Hi, My Mac Book Pro 15'' sound is unresponsive.

My macbook pro coincedently turned 2 years old today. However the sound is unresponsive. I am not able to tweak the sound higher or lower as the 'stop' symbol appears on the screen.
Since it is not under warranty any longer I will have to pay the price of repairing it.
The Authorised apple service center excecutive says it s a failed logic board that I need to replace (INR 34,000 rupees) .
Is there anything else I can do to repair the sound.
I have used external bluetooth speakers that connect fine but the quality of the sound is really really bad, unlike when I connect the same speakers to my smartphone where the sound is great.
Can this be repaired without replacing my logic board?
Please help

Hopefully one of these steps should solve the problem.
If not, contact AASP.
1. System Preference > Sound > Output > Internal Speakers
    Highlight Internal Speakers / Headphones
    Make sure that Mute is not enabled.
2. Remove the headphone.
    If you see red light in the headphone port, plug the headphone
    in and out of the port 5 or 6 times to flip the microswitch inside.
    Sound output may be stuck in the digital mode.
3. Reset PRAM. http://support.apple.com/kb/PH4405
4. Reset SMC.     http://support.apple.com/kb/HT3964
    Choose the method for:
    "Resetting SMC on portables with a battery you should not remove on your own".
5. Applications > Utilities > Audio MIDI Setup
    Audio Devices window
    Side Bar
    Click the Built-in Output.
    Under Mute any of the boxes checked? If so, uncheck it.
6. System Preferences > Sound> Sound Effects
    Play sound effects through:
   Select "Internal speakers" and then back to "Selected sound output device".

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1. System Preference > Sound > Output > Internal Speakers
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2. Remove the headphone.
    If you see red light in the headphone port, plug the headphone
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    Sound output may be stuck in the digital mode.
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Hi, My Mac Book Pro 15'' sound is unresponsive.

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