LG - PLASMA_DEFECTS_CHECKS _REPAIR _Contn:

Contn:
                                                             [2]

LINE DEFECT BY EACH PARTS

BUFFER IC FAIL

COF IC 1,2 =>192 line(96+96) open.   COF IC 3,4 => 64 line open (with fixed interval there is on,off_Repetition)

case 2 : Array resistor fail : COF IC1=>16 line , COF IC2 => 16 line open.

CASE 3:  COF IC FAIL.  96 line open.

HORIZONTAL BAR

It can make a horizontal bar that connector on Y b/d and Z b/d did not plugged well. Because sustain voltage can not be supplied to panel. So check connectors (FPC, Y drv_Y drv) first.

Most horizontal defects can be repaired. In case of adherence part of the Film and rear panel electrode defect or panel electrode open, short , replace the panel.

Disconnected.

SCREEN OFF : Disconnected.

SCAN IC CHECK

Check diode value of the right side part of output pin.

Normal diode value.  (in case of Panasonic IC=1.035). # It can be different from each IC Maker. (in case of TI IC= 0.6~0.7).

Defect diode value= 0.018

HORIZONTAL LINE

FPC electrode open.  In case of horizontal 1 or more line, it is due to FPC or panel inside.  ctrl b/d, Y b/d is just normal.

Horizontal [1] line.

Panel electrode insulation break.

MIS DISCHARGE

Most of mis-discharge appearance is problem of y drv ,y ,z b/d.check these boards when occurred.

• Confirm Y, Z SUS signal cable.
•  Check Y DRV IC FAIL
•  Check Y sus b/d voltages(-Vy.Vscw)
•  Check Y ,Z-SUS IPM fail
•  Replace CTRL b/d.

42"VGA [V6 MODULE]

42" XGA MODULE