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Miss Di
 Post subject: ROM Chip
PostPosted: July 22nd, 2015, 7:57 
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Joined: September 5th, 2014, 9:14
Posts: 72
Location: France
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Hello,

I have a ST3320820A with PCB burnt. On the PCB there are 3 8-legged chips but just one of them start with 25xxxxx. I replaced this one but the disk still not working.

Does anyone know if one of the other 2 chips belongs to the ROM as well.

Picture of PCB below:


Thanks.
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pcimage
 Post subject: Re: ROM Chip
PostPosted: July 22nd, 2015, 9:47 
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Joined: November 29th, 2006, 10:08
Posts: 7865
Location: UK
"ROM" chip is the top one.

How do you mean "still not working" ?

Still dead?

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Miss Di
 Post subject: Re: ROM Chip
PostPosted: July 22nd, 2015, 9:52 
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Joined: September 5th, 2014, 9:14
Posts: 72
Location: France
Hello,

Still not working means strange clicking noises. Heads are OK.
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pcimage
 Post subject: Re: ROM Chip
PostPosted: July 22nd, 2015, 12:21 
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Joined: November 29th, 2006, 10:08
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Location: UK
Miss Di wrote:
Hello,

Still not working means strange clicking noises. Heads are OK.


How do you know heads are OK?

You've changed the heads assembly, which includes preamp?

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data-medics
 Post subject: Re: ROM Chip
PostPosted: July 22nd, 2015, 15:04 
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Joined: April 3rd, 2011, 0:19
Posts: 2003
Location: Providence, RI
Miss Di wrote:
Hello,

Still not working means strange clicking noises. Heads are OK.


I just love posts like this. :lol:

It's like saying: "My hard drive is not working, but there's nothing wrong with it"

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Miss Di
 Post subject: Re: ROM Chip
PostPosted: July 28th, 2015, 9:05 
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Joined: September 5th, 2014, 9:14
Posts: 72
Location: France
Thanks for all your suggestions.

Does anyone have a general guide to check PCB's? Like which components should be check and what expect from each one?

Thanks,
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fzabkar
 Post subject: Re: ROM Chip
PostPosted: July 28th, 2015, 16:10 
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Joined: September 8th, 2009, 18:21
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Location: Australia
What was burnt on the original PCB?

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