Lexmark X642e Service Manual page 188

7002-xxx
FRU
3 LCD inverter card
Operator panel right cover
assembly
LCD touchscreen display
2-150
Service Manual
Action
Check the voltages at CN1-1 and CN1-2.
LCD Touchscreen display
Connector CN1 (LCD inverter card)
CN1–1 Power
CN1–2 Power
CN1–3 Ground
CN1–4 Ground
CN1–5 Lamp Off
CN1–6 Vbright adj
CN1–7 Ground
CN1–8 Ground
Note: All voltages are approximate values.
*approximate, depending on brightness.
If the voltages at CN1-1 and CN-2 are incorrect, replace the LCD
inverter card. See "LCD inverter card assembly removal" on
page 4-108.
If this does not fix the problem, replace the operator panel right side
cover assembly. See "Operator panel right cover assembly
removal" on page 4-64. If the voltages at CN1-1 and CN1-2 are
correct, replace the inverter card. If this does not fix the problem
replace the touchscreen display. See
models X644e and X646e" on page
Display dark Display lit
+12 V dc +12 V dc
+12 V dc +12 V dc
0 V dc 0 V dc
0 V dc 0 V dc
0 V dc +4 V dc
0 V dc +4 V dc*
0 V dc 0 V dc
0 V dc 0 V dc
"LCD touchscreen removal—
4-67.