Service manual

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4 – 13

LCD & inverter

CHECKING THE INVERTER BOARD

Table 4-3 suggests areas where problems may occur and provides corresponding corrective actions. The compo-

nent sites of the inverter board are shown in Figure 4-6.

TABLE 4 – 3

INVERTER BOARD

CHECK AREAS

Warning

Inverter boards have high-

voltage areas. To prevent

electrical shock, do not

touch the board when the

system is on.

INVERTER BOARD

COMPONENT SITES

FIG. 4 - 6

CN1

CN2

CN1 Inverter to JINV1 on

M/B

Pin Signal

1VIN DC

2 BRGHT

3ON/OFF

4GND

Area to Check Action

Fuse 1.0A (F1) Check the fuse and replace it if necessary.

Connector CN1

Check if the voltages of all the pins of this connector are correct. (see the

following figure). If any of the pins presents an incorrect voltage, check if

the connection between the inverter board and the system board is OK. If

the connecting cable is loose or frayed, plug it in or replace it. If the

problem still persists, replace the inverter board.

Connector CN2

Check if the cable connecting the LCD lamp to the inverter board is well

plugged into connector CN2. If there is no connection problem, replace

the inverter board.

JINV1