So I just bought a '08 690 SMC from it's second owner who's getting a superenduro for a trip to Chillie. Original speedo that had fogging, flickering display and dead elements in the tens of minutes clock display - so of course i took it apart.
white dust everywhere
it was pretty obvious what was causing it. The tabs that hold the clear backlighting diffuser to the white plastic spacer were all broken. the bottom of the clear piece is almost file-like with a billion little piramids and there were clearly worn areas at the edges of the spacer from the vibration
there were two pins for the LCD display that had cracked and I believe the flickering is due to fretting of the pins in their sockets due to vibration
sooo... after a compleat cleaning I bonded the clear piece to the white piece with clear silicon around the edges
cut an access to the broken pins in the clear piece and lightly siliconed the LCD down to the clear piece
I brushed a small amount of silicone dielectric lube on the LCD terminals before plugging the bonded assembly back into the circuit board with the two pin pieces already in their sockets. with the LCD secured against vibration this should help prevent poor contact at the terminals due to the fretting corrosion.
a quick solder joint across the cracked pins
then I modified the breather holes in the clear cover with a pair of windshield washer 90' elbows - i didn't like the holes as they were, I didn't want to just plug them even though the manufacturer went to the trouble of putting a gore-tex sealed breather in the bottom case half.
re-assembled with a light skim of clear silicone on the case to cover gasket
sorry no after pics but it does work fine, only flaw is that there had been so much dust in the lower right for so long it wore imperfections in a small area of the speedo overlay - not a problem for me
c'mon china, lrn2speedo
back to lurking now
white dust everywhere
it was pretty obvious what was causing it. The tabs that hold the clear backlighting diffuser to the white plastic spacer were all broken. the bottom of the clear piece is almost file-like with a billion little piramids and there were clearly worn areas at the edges of the spacer from the vibration
there were two pins for the LCD display that had cracked and I believe the flickering is due to fretting of the pins in their sockets due to vibration
sooo... after a compleat cleaning I bonded the clear piece to the white piece with clear silicon around the edges
cut an access to the broken pins in the clear piece and lightly siliconed the LCD down to the clear piece
I brushed a small amount of silicone dielectric lube on the LCD terminals before plugging the bonded assembly back into the circuit board with the two pin pieces already in their sockets. with the LCD secured against vibration this should help prevent poor contact at the terminals due to the fretting corrosion.
a quick solder joint across the cracked pins
then I modified the breather holes in the clear cover with a pair of windshield washer 90' elbows - i didn't like the holes as they were, I didn't want to just plug them even though the manufacturer went to the trouble of putting a gore-tex sealed breather in the bottom case half.
re-assembled with a light skim of clear silicone on the case to cover gasket
sorry no after pics but it does work fine, only flaw is that there had been so much dust in the lower right for so long it wore imperfections in a small area of the speedo overlay - not a problem for me
c'mon china, lrn2speedo
back to lurking now