diff --git a/src/rgb_to_hdmi.c b/src/rgb_to_hdmi.c
index 720fddce..cf82955e 100644
--- a/src/rgb_to_hdmi.c
+++ b/src/rgb_to_hdmi.c
@@ -2350,6 +2350,9 @@ void rgb_to_hdmi_main() {
    log_info("Detected polarity state at startup = %s (%s)", sync_names[capinfo->detected_sync_type & SYNC_BIT_MASK], mixed_names[(capinfo->detected_sync_type & SYNC_BIT_MIXED_SYNC) ? 1 : 0]);
    // Determine initial mode
    mode7 = rgb_to_fb(capinfo, extra_flags() | BIT_PROBE) & BIT_MODE7 & (autoswitch == AUTOSWITCH_MODE7);
+   if (cpld_fail_state != CPLD_NORMAL) {
+       mode7 = 0;
+   }
    // Default to capturing indefinitely
    ncapture = -1;
    int keycount = key_press_reset();