diff --git a/src/BizHawk.Emulation.Cores/Consoles/Fairchild/ChannelF/ChannelF.ISettable.cs b/src/BizHawk.Emulation.Cores/Consoles/Fairchild/ChannelF/ChannelF.ISettable.cs
index 1a7d2daa5c..603461dacc 100644
--- a/src/BizHawk.Emulation.Cores/Consoles/Fairchild/ChannelF/ChannelF.ISettable.cs
+++ b/src/BizHawk.Emulation.Cores/Consoles/Fairchild/ChannelF/ChannelF.ISettable.cs
@@ -65,7 +65,7 @@ namespace BizHawk.Emulation.Cores.Consoles.ChannelF
 
 			[DisplayName("Viewport")]
 			[Description("Visable screen area (cropping options)")]
-			[DefaultValue(ViewPort.Trimmed)]
+			[DefaultValue(ViewPort.AllVisible)]
 			public ViewPort Viewport { get; set; }
 
 			public ChannelFSyncSettings Clone()
diff --git a/src/BizHawk.Emulation.Cores/Consoles/Fairchild/ChannelF/ChannelF.IVideoProvider.cs b/src/BizHawk.Emulation.Cores/Consoles/Fairchild/ChannelF/ChannelF.IVideoProvider.cs
index b097bf267d..ff4b35a00f 100644
--- a/src/BizHawk.Emulation.Cores/Consoles/Fairchild/ChannelF/ChannelF.IVideoProvider.cs
+++ b/src/BizHawk.Emulation.Cores/Consoles/Fairchild/ChannelF/ChannelF.IVideoProvider.cs
@@ -74,10 +74,10 @@ namespace BizHawk.Emulation.Cores.Consoles.ChannelF
 
 				case ViewPort.Trimmed:
 					// https://channelf.se/veswiki/index.php?title=VRAM
-					TrimLeft = 0;
-					TrimRight = HBlankOn - HBlankOff - (95 * PixelWidth);
-					TrimTop = 0;
-					TrimBottom = 0;
+					TrimLeft = 5;
+					TrimRight = 5;
+					TrimTop = 5;
+					TrimBottom = 5;
 					break;
 			}
 		}