sys 4 flash boot help needed

[studley67]

 $.$my e-bay crap flash wont boot at all.powers on now after changing line filter.had it boot to audits,once and had a game on it once.after doing the quick power on/off/on trick, hit a lane switch and died.changed battery holder,was delaminated,changed cmos 5101 ram.with anti-static strap to earth.

powered up with both leds stuck on.replaced 40 pin interconect pins/socket and all header pins for reliability.ordered new roms,socket all scanbee and mpu with machined pin sockets.

this has been a project over a couple of months now.and the order of thing i have done to it may not be correct.tried new 6800 cpu,tried another cmos 5101,tried new roms from j wart.about to give up and buy a rottendog board replacement...

any help or advice would be much appreciated,damien

ps i can`t find that leon test rom i bought

[Strangeways]

You have ordered, but not replaced the ROM sockets - is that correct ?

I'd be replacing those ROM sockets. If you have, then retrace all your steps - it may be something simple.

[studley67]

all rom sockets have been replaced with machined pin sokets.the new roms have been installed also

[goodolddays]

One idea is you could send it to Ken (Skybeau) .. he does a great job at a good price .. 

[Strangeways]

Do you have the correct voltages out of the power supply ?

[studley67]

. ^&^re-ordered roms,but do i have to change any jumpers etc on the sys 4 board to accept the new roms,ic 14 socket has been installed do i need to do anything else,please help

[FirePower]

It's a bit hard to follow exactly what's going on here, but ....

A sys4 board for Flash would expect to see flipper roms at IC20 and IC 17 and a game rom at IC14 -this is standard for this game.  Sys4 would have had yellow flipper roms and the game rom must match as a yellow game rom.   You can also use green flipper roms in a sys4 board - no jumper changes required - provided that the game rom is also the corresponding green version.  The yellow and green game rom version are different, but both can be used in a sys4 board provided they are used as a set of flipper and game.

I'm not sure you are on the correct path with just replacing roms. You need a systematic approach. Begin by verifying psu volatges, as Nino suggested, on the mpu bard, then find your Leon test rom and work through the tests on that.  This lets you test mpu split from driver - which makes the problem easier.

I'd also look hard at the reset and blanking sections, but in a systematic way!

   

[studley67]

thankyou firepower,i shall persavere,and fix it when new leon arrivves or i remember that safe place i put it,lol