Touch Activated Lamp Transistor Replacement Repair Guide

Difficulty

Moderate

Steps

Time Required

                          15 - 25 minutes

Sections

Transistor
5 steps

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Introduction

An indicator that a transistor has broken on a touch lamp is that it will revert to static “on” and “off“ options.

It is important to note that this is also a general guide, and will not necessarily match your lamp. If you do not already have a replacement transistor ready to use, follow the guide to step 4 and look on the transistor for its specifications so that a replacement can be ordered.

Be sure to unplug your lamp prior to beginning the guide. Soldering is required for this guide, if you do not have soldering skills, check out the How to Solder and Desolder Connections article on the site.

What you need

Step 1

              Transistor

Failure to unplug device or remove lightbulb may result in damage to device or persons. Always take care when handling electronics.
Always unplug device before removing the bulb.
Unplug and romove the lightbulb from the lamp to avoid accidents.

Failure to unplug device or remove lightbulb may result in damage to device or persons. Always take care when handling electronics.

Always unplug device before removing the bulb.

Unplug and romove the lightbulb from the lamp to avoid accidents.

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Step 2

This is a general guide for transistor repair, screw sizes may vary with lamp model.
Using the Phillips #00 screwdriver, remove the 5 mm screws holding the bottom plate to the bottom of the lamp.

This is a general guide for transistor repair, screw sizes may vary with lamp model.

Using the Phillips #00 screwdriver, remove the 5 mm screws holding the bottom plate to the bottom of the lamp.

Step 3

Remove the bottom panel and locate the circuit box. The circuit box is usually a small plastic container with several wires entering it.

Remove the bottom panel and locate the circuit box. The circuit box is usually a small plastic container with several wires entering it.

Step 4

Be careful not to damage any of the electronic components on the board while prying open the box.
Pry open the circuit box with your fingers or plastic opening tool and remove the circuit board.

Be careful not to damage any of the electronic components on the board while prying open the box.

Pry open the circuit box with your fingers or plastic opening tool and remove the circuit board.

Step 5

Locate the transistor.
Note the location of the three pins of the transistor.
Soldering irons can heat up to excess of 500 degrees Fahrenheit. Take caution when soldering. If you need more information on soldering check out How to Solder and Desolder Connections
In this image I am using a pencil to model a soldering iron.
On the reverse side of the board, carefully desolder these three pins and remove the broken transistor.
Pay attention to the direction in which the new transistor is facing, Solder it in where the damaged one was removed. Ensure that no solder from each of the pins contact each other or any other component.

Locate the transistor.

Note the location of the three pins of the transistor.

Soldering irons can heat up to excess of 500 degrees Fahrenheit. Take caution when soldering. If you need more information on soldering check out How to Solder and Desolder Connections

In this image I am using a pencil to model a soldering iron.

On the reverse side of the board, carefully desolder these three pins and remove the broken transistor.

Pay attention to the direction in which the new transistor is facing, Solder it in where the damaged one was removed. Ensure that no solder from each of the pins contact each other or any other component.

To reassemble your device, follow these instructions in reverse order.

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Author

                                      with 1 other contributor

                    James Parker

Member since: 02/02/2021

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Team

                       Embry-Riddle Aeronautical University, Team S7-G12, Rauch Spring 2021                        

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                                            1 Guide authored

Dave Empson - Apr 12, 2022

The touch lamp I repaired had a slightly different lighting control box labelled MT-1009A (perhaps it was just an off/on). Anyway I followed the same procedure as above and soldered in a new 3 pin triac (BT134 PH600E) and all worked well. Good pictures, thanks

Introduction#

What you need#

Team#

Introduction

What you need

Team