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Pda Display Dark; Ccft Lamp And Piezo Unit Faulty - Nokia 9210 Repair Hints

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Customer Care Europe & Africa
SCCE Training Group

PDA display dark

CCFT Lamp and Piezo unit faulty

If the PDA starts up (startup logo is seen), but the illumation is off, probably the piezo is broken or the backlight circuit is
-
faulty.
Check Piezo_in frequency around 135kHz (Vpp = 10 VAC) at L151 and Feedback frequency around 135kHz (Vpp = 2.7 VAC)
-
at R158. (See picture below)
Piezo_in
If Feedback frequency is around 0Hz or Piezo_in frequency is around 100kHz, change CCFT
-
is broken (see pictures below)
-
If changing the CCFT, do not forget to paste the damper (9480703) on the CCFT Lamp and Piezo unit to prevent noises and
damages. (See picture below)
If the fault persits, probably the UL2 module can also be faulty. (Refer to Service Manual/ Troubleshooting/ BL8 related PDA
-
UI problems
© 2002 Nokia Mobile Phones
CONFIDENTIAL
RAE-3
13.03.2002
Feedback
Checked by:
Customer Care Training Group
8 (17)
Repairhints
Version 2.0 Approved
(See
SB-014), because the piezo
Approved by:
SCCE

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