Introduction To Display Troubleshooting - Nokia RM-824 Service Manual

RM-824; RM-825; RM-826
BB Troubleshooting Guide
Item Bright dot defect (R & G & B are 0)
Red
R0
Defect
counts
R40
R41
R255
Note: Blinking pixels are not allowed in normal operating temperatures and light conditions.

Introduction to display troubleshooting

The display module used is based on AMOLED technology and supports the display format of 800 columns x
480 rows. The dimension of the display module is 61 mm x 103.7 mm x 1.11 mm. The display is connected
to MSM8960 with a 4-lane MIPI DSI.
The following references on the PWB help in the effective debugging and troubleshooting of the display.
Sr No
1 X1350
The following test points on the PWB help in the effective debugging and troubleshooting.
Sr. No Signal name
1 VDDI
2 VPNL
3 ELVSS
4 ELVDD
Issue 2
Table 7 Defects table
Green
G0
Acceptable
G30
G31
Not acceptable
G255
Reference
Display connector
Measuring point
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Copyright © 2012 Nokia. All rights reserved.
Blue Red
B0
2 dim dots
acceptable
B70 NA
B71 R201
B255 R255
VREG_L23_1V8
VPH_PWR
Negative supply to display -4.0V
Positive supply to display 4.6V
Dim dot defect (G is 0)
Green
G0
Not
acceptable
G230
G231
Acceptable
G255
Description
Description
Blue
2 dim dots
acceptable
NA
B101
B255
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