Set_Up Fet Defective; Set_Down Fet Defective; Reset Section Normal Output; Scan Ic Defective - Philips PDP42V7 series Service Manual

Service Modes, Error Codes, and Fault Finding
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.
Set_up waveform
does not come out
F_15590_026.eps
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Set_down waveform
does not come out
F_15590_027.eps
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F_15590_028.eps
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LGE PDP
– 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
115V
Figure 5-54 SCAN IC shorted output
5. EN 19
F_15590_029.eps
060605
F_15590_030.eps
060605
7us
7us
60V
F_15590_031.eps
040705