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Panasonic LX600 Technical Information
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Panasonic LX600 Technical Information

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LX600 LCD TV Technical Information

TC-32LX600

Outline

Protection Shutdown
Troubleshooting
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Summary of Contents for Panasonic LX600

  • Page 1 LX600 LCD TV Technical Information TC-32LX600 Outline Features Overall Block Diagram A Board Main Layout Power On Sequence Protection Shutdown Troubleshooting Adjustments...
  • Page 2 Features TC-LX60 Model TC-LX600 Display Capability 480p/720p/1080i 480p/720p/1080i Aspect Ratio 16:9 (Widescreen) 16:9 (Widescreen) Aspect Control Normal, Zoom, Full, and Normal, Zoom, Full, and Just Just Resolution (Number of 1,049,088 (1366x768) 1,049,088 (1366x768) Pixels) pixels pixels Contrast Ratio Up to 3000:1...
  • Page 3 Overall Block Diagram The TC-26/32LX60 and 600 series LCD Direct View TVs differ from previous models in that all signal processing is accomplished on the A board. The video processing function that had been previously accomplished by the DG board is now performed on the A Board by IC4002. This IC serves as the Main micro and Video /Audio Panel controller.

  • Page 4: Board Layout

    Non - Serviceable Non - Serviceable Non - Serviceable This is the board layout of the TC-LX600 LCD Television. The P board, DT board, and A board are non serviceable. The G board, AP board, and V board are serviceable.
  • Page 5 Board Layout Pictorial P Board – The Power unit is responsible for generating the Standby 7V, 10V, and 24V, which provides input to some of the regulators on the AP Board. It also generates the switched 24V inverter voltage. AP Board –...
  • Page 6 Board Description...
  • Page 7 The unit is equipped with a single ATSC tuner which plugs directly onto the A board. The LX60 features a single HDMI interface while the LX600 offers two. The connectors and pin outs provided in this diagram are, for the most part, the only available access points for board level repair troubleshooting.
  • Page 8 A Board Video Processing Video processing is performed on the A board. The A board incorporated in these models is now responsible for signal processing, and system control operation. The video processing function that had been performed by the DG board of the previous models is now accomplished on the A Board by IC4002.
  • Page 9 A Board Audio Processing Audio processing is performed on the A board. Audio signals from the DVI, Component, and the Composite video input enter the Audio Switch IC2006 where the desired input is selected. HDMI Audio is processed and converted into a one bit digital audio format by the HDMI IF receiver, IC5004.
  • Page 10 Power On Sequence 1.The Standby 7V (STB_7V) is generated on the P board (non- serviceable) when AC power is applied. This can be measured on Pin 3 of Connector AP4/A4. 2.The STB_7V is regulated to 3.3 V on the Main board and applied to the Main Video and Audio Controller IC4002.
  • Page 11 AP Board Power Distribution The AP Board is responsible for the regulation, distribution and dissemination of all secondary voltages derived from the 24V and 10V source supplies on the P Board. The 7V STBY voltage is present when the unit is plugged into the AC outlet. When the main power switch is activated, it is sensed on the main board by IC4002.
  • Page 12 Main 5V Supply The Main 5V, Main 9V, Sound 20V, and Panel 12V supplies are very similar in their design and operation. Panasonic utilizes several Buck regulator circuits to generate these voltages. The primary difference is that the input voltage to the Main 5V regulator is 10V whereas the 9V, 20V, and 12V supplies use 24V.
  • Page 13 SUB 9V and 30V Tuner Supply The SUB 9V and BT 30V Tuner sources are generated by the same switch mode power supply IC, IC7209. The supply encompasses the design of both Buck and Boost regulator circuits. 1. A soft-on enable is provided on pin 5 of IC7209 during the initial power on sequence as capacitor C7294 charges.
  • Page 14 AP Board Protection Shutdown The protection shutdown circuit is designed to monitor for a short or loss of the 10V, 30V, Sound 18V,and the Panel VCC sources. If any of these voltage sources go low, it will cause Q7210 to conduct. As a result, the collector of Q7211 goes low to signal a shutdown condition to IC4002 on the A board.
  • Page 15 AP Board Test Point Locations This page shows the test points that can be accessed to troubleshoot the AP board.
  • Page 16 AP Board LCD Power Distribution Connector AP1 provides the switched 24V from the power unit to the LCD Panel via connectors AP5 and AP7. The 24V can be monitored on connector AP5 or on jumper JS7455.

  • Page 17: Adjustment Procedure

    Adjustment Procedure How to enter adjustment mode While pressing the VOLUME DOWN button of the main unit, press the RECALL button of the remote control transmitter three times in a row within two seconds. Adjustment method..Use the remote control. # 1. button...Main items Selection in forward direction # 2.
  • Page 18 Adjustment Main Item Sub Item Remarks Sample Data PCT-ADJ COLOR Video level (RF, video, component) R-Y-A Video level (RF, video, component) R-Y-G Video level (RF, video, component) BACK-L Tint Adjustment TINT Sub Color WB-ADT B-CENT Sub Tint G-CENT Sub Back Light R-CENT Sub Bright B-GAIN...
  • Page 19 How to Access the Self-check Screen Access 1. Place the unit in TV mode. 2. While pressing the VOLUME DOWN button on the main unit, press the SLEEP button on the remote controller unit simultaneously Exit 1. Press one of the channel selection buttons to return to the normal screen.
  • Page 20 No Video From Tuner Check and see if the Tuner Activity indicator is on RED. It is visible through the holes on the cover plate. Is the Tuner Activity indicator on? Check for the BT 30V, SUB 9V, &, SUB5V voltages on connector AP3 Replace Tuner of the AP board.
  • Page 21 No Video, Dark Blue Screen Try using a different video input source. Try the Tuner, Component, S-Video or No Video HDMI input. Blue Screen Check the video input connections and Does any termination points for a possible cold input solder joint or connection problem. work? Check for the BT 30V, SUB 9V, &, SUB5V voltages on connector AP3...
  • Page 22 No Video, Dark Blue Screen (Continued) From the last page Remove Tuner Board From where it sits on the A board in order to access the LVDS connector. There are four screws that need to be removed. Check for LVDS activity on Pins 6, 8, 12, 14, &...
  • Page 23 No Audio A Board Try using a different audio input source. Try the Tuner, Component, S Video or HDMI input . Are other Audio inputs OK ? Determine which audio input is defective. Check for poor solder Check the L/R speaker connections in the vicinity of the output connection.
  • Page 24 No Audio From Last Page. Check for broken connector Is an audio A7 located on the A board. signal present? Check for 20V on pins 2 & 3 of connector AP3/A3 or jumper J116. Is the Voltage Check regulator IC7218 on the AP ~20V Board.
  • Page 25 No Power Turn on the Main Power Switch. Refer to AP Board test point locations Refer to AP Board test point locations Slide 13 Slide 13 Can an audible click be heard from the Power Check for 6V on pin 11 of relay? connector AP2 (RELAY.) Standby 7V...
  • Page 26 No Power From Last Page. Refer to the AP Board test point locations Refer to the AP Board test point locations Slide 13 Slide 13 Make sure connector A4 of the A board is seated properly. Unit will exhibit this condition if the connector is unplugged.
  • Page 27 Power LED Flashes NUMBER POSSIBLE CIRCUIT (MICRO PIN) SUSPECTED BOARD OF POWER LED FLASHES INVERTER SOS, NO BACKLIGHT P, Panel DETECTION (FPGA pin 6) 24V down VCTP (pin 106) A, P 9V down VCTP (pin 1) SOURCE VOLTAGE ABNORMALITY AP, A VCTP (pin 105) FPGA ABNORMALITY VCTP (pin 105)
  • Page 28 LED Blinks Seven Times Refer to the AP Board test point locations Refer to the AP Board test point locations Slide 13 Slide 13 Conduct a voltage check on the AP Board. Sound Check and replace if necessary 20V OK? IC7218 and biasing components.
  • Page 29 LED Blinks Twice Every 5 Seconds Check for 24V on jumper JS7455 or on connector AP5 pins 1-8. 24V OK? Confirm that the Inverter_SOS signal on pin 2 of connector A5 is Active High prior to changing the Unplug connector AP5 and measure LCD Panel.
  • Page 30 Examples of Defective Panels Horizontal Lines Distorted Partial Picture Green, Red, or Blue Shading...
  • Page 31 Pedestal Removal...
  • Page 32 Pedestal Removal...
  • Page 33 The End The End...

This manual is also suitable for:

Tc-32lx600Tc-lx600Tc-lx60

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