LiteOn B17AAU Service Manual Download Page 10 | Manualshive

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LiteOn B17AAU Service Manual Download Page 10

Page 7

Circuit Description

B17AAU / B17ANU / B17AAY

8.7 Power OFF sequence

When the POWER switch is pressed while the power supply is ON, the POWER ON signal is turned H. When

this H potential is detected, the CPU begins to turn off the respective power supplies according to the sequence
shown below.

POWER

LED

LVCC

(Audio_EN)

Panel_VCC

PCLK/DATA

Backlight_EN

«
...
8
9
10
11
12
...
»

Summary of Contents for B17AAU

Page 1: ...17 inch LCD Monitor B17AAU B17ANU B17AAY Service Manual...

Page 2: ...lectronic or machine readable form without prior written permission of LiteOn Technology Corp B17AAU B17ANU B17AAYService Manual Printed in Taiwan Trademarks LiteOn isa registered trademark of LiteOn...

Page 3: ...it 1 5 System reset LED control circuit 1 6 E2 PROM for PNP 1 7 E2 PROM 2 8 CPU circuit 2 8 1 Dection of POWER switch status 2 8 2 Display mode identification 2 8 3 User control 4 8 4 Control of ident...

Page 4: ...5V source Q307 I321 ON OFF control for LCD Module ON OFF control is performed for power ON OFF and also for the power saving sequence 3 Video input circuit Circuit diagram MAIN PWB 3 8 The analog vid...

Page 5: ...1 Display mode identification l The display mode of input signal is identified based on Table 1 l When the mode has been identified through the measurement of horizontal and vertical frequencies the...

Page 6: ...7 86 31 5 5 VESA 640 X 480 75Hz 37 5 31 5 6 VESA 800 x 600 56Hz 35 16 36 7 VESA 800 x 600 60Hz 37 88 40 8 VESA 800 x 600 75Hz 46 88 49 5 9 VESA 800 x 600 72Hz 48 08 50 10 MAC 832 x 624 75Hz 49 72 57 2...

Page 7: ...NE 1031 16 1280 x 960 960 LINE 1027 17 1280 x 1024 1027 LINE 14 15 8 3 2 Functions Control is effected for the push switches to be used when the user changes the parameters in order to modify the resp...

Page 8: ...ame Function P3 5 17 I IICCLK IIC bus clock P3 4 16 I O IICDATA IIC bus data 8 5 2 I2 C controlled functions The following functional controls are effected by I2 C 1 Control of EEPROM I305f for parame...

Page 9: ...sequence When the POWER switch is pressed the POWER OFF signal is turned H When this H potential is detected the CPU begins to establish the respective power supplies according to the sequence shown b...

Page 10: ...the POWER switch is pressed while the power supply is ON the POWER ON signal is turned H When this H potential is detected the CPU begins to turn off the respective power supplies according to the se...

Page 11: ...Receive data NC P3 1 TXD H Transmit data P3 2 IRQ gm5020 interrupt signal P3 3 PWR_SW ON OFF monitor power P3 4 SDA H IIC Bus Data P3 5 SCL IIC Bus Data Active L P3 6 NC P3 7 DDC_GND L Detect Dsub ca...

Page 12: ...f output voltage 5V goes up the R terminal of I803 gets more bias accordingly photo Regulation If output voltage 5V goes up the R terminal of I803 gets more bias accordingly photo Regulation If output...

Page 13: ...8 5 1 NO OSM display 8 5 2 OSD Adjust problem 8 6 Abnormal plug and play operation 9 6 1 Abnormal DDC2 9 7 Checking the interface circuit of sync signal 10 7 1 Checking the control circuit of horizont...

Page 14: ...rom Computer is output and if the video cable is connected normally No Preceed No OSM display section OK Proceed Checking the resolution change IC movement section NG Input the sync signal of computer...

Page 15: ...enu is displayed on screen when you push the PROCEED key NG 1 Change pattern of video signal output on the host 2 Reconnect the video cable 3 Change the video cable Check the video cable for failure C...

Page 16: ...ot clock being outputted under the condition that a LCD module is connected to L322 pin 2 OK NG Failure point 1 I315 failure 2 Printed wire broke between I315 and L322 pin 2 Check the H sync pulse of...

Page 17: ...failure 2 Printed wire broke between I315 and RN314 pin 6 Check the data signal output on I315 R G B data pin OK NG Failure point 1 I315 failure Failure point 1 The cable broke between P304 and LCD mo...

Page 18: ...TTL high level OK NG Is a H level being output in the TTL level from I302 pin 29 Or is BKLT_EN signal of the rectangle being output NG Failure point Printed wire broke between I302 pin 29 and R326 Che...

Page 19: ...e broke between I315 data line and I319 I320 2 I315 failure Check the negative horizontal sync pulse output to RN314 pin 8 from I315 pin F20 at TTL level OK NG Failure point 1 Printed wire broke betwe...

Page 20: ...ge 7 B17AAU B17ANU B17AAY OK NG Continue Check I319 I320 all LVDS signal pins Process Checking the resolution change IC movement section Failure point 1 I319 I320 faulure 2 Printed wire broken between...

Page 21: ...I315 pin P1 and I302 pin 6 7 RN301 RN303 open short Proceed Checking the resolution change IC movement section 5 1 NO OSM display 5 2 OSD Adjust problem OK NG Check the input TTL level whether was ch...

Page 22: ...ut of serial data on I312 pin 6 synchronize SCLK at TTL level OK NG Failure point I312 failure Failure point 1 The host machine isn t communicating in DDC2 mode 2 The video cable may have failed or ma...

Page 23: ...rinted wire broke between P304 pin 13 and I315 pin L2 3 FB305 R329 open 4 R330 C352 short Process Checking the resolution change IC movement section Check the vertical sync signal on I315 pin K1 TTL l...

Page 24: ...e point Print wire broke between X303 pin 5 and I315 pin J4 OK NG Failure point Print wire broke between and X303 pin 8 and power supply Failure point X303 failure Is 5 0V supplied to I315 pin T1 at H...

Page 25: ...Page 12 Trouble Shooting B17AAU B17ANU B17AAY 9 No power on Check the 5V power is supplied from power board OK NG Failure point Power board failure Proceed Checking the operation of CPU...

Page 26: ...the output of 3 3V line voltage from I323 pin 2 Printed wire broke between P310 pin 7 8 and I323 pin 3 OK NG Is the output FB335 being inputted to I315 pin 3 OK NG Failure point Printed wire broke bet...

Page 27: ...t Printed wire broke between output of FB331 and I302 power supply pin Is 24MHz clock input to I302 pin 20 and 21 at TTL level OK NG Failure point X301 failure Check the input of 5V H pulse from I302...

Page 28: ...nd repair them Check C807 is over 10V or not Yes No Check R805 R803 I801 and repair them Check pin 6 of I801 have same pulse or not Yes No Check peripheral components of I801 and repair them Check pin...

Page 29: ...6444006108 IC MOS M51953AFP 8P SOP 6 I302 6448015548 IC CPU PROM P87C51RD IA 44P PL 7 I305 6448016508 IC 24LC16B SN 8P SOP 8 I312 6448018208 IC 24LC02B 8PIN SOP MICROCHIP 9 I315 6444007608 IC CMOS gm5...

Page 30: ......

Page 31: ...LITE ON TECHNOLOGY CORP 5 F No 16 Sec 4 Nanking E Road Taipei Taiwan Tel 886 2 25706999 Fax 886 2 25706888 URL www liteontc com tw Printed in Taiwan...

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