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Acer AL1716 AL1716W Service Guide - Page 21

Abnormal plug and play for VGA, Troubleshooting continued

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20 ACER AL1716W Go to cover page 4.7 Abnormal plug and play for VGA 4. Troubleshooting (continued) Confirm the host computer supplies DDC2 mode. OK NG Failure Point: The host computer is not communicating in DDC2 mode. Check the voltage on P302 pin10 that is power DC 5V. NG Failure Point: The VGA video cable is defected. OK Check the voltage on I304 pin8 that is power DC 5V. Failure Point: NG 1. Printed wire is broken between P302 pin9 and I304 pin8 2. D307 or D308 is damaged. OK Check the voltage on P302 pin12, pin15 that are serial data and clock signal. Failure Point: NG The VGA video cable is damaged. If I304 pin5, pin6 LOW, the I304 may be failure. OK Check the output signal of serial data and clock signal I304 pin5 and pin6 NG Failure Point: I304 is defected. OK Failure Point: 1. R328, R329, R326, R327 is open. 2. D309, D310 is short. 3. C331, C332 is short.

Section	Page
Cover Page	1
Important Safety Notice	2
1. Product Specification	3
1.1 Scope	3
1.2 General Requirements	3
1.3 Interface Connectors	4
1.4 Input Signals (Analog RGB Signal Input)	4
1.5 User Controls and Indicators	5
1.6 Monitor Modes and Timing Capability	6
1.7 Controller Requirements	7
1.8 DC - AC Inverter Requirements	7
1.9 Power Supply Requirements	7
1.10 Display Communications Channel	7
2. Flat Panel Specification	8
2.1 General Information	8
2.2 Panel Timings	8
2.3 Polarizer Hardness	8
2.4 Backlight Requirements	8
2.5 Defects	8
2.6 Optical Characteristics	9
2.7 Panel General Information	10
2.8 Back-Light Unit	12
2.9 Switching Characteristics for LVDS Receiver	12
3. Exploded Diagram	13
3.1 Packing Exploded Diagram	13
3.2 Product Exploded Diagram	14
4. Troubleshooting	14
4.1 Power board	15
4.2 Inverter circuit on power board	16
4.3 No.display of screen(Screen is black, color of LED is amber)	17
4.4 Nothing display on screen (screen is black, color of LED is blue)	18
4.5 Abnormal screen for VGA source	19
4.6 Abnormal OSM display adjust problem	20
4.7 Abnormal plug and play for VGA	21
4.8 Checking the control circuit of vertical sync pulse for VGA	22
4.9 Checking the resolution change IC movement	23
5. Spare Parts List	24
6. Schematics and Layouts	32
6.1 ACER_LCD_AL1716W_SCHEMATICS_POWER BOARD	32
6.2 ACER_LCD_AL1716W_SCHEMATICS_INTERFACE_TOP	33
6.3 ACER_LCD_AL1716W_SCHEMATICS_INTERFACE POWER	34
6.4 ACER_LCD_AL1716W_SCHEMATICS_INTERFACE BD_VGA & DDC INTERFACE	35
6.5 ACER_LCD_AL1716W_SCHEMATICS_INTERFACE BD_DVI & DDC INTERFACE	36
6.6 ACER_LCD_AL1716W_SCHEMATICS_INTERFACE BD_SCALER_GM5726H	37
6.7 ACER_LCD_AL1716W_SCHEMATICS_INTERFACE BD_KEY & PANEL INTERFACE	38
6.8 ACER_LCD_AL1716W_SCHEMATICS_INTERFACE BD_AUDIO	39
6.9 ACER_LCD_AL1716W_LAYOUTS_POWER BOARD	40
6.10 ACER_LCD_AL1716W_LAYOUTS_INTERFACE BOARD	41
7. Assembly and Disassembly Procedures	42
7.1 Assembly Procedures	42

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