Daewoo DLT-20W2, Service Manual

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7. Trouble Shooting
* Facts you must know at trouble diagnosis or repairing
(1) The trouble diagnosis and repairing of set means Module .
In other words, find out which PCB modules are not working and replace them with normal
PCB modules.
(2) This TROUBLE SHOOTING list only contains representative and simple PCB trouble
diagnosis and Module Exchange method. Therefore, if you find Sets which are difficult to
diagnose or to repair, contact Daewoo Electronics.
(3) Basic TROUBLE SHOOTING procedure :
Check Trouble Symptoms
→
Detach Back Cover
→
Trouble Diagnosis
→
Replace broken
PCB module
→
Adjust white balance
→
Function Check
→
Repair Complete.
(4) Required equipments for trouble diagnosis
- Digital Multi-meter (measure Dc voltage, measure Diode Voltage, Short-Open test)
- Screwdriver (or electric screwdriver), plastic adjusting tool
(5) Before assemble/disassemble PCBs, check to see if AC Switch is OFF.
(6) After Back cover is closed, redo Heat-run for at least one hour by inputting Full white
pattern.
Symptoms of power, inverter, panel Trouble
<Symptom.1> Not even weak discharge (luminescence) shows on screen.
<Symptom.2> Discharge (luminescence) on screen is unstable
<Symptom.3> Set is producing unusual noise
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, etc.) does not operate
<Symptom.4> No SOUND
<Symptom.5> Remote Control or KEY does not operate