 C107070
C11 330nF 0603 C107070
C12 100nF 0603 C14663
C14 100nF 0603 C14663
C15 5pF 0603 C327203
C16 5pF 0603 C327203
C17 1uF 1206 C11363
C18 8.2nF 0603 C113812
C19 100nF 0603 C14663
C20 1uF 1206 C11363
C21 1uF 1206 C11363
C22 8.2nF 0603 C113812
C23 1uF 1206 C11363
C24 2.2nF 0603 C107082
C25 2.2nF 0603 C107082
C26 2.2nF 0603 C107082
C27 2.2nF 0603 C107082
C28 2.2nF 0603 C107082
C29 2.2nF 0603 C107082
C30 2.2nF 0603 C107082
C48 10uF 0603 C326057
C49 22uF 0603 C109447
C51 100nF 0603 C14663
C59 39pF 0603 C107049
C60 39pF 0603 C107049
C61 39pF 0603 C107049
C62 39pF 0603 C107049
C73 39pF 0603 C107049
C74 39pF 0603 C107049
C75 120pF 0603 C107035
C76 22nF 0603 C106222
C82 68pF 0603 C62782
C83 33pF 0603 C107047
C84 5pF 0603 C327203
C85 33pF 0603 C107047
C86 10uF 0603 C326057
C87 100nF 0603 C14663
C89 22pF 0603 C105620
C90 100nF 0603 C14663
CN5 F1004-H-14-20G-R SMD C283167
CN6 F0504-H-10-20T-R SMD C283142
CN7 F0504-H-10-20T-R SMD C283142
D4 PD3S230 DI323 C212293
E1 2.2nFx2 0603 C96589
E2 2.2nFx2 0603 C96589
E3 2.2nFx2 0603 C96589
E4 2.2nFx2 0603 C96589
E5 2.2nFx2 0603 C96589
E6 2.2nFx2 0603 C96589
E7 2.2nFx2 0603 C96589
E8 2.2nFx2 0603 C96589
IC1 TMP84C00 SSOP40
IC2 315-5377 QFP80
IC3 315-5378 QFP100
IC3 HM65256 SOIC-28
IC3 LY6264SL-70LLI SOIC-28 C14323
IC4 LM358 SOIC-8 C74525
L1 100R@100MHz 0603 C142080
L3 100uH 1206 C165807
R1 4.7K 0603 C99782
R2 4.7K 0603 C99782
R3 4.7K 0603 C99782
R4 4.7K 0603 C99782
R5 4.7K 0603 C99782
R6 4.7K 0603 C99782
R7 470K 0603 C114622
R8 470K 0603 C114622
R9 470K 0603 C114622
R10 470K 0603 C114622
R11 3K 0603 C126358
R12 4.7K 0603 C99782
R13 1.8K 0603 C185354
R14 51R 0603 C114628
R20 1K 0603 C22548
R21 1K 0603 C22548
R22 10K 0603 C98220
R23 1K 0603 C22548
R24 1K 0603 C22548
R25 10K 0603 C98220
R26 47K 0603 C105579
R27 47K 0603 C105579
R48 10K 0603 C98220
R49 10K 0603 C98220
R50 9.1K 0603 C114639
R51 1.1K 0603 C137780
R52 3K 0603 C126358
R54 220R 0603 C107696
R55 220R 0603 C107696
R56 220R 0603 C107696
R57 220R 0603 C107696
R65 1K 0603 C22548
R66 10K 0603 C98220
R67 10K 0603 C98220
R68 3K 0603 C126358
SW1 SSSS811101 C109335