MS is dead after cleaning with acetone
#1
Junior Member
Thread Starter
iTrader: (4)
Join Date: Oct 2007
Location: santa cruz
Posts: 245
Total Cats: 1
MS is dead after cleaning with acetone
I built a MSI V3.0 and passed all tests up to and including step 55.
Controlled Megatune gages with Stim pots.
Finished building board to the end.
Washed board with acetone and re-inspected all joints. Everything was spick and span.
Woke up this morning and hooked MS to DB9 cable and Stim and I get nothing. Fresh battery. Nothing. Double checked my cable, jumped pins 2&3 and got echo. Plugged cable back into MS, jumped U1 pins 12 & 13, no echo. If I jump DB9 pins 2 & 3 on the board, I get appropriate echo so I know DB9 cable is connected to MS.
Stuck at test in step 26.g.
Pin 4 of processor shows 32.76hz
Testing on the MAX232 shows
Pin 16 is 4.95
Pin 15 = 0.6 Ω to the middle pin of U5
Pin 11 to CPU Pin12 = ~0.3 Ω
Pin 12 to CPU pin 13 ~0.3 Ω
Power supply testing on U1 pins all succesful.
I have 5 volts between pins 19 (ground) and 20 (+5), there is also +5 on pin 1 and 31 (checked against ground at pin 19), and there is ground potential on pins 2 and 32 (checked against +5V on pin 20). The processor has power on the 40-pin socket but none of the LEDs on the MS respond. Capacitors with polarity and all diodes were triple checked for correct orientation and all checks out.
As I stated before, everything passed testing up to and including step 55. Then I brushed off the flux with acetone, gently blew it off with compressed air and waited approx. 12 hours. Hooked back up and now I don’t get response.
I’ve spent several hours searching and troubleshooting and I’d greatly appreciate any assistance.
Thanks
Controlled Megatune gages with Stim pots.
Finished building board to the end.
Washed board with acetone and re-inspected all joints. Everything was spick and span.
Woke up this morning and hooked MS to DB9 cable and Stim and I get nothing. Fresh battery. Nothing. Double checked my cable, jumped pins 2&3 and got echo. Plugged cable back into MS, jumped U1 pins 12 & 13, no echo. If I jump DB9 pins 2 & 3 on the board, I get appropriate echo so I know DB9 cable is connected to MS.
Stuck at test in step 26.g.
Pin 4 of processor shows 32.76hz
Testing on the MAX232 shows
Pin 16 is 4.95
Pin 15 = 0.6 Ω to the middle pin of U5
Pin 11 to CPU Pin12 = ~0.3 Ω
Pin 12 to CPU pin 13 ~0.3 Ω
Power supply testing on U1 pins all succesful.
I have 5 volts between pins 19 (ground) and 20 (+5), there is also +5 on pin 1 and 31 (checked against ground at pin 19), and there is ground potential on pins 2 and 32 (checked against +5V on pin 20). The processor has power on the 40-pin socket but none of the LEDs on the MS respond. Capacitors with polarity and all diodes were triple checked for correct orientation and all checks out.
As I stated before, everything passed testing up to and including step 55. Then I brushed off the flux with acetone, gently blew it off with compressed air and waited approx. 12 hours. Hooked back up and now I don’t get response.
I’ve spent several hours searching and troubleshooting and I’d greatly appreciate any assistance.
Thanks
Thread
Thread Starter
Forum
Replies
Last Post
bigmackloud
Miata parts for sale/trade
19
01-08-2021 11:24 AM
StratoBlue1109
Miata parts for sale/trade
21
09-30-2018 01:09 PM