You are eligible to replace your Mykad if you face any of these problems:
1. Chip damage
2. Loss of card
3. Card damage
4. Replacement for the new updated chip
How to register?
Step 1: Register your account at https://www.malaysia.gov.my/portal/register to get started
source: goody25
Step 2: Fill in all the required details
Step 3: wait for a confirmation email then proceed to sign in. You will be asked to create a password.
Step 4: You will be directed to a website. Go to "registration" and click on "apply here".
Step 5: Read the terms and conditions carefully.
Step 6: Fill in all the required details.
Step 7: Proceed to payment (only credit card payment is accepted).
Step 8: Once application is accepted, print payment receipt and collect your card at the nearest JPN office.
If you need more details, you can check out the Online MyKad Replacement Guidelines here.