Acer AC711 AC711 Monitor Service Guide
Acer AC711 Manual
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- Acer AC711 | AC711 Monitor Service Guide - Page 1
...17 6. VIDEO AMP. CIRCUIT 17 A. VIDEO PRE. AMP...20 B. VIDEO AMPLIFIER...20 7. TROUBLESHOOTING 19 A. POWER SUPPLY CHECK ...22 B. MONITOR CHECK FLOW CHART 23 APPENDIX A: PART LIST 23 APPENDIX B: P. C. B. ASSEMBLY 73 APPENDIX C: DISPLAY UNIT ASSEMBLY 108 APPENDIX D: CRT & YOKE ASSEMBLY 122 1 - Acer AC711 | AC711 Monitor Service Guide - Page 2
PHASE SCREEN CENTER ± 4 mm V.CENTER SCREEN CENTER ± 3 mm C. LINEARITY The linearity of an image displayed on the CRT monitor for at least 30 minutes before adjustment. • Set the front of CRT to the east. • Turn all VR set to center position. D-1. H.V 1. Use front control key adjust the display - Acer AC711 | AC711 Monitor Service Guide - Page 3
E. GEOMETRIC DISTORTION E-1 Raster Rotation Signal No.1 to 6 | a - b | ≤ 2.0 mm E-2 Pincushion Signal No.1 to 6 Top : d1 ≤ 2.0 mm Bottom : b1 ≤ 2.0 mm Leftside : a1 ≤ 1.5 mm Rightside : c1 ≤ 1.5 mm E-3 Barrel Signal No.1 to 6 Top : d2 ≤ 2.0 mm Bottom : b2 ≤ 2.0 mm Leftside : a2 ≤ 1.0 mm - Acer AC711 | AC711 Monitor Service Guide - Page 4
OSD's size control to get display size within 310x232p±2mm. F.1.2 temperature within specified coordinates. F.1.4 Manual alignment P103 must be short in 6500 color coordinate separately. Repeat item 2.5.5 ~ 2.5.8 to meet specificity. F.1.10 Adjust brightness control to get raster is - Acer AC711 | AC711 Monitor Service Guide - Page 5
to fall white, adjust SB to get 92< Y - Acer AC711 | AC711 Monitor Service Guide - Page 6
G. PRESET TIMING Preset Timing Chart [ H-SYNC ] Th Tdh Tsh Tbh Tfh [ VIDEO ] [ V-SYNC ] Tbv Tv Tsv [ VIDEO ] Tdv Tfv No Signal Name 1 VGA 640*480(60) Clock Fh Fv Th Tsh T f h Tbh Tdh Tv Tsv Tfv Tbv Tdv (MHz) (kHz) (Hz) (uSec) (uSec) (uSec) (uSec) (uSec) (mSec) (mSec) (mSec) (mSec) ( - Acer AC711 | AC711 Monitor Service Guide - Page 7
2. CONTROL AND CONNECT LAYOUT 7 - Acer AC711 | AC711 Monitor Service Guide - Page 8
A. Main PCB 8 - Acer AC711 | AC711 Monitor Service Guide - Page 9
B. VIDEO PCB 9 - Acer AC711 | AC711 Monitor Service Guide - Page 10
C. PIN ASSIGNMENT C-1. Connect Table 1 2 3 4 5 6 7 8 9 10 P102 DETECT DDC-SCL DDC-SDA GND V-sync H-sync 5V from PC P105-P202 V-OUT OSD-SDA OSD-SCL H-out GND P104-P203 AFC GHD G1 HEATER 5V 80V 12V ABL C-2. Connect Function P803 : P501 : P103: P902 : P804 : H-CENTER CONN TILT CONN PRESET CONN - Acer AC711 | AC711 Monitor Service Guide - Page 11
circuit. (5) +80V: For video circuit (6) 9.2V: for MIRCO- P Fig 2 is the function block diagram of power CKT. B. DEFLECTION: Produce YOKE deflection current of horizontal and vertical, CRT H.V and bias that makes screen raster. C. VIDEO: amplify the video signal and add the signal to the cathode of - Acer AC711 | AC711 Monitor Service Guide - Page 12
uP H.V. 25KV to CRT Dynamic Focus to CRT G2 Voltage 550V to CRT 1 2 NT6827 OSD generator 13.5V TDA8172 Vertical Output AMP. UP WT62P1 5V -12V B++16V B+-16V H-center ADJ. G1 ADJ. Voltage generator -145V E E- P-ROM 24C08 12V TDA4856 H.V Sync Processor 12V 13.3V H-Driver & H-Scan Stage - Acer AC711 | AC711 Monitor Service Guide - Page 13
1 Fig1 13 - Acer AC711 | AC711 Monitor Service Guide - Page 14
Fig2 14 - Acer AC711 | AC711 Monitor Service Guide - Page 15
cause a voltage spike which be added to the normal reset voltage across T900 when Q901 turn off. The clamp consisting monitor enters OFF mode if H-sync and/or V-sync are removed. When in the OFF State, PS1 should below simultaneously to turn off +13.5Vs outputs. PS2 should enter PWM Pulse to pre- CRT - Acer AC711 | AC711 Monitor Service Guide - Page 16
F. DEGAUSS CKT: The DEGUSS signal which comes from micro-p to control degauss coil act or not. When DEGUSS is high, Q950 will be saturated to make RL901 working, AC line provides a degaussing current to degauss coil. G. OVERLOAD PROTECTION CKT: The primary current flows through the current sensing - Acer AC711 | AC711 Monitor Service Guide - Page 17
to U401 TDA4856. The H-out, V-out always are positive. B. HORIZONTAL PROCESSOR Fig 3 is the block diagram of IC TDA4856. The IC TDA4856 output vertical sawtooth and H-Drive signal to produce, H.V deflection. Meanwhile to the secondary of F.B.T to produce about 25.3KV for CRT anode voltage. 17 - Acer AC711 | AC711 Monitor Service Guide - Page 18
Fig3 18 - Acer AC711 | AC711 Monitor Service Guide - Page 19
Fig4 19 - Acer AC711 | AC711 Monitor Service Guide - Page 20
0.7Vpp, then pre-amp IC U201 amplify the video signal to 3~4Vpp. The U201 is controlled by up via I2C bus, Fig5 is the block diagram. B. VIDEO AMPLIFIER The video amplifier is U203(LM2467), it amplify video signal to about 40Vpp. Video output signal add to cathode by AC coupling, Fig6 - Acer AC711 | AC711 Monitor Service Guide - Page 21
Fig6 Fig7 21 - Acer AC711 | AC711 Monitor Service Guide - Page 22
7. TROUBLESHOOTING A. POWER SUPPLY CHECK 22 - Acer AC711 | AC711 Monitor Service Guide - Page 23
B. MONITOR CHECK FLOW CHART B-1. No Raster 23 - Acer AC711 | AC711 Monitor Service Guide - Page 24
B-2. No Picture 24 - Acer AC711 | AC711 Monitor Service Guide - Page 25
B-3. No Vertical Deflection ( rester become a horizontal line) 25