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Connection info for pin on LP1 on LC575 board

TonyJay

Well-known member
Long term storage of my LC575 - tested today and no longer boots. Ughh. Pulled board and while caps look ok (I plan to replace them all of course), I noticed that a component labelled LP1 (marked 'PECKO 0063' on mine, but on other boards I have seen online is 'Steward 430-2 155-0064'. I think it is a ferrite filter of some sort) near U12 (see image) had corrosion that was bad enough that the pad closest to the LP1 label is entirely gone. I removed the component , cleaned the 5 pads which looked good and put it back leaving the 1 pin unconnected. Using microscope I could not see even a hint of where the pad might have been connected to. No schematic so I have no idea where to connect a jumper wire. Image is from online but shows the connection that is missing. Any ideas where this should connect to? Much appreciated.
 

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TonyJay

Well-known member
I am new to this, but with an intact board, would it take long to check continuity of that pin to nearby components? I know that after I recap the board and it still does not work, I will be looking at that pin and wishing for help.
 

TonyJay

Well-known member
Does anyone have a schematic that I could try to trace where that broken pad connected to? Any help HUGELY appreciated. Thanks
 

AwkwardPotato

Well-known member
You're correct in it being an array of ferrites, LP1 is there to suppress EMI on the microphone input. You may want to try finding the Color Classic schematics instead, they ought to be available online, and the audio section is almost identical to that of the 575.

LP1 will not be the cause for the system's failure to boot. Thorough cleaning & recapping should be the first priority in getting this board working again; if it still doesn't boot afterwards, next thing to do is double- and triple- check that the area around the CUDA IC (behind ADB ports) is totally clean and free of rotten traces.
 

TonyJay

Well-known member
You're correct in it being an array of ferrites, LP1 is there to suppress EMI on the microphone input. You may want to try finding the Color Classic schematics instead, they ought to be available online, and the audio section is almost identical to that of the 575.

LP1 will not be the cause for the system's failure to boot. Thorough cleaning & recapping should be the first priority in getting this board working again; if it still doesn't boot afterwards, next thing to do is double- and triple- check that the area around the CUDA IC (behind ADB ports) is totally clean and free of rotten traces.
Thank you for reply and pointing me to a possible schematic. I am waiting for the replacement caps to arrive from Console 5 (I ordered other things so made sense on shipping), and will recap first. It may be that first pin is not essential.
 
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