diff --git a/autotests/testedid.cpp b/autotests/testedid.cpp
--- a/autotests/testedid.cpp
+++ b/autotests/testedid.cpp
@@ -121,7 +121,7 @@
         << QStringLiteral("SHP")
         << QStringList({QStringLiteral("SHP"), QStringLiteral("Sharp Corporation")})
         << QStringLiteral("")
-        << QStringLiteral("RXN49\uFFFDLQ133Z1")
+        << QStringLiteral("RXN49-LQ133Z1")
         << QStringLiteral("3627c3534e4c82871967b57237bf5b83")
         << 29U << 17U << 2.2
         << QQuaternion(1, QVector3D(0.639648, 0.328125, 0))
diff --git a/src/edid.cpp b/src/edid.cpp
--- a/src/edid.cpp
+++ b/src/edid.cpp
@@ -407,8 +407,12 @@
 {
         /* this is always 13 bytes, but we can't guarantee it's null
          * terminated or not junk. */
-        auto text = QString::fromLocal8Bit(reinterpret_cast<const char*>(data), 13);
+        auto text = QString::fromLatin1(reinterpret_cast<const char*>(data), 13).simplified();
 
-        // Remove newlines, extra spaces and stuff
-        return text.simplified();
+        for (int i = 0; i < text.length(); ++i) {
+            if (!text.at(i).isPrint()) {
+                text[i] = '-';
+            }
+        }
+        return text;
 }