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Acer X193 X183H / X193HQ Service Guide - Page 23

Troubleshooting continued

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Page 23 highlights

22 ACER X193HQ Go to cover page 5.3 Checking the back light unit 5. Troubleshooting (continued) Is +22V supplied to inverter PWB ? (by the power board) NG OK Failure Point 1) Power board of Inverter part failure. Check the BKLT_EN signal of the DC input P301 pin 1 at TTL high level. NG OK Failure Point 1) printed wire broke between P301 pin1, R303 and I305 pin 88. 2) I305 is failure. Check the BKLT_ADJ signal of the input P301 pin3 from I305 pin86 is a PWM signal. NG OK Failure Point 1) printed wire broke between P301 pin3, R304,R357 and I305 pin11. 2) Q302 is failure. Failure Point 1) Back light unit of LCD module is failure. 2) Inverter Cable disconnect

Section	Page
Cover	1
Important Safety Notice	2
1. Product Specification	2
1.1 SCOPE	2
1.2 GENERAL REQUIREMENTS	3
1.3 ELECTRICAL	3
1.4 PANEL ELECTRICAL	7
1.5 Optical Characteristics	8
2 OSD Menu	9
2.1 MAIN OSD MENU	9
3. Exploded Diagram	11
3.1 Packing Exploded Diagram	11
3.2 Product Exploded Diagram	11
4. Assembly and Disassembly Procedures	12
4.1 Assembly procedures:	12
4.2 Disassembly procedures	16
5. Troubleshooting	20
5.1 No display on the screen (Screen is black and colour of LED is amber.)	20
5.2 Nothing displays on the screen (Screen is black and colour of LED is blue.)	21
5.3 Checking the back light unit	22
5.4 Abnormal screen for VGA	23
5.5 Abnormal screen (For the DVI)	25
5.6 Abnormal OSM display adjust problem	25
5.7 Abnormal plug and play operation for VGA	27
5.8 Abnormal plug and play operation (For the DVI)	28
5.9 Checking the interface circuit of sync signal	29
5.10 Checking the resolution change IC movement	30
5.11 Checking the DC/DC converter circuit	31
6. Firmware Upgrade Process	32
6.1 Hardware Configuration	32
6.2 Realtek F/W Configuration:	32
7. Writing EDID Process	34

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