Crystal(Ctrl B/D : X1) Damage - HP PL4260N Service Manual

(2) In case of IC damage, corresponding IC inside of TCP,
pictures by IC unit inside of TCP will not appear or Mis -
discharge. In most cases, the burnt mark can be seen
when IC failure occurs.
Test Point : Enlarge after measuring output of GND ~ TCP
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Wave format : Output wave doesn't come out
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<Fig. 8 TCP Normal Output Wave >

3-5. Crystal(CTRL B/D : X1) Damage

(1) When Crystal is damage, the screen doesn't be shown.
Test Point : Enlarge after Measuring
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3pin of GND ~ Crystal(CTRL B/D: X1)
Wave format : Output wave doesn't come out
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<Fig. 9 Crystal Normal Output Wave >
(2) In case of unusual launch of the Crystal, it may blink the
screen.
Test Point : Enlarge after Measuring
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3pin of GND ~ Crystal(CTRL B/D: X1)
Wave format : As shown fig. 10
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<Fig. 10 When Crystal is poor>