Advertisement
8. Trouble Shooting
8. Trouble Shooting
* Facts you must know at trouble diagnosis or repairing
(1) The trouble diagnosis and repairing of set means Module or Main IC Exchange.
In other words, find out which PCB modules or Main ICs are not working and replace them
with normal PCB modules or ICs.
(2) This TROUBLE SHOOTING list only contains representative and simple PCB or Main IC
trouble diagnosis and Module or Main IC Exchange method. Therefore, if you find Sets
that are difficult to diagnose or to repair, contact Daewoo Electronics.
(3) Basic TROUBLE SHOOTING procedure :
Check Trouble Symptoms
PCB module or Main IC
Adjust white balance
(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) Each block operation was explained including Digital Oscilloscope signal, but this is
reference only and applying them for repair is not necessary.
(6) Before assemble/disassemble PCBs, check to see if AC Switch is OFF.
(7) After Back cover is closed, redo Heat-run for at least one hour by inputting Full white using
test pattern of service mode. Check the screen conditions and basic functions.
Symptoms of adaptor, 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, PC or Component etc.) does not operate
<Symptom.4> No SOUND
<Symptom.5> Remote Control or KEY does not operate
Detach Back Cover
Heat-run (for at least 30 minutes, input Test pattern full white)
Function Check
Trouble Diagnosis
Repair Complete.
Replace broken
Advertisement
