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Circuit Operation Theory

API Confidential

No Copy/Reproduction Allowed

2-11

This circuit has the function of auto degaussing and manual degaussing. When power supply is

switched ON it is auto degaussing stage. When user make the selection of the manual degaussing

function in OSD, the degaussing current will flow through coil to degauss the screen of monitor.

TR602 is a PTCR to control degaussing coil current

2.2.3.8 Power Saving Control

Mode

H-sync

V-sync

LED

Power Rating

Normal

Green

100

Stand-by

None

Normal

Orange

15W

Suspend

Normal

None

Orange Flash

Off

None

Orange Flash

When both of the H-sync and V-sync are none, the power 6.3v and+15v output will be cut-

off. The power input will be under 5W. When the H-sync is none, the power 15v output will

be cut-off. The power input will be under 15W. When the V-sync is none, the power 6.3v

and+15v output will be cut-off. The power input will be under 5W.

2.2.4 Video C.K.T. Block Diagram

PREAMP
CKT
LM1279

IC101

CRT DRIVER
CKT
LM2407
IC102

ABL CKT
Q322,323

R OSD

G OSD

B OSD

CONTRAST
(FROM IC801)

BEAN CURRENT
(FROM F.B.T.)

H-BLANK
CKT
Q320

H-PULSE
(FROM F.B.T.)

(FROM
IC 1901 )

DRIVE
(FROM IC1901)

DC RESTORE
Q111,112
Q131,132
Q151,152

BIAS
(FROM IC 1901)

BRIGHTNESS CKT: Q203
CHANGE MODE BLANK CKT:Q202
V BLANK CKT: Q202
SPOT KILLER CKT: Q202

VIDEO

CUT

2.2.4.1 OSD Preamp CKT

(a) AS shown in the block diagram:

The R/G/B signals will generate an enough amplitude of Vpp to show up on the CRT screen after

the amplification of two amplifiers. The first one, preamp CKT, process the signal and mix up the

OSD, and the second one does the power amplification.

(b) OSD preamp IC101, LM1279, will output the R.G.B signals seperately. The R.G.B driver will

control the gain of these three guns individually to approach the white balance of CRT.

the CRT driver CKT will generate a level higher than Black Level. (i.e. SYNC TIP), therefore the

video signal will be blanked in order to prevent the fold over to occure while adjusting H-phase.

Besides, the SYNC TIP is used for the DC Restoration of cascode CKT.

(d) LM1279 is equipped with OSD mixer. when signal CUT is Low, the output of LM1279 is video

Содержание 7277e

Страница 1: ...7277e Monitor Service Guide September 1998 Printed in Taiwan PART NO 49 70601 271 DOC NO 9809A 7277ESG ...

Страница 2: ...ical magnetic optical chemical manual or otherwise without the prior written permission of Acer Peripherals Inc Disclaimer Acer Peripherals Inc makes no representations or warranties either expressed or implied with respect to the contents hereof and specifically disclaims any warranties mechantability or fitness for any particular purpose Further Acer Peripherals Inc reserves the right to reserve...

Страница 3: ...1 Input Power Requirements 1 7 1 3 2 2 Output Power Requirements 1 8 1 3 2 3 AC Power Inlet 1 8 1 3 2 4 Power Cord 1 8 1 3 2 5 Power Management Function 1 8 1 3 3 CRT Requirements 1 8 1 4 Functional Specifications 1 9 1 4 1 Display Quality 1 9 1 4 1 1 Display Date Area with 20 ft l at full white pattern 1 9 1 4 1 2 Video AMP Performance 1 9 1 4 1 3 Light Output 1 9 1 4 1 4 Contrast Adjustment Rang...

Страница 4: ...2 1 1 The Block Diagram of Deflection 2 1 2 1 2 Autosync Deflection Controller TDA4854 2 1 2 1 3 H Driver Output CKT 2 2 2 1 4 Dynamic Focus CKT 2 2 2 1 4 1 Vertical Dynamic Focus 2 3 2 1 4 2 Horizontal Dynamic Focus 2 3 2 1 5 Brightness Spot Killer CKT 2 3 2 1 5 1 G1 CKT 2 3 2 1 5 2 Blanking CKT 2 3 2 1 6 BDRV and Step up CKT 2 4 2 1 7 H center CKT 2 5 2 1 8 HV Shutdown Circuit 2 5 2 1 9 Horizont...

Страница 5: ... size Preset 3 1 3 6 Factory Setting Mode Adjustment 3 1 3 7 Focus Adjustment 3 2 3 8 Convergence Adjustment 3 2 3 9 Color Temperature Auto Aalignment 3 2 3 9 1 Preparing Items 3 2 3 9 2 Alignment Procedure 3 2 3 9 3 Clear All of User Mode Data 3 2 3 10 Geometry Specification 3 2 3 11 Power Saving Function Check 3 3 4 TROUBLESHOOTING 4 1 4 1 Check MCU and OSD for No Video Output 4 1 4 2 Check OSD ...

Страница 6: ......

Страница 7: ...n and power management is compliant with VESA and TCO The monitor is available with two industrial designs one for ACER and the other for OEM It has the following features With unique design of iScreen universal switching power supply 0 28mm dot pitch CRT User controls Power on off P S are all in front bezel On screen control indicators for user P1 display Contrast Brightness H phase H size V cent...

Страница 8: ...G Gross Wt No of Drops Drop Height 41 60 991b 18 7 27 7kg 10 24 61cm 1 2 3 2 Drop Sequence 2 1 5 3 4 6 Surface 2 Front 3 Bottom 4 Rear 5 Left 6 Right 1 Top Manufacturing joint Corner 5 3 2 select at weakness side the low left or right corner of the front panel An edge drop with impact on the shortest edge radiating from corner 5 3 2 An edge drop with impact on the next shortest edge radiating from...

Страница 9: ...German ergonomic standard ISO9241 3 Ergonomic Requirements of Visual Display Demko EN60950 Nemko EN60950 Semko EN60950 Fimko EN60950 CE marking compliance 73 23 EEC EN60950 1 2 6 EMC Requirements This display unit complies with the following RFI rules and regulations 1 2 6 1 110V Version FCC compliance FCC Rule Part 15 Subpart B Class B VCCI 1 2 6 2 220V Voltage CE Mark Compliance 89 336 EEC EN500...

Страница 10: ... adapters The pin assignment s of this connector are as the follows 1 5 6 10 11 15 15pin mini D sub male 1 RED VIDEO 2 GREEN VIDEO 3 BLUE VIDEO 4 GROUND 5 GROUND 6 RED GROUND 7 GREEN GROUND 8 BLUE GROUND 9 5V 10 SYNC GROUND 11 GROUND 12 SDA 13 H SYNC H V 14 V SYNC 15 SCL 1 3 1 1 2 Cable Length 1500mm 20mm 1 3 1 2 Video Signal Analog 0 7 Vpp 75 ohm positive 1 3 1 3 SYNC Signal Separate SYNC TTL lev...

Страница 11: ... C B E PRESET TIMING VGA SVGA Timing VGA400 VGA480 6448A 6448B fH 31 47KHz 31 47KHz 37 50KHz 43 27KHz Aus 31 77 31 77 26 667 23 111 Bus 3 81 3 81 2 032 1 556 Cus 1 907 1 907 3 81 2 222 Dus 25 42 25 42 20 317 17 778 Eus 0 64 0 64 0 508 1 56 fv 70 08Hz 59 94Hz 75 0Hz 85Hz Oms 14 27 16 68 13 333 11 764 Pms 0 064 0 064 0 080 0 069 Qms 1 112 1 05 0 427 0 578 Rms 12 711 15 25 12 80 11 093 Sms 0 383 0 32...

Страница 12: ... fv 72 01Hz 75Hz 85Hz 75 029Hz Oms 13 887 13 333 11 756 13 328 Pms 0 124 0 064 0 056 0 05 Qms 0 667 0 448 0 503 0 466 Rms 12 510 12 8 11 179 12 795 Sms 0 772 0 021 0 018 0 017 Display Resolution 800x600 800x600 800x600 1024x768 Polarity H V sync Type separate separate separate separate 1024 X 768 Non interlaced Timing 1280 X 1024 Timing UVGA1 UVGA2 WS2 fH 48 363kHz 56 476kHz 63 69kHz Aus 20 677 17...

Страница 13: ...Level The levels of Horizontal Vertical SYNC will be TTL level their high level will be 2 4 5 5V and low level will be 0 0 2V 3 Video Signal Level The video signal when terminated with an idea 75ohm termination will have a range of 0V to 0 7V nominal and its full scale output will be 0 7V and black level will be between 0V and 0 1V 1 3 2 Power Supply Requirements 1 3 2 1 Input Power Requirements 1...

Страница 14: ...all supply DC power outputs as followings Output Nominal Regulation Load Current Range 1 14V 3 0 4A 0 75A 2 80V 3 0 02A 0 15A 3 6 5V 3 0 6A 0 95A 4 45V 3 0 8A 1 0A 5 5V 3 0 02A 2 0A 1 3 2 3 AC Power Inlet The display unit shall be supplied with an AC power NICOON NC 174 or equivalent to be located at the rear of the display 1 3 2 4 Power Cord Each display unit shall be supplied with a power cord w...

Страница 15: ...attern measure method Input Cross hatch pattern signal then set External contrast Adjustment max and Brightness 30 and measure the output signal from each cathode of detached CRT socket at the equivalent cathode capacitance when probe is attached From measuring the high frequency part of Input signal we get the video AMP performance parameter defined above 1 4 1 3 Light Output 1 At 3 block pattern...

Страница 16: ...s 30cm from eyes to screen 1 AC power input fluctuated from 90Vac to 264Vac 2 Brightness contrast control changed from max to min or vice versa 1 4 1 10 Focus The distance of watch is 30cm from eyes to screen Under the condition of luminance of 20Ft L at full white pattern brightness control factory setting contrast control adjusted all characters on the screen in the pattern will be clear 1 4 1 1...

Страница 17: ...ed Timing III 26 45 Standard Timing Identification 27 59 1 800x600 85Hz 28 81 2 1280x1024 60Hz 29 80 2A 31 3 640x480 85Hz 2B 59 2C 61 4 1024x768 85Hz 2D 59 2E 01 5 2F 01 30 01 6 31 01 32 01 7 33 01 34 01 8 35 01 36 00 Detailed Timing Description 1 37 00 38 00 39 FE 3A 00 3B 4D 3C 6F 3D 6E 3E 69 3F 74 40 6F 41 72 42 0A 43 20 44 20 45 20 46 20 47 20 Address Data Description 48 00 Detailed Timing Des...

Страница 18: ...Description 6C 00 Detailed Timing Description 4 6D 00 6E 00 6F FE 70 00 71 4D 72 6F 73 6E 74 69 75 74 76 6F 77 72 78 0A 79 20 7A 20 7B 20 7C 20 7D 20 7E 00 Extension Flag 7F Check sum Serial number format API Bar code ID of model name Note 1 Bit Bit Description 7 Analog Digital Signal Level 6 Signal Level Standard 6 5 Signal Level Standard 5 4 Setup 3 Sync Inputs Supported 3 2 Sync Inputs Supporte...

Страница 19: ...n volts below blank Bit 6 Bit 5 Operation 0 0 0 700V 0 300V 1 000V p p 0 1 0 714V 0 286V 1 000V p p 1 0 1 000V 0 400V 1 400V p p 1 1 Reserved TBD 4 Setup If set the display is set to expect a blank to black setup or pedestal per the appropriate signal level standard 3 0 Sync Inputs See Bit Operation below 3 Separate Sync 2 Composite Sync on H Sync line 1 Sync on Green Video 0 Serration of the V Sy...

Страница 20: ... VESA 2 1024 768 70Hz VESA 1 1024 768 75HZ VESA 0 1280 1024 75HZ VESA Byte 3 bit Manufacturer s Timings Manufacturer s Specified Timing 7 1152 870 75Hz Mac II Apple 6 640 480 85HZ 5 800 600 85HZ 4 1024 768 85HZ 3 1280 1024 85HZ 2 1600 1200 75HZ 1 1600 1200 85HZ 0 Flag If set 1 then bits 6 1 inclusive should be interpreted as Manufacture Timings as EDID Ver 1 Rev 0 1 4 2 Color Quality 1 4 2 1 Misco...

Страница 21: ...he central brightness of 20 Ft L the corner A B C D brightness must be 14 Ft L A B 75mm 20Ft L 80mm A B C D 14Ft L C D 75mm 100mm 110mm 100mm Indicator of Testing Position 1 4 2 6 Degaussing Degaussing shall occur automatically when the monitor is turned on and shall be sufficient to demagnetize the CRT to any possible change in Earth s magnetic field from movement or shipment Degaussing shall occ...

Страница 22: ...ing functions The operation procedures are as follows a Press page 2 times to enter to this page for function adjustment b Degaussing Press the key to first icon then press S key the monitor will auto degauss c For the C1 C5 are color storage area which with factory preset and also can be modified by user The preset information as follows COLOR MODE COLOR TEMPERATURE PRESET C1 9300K C2 6500K C3 55...

Страница 23: ...rized different display modes and Tilt only can be saved in one mode The user settings are stored one by one in the user setting area When the number of setting exceed user setting area it will overlap from the first user setting There is 1 user setting for Brightness control level There is 1 user setting for Contrast control level 1 4 3 5 OSD Screen Position The OSD screen position is defined wit...

Страница 24: ...nutes 1 6 3 Accessibility 1 6 3 1 General All panels covers and major assemblies are removable without disruption of permanent mounting or fasteners 1 6 3 2 Outside Cabinet Access to the Following Elements Operating Controls see section 4 3 Power Connectors see section 3 2 1 6 3 3 Cover Removal Access All sub assemblies and internally adjustable components may be accessed by removing the bucket an...

Страница 25: ... API Confidential No Copy Reproduction Allowed 1 19 Fig 1 Linearity Measurements X1 X2 X3 X4 X6 X7 X8 X9 X10 X11 X18 Y0 Y1 Y2 Y3 Y4 Y5 Y8 Y10 Y7 Y6 Y11 Y12 Y13 X5 Y9 Xmax Xmin X 100 Xmax Xmin Ymax Ymin X 100 Ymax Ymin ...

Страница 26: ...Copy Reproduction Allowed 7277e Monitor Service Guide Fig 2 Pincushion Measurements A B represented as display area width and height Top Bottom Pincushion a1 or a2 Side Pincushion b1 or b2 substituted A by PS QR 2 B by PQ RS 2 ...

Страница 27: ...I Confidential No Copy Reproduction Allowed 1 21 Fig 3 Barreling Measurements A B represented as display area width and height Top Bottom Pincushion a1 or a2 Side Pincushion b1 or b2 substituted A by PS QR 2 B by PQ RS 2 ...

Страница 28: ... Reproduction Allowed 7277e Monitor Service Guide Fig 4 Trapezoid Measurements Each of the 4 corners of picture shall fall within the relevant area F illustrated up hatched ABCD is the picture outlines V Cent A B 6mm H Cent C D 6mm ...

Страница 29: ...System Overview API Confidential No Copy Reproduction Allowed 1 23 Fig 6 Physical Dimension Front View ...

Страница 30: ...1 24 API Confidential No Copy Reproduction Allowed 7277e Monitor Service Guide Fig 7 Physical Dimension Side View ...

Страница 31: ...utput Circuit Shut down Circuit G1 Spot Killer Circuit Dynamic Focus G1 2 1 2 Autosync Deflection Controller TDA4854 Pin 1 is AFC feedback Pin XRAY if V XRAY threshold 6 25V typical switches the whole IC into protection mode Pin 3 4 5 6 8 for B control function block Pin 11 EWDRV is a parabolic waveform used for pincushion correction Pin 16 generates video claming blanking pulse Pin 18 19 is I2C d...

Страница 32: ...1 3 6K 22K 1 200K 50V 47U EL 25V 47OU EL 50V 1U EL 100V 2200P PE 100V 0 1U PE 100V 8200P PE 100V 0 1U PE 25V 100U EL 2K 12V 12V SCL H SYNC V SYNC SC0 SDA SC1 BLANK 6 5V HDRV EWDRV SC2 V2 V1 HFLB FOCUS VSMOD HSMOD 48V 48V CLAMP 14V TP3 TP2 Fig 2 Autosync Deflection Controller circuit 2 1 3 H Driver Output CKT HDRV signal comes from IC201 pin8 then goes into Q301 Q301 constitutes an inverting stage ...

Страница 33: ...1 2W 20 12V CS 1 FOCUS 190V CS 2 DAF Fig 4 Dynamic Focus circuit 2 1 5 Brightness Spot Killer CKT 2 1 5 1 G1 CKT The bright control signal from UC controller is about 0 5V when the voltage of bright control signal increases the current flow through R241 increases and the voltage of G1 decreases 2 1 5 2 Blanking CKT To avoid the disturbed picture display on the screen we have to blank the monitor i...

Страница 34: ...RITE BLANK 6 5V 190V 48V G1 CLAMP Fig5 Brite Spotkiller circuit 2 1 6 BDRV and Step up CKT The BDRV signal from TDA4854 pin6 is a square waveform It is inverted and amplified by Q201 Q310 and Q311 constitute a buffer stage Q312 L301 D318 C323 is step up circuit B 45 ton toff toff R370 R371 L306 L301 Q311 C322 C323 Q310 C334 Q312 D317 D318 C337 R333 47 1 4W 3 3 BEAD 19 60058 001 2mH A733 D 500V 0 0...

Страница 35: ...threshold 6 25v typical the pins HDRV BDRV VOUT1 and VOUT2 are floating When anode voltage increases the voltage at FBT pin3 increases the voltage at IC201 pin2 increases The shutdown voltage is about 28KV GND HPLL2 HSMOD FOCUS SGND VSMOD ASCOR SDA SCL HUNLOCK VCC i c BDRV HFLB 32 31 30 29 28 27 26 25 24 23 22 21 20 19 18 17 CLBL HSYNC VSYNC VOUT1 VOUT2 EWDRV VAGC VCAP VREF HPLL1 HBUF HREF HCAP HD...

Страница 36: ...it will pull down the voltage of the video preamp pin 11 to reduce the gain of video amplifier R383 C333 C330 ZD301 Q322 D323 Q323 R357 R360 R359 R355 R358 R356 R385 R328 D324 R377 R378 R376 Q324 47K 50V 1U EL MONO 50V 0 1U 6 8V A673 OPEN H945 1 57 6K NTC 10K 2 2K OPEN 1 15 4K 10K 4 7K 8 2K OPEN OPEN 2 2K 2 4K H945 12V 12V CONT ABLADJ ABL A Fig 10 ABL circuit ...

Страница 37: ...nfiguration The signals from TDA4854 differential output VOUT1 and VOUT2 are connected to TDA8351 via DC Coupled The vertical deflection coil is connected between the output amplifier TDA 8351 pin4 and pin7 which are driven in phase opposite The TDA8351 can output current to drive vertical deflection yoke it can be calculated by I R250 R250 I coil R229 PIN8 GUARD is used for vertical blanking VI F...

Страница 38: ...K CONTROL CIRCUIT ISOLATION TRANSFOR MER POWER SAVING CONTROL OUTPUT RECTIFIER AND FILTER OUTPUT AC INPUT 2 2 3 Circuit Operation Theorem 2 2 3 1 RFI Filter 250V 2200P Y C602 3 4 1 2 L602 250V 2200P Y C603 L604 L603 250V 0 47U X C601 N FG L R601 This circuit designed to inhibit electric and magnetic interference for meet FCC VDE VCCI standard requirements 2 2 3 2 Rectifier and Filter 2 4 3 1 D602 ...

Страница 39: ... energy taken from the input is stored in the transformer when the switching transistor turn off this stored energy is all delivered to the output 2 2 3 4 Output Rectifier and Filter The structure of each output is illustrated as below T601 C1 C2 D1 L1 Since the transformer T601 acts as a storing energy inductance diode D1 and capacitor C1 are to produce a dc output and additional L1 C2 to suppres...

Страница 40: ...The D611 D612 R614 C617 are soft start components to avoid the duty too large when power starts up 2 2 3 6 Feedback Circuit This power supply adopt feedback circuit of 45V and 15V It used IC702 for voltage regulation and IC602 for primary secondary isolation The output voltage differential signal will be detected and sensed to the pin2 of UC3842 for comparison then the duty cycle of MOSFET will be...

Страница 41: ...CKT Q322 323 R OSD G OSD B OSD CONTRAST FROM IC801 BEAN CURRENT FROM F B T H BLANK CKT Q320 H PULSE FROM F B T FROM IC 1901 R G B DRIVE FROM IC1901 DC RESTORE Q111 112 Q131 132 Q151 152 R G B BIAS FROM IC 1901 R G B G1 BRIGHTNESS CKT Q203 CHANGE MODE BLANK CKT Q202 V BLANK CKT Q202 SPOT KILLER CKT Q202 R G B VIDEO CUT 2 2 4 1 OSD Preamp CKT a AS shown in the block diagram The R G B signals will ge...

Страница 42: ...ru is set at 110V and the black level of cathode is 60v the picture wont show the signals higher the black level once the G1 voltage is lower than 50v b As described above we may using the voltage control G1 as the brightness control Generally the G1 control range is about 10 15V if the raster brightness is form 0 to 1 5 ft L c Similarly we may overlap a negative pulse of vertical duration on the ...

Страница 43: ...flection circuit 2 To check if there is the same saved mode in the EEPROM and get the data to transfer into DC voltages by PWM output and RC filter circuits to control the picture color contrast and brightness 3 To check if there is the valid key be pressed and do the key function 4 To memorize mode timings and any adjustable parameters of the picture into EEPROM 5 To output data to OSD IC for mak...

Страница 44: ... The MCU send clock and data to EEPROM to do Write function and send clock and receive data from EEPROM to do Read function by these two wires We define three parts of storage area One is for the storage of the factory preset data another is for saving user adjusted data the other is for common settings area where stored the data of the OSD color temperature settings contrast and brightness value ...

Страница 45: ...r Auto Calibration Start Press i key Change mode Preset timing User saved timing Detect if the pattern is normal Determine a preset timing Read data of timing from EEPROM Determine h_phase h_size Determine v_center v_size Show the correct pattern on screen NO YES NO 1 1 1 YES YES YES NO YES NO NO ...

Страница 46: ......

Страница 47: ...brightness in cut off c Adjust main board VR701 let output Voltage 450 2V at D702 3 3 HV Adjustment a Input mode 37k 6448A with crosshatch pattern b Adjust VR201to let anode voltage be 260 1kV 3 4 H center Adjustment a Input mode 68k UVGA8 with crosshatch pattern b Adjust TP6 to TP4 or TP5 or TP7 to make raster in CRT center 3 5 H size Preset a Input mode 37k 6448A with crosshatch pattern b Use OS...

Страница 48: ...o maximum position adjust the G2 VR such that the max color of R G B color bar on the monitor is in the mark region b Press SPACE BAR to do auto color temperature adjustment and color tracking C1 9300K X 281 5 Y 311 5 C2 6500K X 313 5 Y 329 5 C3 5500K X 332 5 Y 348 5 C4 7100K X 305 5 Y 315 5 C5 11500K X 275 5 Y 275 5 c Press SPACE BAR to get full white pattern and set contrast and brightness to ma...

Страница 49: ...r and the LED indicator is amber flash The power consumption should be less than 5W e Remove both syncs from input the unit will go into Off mode The picture will disappear and the LED indicator should flash every 1 25 second OFF and 0 5 second ON The power consumption should be less than 5W in this case f Input H sync and V sync signals in case c d and e the unit will recover to normal state and ...

Страница 50: ......

Страница 51: ...901 pin2 3 OSD IC DC level 1 3V 3 IC1901 pin10 pin16 output PWM Check F12M CKT on the Main Board on Main Board check OSD IC pin2 3 oscillation IC1901 DC level 1 3V Check MCU IC801 Reset pin9 H to L ok Check IC801 BLANK L ok Check IC802 EEPROM ok Check 1 V FREQ circuit 2 H FREQ circuit 3 IC801 pin 13 15 Check 1 pin5 SDA 2 pin6 SCL 3 IC802 data EEPROM Brightness Contrast Check DCLK DATA ok 1 On the ...

Страница 52: ... maybe IC101 pin 10 short Check IC101 pin 18 15 12 If they are 0 volts replace a new IC to IC101 Check RGB cathode If anyone pin is 0 volt replace a new IC to IC102 Check IC102 output path It must be right and without short circuit Check G1 voltage If it is lower equal than 182 volts check spot killer circuit and check IC801 pin36 Blank Check CRT heater If it is dark check 6 3v supply voltage of h...

Страница 53: ...serted error check spot killer circuit Case 11 Picture quality is not so good Check CRT socket Fix it if it is loose Check IC101 pin 11 clamp gate If it has no clamping pulse check H clamp pulse switch circuit Replace IC102 Case 12 Moire appears when Y is greater than 18 Ft l Run auto alignment procedure to acquire optimum G2 voltage If necessary decrease G2 voltage Case 13 H blank function failur...

Страница 54: ... CHECK J49 45V LED LIGHT CHECK POWER SAVING CKT YES REPLACE NG OK CHECK Q302 REPLACE NG CHECK STEP MP CKT Q312 D318 OK NG OK CHECK POWER SUPPLY CHECK IC201 TDA4856 4 6 H V Abnormal 5 H V ABNORMAL H V ABNORMAL CHECK FBT PIN2 AT VGA 31K ABOUT 63V CHECK C309 C306 YOKE CONNECTOR LINEAR COIL L305 REPLACE CHECK DRIVER CKT T302 L301 NG CHECK IC201 CHECK Q312 D318 OK CORRECT IT NG OK YES NO NG OK CHECK FB...

Страница 55: ...CHECK R215 R214 C210 YES REPLACE IC201 YES CHECK R251 R253 R249 C216 CHECK SUSPEND SIGNAL HIGH REPLACE NG YES CHECK Q702 NO CHECK POWER SUPPLY OK NG NG CHECK FBT T301 OK NO CHECK 14 5V REPLACE IC203 LM7812 OK CHECK Q701 EMITTER 14 5V YES CHECK POWER SUPPLY NO NO CHECK Q702 Q701 YES REPLACE NG CHECK 16V TRACE SHORT OK REPLACE SHORT COMPONENTS 7 PINCUSHION NG TRAPEZOID NG UNBALANCE NG PARALLEGRAM NG...

Страница 56: ...ECK R225 R224 YES REPLACE IC201 TDA4858 NO OK NG NO VERTICAL BLANKING CHECK IC202 TDA8351 PIN8 OUTPUT CORRECT REPLACE IC202 TDA8351 NG CHECK IC201 TDA4856 PIN16 OUTPUT CORRECT OK REPLACE IC201 TDA4856 NG CHECK R254 C223 Q202 R239 R232 YES NG 4 9 Spot Killer NG 9 SPOT KILLER NG SPOT KILLER NG CHECK 190V CHECK Q203 CIRCUIT CHECK 190V TRACE YES NO CHECK CONNECTOR P102 G1 VOLTAGE CHECK G1 VOLTAGE IF I...

Страница 57: ...L FOIL TRACE REPLACE OK NG REPLACE COMPONENT NG OK 4 11 Horizontal Size Can Not Control 11 HORIZONTAL SIZE CAN NOT CONTROL HORIZONTAL SIZE CAN NOT CONTROL CHECK Q314 Q315 Q316 REPLACE NG CHECK Q317 Q318 YES NO CHECK IC201 PIN11 ABOUT para wave REPLACE YES CHECK 12V REPLACE CHECK UC CIRCUIT 12 BRIGHTNESS CAN NOT CONTROL BRIGHTNESS CAN NOT CONTROL CHECK BRITE SIGNAL ADJUSTABLE CHECK UC CIRCUIT NO CH...

Страница 58: ...TION NG H V SIZE REGULATION NG REPLACE FBT H V OK CHECK ABL CIRCUIT MAIN BOARD OK REPLACE R329 R258 R211 V SIZE REGULATION NG CHECK REGULATION CIRCUIT R329 C324 R330 HMOD VMOD CKT REPLACE THE FAILURE COMPONENTS 4 13 Unstable Vertical Display 14 Unstable Vertical Display Unstable Vertical Displa IC201 pin 24 sawtooth genentor N Y Check IC201 Ambient CKT IC 202 has output N Y Check IC202 Ambient CKT...

Страница 59: ...Troubleshooting API Confidential No Copy Reproduction Allowed 4 9 4 14 No Blanking 15 No Blanking No Blanking IC801 pin 6 has output Check Q202 Ambient CKT Trace open ...

Страница 60: ...08 2212C 13D CAP DISC 220P 2KV C621 08 22217 303 CAP DISC Y 2200P 250V C603 C602 09 22717 014 CAP EL 220U 400V C612 09 33514 05D CAP EL BP 3 3U 50V C320 09 33616 01C CAP EL 33U 250V C326 09 33616 11C CAP EL 33U 250V C323 11 10536 06H CAP MPP 1U 250V C312 11 18436 12E CAP PMH 0 18U 250V C311 11 22337 064 CAP MPP 0 022U 400V C329 11 22436 03E CAP MPE 0 22U 250V C224 11 22437 03K CAP MPE 0 22U 400V C...

Страница 61: ...D310 D309 06 1R060 120 DIODE FAST RGP10J 600V D304 06 1R0A0 122 DIODE FAST UF4007 1KV D614 D610 D701 06 2R060 030 DIODE REC 20D6 600V D605 D604 D602 D603 08 1012C 34W CAP DISC 100P 2KV C307 08 1522G 13W CAP DISC 1500P 500V C331 08 22124 13W CAP DISC 220P 50V C335 C302 08 2212A 13W CAP DISC 220P 1KV C733 C701 C624 08 2222A 13W CAP DISC 2200P 1KV C705 C721 08 4712G 13W CAP DISC 470P 500V C334 C337 C...

Страница 62: ...nitor Service Guide rating originally used The components identified by the mark ofin the schematic are important safety parts If replacement is required refer to service manual to re adjust and or re checked the B and high voltage to reach the specified value ...

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