Daewoo DP-42GM Service Manual page 75

<Symptom.4> POWER SHUT DOWN occur ( refer to Service Manual 10-3 )
(5)Symptoms of DIGITAL PCB Trouble
(Note) DIGITAL PCB produces CONTROL SIGNALs for normal operation of Driving
BLOCK(X-SUS,Y-SUS,SCAN,DATA). Trouble of this PCB could generate further
damage to Driving BLOCK circuit. In other words, if Driving BLOCK CONTROL
SIGNALs are abnormal, all kinds of trouble symptoms of PCBs within Driving BLOCK
could occur.
<Symptom.1> Not even weak discharge (luminescence) shows on screen.
<Symptom.2> Discharge (luminescence) on screen is unstable (refer to Trouble
Symptom Picture<8> )
<Symptom.3> Screen DATA is abnormal
<Symptom.4> POWER SHUT DOWN occur ( refer to Service Manual 10-3 )
(6)Symptoms of VIDEO or JACK PCB Trouble
<Symptom.1> Only weak discharge (luminescence) shows on screen, but No Data is on screen
<Symptom.2> Screen DATA is abnormal
<Symptom.3> Particular input signal (Video, PC or Component etc.) does not operate
<Symptom.4> No SOUND
<Symptom.5> The Set does not operate normally. But, after turn off AC Power, if turn on again,
it operates normally again.
<Symptom.6> Remote Control or KEY does not operate
<Symptom.7> POWER SHUT DOWN occur ( refer to Service Manual 10-3 )
(7)Symptoms of CONN-LEFT & CONN-RIGHT PCB
(Note) CONN-LEFT & CONN-RIGHT PCB are to distribute Driving power (5V, Vadd)
provided by POWER PCB and CONTROL SIGNAL/DATA provided by DIGITAL PCB
to each PCB(X-SUS, Y-SUS, SCAN, DATA). This PCB contains simple components
such as BUFFER IC, resistors, capacitor etc. Therefore the trouble is most likely caused
by bad CONNECTOR CONNECTION due to dust or extraneous material.
<Symptom.1> Vertical line (BLACK or abnormal data, group or single) occur
( refer to Trouble Symptom Picture <1> ~ <4> )
<Symptom.2> For particular vertical BLOCK, Discharge (luminescence) is unstable or not
operating. ( refer to Trouble Symptom Picture <2>, <4> )
<Symptom.3> All possible symptoms when X-SUS, Y-SUS, or SCAN PCB has a trouble.
(8)Representative Symptoms caused by bad CONNECTION between PCBs.
(Note) Dust or extraneous materials most likely to cause bad CONNECTION. Most of this case,
it can be solved if using soft brush, AIR FRESHER, or breath to clean dust or extraneous
materials or reassemblling the Connector.
VIDEO DIGITAL ( P603 PA603 )
-75-