---
title: Replace Sega Genesis Model 2 Power Supply Capacitors
siteUrl: https://logzly.com/pixeltimecapsule
author: pixeltimecapsule (Pixel Time Capsule)
date: 2026-07-14T17:01:14.704381
tags: [retrogaming, sega_genesis, electronicsrepair]
url: https://logzly.com/pixeltimecapsule/replace-sega-genesis-model-2-power-supply-capacitors
---


Your Sega Genesis Model 2 won’t power on? In the next few minutes you’ll learn **exactly how to replace the power supply capacitors** and get that classic startup chime ringing again. Follow this step‑by‑step guide, test the voltage, and have your console gaming‑ready in under an hour.

## Why the Power Supply Fails

The Model 2’s external brick uses electrolytic caps that age quickly. Over time the **caps bulge, leak, or dry out**, causing the output voltage to drop from the required 9‑10 V to a useless 8 V or lower. The symptoms are unmistakable: dead power button, intermittent resets, or a completely dark screen.

## How to Test the Sega Genesis Model 2 Power Supply

1. **Unplug the brick** and safely discharge the caps with a screwdriver‑short across the leads.  
2. Set a multimeter to DC volts, place the probes on the **input pins** – you should see the mains voltage (≈120 V or 230 V).  
3. Move the probes to the **output pins**. If the reading is **below 9 V**, the caps are the likely culprit.

## How to Replace Sega Genesis Model 2 Power Supply Capacitors

### Gather the parts
- **470 µF 25 V** caps for the main filter  
- **100 µF 16 V** caps for secondary circuits  
- Soldering iron (≈350 °F), desoldering pump, isopropyl alcohol, and a cotton swab  

### Remove the old caps
1. Take a **photo of the board** for reference.  
2. Heat the iron, apply it to each lead, and use the pump to pull the old caps free.  
3. Clean the pads with alcohol to eliminate residue.

### Install the new caps
1. Align each **new capacitor’s polarity** – the negative stripe must match the silver “‑” marking on the board.  
2. Tin each pad with a tiny amount of fresh solder, then place the lead and re‑flow the solder until you get a **shiny, concave joint**.  
3. Repeat for all caps, keeping the iron away from nearby components to avoid heat damage.

## Final Checks & Power Up

1. Visually inspect for stray solder bridges or mis‑aligned caps.  
2. Re‑assemble the brick and plug it in.  
3. Measure the output again – you should see a steady **9.5 V** (or close) on the multimeter.  

When the red LED stays solid and the console boots, you’ve successfully **fixed the Sega Genesis Model 2 no‑power issue**. If you’re new to soldering, practice on a spare board first and always work in a well‑ventilated area.