Lethal Enforcers EEPROM Q2

Triton2k3

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Hi,

First time posting here. I searched for a little while on this topic and am somewhat confused. I bought a Lethal Enforcers cabinet recently for $15. Originally when starting it up it smoked a little. I blew it out a little with my compressor and the monitor started up the next time I started. Everything comes up ok, but I am getting a EEPROM Q2 error after holding the test button. I read somewhere that holding the test button might clear the error but it has not. I also read that the EEPROM is a chip that I can remove and change or clean if needed. Knowing that I searched to find the chip and from what I am seeing it is a soldered on chip, is that correct? Is there anyone that can direct me to the correct chip that needs to be replaced? Is there a better way to go about this?

Does anyone know of a place that repairs these boards? The machine is spotless. I had originally bought it for the cabinet, but I'd like to keep it all original if I can. I am assuming the sound works as it makes a loud noise at startup.

I have also been looking for resources to explain these machines better. Does anyone have a good place to start?

Thank you in advance.
 
Adding a few pictures.
 

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The serial EEPROM is the ER5911 (8 pin) in front of JAMMA edge connector.Check with a logic probe if its data bit output (pin 4) is stuck on boot.You could also replace it straight.
 
Perfect. Appreciate your help. Working in getting the chip now. good machine to practice on.
 
I replaced the er5911 today. Flipped the switch and I'm getting the same error when holding test down. Any ideas what could have been missed?
 
Check the chip has +5V and GND on the right pins - this is a multi-layer printed pcb (gnd and +5 layer under the top layer of traces you see) so sometimes replacing chips can have problems.

If that's good you really need a logic probe to see if the output pin pulses at any point during the boot-up. If it doesn't and the chip is good then the CPU is probably not able to activate it (the problem is the upstream chip). If it does then the problem is the downstream chip.
 
Thanks. I bought a working board to replace this one. I'm going to look into everything you mentioned though. Seems like a good board to learn on now that I have a good replacement in the mail. I'll let you know where this goes once I get a chance to test. Appreciate your help.
 
From attached snippet of schematics it seems the ER5911 serial EEPROM is receiving signals from a 74LS273 and outputs his bit to a 74LS253.I'd check both, from my experience I suspect more the latter (which fails often on Konami boards causing bad inputs).
 

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