(5)
.
How to replace the IC card
Remove the IC, Clamp the IC both ends
with tweezers so that each pin is aligned
with the corresponding pin position on the
pad.Note the IC direction.
After module lights up and the display effect
is normal, assemble the module back into
the cabinet. Use single component RTV
silicone rubber (black) to patch in the
rubber where it has been scraped off and
around the lamp board of the module which
copper sheet is off.
Accurately corresponds and appress to the
IC pad.
(
Note that the pin at the concave dot
in the upper left corner of the IC front side is
the first pin and must be welded
corresponding to the small circle of the
circuit board IC silkscreen
).
Clean the conformal and tin freezing point
on the pad surface.
Use soldering iron to drag the pins on both
sides of the heating IC back and forth. Fuse
the tin on the pad with the pin and fix it onto
the pad.
Tilt the lamp board to 45 degreesHeat the
tin on the IC pin with a soldering iron, drag
it from up to down and gently shake off any
excess tin sticking to the soldering iron.Until
all the IC pins are not connected.
Heat the IC with a air pressure gun(390
℃
)
until the pin tin surface melts, then use
tweezers to pick up the IC.
Clean the conformal coating
on the pad surface
Use air pressure gun to
heat the bad IC
Remove the bad IC
Clean the tin freezing point
on the pad surface
Align the IC with the
direction and the pad
Add tin to fix IC pin
Clean up excess tin from
IC pins
S
hould not have connected
IC
Opertion schematic diagram
?
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