DAEWOO cp420 Diagram

10. TROUBLE SHOOTING CHARTS

10-1. NO RASTER

			CHECK MAIN B+ ( 123V LINE )
NG.							OK
I806 6Vout ?						CHECK HEAT VOLTAGE,
Q803 BASE = H ?						16.5V, 45V, 190V LINE

NG.

OK

SW08,P803 SOLDER ?

TOP210 PIN VOLT ? PA805 VCR H = H ?

D825~D828,F801,R803 ?

NG.

OK

XN01,XN02,X701 OSC ?

PA406 MON. ON = H ?

RN46,47,48'S PULSE ?

NG.

IN01,I701 RESET = H ?

NG.

I701 EXCHANGE

DECK SEPERATION

NG

5V VCC VOLT ?

OK

PATTERN SHORT ?

DECK EXCHANGE

IN01,I701 EXCHANGE ?

OK

CHECK T801 SECONDARY

NG

VOLTAGE 8.5V,14V,13.5V ?

OK

CHECK I801 #9 VOLT

CHECK D811 ~ D815

I801 #7, #1 VOLT

CHECK I802,804,805

CHECK R817,D801~D804

EXCHANGE I801

	NG
CHECK H DRIVE PULSE
AT PIN3 OF PA406
NG							OK
CHECK H.VCC AT				CHECK Q401,Q402,T401,C418
PIN 37 OF I501				R401,R402,R407,R409
X501,X502 OSC OK ?				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

CHECK H,V SYNC SIGNAL

AT PIN 45,46 OF I701

NG

NG

OK

CHECK V SYNC

CHECK H SYNC

CHECK OSD OSC

OF P405.

(SC) OF PA405

PULSE.

NG

NG

NG

OK

CHECK I301 AND

CHECK D501

CHECK L,C or I701

CHECK 23,24,25,26

ADJACENT CIRCUIT.

CHECK CONNECTOR

PULSE AND VOLT

(PA406) AND PATTERN

NG

CHECK BRIGHT,CONTRAST

CONTROL = MINIMUM ?

5 4

10-3. NO PICTURE(RASTER OK)

CHECK VIDEO SIGNAL

AT PIN6 OF I501 (TDA8374)

NG

OK

CHECK DATA,CLOCK AT

CHECK VIDEO SIGNAL AT

PIN7,8 OF I501 ( TDA8374 )

PIN13 OF I501 ( TDA8374 ).

OK

NG

NG

OK

CHECK SIGNAL AT PIN48,

CHECK I701 AND ADJACE-

CHECK QC504,

CHECK R-Y, B-Y

49 OF I501 ( TDA8374 )

NT PATTERN.

QC512

IN/OUT AT PIN

29, 30, 31, 32 OF I501

OK

NG

OK

CHECK TUNER VCC, DATA

CLOCK,MODULE RF(ANT01)

CHECK I502,

CHECK SIGNAL

I503 AND VCC

AT PIN 18,19,20,21

OF I501

10-4. NO COLOUR

CHECK R-Y,B-Y SIGNAL AT PIN 31,32 OF I501.

(TDA8374)

OK

NG

CHECK R,G,B SIGNAL

CHECK R-Y, B-Y SIGNAL

AT PIN 19,20,21 OF I501

AT PIN 29,30 OF I501

OK

NG

OK

NG

CHECK / REPLACE I901, I902

CHECK / REPLACE

CHECK / REPLACE

CHECK X501,X502

I903 ( CRT BOARD )

I501 ( TDA8374 )

I502 ( TDA4665 )

CC523,CC524,CC534

CC503,RC543

NG

CHECK / REPLACE

I503 ( TDA8395 )

( SECAM )

NG

CHECK SIGNAL AT

PIN38 OF I501.

5 5

10-5. NO SOUND

CHECK AUDIO SIGNAL

AT PIN 15 OF I501

(TDA8374)

NG

OK

CHECK VOLUME CONTROL

CHECK VOLTAGE AT PIN

VOLTAGE ?

2,3 OF I601

CHECK SIGNAL AT PIN 1

OF I501

OK

NG

NG

I701 20 PIN = H ?

SPEAKER ?

CHECK QC505,Z501,Z502

IN01 56 PIN = H ?

SPEAKER CONNECTOR ?

CHECK QCY17,QC601 AND

OK

ADJACENT CIRCUIT

CHECK SIGNAL AT PIN 55

OF I501.

10-6. NO EXTERNAL AV

SCART JACK INPUT CHECK SIGNAL AT PIN 23,24,25 OF I501.

RCA JACK INPUT CHECK SIGNAL AT PIN 11 OF I501.

OK

NG

OK

NG

CHECK SWITCHING

CHECK SCART JACK

CHECK AT PIN 19 OF

CHECK SCART JACK

VOLTAGE ABOUT 2.2V

AND PATTERN.

I701 = H ?

AND PATTERN.

AT PIN 26 OF I501.

NG

OK

OK

CHECK QC511 AND

CHECK I701 AND

CHECK / REPLACE

ADJACENT CIRCUIT.

ADJACENT CIRCUIT.

I501.

OK

CHECK / REPLACE

I501.

5 6