Nokia 6220 Service Manual

RH-20

Company confidential 

CCS Technical Documentation

Page 46

 Nokia Corporation.

Issue 1  10/2003

Start

Are the display 
LED's working?

Try to change display. 

Are the LED's  working 

now?

Retest failing display

Check X302 (solder 

joints). Is it OK?

Change X302

Measure VLED+ and VLED-.  

VLED+ = ~7.5V and VLED- 
= ~0.5V when LED driver is 

enabled. Are they OK? 

(Notice: VLED+=VBATT 

when driver is disabled)

No

No

Yes

End

Yes

No

Check N300, L300, V300, R300,C303,C304.

If not OK, change defect part.

No

Yes

Are the 

keyboard LED's 

working?

Yes

Try to change UI PWB. 

Are the LED's  working 

now?

Retest failing UI PWB

Check X301 (solder 

joints). Is it OK?

Change X301

Measure VLED+.  VLED+ = 

~7.5V when LED driver is 

enabled. Is it OK?

No

Yes

Yes

No

Check N300, L300, V300, R300,C303,C304.

If not OK, change defect part.

No

Check all LED's in UI PWB 

(V101 - V106). Are they OK?

Change defect parts

No

Yes

No

Retest

Yes