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Acer P203 P203W LCD Service Guide - Page 24

Checking the back light unit

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5.3 Checking the back light unit 5. Troubleshooting (continued) ACER P203W 23 Go to cover page Is +22V supplied to inverter PWB ? (by the power board) NG OK Failure Point Power board of Inverter part failure. Check the BKLT_EN signal of the DC input P301 pin2 at TTL high level. NG OK Failure Point 1) printed wire broke between P301 pin2, 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) Back light unit of LCD module is failure. 2) Inverter Cable is disconnected Failure Point 1) printed wire broke between P301 pin3, R301 and I305 pin86. 2) I305 is failure.

Section	Page
Cover page	1
1. Product Specification	3
1.1 SCOPE	3
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	12
4. Assembly and Disassembly Procedures	13
4.1 Assembly procedures:	13
4.2 Disassembly procedures	17
5. Troubleshooting	21
5.1 No.display of screen (Screen is black, color of LED isamber)	21
5.2 Nothing display on screen (screen is black, color of LED isblue)	22
5.3 Checking the back light unit	24
5.4 Abnormal screen for VGA	25
5.5 Abnormal screen (For the DVI)	25
5.6 Abnormal OSM display adjust problem	27
5.7 Abnormal plug and play operation for VGA	28
5.8 Abnormal plug and play operation (For the DVI)	29
5.9 Checking the interface circuit of sync signal	30
5.10 Checking the resolution change IC movement	31
5.11 Checking the DC/DC converter circuit	32
6. Schematics and Layouts:	33
6.1 ACER_LCD_P203W_SCHEMATICS_BLOCK DIAGRAM	33
6.2 ACER_LCD_P203W_SCHEMATICS_POWER BOARD	34
6.3 ACER _ _LCD_P203W SCHEMATICS_INTERFACE_TOP	34
6.4 ACER_LCD_P203W_SCHEMATICS_INTERFACE POWER	35
6.5 ACER_LCD_P203W_SCHEMATICS_INTERFACE BD_VGA & DDC INTERFACE	37
6.6 ACER_LCD_P203W_SCHEMATICS_INTERFACE BD_DVI & DDC INTERFACE	38
6.7 ACER_LCD_P203W_SCHEMATICS_INTERFACE BD_SCALER_GM5726H	38
6.8 ACER_LCD_P203W_SCHEMATICS_INTERFACE BD_KEY & PANEL INTERFACE	39
6.9 ACER_LCD_P203W_SCHEMATICS_FUNCTION _KEY	41
6.10 ACER_LCD_P203W _LAYOUTS_POWER BOARD	42
6.11 ACER_LCD_P203W LAYOUTS__ YOUTS_INTERFACE BOARD	43

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