Repair & Schematics
PC Engine
Visual Diagnostics (PC Engine)
1min
Many common problems can be seen by having a specific type of screen output.
Below are some common errors that might be quicker identified by their visual appearance.
Initially looking as if there is an over-wash of red, or lack of blue/green (although blue and green do still both appear), this has been known to be caused by a bad Hu6270 (CPU), specifically the pin 32 (VD2) that was faulty and required a new CPU.
![Bad VD2 Bad VD2](https://images.archbee.com/9EnOacbhz7Zqgrsars4GT/3l4kPZcARLrJwl_z5bXD-_rgb-vd2-faulty.png?format=webp)
Bad VD2
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Notice how it looks compared to a working CPU below.
![Working CPU Working CPU](https://images.archbee.com/9EnOacbhz7Zqgrsars4GT/V5dVCWmttFU4Eoqv8PqU3_rgb-working.png?format=webp)
Working CPU
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Updated 10 Sep 2023
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