LG Service Mode

LED BLINKING CODES - LG50PG20 - PLASMA TV - CONNECTOR VOLTAGE DETAILS

VISUAL CLUES FOR FAULT BY LED BLINKS

This information pertains to “Shorted” voltage lines, not
Open voltage lines

• STBY 5V Short or Open: Power LED does not light in stand by.
  No Power button function.


• AC Detect Open (Shorted Reset Line): Power LED is lit all
  Blue, 5V STBY OK. Power Button has no effect.


• M5V Vcc Short: Apply AC Power, goes to flashing Red and
  Blue. Relay Clicks “On and Off”


• 12V Short: Power LED is lit Red in stand by. At Power On,
  Power LED flashes 2 times Blue then 1 Long Blue goes back to Red. Relay clicks
  off immediately.


• 16V Short: Apply AC Power , Power LED flashes Blue. Relay
  clicks rapidly on and off.


• Va or Vs Short: Power LED is lit Red in stand by. At Power
  On, goes to Blue. Relay closes. Power LED blinks blue twice and3rd blink stays blue.
  Relay opens, LED goes to red. Power Supply outputs 16V,12V and 5Vcc,drops to 0V
  after the relay opens. No Va or Vs. With Relay closed, 330V OK, then when relay
  opens, it drops to 155V.

CN101 and P801 Pin ID and Voltages

Voltage and Diode Test Measurements for the SMPS.  All voltages from a working unit.

Connector: CN101

Pin Number: 1 & 3.

Standby: 120VAC

Run: 120VAC

Resistance: 480K

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