Acer AC 711 Service Manual Download | Manualshive

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7. TROUBLESHOOTING

A. POWER SUPPLY CHECK

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Summary of Contents for AC 711

Page 1: ... FILTER CKT 15 B FLYBACK AND PWM CKT 15 C SNUBBER CKT 15 D SYNCHRONIZED CKT 15 E POWER SAVING CKT 15 F DEGAUSS CKT 16 G OVERLOAD PROTECTION CKT 16 5 DEFLECTION 14 A SYNC RPOCESSOR 17 B HORIZONTAL PROCESSOR 17 C VERTICAL OUTPUT 17 D HORIZONTAL OUTPUT STAGE 17 E FLYBLACK TRANSFORMER 17 6 VIDEO AMP CIRCUIT 17 A VIDEO PRE AMP 20 B VIDEO AMPLIFIER 20 7 TROUBLESHOOTING 19 A POWER SUPPLY CHECK 22 B MONIT...

Page 2: ...equirements with reference to figure 4 05 for both X and Y and axis The measured value of linearity shall be less than 6 p or 8 s when calculated using all lattices and shall be less than 5 p or 6 s when calculated using adjcent lattices Xmax Xmin OR Ymax Ymin Xmax Xmin Ymax Ymin Where Xmax Xmin be Calculated Same Line Ymax Ymin be Calculated Same Row D ALIGNMENT PROCEDURE Warm up the monitor for ...

Page 3: ...1 b1 c1 d1 E 3 Barrel Signal No 1 to 6 Top d2 2 0 mm Bottom b2 2 0 mm Leftside a2 1 0 mm Rightside c2 1 0 mm a2 b2 c2 d2 E 4 Trapezoid Signal No 1 to 6 Top d 2 5 mm Bottom b 2 5 mm Leftside a 2 5 mm Rightside c 2 5 mm c b a d E 5 Parallelogram Signal No 1 to 6 a 0 5 degree a E 6 Overall Distortion Signal No 6 only Top d 2 5 mm Bottom b 2 5 mm Leftside a 2 5 mm Rightside c 2 5 mm c b a d ...

Page 4: ... sub contrast SC is 0 F 1 6 Disable the video pattern for a raster pattern set the maximum value of contrast and brightness is 255 adjust G1 to Y 0 01 cd mm F 1 7 Adjust bias G to get Y 1 8 0 06 cd mm Adjust bias B to get y 297 y 315 for 7500 y 329 for 6500 5 Adjust bias R to get x 283 x 295 for 7500 x 313 for 6500 3 F 1 8 Fine tune the bias G and R for x 283 y 297 x 299 y 315 for 7500 x 313 y 329...

Page 5: ... 2 F 1 14 Check 150 Y 130 cd mm if not adjust G to get Y 130 cd mm then repeat item 2 5 12 F 1 15 Change pattern to fall white adjust SB to get 92 Y 113 cd mm F 1 16 Select 7500 and 6500 color coordinate separately Repeat item 2 5 11 2 5 15 to meet specificity 7500 X 300 Y 315 6500 X 313 Y 329 ...

Page 6: ...056 3 0 019 1 0 503 27 11 179 600 3 VESA 1024 768 85 94 500 68 677 84 997 14 561 1376 1 016 96 0 508 48 2 201 208 10 836 1024 11 765 808 0 044 3 0 015 1 0 524 36 11 183 768 4 VESA 800 600 75 49 500 46 875 75 000 21 333 1056 1 616 80 0 323 16 3 232 160 16 162 800 13 333 625 0 064 3 0 021 1 0 448 21 12 800 600 5 VESA 1024 768 75 78 750 60 023 75 029 16 66 1312 1 219 96 0 203 16 2 235 176 13 003 1024...

Page 7: ...7 2 CONTROL AND CONNECT LAYOUT ...

Page 8: ...8 A Main PCB ...

Page 9: ...9 B VIDEO PCB ...

Page 10: ...P203 1 DETECT V OUT AFC 2 DDC SCL OSD SDA GHD 3 DDC SDA OSD SCL G1 4 GND H out HEATER 5 V sync GND 5V 6 H sync 80V 7 5V from PC 12V 8 ABL 9 10 C 2 Connect Function P803 H CENTER CONN P501 TILT CONN P103 PRESET CONN P902 DEGAUSSING COIL CONN P804 X RAY TEST PAD ...

Page 11: ...ertical deflection circuit 2 11 5V For vertical deflection circuit 3 7 2V For CRT heater parts of video pre amp circuit 4 53V For B Boost 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 sig...

Page 12: ... B 16V B 16V D A Output from uP LM1269 Video Pre AMP UP WT62P1 NT6827 OSD generator OSD DATA EE P ROM 24C08 Power generator 12V 9 2V 53V 80V 13 5V 78R05 78R12 LM2467 Video Output AMP CRT DY ASSY R G B out TDA4856 H V Sync Processor TDA8172 Vertical Output AMP V sawtooth B generator H Driver H Scan Stage FBT H V generator H center ADJ G1 ADJ Voltage generator ...

Page 13: ...13 Fig1 1 ...

Page 14: ...14 Fig2 ...

Page 15: ...utput capacitors Many cycles of this store release action are needed to charge the outputs to their respective voltages The voltage across C946 is fed through a voltage divider R970 R971 R973 C975 R976 R977 and VR901 to the error amplifier U904 compared to an internal 2 5V reference then determine the feed back level of U901 pin 1 C SNUBBER CKT Energy stored in the leakage inductance of T900 cause...

Page 16: ...CTION CKT The primary current flows through the current sensing resistor R907 The sensing voltage through the R907 R911 C914 to U901 pin3 If the current up the U901 pin 3 voltage will be follow up When the voltage 1 V the U901 duty cycle shall be limited Made the output voltage down in the meanwhile make the U901 VCC voltage down the U901 pin 7 fall down under 10 voltage in the then U901 stop acti...

Page 17: ...V signal IC pin 6 that can control B voltage C VERTICAL OUTPUT Fig 4 is the block diagram of IC TDA8172 Input vertical sawtooth signal from TDA4856 to TDA8172 then TDA8172 produce vertical deflection current D HORIZONTAL OUTPUT STAGE F 33K 33K F 36K 36K F 41K 41K F 52K 52K F 58K 58K F 65K 65K F SW1 L L L H H H H SW2 L H H L L H H SW3 L L H L H L H E FLYBLACK TRANSFORMER In the primary of F B T the...

Page 18: ...18 Fig3 ...

Page 19: ...19 Fig4 ...

Page 20: ...nal to 3 4Vpp The U201 is controlled by up via I2 C 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 is the block diagram The DC bias is controlled by the IC U204 LM2480 Fig7 is the block diagram Fig 6 is the block diagram ...

Page 21: ...21 Fig6 Fig7 ...

Page 22: ...22 7 TROUBLESHOOTING A POWER SUPPLY CHECK ...

Page 23: ...23 B MONITOR CHECK FLOW CHART B 1 No Raster ...

Page 24: ...24 B 2 No Picture ...

Page 25: ...25 B 3 No Vertical Deflection rester become a horizontal line ...

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