DAEWOO cp420 Diagram
RTV servis Horvat
Tel: ++385-31-856-637
Tel/fax: ++385-31-856-139
Mob: 098-788-319
www.rtv-horvat-dj.hr
10. TROUB LE SHOO TING CHARTS
10-1. NO RASTER
CHECK MAIN B+ ( 123V LINE )
NG.
I806 6Vout ?
Q803 BASE = H ?
NG.
SW08,P803 SOLDER ?
TOP210 PIN VOLT ?
D825~D828,F801,R803 ?
NG.
XN01,XN02,X701 OSC ?
RN46,47,48'S PULSE ?
IN01,I701 RESET = H ?
NG.
DECK SEPERATION
OK
DECK EXCHANGE
NG
CHECK I801 #9 VOLT
I801 #7, #1 VOLT
CHECK R817,D801~D804
EXCHANGE I801
OK
PA805 VCR H = H ?
OK
PA406 MON. ON = H ?
NG.
I701 EXCHANGE
NG
CHECK T801 SECONDARY
VOLTAGE 8.5V,14V,13.5V ?
5V VCC VOLT ?
PATTERN SHORT ?
IN01,I701 EXCHANGE ?
CHECK D811 ~ D815
CHECK I802,804,805
OK
OK
CHECK HEAT VOLTAGE,
16.5V, 45V, 190V LINE
NG
CHECK H DRIVE PULSE
AT PIN3 OF PA406
NG
CHECK H.VCC AT
PIN 37 OF I501
X501,X502 OSC OK ?
OK
OK
CHECK Q401,Q402,T401,C418
R401,R402,R407,R409
I301,D301,D302
OK
CHECK DATA,CLOCK AT
PIN 7,8 OF I501.
CHECK PULSE AT PIN 6,13,38
OF I501.
OK
CHECK PULSE R,G,B,FB AT
PIN 18,19,20,21 OF I501
OK
CHECK CONNNECTOR PA904
P401,PA408
OK
10-2. NO OSD DISPLAY
NG NG
CHECK V SYNC
OF P405.
NG NG NG
CHECK I301 AND
ADJACENT CIRCUIT.
CHECK H,V SYNC SIGNAL
AT PIN 45,46 OF I701
CHECK H SYNC
(SC) OF PA405
CHECK D501
CHECK CONNECTOR
(PA406) AND PATTERN
OK
CHECK OSD OSC
PULSE.
OK
CHECK L,C or I701 CHECK 23,24,25,26
PULSE AND VOLT
NG
CHECK BRIGHT,CONTRAST
CONTROL = MINIMUM ?
54
10-3. NO PICTURE(RASTER OK)
CHECK VIDEO SIGNAL
AT PIN6 OF I501 (TDA8374)
NG
CHECK DATA,CLOCK AT
PIN7,8 OF I501 ( TDA8374 )
OK
CHECK SIGNAL AT PIN48,
49 OF I501 ( TDA8374 )
OK
CHECK TUNER VCC, DATA
CLOCK,MODULE RF(ANT01)
10-4. NO COLOUR
NG
CHECK I701 AND ADJACE-
NT PATTERN.
CHECK R-Y,B-Y SIGNAL
AT PIN 31,32 OF I501.
(TDA8374)
OK
CHECK VIDEO SIGNAL AT
PIN13 OF I501 ( TDA8374 ).
NG
CHECK QC504,
QC512
29, 30, 31, 32 OF I501
NG
CHECK I502,
I503 AND VCC
AT PIN 18,19,20,21
OK
CHECK R-Y, B-Y
IN/OUT AT PIN
OK
CHECK SIGNAL
OF I501
OK
CHECK R,G,B SIGNAL
AT PIN 19,20,2 1 OF I501
OK OKNG
CHECK / REPLACE I901, I902
I903 ( CRT BOARD )
CHECK / REPLACE
I501 ( TDA8374 )
55
CHECK / REPLACE
I502 ( TDA4665 )
NG
CHECK R-Y, B-Y SIGNAL
AT PIN 29,30 OF I501
NG
CHECK X501,X502
CC523,CC524,CC534
CC503,RC543
NG
CHECK / REPLACE
I503 ( TDA8395 )
( SECAM )
NG
CHECK SIGNAL AT
PIN38 OF I501.
10-5. NO SOUND
CHECK AUDIO SIGNAL
AT PIN 15 OF I501
(TDA8374)
NG
CHECK VOLUME CONTROL
VOLTAGE ?
CHECK SIGNAL AT PIN 1
OF I501
NG
CHECK QC505,Z501,Z502
OK
CHECK SIGNAL AT PIN 55
OF I501.
10-6. NO EXTERNAL AV
SCART JACK INPUT
CHECK SIGNAL AT
PIN 23,24,25 OF I501.
CHECK VOLTAGE AT PIN
OK
I701 20 PIN = H ?
IN01 56 PIN = H ?
CHECK QCY17,QC601 AND
ADJACENT CIRCUIT
OK
2,3 OF I601
NG
SPEAKER ?
SPEAKER CONNECTOR ?
RCA JACK INPUT
CHECK SIGNAL AT
PIN 11 OF I501.
CHECK SWITCHING
VOLTAGE ABOUT 2.2V
AT PIN 26 OF I501.
NG
CHECK QC511 AND
ADJACENT CIRCUIT.
CHECK / REPLACE
I501.
CHECK SCART JACK
AND PATTERN.
CHECK I701 AND
ADJACENT CIRCUIT.
OK
OK
NG
OK
CHECK AT PIN 19 OF
I701 = H ?
OK
CHECK / REPLACE
I501.
NGOK
CHECK SCART JACK
AND PATTERN.
56
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