Acer MB243WABNS

5.Troubleshooting (continued)

5.7 Checking the interface circuit of sync signal

5.7.1Checking the control circuit of horizontal sync pulse

5.7.2Checking the control circuit of vertical sync pulse

Checkthe horizontal

syncsignal on I314 pin46

TTLlevel

FailurePoint

1. Videocable is defected.

2. Printedwire is broken between P304 pin13 and I 314 pin46.

3. FB305,R364, R363 is open.

4. R371,C336, D305 is short.

5. I311is defected.

Proceedto“5.8Checkingthe

resolutionchange IC movement”

section

Checkthe vertical sync

signalon I314 pin47 TTL level

FailurePoint

1. Videocable is defected.

2. Printedwire is broken between P314 pin14 andI314 pin47.

3. FB306,R368, R369 is open or more than one component .

4. R370,C335, D303 is short.

5. I311is defected.

Proceedto “5.8 Checking the resolution

changeIC movement” section

Go to cover page

ACERG24

Contents

Main Service Service Manual Model ID:MB243WABNS ACER ACER_LCD_G24_SM080519V1 Page Page . Function LED Color Full Power Bluecolor Sleep Orange color Table 1 Page . Page Page Page Page Page S4 S1 S6 S3 S5 S11 S10 S9 S7 S8 S18 Takea key function board to hook with front bezeland connect to key function cable. S15 S13 S14 Page S6 S5 S3 S4 S2 S8 S9 S11 S10 S17 S16 S13 S15 S12 S18 S19 S22 S23 S20 Page 5.2 Nothing displays on the screen (Screen is black and colour of LED is blue.) 21 5.3 Checkthe backlight unit 22 5.4 AbnormalScreen: 23 ACERG24 Page Page Page 5.8 Checking the resolution change IC movement 27 Page 5.10Checking the inverter board circuit 29 5.11HDMI signal check 5.11.1No video 30 5.Troubleshooting (continued) Page Page cedid Page Page _8.2 SCHEMATICS POWER BOARDACER_LCD_G24_ 6832194100P01 20. 36 8.3 ACER __LCD_G24 SCHEMATICS_INTERFACE_BD_POWER OFF FOR POWER SAVING CONTROL SOT223- HI POWERON==> TO263- TO252 GOI-- TO263- _8.4 SCHEMATICS INTERFACE_BD_MCU AND FUNCTION KEYACER_LCD_G24_ LEDB ACTIVELOW_ TP28 TP433 VCCGND DSUB _8.5 INTERFACE_BD_ACER_LCD_G24 SCHEMATICS_ VGA INPUT Connector 39 _8.6 INTERFACE_BD_HDMIAND DVI INPUTACER_LCD_G24 SCHEMATICS_ Connector TP483 TP491 TP490 _8.7 INTERFACE_BD_SCALERACER_LCD_G24 SCHEMATICS_ FPCFFC 30S 100C--- MST9259D 41 _8.8 SCHEMATICS INTERFACE_BD_SDRAMACER_LCD_G24_ 42 _8.9 SCHEMATICS INTERFACE_BD_USB AND CAM/MIC OUTPUTACER_LCD_G24_ Downstream2 Downstream4 Downstream3 Downstream2 HDMI AUDIO CODEC deleted for( P243W HDMI model) 1234567 8910111213 1 2 _8.11 SCHEMATICS INVERTERBDACER_LCD_G24_ 6832188000P0 ONOFF- DS OZ9982