Specifications

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ACER AL708 Lcd

WARNING A

SAFETY PRECAUTIONS B

DIMENSIONS 1

GENERAL INFORMATION 2

SPECIFICATIONS 3

THEORY OF OPERATION 4

DISASSEMBLY INSTRUCTIONS 5

CONTROL LOCATION 6

NECESSARY EQUIPMENT LIST 7

BLOCK DIAGRAM 8

CONDUCTOR VIEW 9

SCHEMATIC DIAGRAM 10

TROUBLE SHOOTING HINTS 11

REPLACEMENT PARTS LIST 12

SPARE PARTS LIST 13

L7EA (AL708)

Summary of content (36 pages)

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ACER WARNING SAFETY PRECAUTIONS DIMENSIONS GENERAL INFORMATION SPECIFICATIONS THEORY OF OPERATION DISASSEMBLY INSTRUCTIONS CONTROL LOCATION NECESSARY EQUIPMENT LIST BLOCK DIAGRAM CONDUCTOR VIEW SCHEMATIC DIAGRAM TROUBLE SHOOTING HINTS REPLACEMENT PARTS LIST SPARE PARTS LIST L7EA (AL708) AL708 Lcd A B 1 2 3 4 5 6 7 8 9 10 11 12 13
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SAFETY PRECAUTIONS 1. CAUTION: No modification of any circuit should be attempted. Service work should only be performed after you are throughly familiar with all of the following safety checks and servicing guide lines. 2. SAFETY CHECK Care should be taken while servicing this LCD display. Because of the high voltage used in the inverter circuit. These voltage are exposed in such areas as the associated transfomer circuits. 3.
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2. GENERAL INFORMATION 1. OUTLINE This monitor is 17" multi-scan color LCD display with the following features. OSD ( on screen display ) control allows easy user adjustment. Power saving function, which helps saving energy , is also one of the highlights of this model. 2.8 Superior display performance High contrast : 350 : 1 High brightness : 250 cd / m2 (Typical) Wide view angle : 140 / 100 degrees (H/V) 2.9 Special function VESA DDC2B ( Display Data Channel ) Compatible 2. FEATURES 2.
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3. SPECIFICATION 1. Outline 1.1 POWER SW, LED,UP.DN,LEFT,RIGHT,SEL and MENU key are located on the front panel. 1.2 Video signal connector, audio line-in receptacle and DC-IN are located on the back side of the cabinet. 1.3 OSD menu includes the following function. CONTRAST BRIGHTNESS H.POSITION V.POSITION COLOR-TEMPERATURE CLOCK PHASE LANGUAGE VOLUME POWER-ON-RECALL 1.4 CONTRAST and BRIGHTNESS can be directly controlled with UP / DN key. 1.5 VOLUME can be controlled with LEFT / RIGHT key. 4.
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5. ELECTRICAL SPECIFICATIONS 5.1 Standard conditions Display area 338 x 270 mm Video signal level 0.7 Vpp Contrast Max. Brightness Max. Ambient 20 +/- 5 C degrees Input voltage AC 120,60Hz Warming up time Display mode Fv Fh # mode Resolution Hz (KHz) 1 IBM VGA 720 x 400 70 31.46 2 VESA 640 x 480 60 31.46 3 MAC 13” 640 x 480 67 35 4 VESA 640 x 480 72 37.86 5 VESA 640 x 480 75 37 5 > 30 minutes 6 VESA 800 x 600 56 35.
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5.6 Display Area Display area : 338 x 270 mm 5.7 General performance 5.7.1 Maximum pixel clock 135 MHz 5.7.2 Maximum luminance Value Conditions 250 cd / m2 at center of the display area ,Specified by 6500K + 8 MPCD Display image : Full white Brightness : Maximum Contrast : Maximum 5.7.3 Brightness variation Value Conditions 75 % Variation = C / A x 100 Display image: Full white Brightness : Maximum Contrast : Maximum A: Luminance at center position C: Luminance at position of lowest brightness 6.
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4. THEORY OF OPERATION This section describes the function of the LCD monitor per functional block. L7EA monitor includes MB board, audio board (option), inverter board, adapter and button board. 4.1 MB BOARD The MB board is a four-layer, single-landed design with ground and internal planes provided. DC power from the power adapter enter the board through DC jack. Other connectors on the board are for inverter, audio and button board .
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Pin Number Pin Name Pin Usage 40 GPIO0 / PWM0 Backlight control 41 GPIO1 / PWM1 Volume control 42 GPIO2 / PWM2 Key-Left 43 GPIO3 / TIMER Key-Up 44 GPIO4 / UART_DI Debug Purpose 45 GPIO5 / UART_DO Debug Purpose 46 GPIO6 Key-Right 47 GPIO7 Key-Down 39 GPIO8 / IRQINn LED-Orange 48 GPIO9 Key-Sel 49 GPIO10 Key-Menu 50 GPIO11 No use 51 GPIO12 NV- RAM (U4) SDA 52 GPIO13 NV- RAM (U4) SCL 205 GPIO16 / HFSn NV- RAM (U11) SCL 1 GPIO17 No use 208 GPIO18 No use 207
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4.1.3 Power Regulator AIC1563 (U12),LT1117 (U5, U6) The AIC1563 is a monolithic control IC containing the primary functions required for DC to DC converters. The device consists of an internal temperature compensated reference, conparator, controlled duty cycle oscillator with an active current sense circuit. Desired output voltage are determined by the equation Vout = 1.25 ( 1 + R104 / R103), In this case, the output voltage are 5 Volts.
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4.4 Adapter This is a general purpose AC / DC adapter which converter 90~240 Vac to a stabilized DC voltage 12 V with rated output current of 4.16A . Electrical specification describled as below. INPUT OUTPUT Rated Input Voltage 90~240 Vac , 50/60 Hz Operation Input Voltage 90~260 Vac, 47~63 Hz Input Current < 1.5A Inrush Current (Cold Start) < 100A @ 120Vac Standby Input Power < 1.
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5. DISASSEMBLY INSTRUCTIONS 1. Stand& rear cover removal 1) remove four large screw "1" from the rear cover 2) remove the rear cover 3) remove four screw "2" 4) remove the stand 1 1 1 2 2 2 2 2. ESD cover removal 1) remove four screw "3" 2) remove the ESD cover 1 3 3 3 3 3.
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4. Inverter board removal 1) remove two screw "5" 2) remove the Inverter board 5 5 6. Panel module removal 1) remove four screw "6" 2) remove the Panel module 6 6 6 6 7.
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6. CONTROL LOCATION MENU ↓ ↑ ← → Sel Power Selected or change function To increase level of selected item To decrease level of selected To power on and off the display power status indicator ( LED ) 1)To step up the parameter 2) volume 1)To step down the parameter 2) volume To display main menu or off Examples of on-screen operation A. Brightness / Contrast Adjustment Brightness. Press the △ and ▽ buttons to adjust the brightness of the screen.
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Vertical position. Press the △ and ▽ buttons to move image up and down. Horizontal position. Press the ＜l and l＞ button to move image left and right. The Auto function configures the vertical and horizontal position for you. Language. Press the ＜l and l＞ buttons to change the OSD language display setting.
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Audio board Button board L7EA (AL708)
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10. SCHEMATIC DIAGRAM~1 VGA_5V +5V HFSn HCLK Input connector 4 4 DAN202U D9 2 3 VGA INPUT CONNECTOR R100 47K/6 R106 100/6 13 14 8 7 6 5 VGA_SCL 15 R102 100/6 1 6 2 7 3 8 4 9 5 10 DB15HD 17 C131 0.01u/6 100/6 C130 0.01u/6 R91 100/6 C114 0.01u/6 R88 100/6 C112 0.01u/6 R86 100/6 C109 0.01u/6 R77 100/6 C105 0.01u/6 RED+ 4 RED- 4 GREEN+ 4 GREEN- 4 BLUE+ 4 D4 D3 BLUE- 4 5.6V 5.
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10. SCHEMATIC DIAGRAM~2 Scaler gm2120 3.3V_DVDD 3.3V_DVDD C93 C76 C78 22u/25V 0.1u/6 0.1u/6 0.1u/6 0.1u/6 0.1u/6 0.1u/6 0.1u/6 0.1u/6 0.1u/6 0.1u/6 3.3V_AVDD U8 141 146 150 173 181 187 193 196 164 168 172 160 GND +3.3V 3.3V_AVDD L11 CX000800000/1206 C80 C101 C118 C100 C120 C103 C117 C119 22u/25V 0.1u/6 0.1u/6 0.1u/6 0.1u/6 0.1u/6 0.1u/6 0.1u/6 AVDD_DDDS AVDD_SDDS AVDD_RPLL RESERVED RESERVED RESERVED RESERVED RESERVED 3.
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10. SCHEMATIC DIAGRAM~3 3.3V_DVDD 4 3 2 1 R33 4 3 2 1 R34 R140 R141 12V 10K/6 10K/6 10K/6 10K/6 1 RN13 5 6 10K 7 8 3.3V_DVDD 3.
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4 R18 PPWR 0/6 +3.3V DARED0 DARED1 DARED2 DARED3 DARED4 DARED5 DARED6 DARED7 5 DABLU[0..7] 2 Q3 DTC144EUA/NS DABLU0 DABLU1 DABLU2 DABLU3 DABLU4 DABLU5 DABLU6 DABLU7 5 DAGRN[0..7] GND DAGRN0 DAGRN1 DAGRN2 DAGRN3 DAGRN4 DAGRN5 DAGRN6 DAGRN7 DCLK 5 5 50 2 51 52 54 55 56 3 DAGRN6 DAGRN7 DAGRN0 DAGRN1 DAGRN2 DAGRN3 DAGRN4 DAGRN5 8 10 4 6 7 11 12 14 DABLU6 DABLU7 DABLU0 DABLU1 DABLU2 DABLU3 DABLU4 DABLU5 16 18 15 19 20 22 23 24 DHS DVS DEN 25 27 28 30 DISP_CLK 31 C14 C15 C16 0.1u/6 0.
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D6 1 1SS355 2 C151 1u/8 U12 5 6 7 8 12V 4 1SS355 240K/6 1% Q9 GND MMST3906 +5V R112 1K/6 3K/6 1% L16 C138 2 1 R103 2 1 1K/6 1% 2200p/6 L14 1 47UH D8 RB081L-20 C134 1 R104 C149 0.1u/6 R108 120p/6 GND GND GND NDS9410A/SO D7 330K/6 C146 AIC1563 0.1u/8 Q13 47/6 R111 1n/6 C136 CX000800000/1206 C128 0.1u/6 1000u/6.3V 2 CF GND R117 1 C142 VCC FB 1 2 3 2 2 330u/16V C153 330u/16V 5 DE 2 C140 C143 0.
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CN1 4401-10-10P-R 1 3 SW1 2 4 POWER HDK632A 1 3 SW2 2 4 SELSE HDK632A 1 3 SW3 2 4 RIGH HDK632A 1 3 SW4 2 4 UP HDK632A 1 3 SW5 2 4 DOWN HDK632A 1 3 SW6 2 4 LEFT orange A2 HDK632A C LED1 EL-209-2EGW 1 3 A1 green SW7 2 4 MENU HDK632A 10. SCHEMATIC DIAGRAM~6 2 3 4 5 H1 1 9 8 7 6 MTH276D126 2 3 4 5 H2 1 9 8 7 6 MTH276D126 Button board L7EA (AL708) 10-6 PROJECT : L7E Quanta Computer Inc.
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10.
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11. TROUBLE SHOOTING HINTS 1. No Power 2.
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3.
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12. REPLACEMENT PARTS LIST~1 Audio board Symbol CN1 CN2 CN3 L1 L2,L3 R12,R13 R6,R7,R10 R9 R1,R2 R3,R4,R5,R8 C4,C5 C1 C6,C7 C8,C9 C2,C3 Q1 U1 PARTS NO. Descripition DFHD03MR065 CONN DIP HEADER 3P 1R MR(P1.5,H4.1) DFHD04MR124 CONN DIP HEADER 4P 1R MR(P2.0,H4.1) DFHD07MR047 CONN DIP HEADER 7P 1R MR(P2.0,H4.1) CX0P121R000 EMI FILTER CHIP HI1206P121R-00(120 6A) CX601T02001 EMI FILTER CHIP N2012Z601T02(0.
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13.
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R131 R36 R30 R124 RN1,RN2,RN3,RN4,RN5 RN6,RN7,RN8,RN9,RN10 RN11,RN12,RN15,RN16,RN17 RN18,RN19,RN20 RN13,RN14 C11,C72,C151,C195 C13,C14,C15,C16,C17 C18,C19,C20,C22,C42 C43,C73,C74,C75,C76 C78,C82,C88,C93,C95 C96,C97,C98,C100,C101 C103,C106,C108,C110,C111 C117,C118,C119,C120,C121 C126,C136,C144,C149,C155 C156,C182,C185,C186,C187 C188,C189,C190 C138 C134 C21,C142,C143,C194 C1,C2,C3,C4,C105 C109,C112,C114,C130,C131 C146 C102,C107 C99,C104 C84,C91 C9 C113,C116,C129,C132,C135 C137,C139,C141,C145,C154 C184,C196,C1
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C164,C165,C166,C167,C168 C169,C170,C171,C172,C173 C174,C175,C176,C177,C178 C179,C180,C181 C5,C6,C7,C8,C40 C69,C80,C94 C68,C70,C90,C92 C128 C23,C140,C153,C183,C191 D1,D2,D3,D4 D6,D7 D8 D9 Q6 Q13 Q1,Q14 Q8,Q11 Q7 Q9 U9,U14 U12 U4 U11 U1,U2 U5,U6 U8 U10 X1 L7EA (AL708) CC63303MD24 CAP ELEC 33U 16V(+-20%,105C,5*7,LESR) CC71004MD50 CAP ELEC 100U 25V(+-20%,105C,6*11,LESR) CC81001MD71 CAP ELEC DIP 1000U 6.3V +-20% 105C 8*11.5 CC74704MD29 CAP.
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13. SPARTS PARTS LIST Part No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Remark 45LM7AB0008 LM7S AUDIO/B ASSY Audio Board 33LM7BB0001 LM7S BUTTON/B ASSY Button Board 31L7EMB0007 L7E MB ASSY MB Board AA0170E1003 LCD(TFT) 17" QD170E1LG03 REV:A LCD panel AS022167304 INV MODULE(AMB)LM7S(12V,V=675V,A2A) Inverter AG12042BY21 ADP 12V 4.