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Service Manual 17-inch LCD Monitor AL1702...
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This manual may not, in whole or in part, be copied, photocopied, reproduced, translated, or converted to any electronic or machine readable form without prior written permission of LiteOn Technology Corp. ACER AL1702 Service Manual. Printed in Taiwan. R e vis ion O riginal release Trademarks LiteOn is a registered trademark of LiteOn Technology Corp.
No display of screen (Screen is black, color of LED is amber) -------------------------------------------------------- 11 Nothing displays on screen (Screen is black, color of LED is green) ------------------------------------------------ 12 Checking the back light unit ----------------------------------------------------------------------------------------------- 15 Abnormal screen------------------------------------------------------------------------------------------------------------- 16 AL1702 Page 1...
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Checking the resolution change IC movement -------------------------------------------------------------------------- 20 Checking the DC/DC converter circuit ----------------------------------------------------------------------------------- 21 10. Checking the Audio circuit [option] -------------------------------------------------------------------------------------- 22 11. Checking inverter board circuit -------------------------------------------------------------------------------------------- 23 12. Power board ------------------------------------------------------------------------------------------------------------------ 24 3) Spare Parts Recommended Spare Parts List ------------------------------------------------------------------------------------------------- 25 Page 2 AL1702...
1.7.5 SCP : If output terminal is short to ground, photo transistor does not conduct, hence Q806 does not conduct either. Then oscillation of I801 is stop, shutting Q803 off immediately. Line Filter Power Board Block Diagram Rec. & Power Filter Transformer Driver AL1702 Outpur Rec. & Filter Page 3...
R116 will be at 1.25V. Regulator ON / OFF U.V.P. Brightness control Page 4 Inverter Circuit Block Diagram Control IC : OZ960 Full-bridge switching Enable Output driver Protection Ignition Dimming Regulation control AL1702 Lamp Transformer Detection Feed back...
3.5.2 MCU (Circuit diagrams MAIN PWB 7 of 8) The I307 MCU is system processor. It can programmed scaler, control power save sequence for the system, input keypad function, output LED, control audio function, and ISP / DDC2Bi function. AL1702 Page 5...
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Page 6 Function Remarks Soft power switch input Power key Exit/Enter switch input Enter / withdraw from Down key ↓ switch input - / Mute key ← switch input + / Auto key → switch input AL1702...
If there is no horizontal sync signal input. If there is no vertical sync signal input. If the horizontal sync signal is outside the measuring range of MST8111B. If the vertical sync signal is outside the measuring range of MST8111B. AL1702 Page 7...
UART interface data OUT Interrupt signal from the scaler EEPROM data bus EEPROM clock bus DDC EEPROM write protection VGA cable connected Panel power enable Back light power enable Audio power enable Audio mute enable Backlight brightness control Audio volume control AL1702...
Check if the sync signal from computer is output and if the video cable is connected normally. Proceed "checking the resolution change IC movement" section. AL1702 Proceed "No OSM display" section. Input the sync signal of computer, or change the cable. Page 11...
1)Change pattern of video signal output on the host. 2)Rsconnect the video cable. 3)Change the video cable. Check if the LCD video signal cable is connected between the MAIN PWB and LCD module. Next Page AL1702 Failure Point The cable is disconnected.
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I302 is failure Check if the voltage on I302 pin3 that is power DC at 5V. Failure Point 1) Printed wire broke between P301 pin1, 2 and I302. 2) Check power board. Failure Point I302 is failure AL1702 Page 13...
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Q303 pin2 at TTL high Failure Point 1) Printed wire broke between Q303 pin 2 and I307 pin9. 2) I307 is failure. AL1702 level. Failure Point 1) Prined wire broke between Q303 pin 3, R309, R308 and I312 pin1.
Failure Point 1) printed wire broke between P301 pin6, R306 and I307pin 31. 2) I307 is failure. signal. Failure Point 1) printed wire broke between P301 pin5, Q301, Q302 and I305 pin73. 2) I305 is failure. AL1702 Page 15...
1)Printed wire broke between P302 pin 9 and I305 pin63. 2) Video cable is failure. 3) R322 is short or open. 4) R318 is short or open. 5) C332 is short or open. Failure Point Printed wire broke between I305 and P305. AL1702...
2) Printed wire broke between P308 pin4 and I307 pin2. 3) Printed wire broke between P308 pin5 and I307 pin1. 4) Printed wire broke between P308 pin6 and I307 pin42. 5) C404, C405, C406, C407 is short. 6) R367, R368, R369, R370 is short or open. AL1702 Page 17...
TheVideo cable is failure. Failure Point 1) Printed wire broke between I304 pin8, D309, D310 and P302 pin13. 2) D309 or D310 is failure. 3) D315 is failure. Failure Point TheVideo cable is failure. Failure Point I304 is failure. AL1702...
Failure Point 1) Prined wire broke between I307 pin33 and I311 pin12. 2) C414 short. 3) I307 failure. Failure Point 1) Speaker failure. 2) Prined wire broke between I311 pin14, 17 and P310. 3) C415, C418 open or short. AL1702...
It is not inverter problem. Check Q106, Q102 and repair them. right. Check CCFL and repair them. Check R128 and repair it. pulse. Check C115, R108, I101 and repair them. Repair I101. Check C128/C129/C132/D115/ D114/C118 and repair them. Repair them. AL1702 Page 23...