Acer RA19WAANU 5.11Checking the DC/DC converter circuit, 30 5.Troubleshooting (continued)

1 36

Checkthe 5V is output from P301 pin 5,6

NG FailurePoint

1)Power wire disconnection.

2)Power board is failure.

Checkthe 5V is input to I301 pin3.

NG FailurePoint

1)Printed wire broke between P301 pin 5,6

andI308 pin3.

Checkthe 3.3V is output from I301 pin2, 4.

FailurePoint

I301is failure or C303,C304 short.

Checkthe 3.3V is input to I309 pin3.

NG FailurePoint

1)Printed wire broke between I302 pin2. 4 and

I309pin3.

Checkthe 1.8V is output from I309 pin2,4.

FailurePoint

I309failure or C368 short.

FailurePoint

1)Printed wire broke between I301 pin2,4,I309 pin3,2,4

andI308

2)FB309,FB310 is open.

5.11Checking the DC/DC converter circuit

Go to cover page

30 5.Troubleshooting (continued)

ACERX193HQ

Contents

Main Model ID:RA19WAANU Service Manual DBG DPBU IIDBG DPBU II Service ACER ACER_LCD_X193HQ_SM080904V1 Page Page . Page PresetTiming Chart . Page 2.1 MAIN OSD MENU Outline: ACERX193HQ 8 The description for control function: 2OSD Menu Page Page Page S4 S5 S2 S3 S1 S11 S10 S6 S12 S8 S7 Page S6 S5 S7 S3 S4 Page Page S20 S21 S22 S23 Page 5.2 Nothing displays on the screen (Screen is black and colour of LED is blue.) 20 5.2 Nothing displays on the screen (Screen is black and colour of LED is blue)continued 21 5.3Checking the back light unit 22 5.4 Abnormalscreen for VGA 23 5.5 Abnormalscreen (For the DVI) 24 5.6Abnormal OSM display adjust problem 25 5.7Abnormal plug and play operation for VGA 26 5.8 Abnormalplug and play operation (For the DVI) 27 28 5.Troubleshooting (continued) 5.9.2Checking the control circuit of vertical sync pluse 5.10Checking the resolution change IC movement 29 5.11Checking the DC/DC converter circuit 30 5.Troubleshooting (continued) Page Page cedid Page LCD Flat Panel Interface Board Interface Board Audio line input Video Signal input DDC& Function key input