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EN 22
5.
LGE PDP 2K6
Figure 5-38 SCAN IC defective
115V
Figure 5-39 SCAN IC shorted output
Figure 5-40 SCAN IC normal output wave
TCPs
1. In case of shorting or opening of TCP IC output, the screen
may show one or several vertical lines.
Service Modes, Error Codes, and Fault Finding
G_16390_052.eps
150806
7us
7us
60V
F_15590_031.eps
040705
G_16390_053.eps
150806
–
Test Point: Output TP of GND-TCP
–
Wave format: As shown in figure below. In case of
normal wave output, when STB signal is generated,
the output must maintain "HIGH". When STB signal is
generated again, the output must fall to "LOW". But
when the TCP IC is damaged, the STB signal is not
generated, and the output falls to "LOW".
2. In case of IC damage, the screen may show no image on
the corresponding part, or mis-discharge. In most cases
you can see a burn mark on the IC.
–
Test Point: Output TP of GND-TCP
–
Wave format: No output wave.
' '
Figure 5-41 COF IC output defective
Figure 5-42 TCP normal output
Crystal (CTRL board: X1)
1. When a crystal is damaged, the screen is not shown.
–
Test Point: 3-pin of GND-Crystal (CTRL board: X1).
–
Wave format: Output wave is not generated.
2. In case of unusual start-up of the crystal, the screen may
blink.
–
Wave format: As shown in figure below.
–
Measurement position: Measuring output 3-pin of
crystal (CTRL board: X1).
F_15590_033.eps
060605
F_15590_034.eps
060605
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