Acer RB23WABAS - page 30

Checkthe input I2C signal whether is changed when pressed

functionkeys on the P306 pin 4, 5

NG FailurePoint

1)Function key wire disconnection.

2)Function key wire is failure.

3)Function key board is failure.

Checkthe input I2C signal of I308 pin 50, 51 whether is

changedwhen pressed function keys.

NG FailurePoint

1)Printed wire broke among P306 pin4, R368 and I308 pin51

2)Printed wire broke among P306 pin5 ,R362 and I308 pin50

3)C393, C394 is short.

4)D352, D353 is short

FailurePoint

I308is failure.

5.6Abnormal OSM display adjust problem

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5.Troubleshooting (continued)

ACERH233H

Contents

Main Model ID:RB23WABAS Service Manual ACER Service DBG DPBU IIDBG DPBU II ACER_LCD_H233H_SM081126V1 Page Page Page Page Analoginput (VGA) treats all timings as PC-timings. Page Page Page Page Page Page Page Page S4 S1 S6 S5 S2 S12 S11 S7 S10 S9 S8 S19 S18 S16 S17 S14 Page Page Page S8 S13 S11 S12 S9 S20 S19 S18 S15 S14 S17 S21 S22 S27 S28 S25 Page 5.2Nothing display on screen (screen is black, color of LED is blue) 24 5.Troubleshooting (continued) 5.2Nothing display on screen (screen is black, color of LED is blue)continued 25 5.3Checking the back light unit 26 5.Troubleshooting (continued) 5.4Abnormal screen for VGA 27 5.5Abnormal screen (For DVI and the same for HDMI) 28 5.Troubleshooting (continued) Page 5.7Abnormal plug and play operation for VGA 30 5.Troubleshooting (continued) 5.8Abnormal plug and play operation (For DVI and the same for HDMI) 31 5.9.2Checking the control circuit of vertical sync pulse 32 5.Troubleshooting (continued) ACERH233H 5.10Checking the resolution change IC movement 33 5.11Checking the DC/DC converter circuit 34 5.Troubleshooting (continued) Page Page cedid Page Page ACER H233H Block digram _8.2 SCHEMATICS POWER BOARDACER_LCD_H233H_ GND2- 41 23 6832209800P01 AIN L_ AOUT R_ AOUT L_ AIN R_ TO263 TO252 GND VSS JWTA2001WV2 12-- 13 _8.4 SCHEMATICS INTERFACE_BD_VGA & DDC INPUTACER_LCD_H233H_ D SUB 15P-_ 16 17 43 1234567 8910111213 _8.5 INTERFACE_DVI& DDC INTERFACEACER_LCD_H233H SCHEMATICS_ DVI D 24P-_ 1234567 8910111213 44 _8.6 INTERFACE_BD_HDMIACER_LCD_H233H SCHEMATICS_ R353 4K7 5_% HDMI 19P_ R354 10K 5_% R352 4K7 5_% _8.7 INTERFACE_BD_SCALER/RTD2482DACER_LCD_H233H SCHEMATICS_ Shielding INL GND INR NCA POINT6PIN/- KEY1 AFN300 N2G11 P TWO-_- A POINT 6PIN- KEY1 _8.9 SCHEMATICS _BDOSD KEYACER_LCD_H233H_ 1 25 6PINfor FFC G LED ORANGE_ LED WHITE_ POWER KEY B O