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IBM E74 Service Manual

Manual is about: COLOR MONITOR CHASSIS NO. : CA-119

Summary of E74

  • Page 1

    Color monitor service manual caution before servicing the unit, read the safety precautions in this manual. Model: e74 menu select chassis no. : ca-119.

  • Page 2

    1. Picture tube size : 17 inch defiection angle : 90° neck diameter : 29.1 mm dot pitch : 0.26 mm face treatment : w-arasc (anti-reflection and anti-static coating) low radiation : mpr ii 2. Signal 2-1. Horizontal & vertical sync 1) input voltage level : low=0~1.2v, high=2.5~5.5v 2) sync polarity : ...

  • Page 3

    Safety-related component warning! There are special components used in this color monitor which are important for safety. These parts are marked on the schematic diagram and the replacement parts list. It is essential that these critical parts should be replaced with the manufacturer's specified par...

  • Page 4

    Timing chart - 4 - h – 37.50 26.67 20.32 6.35 2.03 3.81 0.51 v – 74.99 13.335 12.802 0.533 0.080 0.427 0.026 h + 46.88 21.33 16.16 5.17 1.62 3.23 0.32 v + 75.01 13.331 12.798 0.533 0.064 0.448 0.021 h + 53.68 18.63 14.22 4.41 1.14 2.70 0.57 v + 85.07 11.755 11.178 0.577 0.056 0.503 0.018 h + 68.677 ...

  • Page 5

    Operating instructions - 5 - menu select front view rear view ac power socket signal connector id label power on/off button see front control panel front control panel 1. Power on/off button use this button to turn the monitor on or off. 2. Power indicator this indicator lights up green when the mon...

  • Page 6

    Wiring diagram - 6 - p501 p201 p405 p301 p302 g2 p702 p701 t1 p402 p902 s+ s signal cable ac socket fbt.

  • Page 7

    - 7 - disassembly (a) back cover cabinet (b) (c) 1 2 2 3 3 tip c b a tip spec. A(width) : 5.0~15.0mm b(depth) : 0.6~0.9mm c(height) : 12.0mm 1. Tilt/swivel & back cover removal 1) set the monitor face downward. 2) pull the latch (a), carefully remove the tilt/swivel by pulling it upward. 3) pressing...

  • Page 8

    Block diagram - 8 - power input 100~240vac (50/60hz) line filter degaussing circuit smps trans (t901) smps control (ic901) dpm control circuit voltage regulating circuit 105v 50v 13v 6.3v tilt control circuit 6.3v 13v e 2 prom (ic402) 5v osd ic (ic301) wt6805 h-sync sig v-sync sig i 2 c data(sda) i ...

  • Page 9

    Description of block diagram - 9 - 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...

  • Page 10

    - 10 - 15. 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 near the deflection yoke of the crt. 16. Video pre-amp circuit. This circuit amplifies the analog video signal from 0-0.7v to 0-4v. It is o...

  • Page 11

    - 11 - adjustment 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 tool...

  • Page 12

    - 12 - 14) set brightness and contrast to max position. 15) set sub-contrast 200(c8) (decimal) position. 16) set b-drive to 150(96) at drive of the alignment program. 17-1) 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 arro...

  • Page 13

    Troubleshooting guide - 13 - 1. No power no power (power indicator off) trouble in d900 trouble in fuse (f901) trouble in q901 trouble in d941, d942, d951, d961, d971 trouble in q903, q952, q951, q942, q941 check fuse ok? Check c908 voltage? (ac120v: 160vdc, ac220v: 304vdc) no yes yes yes yes no no ...

  • Page 14

    - 14 - 2. No character no character check ic302 pin 7(5v) ? Check ic302 pin 1, 3, 5? Check ic302 pin 14, 16, 18 ? Check ic303 pin 1, 2, 4 ? Check ic303 pin 7 (105v) pin 3 (13v) ? Trouble in p302 5v line trouble in pc signal, p301 signal cable trouble in ic302 trouble in p303 12v line/ 80v line troub...

  • Page 15

    - 15 - 3. No raster no video (power indicator on) check power indicator green or amber? Check d712 anode (-160v)? Check g1 voltage? (-55v~-15v) trouble in d712 trouble in q799 dpm mode (no h and/or v sync) amber no green yes no check cdt heat voltage? (6.3v) trouble in d941, q942, q941 yes no troubl...

  • Page 16

    - 16 - 4. No horizontal deflection no h-deflection (one vertical line) check q706? Check b+ voltage (50v)? Check t701(fbt) pin 2 (31khz 60v, 69khz 140v) ? Check q705 collector waveform? Trouble in q706 trouble in 50v line trouble in q719, q703, q704, d710 trouble in q705 trouble in t701, p701 no no ...

  • Page 17

    - 17 - 5. Trouble in h-linearity unbalanced of h-lin. Check ic401 pin 5, 6, 7 ? Check q711~q716? Check l703? Trouble in ic401 (micom) trouble in q711 ~ q716 trouble in l703 trouble in c722, c723, c726, c729 no no no yes yes yes cs signal table horizontal frequency(fh) 30k ~ 33.9k 34k ~ 38.9k 39k ~ 4...

  • Page 18

    - 18 - 6. No vertical deflection no v-deflection (one horizontal line) check ic601 pin 2 (13v+)? Check ic701 pin 23? Trouble in d610 13v line trouble in ic701 trouble in ic601, v-circuit no yes yes no 3v.

  • Page 19

    - 19 - 7. Trouble in osd trouble in osd peripheral circuit no osd trouble in 5v line trouble in ic601 pin1 (v-fbp), t701 40v line (h-fbp) trouble in ic302, ic301 trouble in ic301, ic302 no yes dc 5v yes yes yes no no no pin 5 5v pin 10 5v h+v 5v h+v check ic301 b+ (5v) ? Check ic301 pin 12 waveform ...

  • Page 20

    - 20 - 8. Trouble in dpm check ic401 (micom) pin 30, 31 (h/v input) signal? Check ic401 pin 13 waveform? Check ic401 (micom) pin 19, 27 ? Check b+ line (6.3v,13v+, 105v) ? Check pc, (pc is not going into dpm off mode) trouble in x401 trouble in ic401 (micom) trouble in q941, q942, q951, q952, troubl...

  • Page 21

    - 21 - 9. No degaussing check ic401 pin 1 (0v)? Check q953 collector voltage? Check p902 ? Check rl901? Trouble in ic401 (micom) trouble in q953 trouble in p902 trouble in rl901 trouble in th901, degaussing coil no degaussing dc 15v no no no no yes yes yes yes (degauss on the osd menu must be presse...

  • Page 22

    - 22 - 10. No tilt (no rotation ) no tilt (no rotation) trouble in ic401 ( micom) trouble in 15v line, 6.3v line trouble in q501~q503 trouble in p501, tilt coil no yes yes yes check 13v line and 6.3v line ? Check q503 emitter voltage ? No no check ic401 pin21 wave form ?.

  • Page 23

    Exploded view 8 b a 2 1 4 3 12 12 13 6 7 5 11 14 13 menu select 10 9 a b c b - 23 -.

  • Page 24

    - 24 - exploded view parts list ref. No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 a b a b c part no. 3091tkc061r 6318l17006b or 6318l17005b 3809tkc035u 3043tkk074h 339-002h 6140tc3004a 6174t11005a 6620tkb002a or 6620tkb002b 6850ta9009f 6871tst317f 4950tks169d 4930tkk031c 4810tkk171a 4810tkk204c 3313t17306a ...

  • Page 25

    - 25 - date: 2003. 3. 28. *s *al loc. No. Part no. Description / specification c201 0cn1040k949 0.1m 50v z f ta52 c301 0ck1040k945 0.1uf 50v z f tr c302 0ck1040k945 0.1uf 50v z f tr c303 0ck1040k945 0.1uf 50v z f tr c305 181-288c mkt 100v 224jtr phs 26224 c306 0ce107cf638 “100uf shl,sd 16v m fm5 tp ...

  • Page 26

    Date: 2003. 3. 28. *s *al loc. No. Part no. Description / specification c903 0czztcb003d bulk 7.5 cs e 102m 8.0 250v c904 0ckztta003a sc e 222m 10.0ff7 250v tp7.5 c905 0ckztta003a sc e 222m 10.0ff7 250v tp7.5 c906 0czztcb003d bulk 7.5 cs e 102m 8.0 250v c907 0ckztbu003c sc e 472m 14.0bw7 250v bk7.5 ...

  • Page 27

    Date: 2003. 3. 28. *s *al loc. No. Part no. Description / specification fb701 6210tce003l bas3580t bo sung 3580mm axia fb703 6210tce003b brs3580b bo sung 3580mm radi fb705 971-0016 tin hdc 0.60h fb903 6210tce003p brs2550b bo sung 2550mm radi fb904 6210tce003k bas3550t bo sung 3550mm axia fb905 6210t...

  • Page 28

    Date: 2003. 3. 28. *s *al loc. No. Part no. Description / specification r433 0rd1000q609 100 1/4w(3 5% ta52 r434 0rd1000q609 100 1/4w(3 5% ta52 r438 0rd1001q609 1k 1/4w(3 5% ta52 r439 0rd1001q609 1k 1/4w(3 5% ta52 r446 0rd1002q609 10k 1/4w(3 5% ta52 r447 0rd1001q609 1k 1/4w(3 5% ta52 r448 0rd1801q60...

  • Page 29

    Date: 2003. 3. 28. *s *al loc. No. Part no. Description / specification r916 0rd1002q609 10k 1/4w(3 5% ta52 r918 0rd1001q609 1k 1/4w(3 5% ta52 r923 0rd1003q609 100k 1/4w(3 5% ta52 r925 0rb0180k607 0.18ohm 2 w 5% ta62 r926 0rd4301q609 4.30k 1/4w(3 5% ta52 r927 0rd2002q609 20k 1/4w(3 5% ta52 r928 0rd1...

  • Page 30

    Pin configuration - 30 - stv6888 low-cost i2c controlled deflection processor for multisync monitors 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 1 7 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 h/ hv s y n vsyn h l ckvbk h p ll2 c co hg nd ro hpl l1f hposf hmoi rØ hf ly re fo ut bco mp bre g in bisen se ...

  • Page 31

    - 31 - h o ri zo nt al po si ti on s -co rr ect ion c -co rr e ct io n p in c u sh io n a sym m . Pa ra lle lo g ra m h o r. Dut y c ycl e h -m o ir Ø am p lit ud e v d yc or am pl it ud e b+ re f. V e rt ic a l si ze ve rt ic al po s it ion ve rti c a l mo ir Ø p in cu sh io n k e yst o n e to p co...

  • Page 32

    - 32 - stv9211 pin configuration pin description.

  • Page 33

    - 33 - block diagram stv9211.

  • Page 34

    - 38 - stv9556 1 2 3 4 5 6 7 8 9 10 11 out1 out2 out3 gndp gnda in3 v dd gnds v cc in2 in1 block diagram pin configuration.

  • Page 36

    - 36 - - 37 - printed circuit board 3. Main board (component side) 4. Main board (solder side) 1. Control board (component side) 2. Control board (solder side).

  • Page 37

    Apr. 2003 printed in korea p/no : 3828tso056c.