Scan Ic(Y Drv B/D: Ic1~8) Damage - Daewoo DPP-42A1LASB Service Manual

3-4. SCAN IC(Y DRV B/D: IC1~8) Damage

(1) In case of SCAN IC poor, one horizontal line may open at
screen.
Test Point: ICT measurance of GND~Y DRV B/D output
O
Wave format: As shown below figure.
O
<When SCAN IC is poor>
(2) Screen may not shown when SCAN IC is damaged by
SCAN IC poor, external electricity or spark.
Test Point: ICT measurance of GND~Y DRV B/D output
O
Wave format: Output wave format isn't output (You can
O
see the damage for Y DRV B/D Top or Bottom's SCAN
IC)
(3) Screen shaked horizontally when Y DRV B/D Top and
Bottom cable is poor
Test Point: ICT measurance of GND~Y DRV B/D output
O
Wave format: As shown below figure.
O
<When Y DRV B/D Top and Bottom cable is poor>
(4) In case of shorting the SCAN IC output by a dust, foreign
substance, it may overlap two horizontal lines on screen.
Test Point: ICT measurance of GND~Y DRV B/D output
O
Wave format: As shown below figure.
O
<When SCAN IC output is short>
<SCAN IC Normal Output Wave >
Measurance position: SCAN section enlarge the after
O
measuring output ICT of Y DRV B/D.
(Full White Pattern)
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