Haier TV-8888-09, Service Manual

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8
“Small-Signal” Discrete transistor
Removal/Replacement
• Remove the defective transistor by clipping its leads as close as possible to
the component body.
• Bend into a “U” shape the end of each of three leads remaining on the circuit
board.
• Bend into a “U” shape the replacement transistor leads.
• 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
• Heat and remove all solder from around the transistor leads.
• Remove the heat sink mounting screw (if so equipped).
• Carefully remove the transistor from the heat sink of the circuit board.
• Insert new transistor in the circuit board.
• Solder each transistor lead, and clip off excess lead.
• Replace heat sink.
Diode Removal/Replacement
Remove defective diode by clipping its leads as close as possible to diode body.
Bend the two remaining leads perpendicularly to the circuit board.
Observing diode polarity, wrap each lead of the new diode round the corresponding
lead on the circuit board.
Securely crimp each connection and solder it.
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 the top of the circuit board hollow stake.
2. Securely clamp the leads of replacement component around the 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.