Hello. If there are people who are still experiencing the issue, here's my fix.
I had a similar issue: the buttons "4, 5, r, t, f, g, v and b" refused to be used on an ASUS F550J laptop.
CAUTION: In order to not break your computer, ask a friend who has skills in the hardware area or ask for technical support.
EXPLANATION to the fix: The main problem is that the cable, which transfers data from keys to the processor, is touching a hot steel/iron/etc. This causes data loss and the keys permanently stay unusable or at least barely usable.
STEPS to fix:
1. Make sure you know what you're doing.
2. Turn off the laptop.
3. Turn the laptop upside-down.
4. Unscrew every bolt you find.
5. There might be a couple screws under the battery. If...