If your service account is not in the services list (i.e. SPTraceV4), you will not be able to manage the service through the central administration user interface. As you should use SharePoint to perform this operation, you will have to use PowerShell. You can use the following script:
$servicename = "SPTraceV4"
$managedaccountname = "DOMAIN\sp_admin"
$farm = Get-SPFarm
$SPTimerv4 = $farm.Services | Where {$_.Name -eq $servicename}
$SPTimerV4NewAccount = Get-SPManagedAccount $managedaccountname
$SPTimerv4.ProcessIdentity.CurrentIdentityType = "SpecificUser"
$SPTimerv4.ProcessIdentity.ManagedAccount = $SPTimerv4NewAccount
$SPTimerv4.ProcessIdentity.Update()
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Didier Danse
Devoteam Luxembourg– Devoteam Group
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