TH-42LFE6W 1 Safety Precautions 1.1. General Guidelines 1. When conducting repairs and servicing, do not attempt to modify the equipment, its parts or its materials. 2. When wiring units (with cables, flexible cables or lead wires) are supplied as repair parts and only one wire or some of the wires have been broken or disconnected, do not attempt to repair or re-wire the units.
TH-42LFE6W 2 Warning 2.1. Prevention of Electrostatic Discharge (ESD) to Electrostatically Sensi- tive (ES) Devices Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Elec- trostatically Sensitive (ES) Devices. Examples of typical ES devices are integrated circuits and some field-effect transistors and semiconductor “chip”...
TH-42LFE6W 2.2. About lead free solder (PbF) Note: Lead is listed as (Pb) in the periodic table of elements. In the information below, Pb will refer to Lead solder, and PbF will refer to Lead Free Solder. The Lead Free Solder used in our manufacturing process and discussed below is (Sn+Ag+Cu).
TH-42LFE6W 3 Service Navigation 3.1. Service Hint Board Name Function P-Board Power supply Non serviceable. P-Board should be exchanged for service. A-Board Digital core signal processor Non serviceable. A-Board should be exchanged for service. GK-Board Switch Non serviceable. GK-Board should be exchanged for service.
TH-42LFE6W 4 Specifications Power Source 220-240 V AC, 50/60Hz Power Consumption Rated Power Consumption 65 W Stand-by condition 0.5 W Power off condition 0.5 W Sound 22 mm × 90 mm × 2 pcs Speakers Audio Output 10 W [5 W + 5 W] (10 % THD)
TH-42LFE6W 5 Service Mode 5.1. CAT (Computer Aided Test) mode How to access the CAT mode. Method A Main unit + remote control operation Press and hold the button on the right side of the unit and press the RECALL button on the remote control 3 times quickly within 2 second, this will place the unit into the CAT mode.
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TH-42LFE6W 5.1.2. CD mode Select the CD mode by Up/Down button on the remote control at the front page of CAT mode and then press the Mute button on the remote control more than 3 seconds. Memory data change To exit the CD mode, press the R button on the remote control.
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TH-42LFE6W 5.1.3. SD mode Select the SD mode by Up/Down button on the remote control at the front page of CAT mode and then press the Action button on the remote control. To exit the SD mode, press the R button on the remote control.
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TH-42LFE6W 5.1.5. NW mode Note : To use the network function, set each "Network Setup" setting and make sure to set the "Control I/F Select" to "LAN". Select the NW mode by Up/Down button on the remote control at the front page of CAT mode and then press the Action button on the remote control.
TH-42LFE6W 6 Troubleshooting Guide 6.1. Self Check 6.1.1. Display Indication 1. Self-check is used to automatically check the bus line controlled circuit of the LCD display. 2. To get into the Self-check mode, press the volume down button on the right side of the unit, at the same time pressing the OFF-TIMER button on the remote control, and the screen will show.
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TH-42LFE6W 6.1.3. LCD Panel test mode The failure-diagnosis by LCD Panel test mode To find the possible failure point where in LCD Panel or Printed Circuit Board when the abnormal picture is displayed. [How to display the test pattern] (A) Main unit + remote control operation 1.
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TH-42LFE6W [Diagnostic flow chart] It displays. Is a test pattern Failure of A-Board displayed normally? It is still abnormal. It is abnormal. Failure of LCD Panel Is a part abnormal (rarely failure of A-Board or FR-Board) even in a test pattern?
TH-42LFE6W 6.2. No Power First check point There are following 3 states of No Power indication by power LED. 1. No lit. 2. Green is lit then turns red blinking a few seconds later. 3. Only red is lit. 6.3.
TH-42LFE6W 7 Disassembly and Assembly Instructions 7.1. PCB Layout 7.2. Preparation 7.3. About disassembly replacement Please pull soft cloth etc. not to damage a screen and please turn the front of a main part down and lay it down Cautions when replacing each component •...
TH-42LFE6W 7.4. Back Cover removal 7.5. A-Board replacement 1. Remove the screws, and then remove the Back Cover. 1. Disconnect the connectors and remove the screws. Caution when attaching the Back Cover • Please tighten 4 screws fixing Back Cover of the following figure, pressing down the dotted line part (A, B) of a rear panel in the direction of an arrow.
TH-42LFE6W Caution when replacing the A-Board Caution after replacing the A-Board • Gaskets are enclosed in the A-Board for repaire. Please • Since the electronic switch is adopted as a power switch stick the gaskets on the position of the following figure of main unit, how the rise of the power of the initial state when replacing the A-Board.
TH-42LFE6W Caution when replacing the P-Board Cautions when removing/attaching the GK-Board • A Heat Rubber is attached between the P-Board and • When removing the GK-Board from the Key Button Barrier P PCB LCD. Bracket, please remove it carefully to five hooks.
TH-42LFE6W 7.9. K-Board, LED Panel and LED 7.11. Rear Panel Top/L/R Assy Panel Case replacement replacement 1. Disconnect the connector, and remove the K-Board, LED 1. Remove the Speaker Unit L/R. Panel and LED Panel Case. (Refer to “7.8. Speaker Unit L/R replacement”) 2.
TH-42LFE6W Caution when attaching the Rear Panel Top/L/R Assy Caution when attaching the Rear Panel Metal Bot L/R • As shown in the following figure, please insert the part of • Please check that the hooks (positioning) of metals are A correctly.
TH-42LFE6W 7.14. Rear Panel Metal Top/L/R 7.15. LCD Panel replacement replacement Caution about the sticking parts of LCD Panel • The sticking parts for LCD Panel are enclosed. 1. Remove the Speaker Unit L/R. When replacing the LCD Panel, please replace the sticking (Refer to “7.8.
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TH-42LFE6W Caution when replacing the LCD Panel • Please stick the Model Name Sheet on the position of the following figure when replacing the LCD Panel. About the wire arrangement after replacing the LCD Panel • Please refer to the “Wiring Connection Diagram”.
TH-42LFE6W 7.16. Caution about the sticking parts of LCD Panel • Please remove the Barrier P PCB from the old LCD Panel and stick it on the new LCD Panel for repair. • Please stick the tapes according to the sticking position of the LCD Panel for repair after connecting the LVDS FFC.
TH-42LFE6W 8.2. Main Block Diagram DIGITAL CORE SIGNAL PROCESSOR SOUND15V MAIN CPU SERIAL AUDIO SIGNAL SPEAKER(R) AUDIO SPEAKER(L) LAN DATA SOS DET CONTROL D3.3V +3.3V LAN TERMINAL D1.2V +1.2V MII DATA R+/- LINE AMP L+/- LINE OUT NETWORK AUDIO LAN3.3V...
TH-42LFE6W 8.3. Block (1 of 2) Diagram JK3505 JK3503 JK4002 JK4004 PC/DVI RS232C_IN AUDIO IN DVI-D IN HDMI IN1 DIGITAL SIGNAL PROCESSOR (SEIRIAL IN) NETWORK IC2701 IC2704 CONTROLER Q2706 RXD_LAN LAN CONTROL JK2701 TXD1 UART TXD_LAN DATA RXD1 LAN TERMINAL...