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1. picture tube size : 17 inch (flat slot mask) defiection angle : 90 neck diameter : 29.1 mm phosphor : p22 slot pitch : 0.24 mm low radiation : tco-99 face treatment : w-arasc (anti-reflective and anti-static coating), internal anti-glare 2. signal 2-1. horizontal & vertical sync 1) input voltage level : low= 0.8v, high= 2.1v 2) sync polarity : positive or negative 2-2. video input signal 1) voltage level : 0 ~ 0.7 vp-p a) color 0, 0 : 0 vp-p b) color 7, 0 : 0.467 vp-p c) color 15, 0 : 0.7 vp-p 2) input impedance : 75 ? 3) video color : r, g, b analog 4) signal format : refer to the timing chart 2-3. signal connector 15 pin d-sub connector 2-4. scanning frequency horizontal : 30 ~ 96 khz vertical : 50 ~ 160 hz 3. power supply 3-1. power range ac 100~240v (auto select), 50/60hz, 2.0/1.0a max. ac 200~240v 50hz 1.5a (pfc version) 3-2. power consumption 4. display area 4-1. active video area : ?max image size - 325.4 x 244.1mm (12.91" x 9.61") ?preset image size - 310 x 230 mm (12.20" x 9.06") 4-2. display color : full colors 4-3. display resolution : 1600 dots x 1200lines 4-4. video bandwidth : 203mhz 5. environment 5-1. operating temperature: 10? ~ 35? (50? ~ 95?) (ambient) 5-2. relative humidity : 8% ~ 80% (non-condensing) 5-3. altitude : 10,000 ft 6. dimensions (with tilt/swivel) width : 415.0 mm (16.34") depth : 439.0 mm (17.28") height : 435.0 mm (17.13") 7. weight (with tilt/swivel) net weight : 19.2 kg (42.33 lbs) gross weight : 22.7 kg (50.05 lbs) 8. usb specifications (option) usb standard : rev. 1.0 complied self-powered hub downstream power supply : 500ma for each (max) communication speed : 12 mbps (full), 1.5 mbps (low) usb port : 1 upstream port 4 downstream ports specifications - 2 - mode normal (on) stand-by suspend off h/v sync on/on off/on on/off off/off power consumption less than 110w less than 8w less than 8w less than 3w led color green orange orange
- 30 - 5. control board (component side) 6. control board (solder side)
- 29 - 3. video board (component side) 4. video board (solder side)
- 28 - 2. main board (solder side)
printed circuit board - 27 - 1. main board (component side)
exploded view exploded view parts list ref. no. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20-1 20-2 21 a b c part no. 3091tkc030n 3091tkc030q 2423gc3e41a 6868t17004b 339-002h 4951tks054a 6140tc2010a 6174t11002d 6200tjb003b 4951tkk028b 6871tut005b 4810tkm034c 332-102g 4951tkk014a 6871tct080a 6871tst142a 6871tpt098a 4815tkt006c 3809tkc032a 3809tkc032b 3809tkc032d 3809tkc032e 332-122b 3550tkk061a 3550tkk061b 3043tkk040j 6871tvt140a 6871tmt143a 6871tmt143c 6871tmt143f 6871tmt143g 3313t17037a 3313t17037c 3313t17037g 3313t17037h description cabinet ass y fb795c brand c027 usb (fb795c u), (fb795c p) cabinet ass y fb795c brand 027 non-usb (fb795c q), (fb795c e) cdt, m41qbf423x 11n6ld cdt earth screw ass?, php+5x20+gw18 metal assy, frame fg793c coil,degaussing, 2600mm 13 ohm 0.5mm 90t 17" fs782c fbt (fly back transformer), y268111(hfl1127rd) hitachi 17" filter(circ),emi bns-02aa2lr-3 bae eun cb995c metal assy, rear fb795c pwb(pcb) assy,usb cb995c usb total assy (fb795c u), (fb795c p) bracket, fb795c main b-core screw, ptp 4*30 fzmw metal assy, base fb795b pwb(pcb) assy,composite, fb795c etc brand xigu total pwb(pcb) assy,sub, fb795c xigu brand control total pwb(pcb) assy,power, fb795c pfc 10t xigp brand ca-75 total (fb795c p) shield assy, top fb795c back cover assy, fb795c 031 c-core slim (fb795c e) back cover assy, fb795c 031 d-core slim (fb795c u) back cover assy, fb795c 031 pfc d-core (fb795c p) back cover assy, fb795c 031 pfc c-core (fb795c q) screw, tp1+m4*16(fzmy1) cover fb795b screw right cover fb795b screw left tilt swivel assy, fb775b b029 t032 hips 85964 pcb ass?, video total pwb(pcb) assy,mai n fb795c xigu brand main total (fb795c u) pwb(pcb) assy,mai n fb795ce xlve brand ca-75 total (fb795c e) pwb(pcb) assy,mai n fb795c pfc xigp brand ca-75 total (fb795c p) pwb(pcb) assy,mai n fb795c_pfc xpve brand ca-75 total (fb795c q) main total assy, fb795c brand total assy (fb795c u) main total assy, fb795ce brand ca-75 (fb795c e) main total assy, fb795c pfc brand ca-75 (fb795c p) main total assy, fb795c_pfc brand ca-75 (fb795c q) 1 2 3 12 16 21 14 13 15 17 19 18 4 5 6 a b c 20-2 20-1 7 9 10 8 11

wiring diagram - 10 - anode cap p403 p402 p401 p106 p202 p201 p701 p301 p302 p906 p901 p304 p902 cdt earth convergence pin degaussing coil purity coil tilt coil dy-pin p102 p308 dy assembly screw p702
block diagram - 14 - power input 100~240vac (50/60hz) line filter degaussing circuit < osd control > smps trans (t901) smps control (ic901) dpm control circuit 190v 23v -12v -12v 125v 80v 15v 12v 6.3v tilt control circuit 6.3v 6.3v 12v 5v e 2 prom (ic402) h / v position h / v size spcc trapizode pin balance parallelogram tilt cornertrap ddc on/off clamp beep recall degauss color control moire language video level osd position purity convergence 5v osd ic (ic301) h-sync sig v-sync sig i 2 c data(sda) i 2 c clock(scl) video pre-amp (ic302) signal cable r g b video main amp (ic303) 12v cut off control 125v 8v 5v h/v sync processor ( ic701 ) tda4856 v-out ( ic601) tda8172 h-out ( q708) h-linearity correction dc/dc converter x-ray protection circuit fbt ( t701 ) dynamic focus circuit auto beam limit vertical blanking, brightness control -120v 30v 900v h.v control dummy trans 12v 15v micom (ic401) scl / sda h/v sync, pwm control sig 12v 15v -12v 190v dy cdt heater ( 6.3v ) i 2 c i 2 c i 2 c i 2 c i 2 c h/v sync g 1 screen dynamic focus static focus h.v r/g/b bias r/g/b contrast h-drv b-drv 15v 15v tilt coil coil degaussing coil i 2 c voltage feedback voltage feedback subtrans control (ic903) sub trans t903 purity control circuit purity h- conver gence brightness contrast
description of block diagram - 15 - 1. line filter & associated circuit. this is used for suppressing noise of power input line flowing into the monitor and/or some noise generated in this monitor flowing out through the power input line. that is to say, this circuit prevents interference between the monitor and other electric appliances. 2. degauss circuit & coil. the degauss circuit consists of the degaussing coil, the ptc (positive temperature coefficient) thermistor (th901), and the relay (rl901). this circuit eliminates abnormal color of the screen automatically by degaussing the slot mask in the cdt when turn on the power switch. when you need to degauss while using the monitor, select degauss on the osd menu. 3. smps (switching mode power supply). this circuit works with power of 110-240vac (50/60hz). the operation procedure is as follows: 1) ac input voltage is rectified and smoothed by the bridge diode (d901) and the capacitor (c907). 2) the rectified voltage (dc voltage) is applied to the primary coil of the transformer (t901). 3) the control ic (ic901) generates switching pulse to turn on and off the primary coil of the transformer (t901) repeatedly. 4) depending on the turn ratio of the transformer, the secondary voltages appear at the secondary coil of the transformer (t901). the switch ic(ic903) contrals input-pulse-width and generates secondary voltage by sub-transformer (t903). 5) these secondary voltages are rectified by each diode (d906, d907, d908, d909, d910, d911, d912, d913) and operate the other circuits. (deflection, video amplifier, etc.) 4. display power management circuit. this circuit control power consumption of the monitor by detecting h and v sync signal. there are stand-by and suspend mode. when no horizontal or vertical sync signal input, the circuit consists of q930 and q931 becomes stand-by and suspend mode. it s power consumption is below 8w. when no horizontal and vertical sync signal input, it s power consumption is below 3w. 5. x-ray protection. this circuit detects the rectified dc voltage comes from the fbt pin 4. if the high voltage of the fbt reaches up to about 30kv (abnormal state), micom(ic401) detects. it stops b + voltage supplied to the fbt (t701), and high voltage is not be generated, (in the normal state, the high voltage is about 26kv.) 6. micom(microprocessor) circuit. the operating procedure of micom (microprocessor) and its associated circuit is as follows: 1) h and v sync signal is supplied from signal cable to the micom (ic401). 2) the micom (ic401) distinguishes polarity and frequency of h and v sync. 3) the micom controls each osd function signals. (h-size, h-position, v-size, etc.) 4) the controlled data of each mode is stored in ic402. user can adjust screen condition by each osd function. the data of the adjust screen condition is stored automatically. 7. horizontal and vertical synchronous processor. this circuit generates the horizontal drive pulse and the vertical drive pulse by taking sync-signal from signal cable. this circuit consists of the tda4856(ic701) and the associated circuit. 8. d/d (dc to dc) converter. this circuit supplies dc voltage to the horizontal deflection output circuit by decreasing dc 190v which is the secondary voltage of the smps in accordance with the input horizontal sync signal. 9. d/d drive & convert circuit. this circuit is used for supplying b + voltage to horizontal deflection output transistor (q709). this circuit makes to add side-pincushion correcting signal to b + voltage. 10. horizontal deflection output circuit. this circuit makes the horizontal deflection by supplying the saw-tooth current to the horizontal deflection yoke.
- 16 - 11. high voltage output & fbt (flyback transformer). the high voltage output circuit is used for generating pulse wave to the primary coil of the fbt (flyback transformer (t701)). a boosted voltage (about 26kv) appears at the secondary of the fbt and it is supplied to the anode of the cdt. and there are another output voltages such as the dynamic focus voltage. 12. h-linearity correction circuit. this circuit corrects the horizontal linearity for each horizontal sync frequency. 13. vertical output circuit. this circuit takes the vertical wave from the tda4856 (ic701) and performs the vertical deflection by supplying the saw-tooth wave current from the tda8172 (ic601) to the vertical deflection yoke. 14. dynamic focus output circuit. this circuit takes h and v parabola wave from the tda4856 (ic701), and amplifies these waves to offer to the fbt (t701). 15. vertical blanking and brightness control. this circuit eliminates the retrace line by supplying a negative pulse to the g1 of the cdt. the brightness control circuit is used to control of the screen brightness by changing the dc level of g1. 16. image rotation (tilt) circuit. this circuit corrects the tilt of the screen by supplying the image rotation signal to the tilt coil which is attached to the cdt near the deflection. 17. static convergence control circuit. this circuit corrects the convergence of the screen by supplying the convergence signal to the 4h (stc) coil which is attached to the cdt near the deflection. 18. moir? reduction circuit this circuit reduce interference between the periodical display pattern and the cdt's slot (or dot). the positions of every other one dot video signal beams (red, green, and blue beam) are shifted finely, thus reducing interference. 19. osd circuit. this circuit is used for performing the osd (on- screen- display) function. when a user selects the osd select/adjustment control, the adjustment status displays on the screen. 20. video pre-amp circuit. this circuit amplifies the analog video signal from 0- 0.7v to 0-4v. this circuit is operated by taking the clamp, r, g, b drives, and contrast signals from the micom (ic401). 21. video output amp circuit. this circuit amplifies the video signal which comes from the video pre-amp circuit and amplified video signal is applied to the cdt cathode.
troubleshooting guide - 19 - 1. no power no power (power indicator off) trouble in d901 trouble in fuse (f901) trouble in ic903 trouble in d921, d922, d931, d924, d925, d926 trouble in ic911 check fuse ok? check c907 (+) voltage? (390vdc) no yes yes yes no no no check ic903 pin 3 waveform come out? check d921, d922, d931, d924, d925, d926 voltage? trouble in ic901 check ic901 pin 3 waveform come out? yes no yes
- 20 - 2. no character check ic302 pin 3, 8, 12 (12v), pin 17 (5v)? check ic302 pin 2, 6, 11 ? check ic302 pin 29, 32, 35 ? trouble in p302, 5v, 12v line trouble in pc signal, signal cable trouble in ic302 trouble in cdt socket no yes no no yes yes check r, g, b cathode voltage? trouble in ic303 no yes no character
- 21 - 3. no raster no video (power indicator green or orange) check power indicator green or orange ? check screen control knob of fbt check voltage at d912 cathode (190v) d909 cathode (85v) ic911 out (12v) d906 cathode (6.3v)? check ic401 (micom) pin 11 5v (high), ic701 pin 10 12v (high)? rotate screen control knob to clockwise trouble in ic401 (micom), ic701 trouble in cdt socket, board trouble in primary circuit of t901 trouble in p302 signal cable orange min. (counter-clockwise) green ok yes no yes no
- 22 - 4. no vertical deflection no v-deflection (one horizontal line) check ic601 pin 2 (15v) ? check ic601 pin 4 (-12v)? trouble in t901 pin 15 trouble in t901 pin 16 trouble in ic601, v-circuit no no yes yes check ic701 pin 12, 13 (sawtooth wave)? trouble in ic701 no yes
- 23 - 5. trouble in dpm check ic401 (micom) pin 8, 9 (h/v input) signal? check ic401 pin 13, 14 waveform? check ic401 pin 11 (5v, high)? check ic401 pin 19, 21 ? check pc, (pc is not going into dpm mode) trouble in x401, ic401 trouble in ic401 trouble in ic401 trouble in t901 or pc no h / v sync signal input h/v sync no no no dpms table mode item normal stand-by suspend off h / v sync on / on off / on on / off off / off led green orange orange orange video normal off(0v) off(0v) off(0v) yes yes check b + line (12v, 15v, 80v, 5v) ? trouble in ic911 no yes stand-by/suspend/ off mode failure
- 24 - 6. no degaussing check ic401 pin 20 (5v)? check q908 collector voltage (0.5v)? check p903? check rl901? trouble in ic401 (micom) trouble in d914 trouble in p901 trouble in rl901 trouble in th901, degaussing coil no degaussing ( button must be pressed.) no no no no yes yes yes yes
- 25 - 7. no tilt (rotation ) trouble in p202, tilt coil connector, tilt coil no tilt (rotation) trouble in d913 trouble in q315 check r213 voltage (12v) ? no yes yes check q202 ? no trouble in ic401 yes check ic401 ? no
- 26 - 8. trouble in osd check ic301 pin 5 (negative h-pulse comes in ?) check ic301 pin 18 (negative v-pulse comes in?) check ic301 pin 8, 7 (is there any signal when operating front control ?) no osd trouble in ic302 trouble in p302 trouble in p302 trouble in ic301, ic401 yes yes yes no no no check ic301 pin 4, 17 (5v) ? trouble in p302 no yes
adjustment - 17 - general information all adjustment are thoroughly checked and corrected when the monitor leaves the factory, but sometimes several adjustments may be required. adjustment should be following procedure and after warming up for a minimum of 30 minutes. alignment appliances and tools. - ibm compatible pc. - programmable signal generator. (eg. vg-819 made by astrodesign co.or equivalent) - eprom or eeprom with saved each mode data. - alignment adaptor and software. - digital voltmeter. - white balance meter. - luminance meter. - high-voltage meter. automatic and manual degaussing the degaussing coil is mounted around the cdt so that automatic degaussing when turn on the monitor. but a monitor is moved or faced in a different direction, become poor color purity cause of cdt magnetized, then press (degaussing) on the osd menu. adjustment procedure & method - install the cable for adjustment such as figure 1and run the alignment program on the dos for ibm compatible pc. 1. adjustment for b + voltage. 1) display cross hatch pattern at mode 2. 2) adjust c913 ( + ) voltage to 190 0.2v with vr901 . 2. adjustment for high-voltage. 1) display cross hatch pattern at mode 2. 2) adjust cdt anode voltage to 26 0.2kv with vr701 . 3. adjustment for horizontal raster center. 1) display cross hatch pattern at mode 2. 2) adjust the raster should be center of the screen with sw701. 4. adjustment for factory mode (preset mode). 1) display cross hatch pattern at mode 2. 2) run alignment program for flatron 795ft( plus), fb795c on the ibm compatible pc. 3) eeprom all clear y(yes) command. 4) dist. adj. 5) command preset start y(yes) command. 6) adjust tilt as arrow keys to be the best condition. 7) dist. adj. balance command. 8) adjust balance of pin balance, key balance, v s linearity, v c linearity, top corner correction and bottom corner correction as arrow keys to be the best condition. 9) dist. adj. fos. adj command. 10) adjust h-size as arrow keys to 310 2mm. 11) adjust h-position as arrow keys to center of the screen. 12) adjust v-size as arrow keys to 230 1mm. 13) adjust v-position as arrow keys to center of the screen. 14) adjust s-pcc (side-pincushion) as arrow keys to be the best condition. 15) adjust trapezoid as arrow keys to be the best condition. 16) adjust tilt as arrow keys to be the best condition 17) display from mode 1) to mode 12). 18) preset exit y (yes) command. 5. adjustment for white balance and luminance. 1) set the white balance meter. 2) press the (degaussing) on the osd menu for demagnetization of the cdt. 3) display color 0,0 pattern at mode 8. 4) set brightness and contrast to max position. 5) color adj. bias adj. command of the alignment program. 6) check whether blue color or not at r-bias and g- bias to min position and b-bias to 130 (decimal) position at sub-bright max. if it's not blue color, the monitor must repair.
- 18 - figure 1. cable connection 220 monitor to be adjusted ibm compatible pc parallel port power inlet (required) power led st switch power select switch (110v/220v) control line not used rs232c parallel v-sync power st vgs monitor e v-sync on/off switch (switch must be on.) f a b c e f a b c 15 10 5 5 6 9 1 1 1 14 13 25 6 5v 5v 5v 4.7k 4.7k 4.7k 74ls06 74ls06 off on off on 11 video signal generator 7) adjust screen control on the fbt to 0.15 0.02fl of the raster luminance. 8) adjust r-bias and g-bias command to x=0.283 0.006 and y=0.298 0.006 on the white balance meter with pc arrow keys. 9) adjust sub-brightness command to 0.25 ~ 0.35fl of the raster luminance. 10) display color 15,0 box pattern (70x70mm) at mode 2. 11) set sub-contrast to 190 (decimal). 12) drive adj command. 13) set b-drive to 150 (decimal) at drive of the alignment program. 14) adjust r-drive and g-drive command to white balance x=0.283 0.003 and y=0.298 0.003 on the white balance meter with pc arrow keys. 15) adjust sub-contrast command to 50 1fl of the box pattren (70x70 mm). 16) display color 15,0 full white patten at mode 10. 17) color adj. luminance abl command. 18) set the brightness and contrast to max position. 19) adjust abl to 31 1fl of the luminance. 20) exit from the program. 6. adjustment for focus. 1) display h character in full screen at mode 10. 2) adjust two focus control on the fbt so that focus should be the best condition.
disassembly - 11 - (a) (a) 3. top shield removal 1) remove four screws (a). 2) remove four screws (b). 3) remove two screws (c). 4) remove three screws (d). 2. back cover removal 1) remove four screws (a) from the back cover. 2) slide the back cover away from the front cabinet of the monitor. (a) (b) (b) (b) (b) (d) (d) (c) (c) (a) (a) (a) (a) 1. tilt/swivel removal 1) set the monitor face downward. 2) pressing the latch (a), carefully remove the tilt/swivel by pulling it upward.
- 12 - 6. bottom bracket removal 1) remove five screws (a). 2) remove the bottom bracket. (a) (a) (a) (a) purity coil tilt coil anode cap p403 p402 p401 p202 p201 p701 p906 p901 p304 l701 p902 cdt earth degaussing coil dy-pin p301 p302 p308 (a) (a) (a) (a) 4. total chassis assembly removal 1) disconnect p901 (degaussing pin), p701 (dy pin), p202 (tilt pin), and p201 (purity pin) from the main pcb. 2) disconnect p306 (gnd wire), p304 from the video pcb. 3) carefully separate the cdt board assembly from the cdt neck. 4) discharge the remaining static electricity by shorting between the anode cap and the cdt ground. 5) disconnect the anode cap from the cdt. 6) remove four screws (a). 7) remove the total chassis assembly from the main frame. bottom bracket
- 13 - (b) (b) (d) (d) (a) (a) (a) (a) (a) (a) (a) main bracket control pcb ass y usb ass y 7. main bracket & control pcb ass? removal 1) remove eight screws (a). 2) remove two screws (b). 3) carefully remove the interface assembly from the main pcb board. 4) remove the control pcb assembly from the main bracket. 5) release four latches (d) from the main board assembly. 6) remove the bottom bracket.
control locations - 9 - control pcb main pcb 1 2 3 4 5 6 8 9 7 10 no . 1 2 3 4 5 no . 6 7 8 9 10 ref. no. sw131 ref. no. vr901 sw701 vr701 control function power switch set button osd select/adjustment (right) osd select/adjustment (up) osd select/adjustment (down) control function osd select/adjustment (left) osd button b + adjustment raster center select high-voltage adjustment
timing chart - 4 - video sync c e d f a b << horizontal frequency (khz) , vertical frequency (hz) , horizontal etc... (s) , vertical etc... (ms) >> 1 2 3 4 5 6 7 8 9 10 11 12 h 31.469 31.778 25.422 6.356 3.810 1.906 0.640 v + 70.082 14.270 12.713 1.557 0.064 1.080 0.413 h 31.469 31.778 25.422 6.356 3.813 1.907 0.636 v 59.940 16.683 15.253 1.430 0.064 1.049 0.318 h 43.269 23.112 17.778 5.334 1.556 2.222 1.556 v 85.008 11.763 11.093 0.670 0.069 0.578 0.023 h 49.725 20.111 14.525 5.586 1.117 3.910 0.559 v 74.550 13.414 12.549 0.865 0.061 0.784 0.020 h + 53.674 18.631 14.222 4.409 1.138 2.702 0.569 v + 85.061 11.756 11.178 0.578 0.056 0.503 0.019 h + 60.023 16.660 13.003 3.657 1.219 2.235 0.203 v + 75.029 13.328 12.795 0.533 0.050 0.466 0.017 h + 68.677 14.561 10.836 3.725 1.016 2.201 0.508 v + 84.997 11.765 11.183 0.582 0.044 0.523 0.015 h 68.681 14.560 11.520 3.040 1.280 1.440 0.320 v 75.062 13.322 12.667 0.655 0.044 0.567 0.044 h + 77.487 12.905 9.481 3.424 1.053 1.844 0.527 v + 85.057 11.757 11.150 0.607 0.039 0.555 0.013 h + 79.976 12.504 9.481 3.023 1.067 1.837 0.119 v + 75.025 13.329 12.804 0.525 0.038 0.474 0.013 h + 91.146 10.971 8.127 2.844 1.016 1.422 0.406 v + 85.024 11.762 11.235 0.527 0.033 0.483 0.011 h + 93.750 10.666 7.901 2.765 0.948 1.501 0.316 v + 75.000 13.333 12.800 0.533 0.032 0.490 0.011 720x400 70hz 640x480 60hz 640x480 85hz 832x624 75hz 800x600 85hz 1024x768 75hz 1024x768 85hz 1152x870 75hz 1152x864 85hz 1280x1024 75hz 1280x1024 85hz 1600x1200 75hz mode h/v sort sync polarity frequency total period (e) video active time (a) blanking time (b) sync duration (d) back porch (f) front porch (c) resolution
- 31 - 7. usb board (component side) 8. usb board (solder side)

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