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

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

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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Rae-3