NOW FIXED Lindbergh Yellow low sound level

PCB problems and fixes
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Brettster
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NOW FIXED Lindbergh Yellow low sound level

Post by Brettster » April 2nd, 2016, 9:44 am

I've just picked up a Lindbergh Yellow with VF5 its running ok but the sound is very low, I need to turn up my vewlix amp almost to full to hear anything
I have the lead to the amp connected to the white and red RCA connectors on the sound card. is there some internal sound levels that can be altered? dip settings etc?

* Here's how I Fixed it*

I swapped the op amps over (3 x 8 pin surface mount JRC 4556 A519 IC's), IC5 to IC7
these could be replaced but I didn't have any spare new ones and its unlikely I'll be using this in surround sound mode so I swapped the two tiny chips over as per the arrows in the pic
Lindy Sound Fix1.jpg
They are very small and fiddly so dont try this if its your first time soldering :awe:
Lindy Sound Fix2.jpg
Last edited by Brettster on April 24th, 2016, 9:03 am, edited 3 times in total.
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Brettster
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Re: Lindbergh Yellow low sound level

Post by Brettster » April 2nd, 2016, 5:54 pm

Is there a PC sound card equivalent that works ok in the Lindy? looks like a basic PC creative labs card!!
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grantspain
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Re: Lindbergh Yellow low sound level

Post by grantspain » April 2nd, 2016, 6:46 pm

i imagine you have adjusted the volume in test

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Brettster
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Re: Lindbergh Yellow low sound level

Post by Brettster » April 2nd, 2016, 9:05 pm

grantspain wrote:i imagine you have adjusted the volume in test
It would make sense that would be the issue but I cannot see any sound levels in test mode
There is a sound test option for the 5 channels but not volume level
Other than the output being very quiet it's working perfectly
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tinchen3112
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Re: Lindbergh Yellow low sound level

Post by tinchen3112 » April 2nd, 2016, 10:05 pm

As far as i know this is a custom Soundcard which creative build for sega.
i´ve tried already half of a dozen other common creative soundcards, even the Audigy 4 which has the same soundchip like the lindy one, but sadly no one of these work.

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Re: Lindbergh Yellow low sound level

Post by Brettster » April 2nd, 2016, 10:44 pm

Thanks Frank
I have an audigy 2 in the loft and I was going to venture up there to give it a test, but you saved me the trouble now :lol:
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Re: Lindbergh Yellow low sound level

Post by purplec » April 3rd, 2016, 12:29 pm

Andy is selling these soundcards for a reasonable enough price

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leonardoliveira
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Re: Lindbergh Yellow low sound level

Post by leonardoliveira » April 3rd, 2016, 5:34 pm

tinchen3112 wrote:As far as i know this is a custom Soundcard which creative build for sega.
i´ve tried already half of a dozen other common creative soundcards, even the Audigy 4 which has the same soundchip like the lindy one, but sadly no one of these work.
VID(Vendor ID)/PID(Product ID) must be different (EEPROM)... Or at least the PID surely is different. So no brainer a standard retail card will never work there.
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andygeezer
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Re: Lindbergh Yellow low sound level

Post by andygeezer » April 4th, 2016, 12:52 pm

leonardoliveira wrote:
tinchen3112 wrote:As far as i know this is a custom Soundcard which creative build for sega.
i´ve tried already half of a dozen other common creative soundcards, even the Audigy 4 which has the same soundchip like the lindy one, but sadly no one of these work.
VID(Vendor ID)/PID(Product ID) must be different (EEPROM)... Or at least the PID surely is different. So no brainer a standard retail card will never work there.

Actually the monta vista kernel supports most EAX PCI Creative sound cards, but Sega are using a custom EEprom firmware, if you take the Audigy 4 value, and reflash the eeprom with the Sega one, it works.
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Brettster
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Re: Lindbergh Yellow low sound level

Post by Brettster » April 4th, 2016, 6:55 pm

What's involved with flashing the eeprom on the audigy 4 card? Command line from Windows or desoldering the chip?
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Re: Lindbergh Yellow low sound level

Post by andygeezer » April 5th, 2016, 6:42 am

Brettster wrote:What's involved with flashing the eeprom on the audigy 4 card? Command line from Windows or desoldering the chip?
Removing and flashing
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tinchen3112
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Re: Lindbergh Yellow low sound level

Post by tinchen3112 » April 5th, 2016, 6:10 pm

@ Andy
thx for the Tip!

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Re: Lindbergh Yellow low sound level

Post by leonardoliveira » April 6th, 2016, 2:14 am

Basically, the driver binary used on the SEGA stuff here is programmed to require a very specific PID/VID since it's part of the protection. There's no firmware on the EEPROM, just the information the driver uses to know the capabilities of the card.

Basically it tells the sound card driver the card model so the driver knows what physical connectors the card have installed and will adjust it's behavior based on it.
Similar to how nvidia video cards present themselves to the driver with different sub model IDs which locks or unlocks features on the video driver.

On this case, since it's a embedded system with a very specific use, the driver is programmed to run on a "all or nothing" basis... So, wrong PID/VID? No dice... :lol:
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Re: NOW FIXED Lindbergh Yellow low sound level

Post by Brettster » April 23rd, 2016, 11:28 pm

Just a quick update to this issue, I managed to fix my Sega Lindbergh sound card by swapping out the Op Amps
Basically there are 3 x 8 pin surface mount JRC 4556 A519 IC's
as I'll not be using the sound with a sub/centre speaker I swapped the one at the top with the one at the bottom
Now have lovely loud stereo sound :)
it's a fiddly job with only a soldering iron but as long as you have a steady hand and some basic skills you can do it

Just need to bake my graphics card now as that's showing odd artefacts, or random missing 3D graphics :(
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Re: NOW FIXED Lindbergh Yellow low sound level

Post by Pete » April 26th, 2016, 8:09 pm

Impressive fix :-o 8-)

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