I received a battery leaked A4000D motherboard for repair and restoration. This time a bit more rare rev 2 motherboard. The previous owner had replaced the leaked barrel battery and done some repairs. The SIMM sockets had been replaced with vertical sockets and surface mount capacitors with through-hole parts. The board did not boot when it arrived here.
Several traces and pads around the battery area were repaired with jumper wires by the previous owner. Some fixes were quite subtle, some not so much. Three traces below the C192 capacitor were in a rough shape. And so were the three vias next to the outermost SIMM socket. The vias were fixed with jumper wires but the fix didn't work anymore as the traces were corroded too much to conduct. A few traces of the outermost SIMM sockets were repaired with jumper wires.
Some fixed were also done for the audio circuit. All surface mount capacitors had been replaced with through-hole parts. Some of the capacitor pads were loose and one was missing. The missing pad was fixed with a blue jumper wire.
The repair begun by removing all the SIMM sockets and surface mount components around the battery area. The traces under the SIMM sockets were in quite a bad shape. Well over 20 traces had begun to corrode, some of them were broken and some soon to be. Also quite a few pads, traces and vias near the battery area were either missing or corroded. Notice the amount of battery acid under the J975 connector :mrgreen:
The traces of the SIMM sockets were cleaned and then repaired with jumper wires. Also the three vias and traces on the left-hand side of U850 were fixed with longer jumper wires. Also the missing pads and traces around the battery area needed quite a few jumper wires (and hours). Jumper wires were okay for the missing pads but maybe for the next repair I'll make proper pads of copper sheet.
The through-hole capacitors were a bit annoying to replace as all of them were glued to the motherboard with epoxy. :?
The audio area was cleaned of capacitor leak. The through-hole capacitors were replaced with surface mount parts. Through-holes get the job done but I prefer to keep the original look of the board. The blue jumper wire was replaced with a thin wire that goes under the 1k resistor next to the C433 capacitor. The wire won't be noticed without a magnifying lens
There were also some other issues with the board such as broken ICs and traces but after taking care of them, the board was fully working again.
Till next time.
Several traces and pads around the battery area were repaired with jumper wires by the previous owner. Some fixes were quite subtle, some not so much. Three traces below the C192 capacitor were in a rough shape. And so were the three vias next to the outermost SIMM socket. The vias were fixed with jumper wires but the fix didn't work anymore as the traces were corroded too much to conduct. A few traces of the outermost SIMM sockets were repaired with jumper wires.
Some fixed were also done for the audio circuit. All surface mount capacitors had been replaced with through-hole parts. Some of the capacitor pads were loose and one was missing. The missing pad was fixed with a blue jumper wire.
The repair begun by removing all the SIMM sockets and surface mount components around the battery area. The traces under the SIMM sockets were in quite a bad shape. Well over 20 traces had begun to corrode, some of them were broken and some soon to be. Also quite a few pads, traces and vias near the battery area were either missing or corroded. Notice the amount of battery acid under the J975 connector :mrgreen:
The traces of the SIMM sockets were cleaned and then repaired with jumper wires. Also the three vias and traces on the left-hand side of U850 were fixed with longer jumper wires. Also the missing pads and traces around the battery area needed quite a few jumper wires (and hours). Jumper wires were okay for the missing pads but maybe for the next repair I'll make proper pads of copper sheet.
The through-hole capacitors were a bit annoying to replace as all of them were glued to the motherboard with epoxy. :?
The audio area was cleaned of capacitor leak. The through-hole capacitors were replaced with surface mount parts. Through-holes get the job done but I prefer to keep the original look of the board. The blue jumper wire was replaced with a thin wire that goes under the 1k resistor next to the C433 capacitor. The wire won't be noticed without a magnifying lens
There were also some other issues with the board such as broken ICs and traces but after taking care of them, the board was fully working again.
Till next time.
Last edited: