# Nintendo NES

# Mainboard Revisions (NTSC)

PCB revisions run from NES-CPU-01 to -11. Revisions below -05 will have noticeably poorer video output than later revisions. Revisions -10 and -11 use circuitry to try to defeat the lockout defeaters of the unlicensed cartridges.

#### **NES-CPU-02 - 2A03E/2C02E-0**

The original US release of the NES (fewer than 10,000 were made).

<div class="description" id="bkmrk-1985-copyright-on-pc">- 1985 copyright on PCB
- VRAM and WRAM are NDIP-only
- 3193 Non-A CIC

</div>#### **NES-CPU-03**

<div class="description" id="bkmrk-unreleased">- Unreleased

</div>#### **NES-CPU-04 - 2A03E/2C02E-0**

<div class="description" id="bkmrk-1986-copyright-on-pc">- 1986 copyright on PCB
- VRAM and WRAM are NDIP-only
- 3193 Non-A or 3193A CIC
- some have a 74HC139 at U3 instead of 74LS139

</div>#### **NES-CPU-05 - 2A03G/2C02G-0**

<div class="description" id="bkmrk-1986-copyright-on-pc-1">- 1986 copyright on PCB
- VRAM and WRAM are NDIP-only
- 3193A CIC

</div>#### **NES-CPU-06 - 2A03G/2C02G-0**

<div class="description" id="bkmrk-1987-copyright-on-pc">- 1987 copyright on PCB
- VRAM and WRAM are NDIP or DIP

</div>#### **NES-CPU-07 - 2A03G/2C02G-0**

<div class="description" id="bkmrk-1987-copyright-on-pc-1">- 1987 copyright on PCB
- VRAM and WRAM are NDIP or DIP

</div>#### **NES-CPU-08 - 2A03G/2C02G-0**

<div class="description" id="bkmrk-1989-copyright-on-pc">- 1989 copyright on PCB
- VRAM and WRAM are NDIP or DIP

</div>#### **NES-CPU-09 - 2A03G/2C02G-0 or 2A07/2C07-0**

<div class="description" id="bkmrk-1987-copyright-on-pc-2">- 1987 copyright on PCB
- VRAM and WRAM are NDIP or DIP

</div>Has one resistor between CIC pin and cart connector to prevent CIC stun attacks

#### **NES-CPU-10 - 2A03G/2C02G**

<div class="description" id="bkmrk-1987-copyright-on-pc-3">- 1987 copyright on PCB
- VRAM and WRAM are NDIP or DIP

</div>Has two resistors between CIC pins and cart connector to thwart more CIC voltage stun, some later revisions have a diode to nearby GND vias as well to prevent the -5V attack

#### **NES-CPU-11 - 2A03G/2C02G or 2A07\[A\]/2C07\[A\]** 

<div class="description" id="bkmrk-1987-copyright-on-pc-4">- 1987 Copyright on PCB
- VRAM and WRAM are NDIP or DIP

</div>Has two resistors and two diodes between CIC pins, cart connector and GND to prevent CIC stun and -5V attacks

# Product Sheets

# NES Mainboard (NTSC)

### **Capacitor Guide**

Capacitors play a crucial role in maintaining a steady flow of current to other components. With a typical lifespan of 20–30 years—and considering the age of most NES consoles—the original capacitors have likely reached or exceeded their expected service life. For optimal performance and reliability, replacing them is strongly recommended.

When installing new capacitors, be sure to observe the correct polarity. The longer lead indicates the positive side, which corresponds to the "+" symbol in the diagram.

<table border="1" id="bkmrk-capacitor-location-1" style="border-collapse: collapse; width: 100%; height: 119.2px;"><colgroup><col style="width: 28.1548%;"></col><col style="width: 71.9644%;"></col></colgroup><tbody><tr style="height: 29.8px;"><td style="height: 29.8px;">**Capacitor**</td><td style="height: 29.8px;">**Location**</td></tr><tr style="height: 29.8px;"><td style="height: 29.8px;">1uF 50v</td><td style="height: 29.8px;">C23</td></tr><tr style="height: 29.8px;"><td style="height: 29.8px;">100uF 6.3v</td><td style="height: 29.8px;">C1</td></tr><tr style="height: 29.8px;"><td style="height: 29.8px;">2.2uF 50v</td><td style="height: 29.8px;">C9</td></tr></tbody></table>

###  

### **Board Layout**

[![Screenshot 2025-05-25 at 8.47.38 AM.png](https://wiki.arcadesupply.co/uploads/images/gallery/2025-05/scaled-1680-/vwD1Ou5nl92Yb5kh-screenshot-2025-05-25-at-8-47-38-am.png)](https://wiki.arcadesupply.co/uploads/images/gallery/2025-05/vwD1Ou5nl92Yb5kh-screenshot-2025-05-25-at-8-47-38-am.png)

# Mitsumi Capacitor Kit

## Capacitor Guide

Capacitors play a crucial role in maintaining a steady flow of current to other components. With a typical lifespan of 20–30 years, and considering the age of most NES consoles, the original capacitors have likely reached or exceeded their expected service life. For optimal performance and reliability, replacing them is strongly recommended.

### Mitsumi TDK-T31V

<table border="1" id="bkmrk-capacitor-location-1" style="border-collapse: collapse; width: 100%; border-width: 1px; border-style: none;"><colgroup><col style="width: 33.3731%;"></col><col style="width: 4.32544%;"></col><col style="width: 62.4207%;"></col></colgroup><tbody><tr><td>[![Screenshot 2025-05-26 at 9.26.11 AM.png](https://wiki.arcadesupply.co/uploads/images/gallery/2025-05/scaled-1680-/YY3j6r5nIVHNblNo-screenshot-2025-05-26-at-9-26-11-am.png)](https://wiki.arcadesupply.co/uploads/images/gallery/2025-05/YY3j6r5nIVHNblNo-screenshot-2025-05-26-at-9-26-11-am.png)</td><td>  
</td><td><table border="1" style="border-collapse: collapse; width: 100.178%;"><colgroup><col style="width: 50.0891%;"></col><col style="width: 50.0891%;"></col></colgroup><tbody><tr><td style="height: 29.8px;">**Capacitor**</td><td style="height: 29.8px;">**Location**</td></tr><tr><td style="height: 29.8px;">100uF 10v

</td><td style="height: 29.8px;">C25</td></tr><tr><td style="height: 29.8px;">100uF 16v

</td><td style="height: 29.8px;">C22</td></tr><tr><td style="height: 29.8px;">10uF 16v

</td><td style="height: 29.8px;">C6</td></tr><tr><td style="height: 29.8px;">2200uF 25v

</td><td style="height: 29.8px;">C21</td></tr></tbody></table>

</td></tr></tbody></table>

### Mitsumi TDK-T12V

<table border="1" id="bkmrk-capacitor-location-1-1" style="border-collapse: collapse; width: 100%; border-width: 1px; border-style: none;"><colgroup><col style="width: 33.3717%;"></col><col style="width: 4.29065%;"></col><col style="width: 62.3336%;"></col></colgroup><tbody><tr><td>[![Screenshot 2025-05-26 at 9.31.57 AM.png](https://wiki.arcadesupply.co/uploads/images/gallery/2025-05/scaled-1680-/C5pdvJtHjUgqNrtF-screenshot-2025-05-26-at-9-31-57-am.png)](https://wiki.arcadesupply.co/uploads/images/gallery/2025-05/C5pdvJtHjUgqNrtF-screenshot-2025-05-26-at-9-31-57-am.png)</td><td>  
</td><td><table border="1" style="border-collapse: collapse; width: 100.178%;"><colgroup><col style="width: 50.0891%;"></col><col style="width: 50.0891%;"></col></colgroup><tbody><tr><td style="height: 29.8px;">**Capacitor**</td><td style="height: 29.8px;">**Location**</td></tr><tr><td style="height: 29.8px;">100uF 16v

</td><td style="height: 29.8px;">C29</td></tr><tr><td style="height: 29.8px;">2200uF 25v

</td><td style="height: 29.8px;">C8</td></tr><tr><td style="height: 29.8px;">100uF 25v

</td><td style="height: 29.8px;">C31</td></tr><tr><td style="height: 29.8px;">1uF 50v

</td><td style="height: 29.8px;">C2</td></tr><tr><td>10uF 16v

</td><td>C32</td></tr><tr><td>1uF 50v

</td><td>C6</td></tr></tbody></table>

</td></tr></tbody></table>

### Mitsumi MTM-8V-0

<table border="1" id="bkmrk-capacitor-location-1-2" style="border-collapse: collapse; width: 100%; border-width: 1px; border-style: none;"><colgroup><col style="width: 33.3731%;"></col><col style="width: 4.32544%;"></col><col style="width: 62.4207%;"></col></colgroup><tbody><tr><td>[![Screenshot 2025-05-26 at 9.32.51 AM.png](https://wiki.arcadesupply.co/uploads/images/gallery/2025-05/scaled-1680-/kY4n26EbhmcAVfyg-screenshot-2025-05-26-at-9-32-51-am.png)](https://wiki.arcadesupply.co/uploads/images/gallery/2025-05/kY4n26EbhmcAVfyg-screenshot-2025-05-26-at-9-32-51-am.png)</td><td>  
</td><td><table border="1" style="border-collapse: collapse; width: 100.178%;"><colgroup><col style="width: 50.0891%;"></col><col style="width: 50.0891%;"></col></colgroup><tbody><tr><td style="height: 29.8px;">**Capacitor**</td><td style="height: 29.8px;">**Location**</td></tr><tr><td style="height: 29.8px;">10uF 35v

</td><td style="height: 29.8px;">C5</td></tr><tr><td style="height: 29.8px;">100uF 16v

</td><td style="height: 29.8px;">C21</td></tr><tr><td style="height: 29.8px;">100uF 10v

</td><td style="height: 29.8px;">C24</td></tr><tr><td style="height: 29.8px;">2200uF 25v

</td><td style="height: 29.8px;">C20</td></tr></tbody></table>

</td></tr></tbody></table>