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PF768, Standard Electrical Repairs
* If the resistances and the VRPAD voltage are correct, replace the V608
diode.
* If the voltages at the diode (except VRPAD) still are incorrect after
replacing it, make sure pin 96 of D600 is correctly soldered.
* If the soldering is correct, replace C632 (class A, fig. 5.2) and meas-
ure the voltages again.
* If that doesn't help, replace D600 (class B).
• If the VRPAD voltage is incorrect, proceed to chapter 3 ("Doesn´t start"-fault).
Fig. 5.4
• If the voltages at V608 are correct but there still isn't anything showing in the
display, measure the voltages at the display pads (H622, fig. 5.4).
2
Pad 1 – (I
C-CLOCK): ~3.2V
2
Pad 2 – (I
C-DATA): ~3.2V
Pad 3 – (VDIG): ~3.2V
Pad 4 – (VDIG): ~3.2V
Pad 5 – (GND)
Pad 6 – (VLCD): ~4.6V
Make sure there's VLCD voltage (~4.6V) at pad 5.
4/00021-2/FEA 209 544/11.C
Fig. 5.3
31
(68)
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