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Figure 7-3: Low Pass Filter and Summing Amplifiers 7-4 Convergence Output Circuitry Figure 7-4 shows the Convergence Output circuitry located on the PCB-Power. The correction signals Figure 7-4: Convergence Output Circuitry are amplified and directed to the Sub Vertical and Sub Horizontal coils located within their respective red, green and blue Deflection Yokes. Chapter 8 Sound Circuitry Figure 8-1: Sound Circuitry - Overall Block Diagram The V23 Sound Circuitry is shown above in the Overall Block Diagram, Figure 8-1. The Sound Source Select circuitry selects the sound source for both the main and sub pictures. The sources correspond to the Video Inputs: • Main Tuner • Sub Tuner (monaural only) • Three External NTSC Inputs • Two Component Inputs (DVD) • DTV • DVI • VGA • DM (Analog Audio from a digital source) The sound signal from the DM Module is initially received in a digital format, from the ATSC/QAM Tuner or the IEEE 1394 inputs. The remainder of the circuitry is conventional: • MCS Decoder circuitry decodes the Main Tuner sound signal, generating mono, stereo, or SAP signals when broadcast. • Main picture sound from the Select circuitry takes two paths: 1) To Audio Control circuitry 2) To the Monitor Outputs • The Audio Control circuitry performs adjustments to the Volume, Treble, Bass, etc. The outputs from Audio Control circuit are directed to the Audio Amplifier, and then to the set’s speakers. • Sub picture (PIP) sound, from the Source Select circuit is directed to the PIP Sound Output Jacks. 8-1 8-2 Figure 8-2: Overall Sound Circuitry Block Diagram Overall Sound Signal Path Figure 8-2 illustrates the Overall Sound Circuitry Block Diagram. The AV/SW ICs, IC2L00 and IC2K00, used to select Main and Sub Picture Video/ Color are also used to the select the Sound sources. IC2L00 selects Main and Sub sound sources from the Main Tuner (decoded by MCS circuitry in IC3A01), Sub Tuner, External NTSC Inputs 1-3 and from Component Inputs 1 and 2. The selected signals are directed to IC2K00. IC2K00 selects the signals from either IC2L00, DVI, DTV, VGA Inputs or the DM Module. The Sub (PIP) sound signal is routed from IC2K00 to the PIP Sound Output Jacks. The selected main Sound signal is directed to Audio Control circuitry, also in IC3A01. The sound signal from IC3A01 is amplified in IC3E01 and directed to the speakers. The input signals to IC3A01 are also directed to the Monitor Output Jacks. Only fixed level sound is available at the Monitor Output Jacks. Digital Audio Output There is one additional audio output signal in the V23 chassis, External Digital Audio Output on the rear of the DM. This is an AC-3 digital data stream (when available from a digital source). It allows connection to an external A/V Receiver with an AC-3 Decoder. If the signal has been fully encoded, the AC-3 Decoder is capable of producing 5.1 surround sound, 5 full audio channels (20 kHz) and one low frequency enhancement channel (120 Hz). 8-3 8-4 Chapter 9 Troubleshooting Tips LED Indications Conditions Probable Cause Off After AC is applied No Standby Power or TV .PC not running Fast Blink for 70 sec. After AC is applied Normal - DM .PC is booting up. Fast Blink for 70 sec. Each time TV is switched On Power Save Mode is activated Fast Blink (Doesn't stop) After AC is applied TV .PC is running, but DM failed to boot up Slow Blink Set is Off Normal - Timer is set for Auto Turn On Table 9-1: Power LED Indications Use the following tips when troubleshooting the source of a problem in the V23 chassis. Using The Front Panel LED The Front Panel LED helps isolate the cause of the following problems. • The TV will not turn On. • The TV turns On, and then Shuts Off. If the TV will not turn On, the LED response indicates the possible cause of the problem. Table 9-1 lists the possible LED response when this problem occurs. When the TV turns On and then shuts Off, the LED Diagnostic Error codes help isolate the problem. This is the same LED Diagnostic featured on some previous model TVs. Figure 9-1 shows the LED Error Code Activation Pro cedure, an is describe in the following: 1) With the TV Off 2) Press and hold the front panel "MENU" and "DEVICE" buttons for 5 seconds. 3) The LED will flash the Error Code indicating what caused the TV to shut Off. 4) The Error Code will be repeated 5 times. 5) When the LED stops flashing the mode is automatically terminated. Reading the Error Codes The Error Codes are two digit numbers. The LED: • Flashes the value of the most significant digit (MSD). • Then there is a pause. • Flashes the value of the least significant digit (LSD). • The Error Code is repeated 5 times. As an example, Figure 9-2 illustrates the LED drive for Error Code "23". Table 9-2 lists the Error Codes and their possible cause. 9-1 DM Module Check When the TV turns On, but a problem exists that may be caused by the DM Module, perform the following two checks: 1) Select the DTV Antenna as the source an select and HD Channel. 2) Select an...

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