Display/Illumination Problems - Ericsson A2618s Troubleshooting Manual

5 Display/Illumination Problems

5.1 Display
Start the unit by pressing the On/Off key.
If the unit does not start, go to chapter 3 ("On/Off Problems").
Use the Service Test menu.
Choose "Display" and check the chess pattern.
If the display is missing one or more of the segments, go to section 5.1.1.
If there is nothing displayed on the display, go to section 5.1.2.
5.1.1 Segments are missing
Open the unit and check for liquid damage.
No action is to be taken for a liquid damaged unit, send the unit on according to the local
company directives.
Replace the display and the elastomer.
5.1.2 Nothing shows on the display
Open the unit and check for liquid damage.
No action is to be taken for a liquid damaged unit, send the unit on according to the local
company directives.
Replace the display and the elastomer, and check if the display works correctly.
If the fault remains, measure the voltage at X850: 5, 2.7 ± 0.10 V
If the voltage is incorrect, measure the resistance of R864 (1,0 kohm).
If the resistance is incorrect, replace R864.
If the voltage still is incorrect, send the unit on according to the local company directives.
Measure the voltage at X850: 6, 2.7 ± 0.10 V
If the voltage is incorrect, measure the resistance of C850 (>10 kohms) and C852 (>100
kohms).
If the resistance is too low, replace the incorrect component.
If the voltage still is incorrect, send the unit on according to the local company directives.
Measure the voltage on X850: 7, 2.7 ± 0.10 V
If the voltage is incorrect, measure the resistance of R850 (470 ohm).
If the resistance is incorrect, replace R850.
If the voltage still is incorrect, send the unit on according to the local company directives.
4/00021-2/FEA 209 544/25 A
Trouble Shooting Guide, Standard
. (RESET) Fig .5.1.
DC
. (VDIG) Fig .5.1.
DC
2
. (I CDAT) Fig. 5.1.
DC
13(24)