LG RF-20CC20M, Service Manual

- 5 -

c. Qulckly move the soldering iron tip to the junction of the

component lead and the printed circuit foil, and hold it
there only until the solder flows onto and around both the
component lead and the foil.

CAUTION: 

Work quickly to avoid overheating the circuit

board printed foil.

d. Closely inspect the solder area and remove any excess

or splashed solder with a small wire-bristle brush.

IC Remove/Replacement

Some chassis circuit boards have slotted holes (oblong) through
which the IC leads are inserted and then bent flat against the
circuit foil. When holes are the slotted type, the following
technique should be used to remove and replace the IC. When
working with boards using the familiar round hole, use the
standard technique as outlined in parapraphs 5 and 6 above.

Removal

1.  Desolder and straighten each IC lead in one operation by

gently prying up on the lead with the soldering iron tip as the
solder melts.

2.  Draw away the melted solder with an anti-static suction-

type solder removal device (or with solder braid) before
removing the IC.

Replacement

1.  Carefully insert the replacement IC in the circuit boare.
2.  Carefully bend each IC lead against the circuit foil pad and

solder it.

3.  Clean the soldered areas with a small wire-bristle brush.

(It is not necessary to reapply acrylic coating to the areas).

"Small-Signal" Discrete Transistor
Removal/Replacement

1.  Remove the defective transistor by clipping its leads as

close as possible to the component body.

2.  Bend into a "U" shape the end of each of three leads

remaining on the circuit board.

3.  Bend into a "U" shape the replacement transistor leads.
4.  Connect the replacement transistor leads to the

corresponding leads extending from the circuit board and
crimp the "U" with long nose pliers to insure metal to metal
contact then solder each connection.

Power Output, Transistor Device
Removal/Replacement

1.  Heat and remove all solder from around the transistor leads.
2. Remove the heatsink mounting screw (if so equipped).
3.  Carefully remove the transistor from the heat sink of the

circuit board.

4.  Insert new transistor in the circuit board.
5. Solder each transistor lead, and clip off excess lead.
6.  Replace heatsink.

Diode Removal/Replacement

1.  Remove defective diode by clipping its leads as close as

possible to diode body.

2.  Bend the two remaining leads perpendicula y to the circuit

board.

3.  Observing diode polarity, wrap each lead of the new diode

around the corresponding lead on the circuit board.

4.  Securely crimp each connection and solder it.
5. Inspect (on the circuit board copper side) the solder joints of

the two "original" leads. If they are not shiny, reheat them
and if necessary, apply additional solder.

Fuse and Conventional Resistor
Removal/Replacement

1.  Clip each fuse or resistor lead at top of the circuit board

hollow stake.

2.  Securely crimp the leads of replacement component around

notch at stake top.

3.  Solder the connections.

CAUTION: 

Maintain original spacing between the replaced

component and adjacent components and the circuit board
to prevent excessive component temperatures.

Circuit Board Foil Repair

Excessive heat applied to the copper foil of any printed circuit
board will weaken the adhesive that bonds the foil to the circuit
board causing the foil to separate from or "lift-off" the board.
The following guidelines and procedures should be followed
whenever this condition is encountered.

At IC Connections

To repair a defective copper pattern at IC connections use the
following procedure to install a jumper wire on the copper
pattern side of the circuit board. (Use this technique only on IC
connections).

1.  Carefully remove the damaged copper pattern with a sharp

knife. (Remove only as much copper as absolutely
necessary).

2.  carefully scratch away the solder resist and acrylic coating

(if used) from the end of the remaining copper pattern.

3.  Bend a small "U" in one end of a small gauge jumper wire and

carefully crimp it around the IC pin. Solder the IC connection.

4.  Route the jumper wire along the path of the out-away

copper pattern and let it overlap the previously scraped end
of the good copper pattern. Solder the overlapped area and
clip off any excess jumper wire.

At Other Connections

Use the following technique to repair the defective copper
pattern at connections other than IC Pins. This technique
involoves the installation of a jumper wire on the component
side of the circuit board.

1.  Remove the defective copper pattern with a sharp knife.

Remove at least 1/4 inch of copper, to ensure that a
hazardous condition will not exist if the jumper wire opens.

2.  Trace along the copper pattern from both sides of the

pattern break and locate the nearest component that is
directly connected to the affected copper pattern.

3.  Connect insulated 20-gauge jumper wire from the lead of

the nearest component on one side of the pattern break to
the lead of the nearest component on the other side.
Carefully crimp and solder the connections.

CAUTION: 

Be sure the insulated jumper wire is dressed so

the it does not touch components or sharp edges.