Only Video No Sound on TV via HDMI

I have two relative new notebooks, HP15-R063NR and HP15-f039wm. Both are Windows 8.1
I tried the two notebooks using the same HDMI cable and the same TV. The HP15-R063NR works normally, but the HP15-f039wm has no sound on the TV (only video no audio).
I checked the Sound playback when connecting to TV via HDMI. The HP15-R063NR has the icon of 247HD-T11 Intel® Display Audio, but the HP15-f039wm doesn’t have the icon.
I checked C:\windows\system32\drivers. Both laptops have the same drivers: drmk.sys, IntcDAud.sys, Ksthunk.sys and Protcls.sys with the same dates installed
3.I checked both laptops for Troubleshooting – Hardware & Sound-Troubleshoot Audio Playback-Playing Audio, both laptops were “Troubleshooting couldn’t identify the problem”.
Question:  Two HP laptops with the same drivers, using the same HDMI cable and the same TV, no problem through Troubleshooting. Why one has good audio the other doesn’t . How to fix it?

Hi @31danny 
I understand that one of your notebooks is not playing sound using HDMI, using all the same hardware. Also that you have performed some of the standard checks. I am happy to assist with this.
As to why the one is working and the other is not, is impossible to say yet. Like any complex device, there are small variations between the components, and in some cases that can result in differences between how one performs versus the other. So no two pieces of hardware will be exactly the same.
Anyway, I would recommend you check through this page and since you have already done many of the things within, I would look to the options further down, and start with the hard reset:
Troubleshooting HDMI Display and Sound Issues
Let me know if those steps help at all, and if not, any other information you can provide.
Malygris1
I work on behalf of HP
Please click Accept as Solution if you feel my post solved your issue, it will help others find the solution.
Click Kudos Thumbs Up on the right to say “Thanks” for helping!

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