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if you are happy to open the machine first , that would be best dont just pop the screws and start pulling it apart - watch some videos of others doing it - there are definate things NOT to do when opening there are many many videos of people doing all of the following dont use screw driver...

well i had 3 missing pads top left with vias just below them - i managed to solder wire from via to the pin , on all 3 but there were 6 pins that were not connected to their vias below the chip ( in the picture ) - they also did not connect to their corresponding chip above - so 2 breaks for...

well - tried to run jump wires , all over the place turned out to be impossible vias were too small - i did manage to solder wires into the vias but there were so many breaks in the traces i was just knocking off wires i already soldered while trying to add more jumpers you would need a...

oh man........ i give up on schematics ......... there are just simply things in life that some of us are not meant to understand - i have sat and watched tutorials on schematics , many times , and just gave up each time im slowly trying to map out the traces many breaks in traces from U5 to...

Thanks for that Phipli But if 9 is the actual pin number ( from DADDR[0] 9 A0 ) then what pin is "IO4 25 D(31)" or "VSS 26" - theres only 20 pins on these ram chips , there is no pin 25 or 26 so sorry for my cluelessness on these schematics

Got my car done , finally getting back to this poor LC I need some help folks - cant read schematics .... not a clue trying to understand them looking at U5 on this schematic i dont understand what " DADDR[0] 9 A0 " means - what bloody pin is this on the chip dont the pin counts start at 1 ...

If I were you I would be putting all my focus on saving the machine , before looking at upgrades Preserve what you have - a working machine with leaking caps , everywhere , that do nothing good clean the logic board , recap it , treat it for posssible deep electrolite within the layers of the...

ive no idea - but its a great idea - ............in rom , yes i guess........... wouldnt it be great if the desigeners included a jumper to bypass the onboard ram i wonder if there is a way to do it , to trick the rom .......... to not have to replace roms ........... some simple way to report...

i was looking at a small transformer off some board i have in a drawer - the wire thats wound onto that is very fine .... and the would be insulated as well - that would be a much easier way to go shircsh wont be going at it for a few days - have to change a blown head gasket on my car...

when i suspected cap goo breaking connections I started reflowing pins - this chip was the first i may have reflowed it twice ( maybe i missed one mentality ) allot of cap goo plus 2 bouts of heat did not fare out well saying that i have had to reflow pins/pads on other boards several times...

Thanks for all the tips folks I found the problem Earlier in this thread i said that if i pressed on onboard ram chip next to c128 , c127 at power up I was getting different chimes , from good chime , to chimes of death , to very slow chimes of death while searching for clues to this...

ive gone over this board , looking for anything wrong can anyone see a point of electrolite corrosion that could have broken something as i said , no battery leak - caps leaked - day i got it i inpected board for any obvious problems , then powered it up - it gave bad chimes .........that was...

i have ordered the macbatt - so in the mean time to test it i just soldered 2 x 1.5 batteries - gives 3.12 volts - thats good enough to test it , made no difference the fact that the machine is not booting from the floppy ( known good disk and drive ) tells me the machine is stuck / crashed if...

tried the vinegar bath ........ no change - let it soak for an hour why is this machine giving good startup chime , but no video .. zip ..... nada anyone know of the chips/ traces that could be at fault from the condition of the board ( very very good ) it has to be something close to the...

well , just tried it with a 3 volt battery and still no video good chime no video does not try boot from good floppy in a good floppy drive it appears to chime and then just freeze as i said before , i got this , battery removed , no sign of any acid damage , caps leaked but no bad signs of...

ive ordered up a few of those 'macbatt' things i had a 475 before and the quick on/off/on always worked for me as well who knows maybe its part of the startup sequence , that if the video is not initilized the start up freezes

also - i have tested the power , even swapped out the psu from my working lcIII , thats where i swapped the simms just to see they all come up good

thanks storm i have a 3 volt dc power adapter - u rekon it would be ok to wire that into the battery holder terminals just to see ? , just to test it i really dont want to blow this up !!!!

Hi all recently got me an LC475 battery did not leak caps did removed old caps and solder - scrubbed board - recapped with tants power on gives good chime but no video display have tried different vram pairs , tested on another machine have tried different ram sims , also known to...

hi eric thats not the problem im have - i power on , grey screen - no mouse pointer , nothing - no boot - cant get to a desktop - looks like machine is stuck somewhere during startup i have since got a working board , machine is working but when i get a chance i will use the good board to...