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Sampo 21T17 Service Manual

Summary of 21T17

  • Page 1

    Sampo service manual 21t17 1、 caution……………………………………………………………………… 2、 specification………………………………………………………………… 3、 bom list …………………………………………………………………… 4、 alignment procedure…………………………………………………… 5、 block diagram…………………………………………………………… 6、 schematic diagram……………………………………………………… 7、 pcb layout…………………………………………...

  • Page 2: Caution

    Warning: to reduce risk of fire or electric shock, do not expose this appliance to rain or moisture. Ca ution: to reduce the risk of electrical shock, do not remove cover (or back). No user serviceable par ts inside. Refer ser vicing to qualified service personnel. The lighting flash with arrowhead ...

  • Page 3: For Your Personal Safety

    3 for your personal safety 1. When the power cord or plug is damaged or frayed, unplug this television set from the wall outlet and refer servicing to qualified service personnel. 2. Do not overload wall outlets and extension cords as this can result in fire or electric shock. 3. Do not allow anythi...

  • Page 4

    4 protection and location of your set 11. Do not use this television set near water ... For example, near a bathtub, washbowl, kitchen sink, or laundry tub, in a wet basement, or near a swimming pool, etc. Never expose the set to rain or water. If the set has been exposed to rain or water, unplug th...

  • Page 5: Operation Of Your Set

    Operation of your set 18. This television set should be operated only from the type of power source indicated on the marking label. If you are not sure of the type of power supply at your home, consult your television dealer or local power company. For television sets designed to operate from batter...

  • Page 6

    14" 21" √ √ √ √ pal ntsc pal ntsc channels ac 90-240v, 50/60hz ac 110v, 50/60hz 14"-16" 21" √ √ tuner av stereo av mono av1 and av2 separate btsc treble bass balance auto volume level surround sound effects √ game auto standby if no signal in 15mins. √ sleep timer (10-120min) √ calendar √ ☆ biologic...

  • Page 7

    Remark: 2.Features in grey mean they are not available now . Child lock √ smart timer 1. Optional features are marked with ★. Red ★ means it will make cost up or down, blue ☆ means it is build-in tv, no additional cost up or down. Hotel mode √ ☆ (only in english) [no tuning menu/ max.Volume lock x-r...

  • Page 8

    Item no. Description qty. T8-dt17ag-ma1sm ass'y - skd parts`tw' 1 t8-21t17g-avy ass'y - av bd 1 40-21t18h-sib1x p.C.B. Side av bd 1 46-35146h-05x hs 5p24 550 tjc3-5y/scn-5y 1 p1104b p1 - p5 for m. Bd p904 47-rca020-xx1 rca socket y/w/r 1 p1101 t8-21t18g-iry ass'y - receive bd 1 02-irr002-xx1 ir rece...

  • Page 9

    13-00m24c-08p ic eeprom 8k m24c08 (write) 1 ic001 13-stv930-2bs ic stv9302b 1 ic301 13-0l7805-cvs +5v 1.5a ic l7805cv 1 ic402 13-0l7809-cvs ic l7809 sgs (to-220) 1 ic401 13-tda705-7as ic tda7057aq (2x8w) 1 ic601 18-cb0100-jnx res. C.F. 10 ohm 1/6w +/-5% 1 j217 18-cb0101-jnx res. C.F. 100 ohm 1/6w +/...

  • Page 10

    18-fg0153-jhx res. M.O. 15k ohm 2w +/-5% 1 r404 18-gj0332-jux1 res.C.C.5w 3.3kohm +/-5% 1 r402 18-rg0228-jhx res. Wire round 0.22 ohm 2w +/-5% 1 r620 25-bca102-m1x cap. Elec 1000 uf 16v +/-20% 1 c232 25-bcb100-m1x cap. Elec 10 uf 16v +/-20% 8 c004;c023;c025;c311;c603;c901;c902;c907 25-rcb100-m1x cap...

  • Page 11

    36-hdr001-ax1 transfor hor. Drive (magnetic core) 1 t401 41-wj0050-b00 wire bare jumper 5mm 1 l101 41-wj0055-b00 wire bare jumper 5.5 mm 1 j922 41-wj0060-b00 wire bare jumper 6mm 11 41-wj0065-b00 wire bare jumper 6.5mm 3 j010;j208;j301 41-wj0070-b00 wire bare jumper 7mm 4 j011;j012;j217a;j223 41-wj0...

  • Page 12

    10-79c10v-dbx diode zener 10v 1/2w 5% 2 10-cw574c-djx diode cw574cd 1 for c106 (diode“+” to gnd) 25-bfb220-m1x cap. Elec 22 uf 50v +/-20% 1 for d101 (capacitor“-” to gnd) t8-0a21sg-pw2 ass'y - power bd 1 10-00ru3c-fbx high efficiency rectifier ru3c 1 d831 10-0fr104-fbx diode fr104 (fast rectifier) 2...

  • Page 13

    26-abc471-jzx cap. Cer 470 pf 50v +/-5% sl 1 c851 26-aga221-krx cap.Cer 220pf 250v +/-10% 1 c830 26-ail103-kbx cap.Cer 10nf 500v +/-10% 2 c834;c805 26-akm221-krx cap. Cer 220 pf 1kv +/-10% 1 c833 26-amm102-krx cap. Cer 1000 pf 2kv +/-10% r 1 c815 26-apk222-me4 cap. Cer 2200pf 400vac+/-20% e 1 c816 2...

  • Page 14

    18-cb0103-jnx res. C.F. 10k ohm 1/6w +/-5% 3 r917;r010;r919 18-cb0223-jnx res. C.F. 22k ohm 1/6w +/-5% 6 r613;r612;r907;r908;r909;r910 18-cb0820-jnx res. C.F. 82 ohm 1/6w +/-5% 1 r929 18-ce0479-jnx res. C.F. 4.7 ohm 1/2w +/-5% 1 r918 25-bcb100-m1x cap. Elec 10 uf 16v +/-20% 2 c919;c920 25-bcb101-m1x...

  • Page 15

    18-cb0471-jnx res. C.F. 470 ohm 1/6w +/-5% 3 r525;r526;r527 18-cb0472-jnx carbon res. C.F. 4.7k ohm 1/6w +/-5% 3 r502;r505;r508 18-cb0681-jnx res. C.F. 680 ohm 1/6w +/-5% 1 r523 18-cb0751-jnx res. C.F. 750 ohm 1/6w +/-5% 3 r503;r506;r509 18-cd0104-jnx res. C.F. 100k ohm 1/4w +/-5% 1 r521 18-fe0272-j...

  • Page 16

    42-51216d-xx0 speaker (50mmx120mm) 16 ohm 5w 2 w601;w602 46-35196h-02x hs 2p22 570/7 tjc3-2y 1 p602h for m. Bd p602 46-14026h-02x hs 2p 2468#22 570mm s11-2y/7mm 1 p601h for m. Bd p601 54-113970-0u0 pvc tube awg no.5 0.32 for l & r speaking wire 54-114000-00x felt tape (150mmx19mmx0.3mm) 4 stick on f...

  • Page 17

    58-da41ri-6ui inlay rear av 1 58-dt17mp-jkt plate model no. 1 t8-hs36r0-a123 ass'y-remote 1 11-0bc337-0bx transistor (npn) bc337-40 1 q1501 13-00as12-13b ic as1213b 1 ic1501 14-ire05b-xx0 ir emitting diode tsal6200 1 d1501 18-cb0221-jnx res. C.F. 220 ohm 1/6w +/-5% 1 r1502 18-cb0229-jnx res. C.F. 2....

  • Page 18

    Alignment procedure of m123a color tv 1. Flowchart of alignment procedure 2 adjustment of b+ voltage 1) apply 120vac( ±5v) to mains power input, and philips standard testing pattern to rf input. 2) adjust vr830 in standard mode until voltage at tp2 (b+) is 108v ±0.5v. 3. Rf agc adjustment observe mo...

  • Page 19

    ③ use a color analyzer to measure the white side of the screen. By changing the value of gd, bd, set the reading of the color analyzer to x=285, y=295. ④ separately set the brightness and contrast from min. To max., repeat the step 2 and 3 until the reading of the color analyzer is correct. 3)alignm...

  • Page 20

    Factory settings d-mode: enter d-mode by pressing d-mode on/off key, and then you can enter the d-mode. S-mode: enter s-mode by pressing volume down key on the unit until the volume decrease to minimum level, then press the display key on the remote handset (don’t release the volume key) and you can...

  • Page 21

    Menu 4 (remote key: “4”) item remark cntx maximum contrast cntn minimum contrast brtx maximum brightness brtn minimum brightness colx maximum color coln minimum color tntx maximum tint level tntn minimum tint level menu 5(remote key: “5”) item remark brtc 50% brightness colc 50% color colp color lev...

  • Page 22

    Bit 3 bit 4 bit 5 tv，msp avl: 1: yes bit 6 av，msp avl：1:yes bit 7 mono+sap：1：yes 0：no bit 0 when blue background off (mute pin of cpu): 0: audio mute on 1: audio mute off bit 1 when blue background off (external mute pin of cpu): 0: audio mute on 1: audio mute off bit 2 when change channel: 0: pictu...

  • Page 23

    Menu 9(remote key: “9”) item remark v01 volume 1 v25 volume 25 v50 volume 50 v100 volume 100 volmax max volume under hotel mode curtcen center of the curtain volx output gain of pin28 of tmpa8823 or msp34x5 pwtm when use pwm to mute and no sound when changing channel, this item should be minimum as ...

  • Page 24

    Bit 7 bit 0 america v-chip standard 1：yes 0：no bit 1 canadian v-chip 1：yes 0：no bit 2 unrated，1：yes 0：no bit 3 no rating，1：yes 0：no mdoe8 bit 4 ~bit 7 time setting for curtain when turn on the set bit 0 ~bit 2 n/a bit 3 s-video ,0:parallel to av1 1: parallel to av2 bit 4 1:sound effect w/o mpx (msp3...

  • Page 25

    Bit 4 bit 5 bit 6 bit 7 slo f0 shift(test only) menu 14(remote key: “sleep) item remark hafc bit 1 ~ 0 afc gain (tv mode) [1ch, bit 5 ~ 4] bit 3 ~ 2 afc gain (av mode) [1ch, bit 5 ~ 4] agcc nois ontm v-mute timing when power on (01h = 16ms) nshp decreased level of sharpness when noise reduction is o...

  • Page 26

    Item remark m-col mild color m-bri mild brightess m-con mild contrast m-shp mild sharpness menu 20: no shortcut key item remark seg_point1 highest frequency of vhfl seg_point2 highest frequency of vhfh data_vl vhfl bandswitch（bb） data_vh vhfh bandswitch（bb） data_uf uhf bandswitch（bb） spe_pos1 the ch...

  • Page 27

    24v b r r +9 v u y y sif out cvbs/y e 2 prom 24c08 sda scl amp tda7057aq l r mcu+vcd tmpa8823 crt video amplifie horizontal output vertical output stv9302 tuner sawf +112v +12 +9v +5v 4052 av1 (video) av2 (video) msp3425 av1 (l,r) av2 (l,r) 27.

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  • Page 31

    Colour television chassis: m123a 31 fuse blown is the drain of q801 shorted to earth? Yes cheek / replace q801 is d815~d818 ok? Yes check ic801 and the peripheral components. Replace d815~d818 no no figure 1 fuse blown no raster abnormal + b is the + b, resistance to earth ok ? Check the load of b+ ...

  • Page 32

    Colour television chassis: m123a 32 no raster + b voltage ok is the voltage of in 25 of ic201 3.3v is the resistance to earth of pin25 if ic201 ok no yes is the h-out waveform at pin 13 of ic201 ok? Yes check the waveform at static working point of q401. Yes check q402 and lot no replace ic201 no ye...

  • Page 33

    Colour television chassis: m123a 33 yes symptom: raster ok, no picture, no sound, sparse noise dots apply the pointer of multimeter at r x 1 kΩ, connect one probe to gnd, use another to touch p42 of ic101. Are there interference particles flashing on the screen? Unsolder a pin of c110, apply the poi...

  • Page 34

    Colour television chassis: m123a 34 no yes is it mute at pin 1 of ic601? Yes no sound is the speaker replace the speaker apply the pointer of multimeter at rx1k Ω connect one probe to gnd, use another to touch p3, p5 of ic601, is there interference noise from the speaker. No check power supply of ic...

  • Page 35

    Colour television chassis: m123a 35 check p25, p49 of ic201 and the relative circuit no picture tv&av haven’t picture check rgb signal check +9v, +200v ok check q501~q503 check r516 ~ r521 etc. No ok replace ic201 tv has picture. Av hasn’t picture. Check the waveform of pin 14 of ic901 no q905 and i...

  • Page 36

    Colour television chassis: m123a 36 symptom: tuning control doesn’t work press stanby key on r/c. Can the tv be turn on and turn off? Does the channel number display on the screen? Yes no start auto- search. Is the bus ok? Yes after auto-search, can the searched program be memorized? Is the voltage ...

  • Page 37

    Colour television chassis: m123a 37 is there any change on the voltage level at p64 of ic201? No check the remote control receiver and transmitter. Yes is the vdd(+5v) at p9 and p55 of ic201 ok? Is there the 8mhz/5vp-p sine wave oscillations at p6 of ic201? Is the voltage at p5 of ic201 ok? Have p5 ...