TROUBLE SHOOTING CHARTS

Document Sample
TROUBLE SHOOTING CHARTS Powered By Docstoc
					TROUBLE SHOOTING CHARTS


                      NO POWER

                                                                          YES                  GO TO     A
             DOES QC701(POWER ON/OFF TR)
                      OPERATE?
                                                                          NO
                                                                                               GO TO     B

 A
                                                                CHECK
                                                                #30
                                                                (7.5V DC)
                                              R816 15K
                                              2WATT                                                  DOES
                                                                30                                   SHUT DOWN
                                                                                                     CIRCUIT
                                                                                                     OPERATE?
                                                                           I501
                                                                                        24
                      CHECK TP10       103VDC
                                                                26
                      (MAIN B+
                      LINE)
                                             IF #26 NORMAL
                                             & NO OUTPUT AT
                                             #23 THEN                      Q402
                                             CHANGE I501                   H. OUTPUT                    CHECK
                                                                                                        Q402
                                                                                                        COLLECTOR

                                                                D406
                                                12V                               12V        T402
                                                                                             F.B.T

                                             CHECK
                                             12V LINE
                                                                 D403                           103V(B+)

                                                                                                       CHECK
                                                                                                       ALL THE POINTS
 B                                                                                                     THEN CHANGE
                                                          NORMAL: 5V                                   I701
                                   QC706                  RESET: 0V
                                   RESET
          SHOULD                                16 I701                                  PWR
          BE                                                               36            CONTROL
          4.3V-5.2V                             12 LC864616A         42                  KEY

     5V
          Q802                                                             OPEN LOAD                   KEY OPERATE?
          REGULATOR                                                        THEN CHECK                  CHECK DIODE
                            R808                                           #42 ON STATE                D701 & SWITCH
                                                                           4 ~5V                       KEY BOARD
          CHECK
          F801                                               QC701
          125V 5A                     T801
                                                             POWER
                      CHECK                                  CONTROL
                      LEAD
                      SOLDERING

                             L801
                             LINE FILTER



                                                        12
          NO PICTURE
                                                               OK
         CHECK THE WAVE FORM OF                                                                      GO TO   C
         I501 #44 (2Vp-p)
                                                               NG
                                                                                                     GO TO    D

                                                                                                      H
C
                                      COMPOSITE                                     21
                           FC         VIDEO INPUT              FS         I501
                                                 H                       LA 7674
                                                                                              Y-OUT          QC501
                                                                                                             VIDEO
                                                                                                             DRIVE
                          QC201                                         42
                                                     C506

                        CONTRAST                                        39                                          CHECK
                                                                                                                    210V
    CHECK
    CONTROL              BRIGHT                                                                     H. BLANKING     KINE
                                                                        31
    (NORMAL)                                                             11 14
    VOLTAGES
    #39: 5.0V                                                                                  T402
                          D505         R522                                                    FBT           D404
    #31: 3.9V                          SUB-BRIGHT             CHECK
                          ABL
                                                              9V LINES                                               R413
                                                                                              ABL H.T
                                                              #11,14
                                                                             CHECK
                                                                             ABL                                     R412
                                                                             Ib = 1.2mA


D
                                              AGC                                                            CHECK
                                                                                                             HEATER
                                                                                                             6.3Vrms
         ENA                                                  9V
               DATA
                                   U101 TUNER             VT (33V)
                  CLK


                                                    5V
                                         IF

           I701
        LC864616A                                                   ADJUST
                                                                    RF-AGC
          10     11                                                 R113                 DETECTOR
                                                                                         OUTPUT

                                    Z101                  8                    10
                                    SAW FILTER            9          I501                44                              TO QC201
                                                                    LA7674
    CHECK                              CHECK                        2               11 14
    CSB503E                            IF AGC
                                       VTG.                                                                          H
                                       5VDC
                                       TP2
                                                                                    CHECK
                                                                                    9V LINE
                                                                                    #11, 14




                                                         13
    NO SOUND(CN-200I)
      CHECK FOR SIGNAL                                                                  GO TO   E
      AT I501 #1

                                                                                        GO TO   F




E             CHECK               #1
         MONO 100% MOD
         -> 0.424 Vp-p            #2 9V(B+)
                                          I601




                                                         #19
                                                                  CHECK 1Vp-p
             CHECK                #12                    #18
           EXT SOUND
          SIGNAL OFF:L            #13         (MUTE)#17           MUTE ON: 5V
                                                                       OFF: 0V


                                  #1 9V(B+)    #4
                                                           CHECK 1Vp-p
                                  #2(0~5V) #6
                                       I602

                                  #8(0~5V)




                                               #7          CHECK 12VDC
                                   I604/I603
        CHECK SOUND INPUT         #3           #6

                                               #5          CHECK SOUND OUTPUT



F

                            #11                     #1    COMPOSITE SIGNAL
              CHECK 9V                                                        I601 #1
                            #14

                            #44     I501
                                   LA7674

                                                    #4         CHECK FM DET
                                                               CIRCUIT
                  Z201      #48


                         CHECK SOUNDIF INPUT




                                         14
    NO SOUND(CN-200A)
      CHECK FOR SIGNAL                                                                       GO TO   E
      AT I501 #1

                                                                                             GO TO   F




E
                                     #38                #22

                  CHECK              #30 9V(B+)         #21           CHECK 4.5V
             MONO 100% MOD                              #20
                                     #2(9VDC)
             -> 0.693 Vp-p
                                            IM601

                                                                  L OUT
                                                            #15           CHECK R/L OUTPUT
                                                                  R OUT
                                     #39                    #13
                  CHECK 4.5V         #40         (MUTE)#8                 MUTE ON: 5V
                                                                               OFF: 0V



                                     #1 9V(B+)    #4
                                                              CHECK 1Vp-p
                                     #2 (0~5V) #6
                                          I602

                                     #8 (0~5V)




                                                  #7          CHECK 12VDC
                                      I604/I603
        CHECK SOUND INPUT            #3           #6

                                                  #5          CHECK SOUND OUTPUT



F

                               #11                     #1    COMPOSITE SIGNAL
              CHECK 9V                                                           I601 #1
                               #14

                               #44     I501
                                      LA7674

                                                       #4         CHECK FM DET
                                                                  CIRCUIT
                  Z201         #48


                     CHECK SOUND IF INPUT




                                           15
      CH DON'T STOP

           CHECK INPUT SIGNAL                        GOOD                          GO TO      G
           CONDITIONS
                                                      BAD                 LOSS OF SIGNAL OR
                                                                          WEAK SIGNAL



G

                                IF OUTPUT
                                                            8, 9 I501
          U101                                                   LA7674
          TUNER
                        CHECK                                                45
                        AFT WINDOW          ADJUST
                                            RF AGC                                         AFT
                        VTG.                                10               46
                        1.6V ~ 3.4V         R113
      2    3   4
                                                                              9
                                                                                           PIF
                                                                              8
                   13                                       47
    I701
    LC864616A
                                                                                      ADJUST
                                                                                      PIF & AFT
                   33                                                                 REFER TO GENERAL
                                       L: NO SIGNAL                                   ADJUSTMENTS
                                       H: SIGNAL




                                                            44




                                               S.D SIGNAL
                                               DETECTION




                                               16
    NO COLOR

                                                         CHECK
                                                         9VDC
                       CENTER
                        3.5V

                                                         11
            TINT                           41

                                                                       12                      APC FILTER
        COLOR                              36
                                                                                 X502
                                                                       13
                        CENTER
                          4V                           I501
                                                                                                     CHECK
                                                       LA7674
                                                                                                     CRYSTAL
                                                                                  CHECK              3.579545MHZ
COMPOSITE                                                                         9VDC
VIDEO              C506
                                           42                          14
                                                                                   R-Y
                                                                       18                                   Q901          R
                        FS
                                                                                   G-Y
                                                                       19                                   Q902          G
             QC201
             Emitter                                                               B-Y
                                                                       20                                   Q903          B


                                                                                                                              +
       FC                                                                        LUMINANCE (-Y)                     VIDEO B (210V)
                                                                       21
                                                                                            CHECK
                                                                                            CONNECTOR
                                                                                            P901

NO VERTICAL DEFLECTION

                              CHECK 9VDC                               CHECK 9VCC


                14                     CHECK
                                       VERT.OUT
                                                                 1
    I501
                                                                             I301
    LA7674
                                                                             LA7837
                                                                                                        CHECK 25VDC
                28                                               2
                                                                 4          12          8
                                      R301
                                                        R304                                           D402        R417

                             VR305 V,HEIGHT              R305
                                                                                        C413

                                                                     C307                               C417
                                                R311             +
                                                                                        CHECK THE WAVEFORM
                                                                 V.D.Y.                 I301 #12 NO OUTPUT:
                                                                                        CHANGE IC301




                                                                 17
ON SCREEN DISPLAY DOES NOT OPERATE



                  CHECK
                  FOR,60Hz

   / VS                       19              21
                                                                   R

                                                                   G         R, G, B, BL
                                              22                             CHANGE
   / HS                       20    I701                           B
                                              23
                                                                   BL
                                              24
                                                                        IF OSD DOES NOT
                              10             11                         OPERATE, CHANGE
                                                                        I701
          CHECK
          FOR, 15, 734Hz
                                                       OSC CHECK




REMOTE CONTROL DOES NOT OPERATE


                            IL01
                            REMOCON
                            SENSOR

                           GND 5V OUT




                                           CHECK
                                           WAVE-
                                           FORM




                                             34
                           I701 LC864616A




                                                  18
PIN ASSIGN OF IC LC864616A(I701)



 VIDEO MUTE(O)   1 P10                           P07 42 POWER(O)
                                                            KEY OUT
      DATA(O)    2 P11                           P06   41
                                                            KEY OUT
     CLOCK(O)    3 P12                           P05   40
                                                            KEY OUT
    ENABLE(O)    4 P13                           P04   39
                                                            KEY IN
SOUND MUTE(O)    5 P14                           P03   38              3-LAN    SAP     TV/VID
                                                            KEY IN
   TV/VIDEO(O)   6 P15                           P02   37             MN/ST             EEPROM
                                                            KEY IN
      MPX1(O)    7 P16                           P01   36             CH UP    VOL +    POWER
                                                            KEY IN
      MPX2(O)    8 P17                           P00   35             CH DN    VOL -    MENU

                 9 DVss                P73/INT3/TOIN   34 REMOCON(IN)                  : Switch

                 10 CF1                P72/INT2/TOIN   33 SD(IN)                       : Option
                                                                                         Diode
                 11 CF2                     P71/INT1   32 X-Ray IN

                 12 DVdd                    P70/INT0   31 AC 60Hz IN


        AFC IN   13 P90/AN0                     PWM5   30 CONTRAST


          N. C   14 P91/AN1                     PWM4   29 BRIGHTNESS


          N. C   15 P92/AN2                     PWM3   28 COLOR


                 16 /RESET                      PWM2   27 TINT

                 17 FILT                        PWM1   26 SHARPNESS

       1Vpp IN
                 18 CVIN                        PWM0   25 VOLUME

                 19 /VS                           BL   24

                 20 /HS                           B    23

                 21 R                             G    22



                  NOTE) CF is used 503KHz RESONATOR




                                           19