Thread: Loud Noise at power up

Congrats on your first post.
OK to answer the questions, here goes.
1) The sound through the speakers probably has something to do with the inverter. Most people here are going to say ge a DC-DC pwr supply, and while Id agree, there are a few thing to check first. Try powering the pc in the vehicle from an extension cable from your house. I doubt the problem will occur using mains power. If the sound is still there, try a different supply also.

2) Are you using on-board sound? Or a PCI card?

3) Auto shutdown controlers basically shut your PC down in a nice way. They generally keep the PC running for 5-10 minutes after you turn off your ignition, and then start the shutdown process. This does 2 things. Firstly if you get out of your car for fuel or whatever you wont have to boot up the computer when you get back in. Its still running. Great if your in and out of the car alot. Secondly it lessens the damage to your HDD. By just cutting the power some people believe you can creat bad sectors and such. I wont get into this again.....................its another arguement waiting to happen.

Genesis,

Thanks for the reply.

I'm still confused about the startup noise as it used to happen with a different m/b and a DC-DC power supply on my first car mp3 system. I will try using an extension cord and power from the house, but the more I think about it, I remember hearing it on my in house (test) setup.

Also, I'm using on board sound with a sound blaster enabled BIOS setting..... any other ideas on why it is beeping?????

thanks

Dave

Magnetik,

Hey thanks for the help, I will try a sound blaster -- however, the startup noise is a loud pop that lasts for a split second as soon as I turn on the computer. Do you still think that it is hard drive or other noise? Thanks again


Dave

I get the same thing. as well as a POP on shutdown.
I think it's the surge to the system at initial startup as all the components get powered up w/ +3.3v,+5v,+12v,-5v,-12v just the +5vsb(stand by) should be on, and depending on how the analog section of the soundcard is designed (class A, AB, ...) the circuit will bounce as it finds a stable voltage for a 0Vac output (silence) this is the !PP! that is heard.

Try delaying the start so the inverter PS and amps are afew seconds after each other and power down in the reverse order.

hey buddy .. why dont you just Mute your headunit till the player boots up .. works for me or listen to the FM radio till the system boots up

Mastero