Updating Farm admin Credentials

If we changed farm admin password,,,,, if we try to open central admin or any site in the farm we will get 503 error.

at that time we need to apply changed password at

                     Application pool in IIS
                     SQL server password in services.msc
                     next in powershell we need to update for whole farm level

stsadm -o updatefarmcredentials -userlogin domain\userid -password newpassword