Hitachi 43FDX01B Service Manual - Page 28
EN 28, LGE PDP 2K6
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EN 28 8. LGE PDP 2K6 8.2.5 Z-SUS Alignment Alignments P4 P2 P1 FS1 FS2 FS3 P6 VRzb B28 P5 Q18 Vzb GND G_16391_010.eps 020707 Figure 8-6 Z-SUS alignment Condition • Set up a situation as shown in "Measuring equipment connection diagram". • Check if the voltages Vs and Va of the PSU are correct (see PSU label and PSU Alignment 8.2.3). Vzb (Z bias) Voltage Adjustment 1. Measure the voltage between the Vzb test point (the drain of Q18) and GND on the Z-SUS board (see Figure "Z-SUS Alignment"). 2. Adjust Vzb to 100 ± 0.5 V with potentiometerVRzb on the Z-SUS board. 8.2.6 Internal Test Patterns The CTRL board is capable of generating its own video test patterns. To generate the test patterns, do as follows: • Disconnect the mains cord. • Disconnect the SSB of the TV set, by removing the cables of connectors 1M03 and 1M46 on the PSU. • Reconnect the mains cord. • Connect pins 1 & 2 or pins 3 & 4 of Connector P1 on the Control Board (see Figure below) to each other. • Now the internal test patterns are automatically shown in a loop. CTRL board P2 IC12 +3.3V P7 1 X1 P3 D12 D13 D14 D15 +1.8V IC1 VS_DA IC11 +3.3V IC13 TRIGGER POINT P4 P10 P11 P1 G_16391_012.eps 020707 Figure 8-7 P1: Connector for Internal Test Patterns