Pharaoh
Williams, 1981You're currently viewing posts by Pinsider barakandl.
Click here to go back to viewing the entire thread.
You have sent 12v down strobe #10 by doing that. The 74154 at IC6 on the MPU is probably fried. The 74 series chips do not like over voltage. Nothing else likely be bad on the MPU/Driver. If that 74154 is in a chip socket it would be pretty noninvasive to try a new one. If the board is in warranty see what the manufacturer says.
Master display board is probably ok. 12v pin would have been floating and the others are just 5v or ground going to strobe inputs.
Quoted from cooked71:Chip is socketed so that’s good. Going to order a new one now and see what happens- fingers crossed.
The numbers on the chip are slightly different than g-p-e mentions. Does it matter as long as it’s not surface mount? [quoted image]
74154, 74LS154, 74HCT154 will all work. The 74HC154 will work if the decoder is wired up to CMOS ports of the PIA.... i am not sure from memory if it is.
I think they also make this chip in a narrow through hole package with 0.3" between rows which you don't want. Get through hole wide part 0.6" between rows.
You're currently viewing posts by Pinsider barakandl.
Click here to go back to viewing the entire thread.
Wanna join the discussion? Please sign in to reply to this topic.
Great to see you're enjoying Pinside! Did you know Pinside is able to run without any 3rd-party banners or ads, thanks to the support from our visitors? Please consider a donation to Pinside and get anext to your username to show for it! Or better yet, subscribe to Pinside+!
This page was printed from https://pinside.com/pinball/forum/topic/have-i-fried-my-rottendog-mpu327-amp-pharoah?tu=barakandl and we tried optimising it for printing. Some page elements may have been deliberately hidden.
Scan the QR code on the left to jump to the URL this document was printed from.
South Kingstown, RI