Tuesday, October 02, 2012

TOSHIBA -DLP Projection TV Light Engine Replacement 46HM84 46HMX84 53HM84 52HMX84 62HM84 62HMX84

Talen Light Engine Disassembly 
Lamp Socket Removal.
     Remove two small screws marked here the female lamp socket to the frame of the light engine lamp housing.
Ballast Power Circuit Cover Removal
     Remove two small screws securing the cover to the floor of the Light Engine.  Feed lamp socket and wires the hole at the top cover.  
Ballast Power circuit PC board removal.
     Disconnect the Power Input; 300V; from the Main Power Supply board.  Disconnect the plug from DMD PC board that connects to vertical PC board on the Ballast Supply.  Push four retaining clips back to release the PC board.  
Thermostatic circuit breaker removal
     AC Power at 120V wall current flows through the thermostatic circuit breaker.  So be careful to unplug the AC cord from the wall socket, before proceed.  
Remove two self tapping screws securing the thermostatic circuit breaker to the top of lamp frame housing.  A good thermostatic circuit breaker should mesure 'Zero' ohms resistance, and bad breaker will measure as open.  The temperature cutoff is at 150 degree C and 302 Degree F.  The circuit breaker monitors the lamp temperature.  The action cuts off AC from the set and main processor was never turned off.  
     The LED blinking code for Thermal Shut down is, a Blinking Red LED, 3 seconds, and 3 seconds Off.  The Green LED will be Off.  
Thermostatic Circuit Breaker Removal
IR | UV Filter cover removal.
     After removal of thermostatic circuit breaker, remove two small screws securing the cover to the floor of the Talen Light Engine.
Fans Removal
     The two cooling fans are used with the light engine.  The first fan is, Lamp Exhaust that provides cooling to the lamp.  The other fan provides cooling to DMD.  Both fans are connected to the Main Power supply.  Both fans are variable speed type, and controlled by back End Processor {BEP}.  Both fans have rotation sensors for fan stop condition.
     Remove 2 scres with letter [A] securing the lamp exhaust fan housing to the floor of the Light Engine.  Remove 2 large scres with letter [C] securing DMD cooling fan bracket.  
                                         Part number for Fans are:  23125919 & 21325920.
                                                               Lamp Assembly
                                                         UV | IR filter assembly.
                                                                      Integrator
                                                        DMD Formatter PC board
                                              Projection Lens output to the Screen.