Daewoo DVN-14F6N Service Manual page 86

TROUBLESHOOTING ACCORDING TO CAUSE AND SYMPTOM
1. POWER SUPPLY UNIT
2. VERTICAL, HORIZONTAL UNIT
3. SERVO/SYSCON UNIT
4. VIDEO UNIT
5. AUDIO UNIT
– Before Troubleshooting, Read followings.
• Picture is not appeared when occurs following items.
1) When power supply is not supplied
2) When horizontal output TR is dead
3) When operation of over current protecting circuit.
4) When +125V is not supplied to FBT.
• Suggestions when service power supply unit.
1) When change components of trouble part, disconnect
Power pulg and discharge voltage across both terminals of C806 completely. (use scores of KOHM resistance on
the outside)
2) When examine the priwary circuit using oscilloscope, insulate oscilloscope surely and connect to the primary
GND.
3) Check Fuse and cement resistance when change trouble part.
4) Check soldering conditions of heat sink and other parts after completing services.
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