LG - 42" PLASMA TV _ TROUBLESHOOTING - HINTS

CONNECTORS

• Check each section with following method if there is problem, replace or repair that part.  If not go to the next section.

• Confirm every Connector (PSU, Y-SUS, CTRL, Z-SUS).  => module may not be normal by mis-connection which can not send signal and power. Also Mis connection for a long time has a specific b/d failed.

CTRL B/D + Y - SUSTAIN [NO DISPLAY]

CTRL B/D + Z-SUSTAIN

CTRL B/D + X - B/D

SIGNAL INPUT  [LVDS]

• Confirm exhausting Tip and find Crack with naked eyes to check vacuum state.  If there is problem replace the module.  in case of vacuum breakdown, module makes a shaking noise because of inside gas ventilation.  (there may be a small crack which could not see with naked eyes. And this noise is different from Capacitor noise)

NORMAL

CRACKED

• Check 3.3V, 5V,15V.
• Confirm LED D17(flashing) ,13 lighting. If not CHECK OSC X1 output.
• Check CTRL input voltage (CONNECTOR P300).
• Check IC 11 3.3V IC 3 2.5V.

Input voltage.

Diodes

IC - 11 [(+3.3V):  IC - 3 (+2.5V)

Oscillator:  Check oscillating state.  Normal is 100MHz.  Probe touching point.

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