3UVIEW TB2 Manual do utilizador - Página 14

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(5).How to replace the IC card

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 and tin freezing point

on the pad surface.

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.

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).

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 degrees Heat 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.

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.

Opertion schematic diagram

Use air pressure gun to

heat the bad IC

Clean the conformal coating

on the pad surface

Align the IC with the

direction and the pad

Clean up excess tin from

IC pins

Remove the bad IC

Clean the tin freezing point

on the pad surface

Add tin to fix IC pin

Should not have connected