Philips PDP42V7 series, Руководство по обслуживанию

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Service Modes, Error Codes, and Fault Finding EN 19 LGE PDP 5.
Figure 5-49 Set_Up FET defective
Figure 5-50 Set_Down FET defective
Figure 5-51 Reset section normal output
SCAN IC (Y-DRV board: IC1-8)
1.
In case of the SCAN IC is damaged, one horizontal line
may be open on the screen.
–
Test Point: ICT measurement of GND-Y DRV board
output.
– Wave format: As shown below figure.
2. When the SCAN IC is damaged (poor, external electricity,
or spark), there might be no picture.
–
Test Point: ICT measurement of GND-Y DRV board
output
– Wave format: Output wave format is not generated
(you can see if Y DRV board Top or Bottom’s SCAN IC
is damaged).
3. Screen shaked horizontally when Y DRV board Top and
Bottom cable is damaged.
–
Test Point: ICT measurement of GND-Y DRV board
output.
– Wave format: As shown in figure "Y DRV board Top
and Bottom cable damaged".
4. Overlap of two horizontal lines on the screen in case of
shorted SCAN IC output.
–
Test Point: ICT measurement of GND-Y DRV board
output.
– Wave format: As shown in figures "SCAN IC shorted
output" and "SCAN IC normal output".
– Measurement point: SCAN section, output ICT of Y
DRV board (full white pattern).
Figure 5-52 SCAN IC defective
Figure 5-53 Y DRV board Top and Bottom cable damaged
Figure 5-54 SCAN IC shorted output
Set_up waveform
does not come out
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