LG 55EG9600 Training page 25

Read Me First Before Beginning
When servicing an OLED TV and you need to Test the Power Supply, due to the symptoms the TV Won't Come On or
TV Intermittent Powers Off, before beginning the Power Supply Testing READ THE BELOW FIRST.
Check the Front Power Indicator:
Take note of the front Power LED. If it begins to "Blink" (about once a second) continually for 30 seconds and the TV makes no
attempt to turn on, it means that the Main board is "Latched" and no functions work.
If this happens, the Main board will not function again normally until it is unlatched even if the Main board is placed in another
identical OLED model.
To Unlatch the Main Board:
Press the "Power Only" button using the Service Remote. This will place the TV into P-Only mode. P-Only = TV comes on
in Full White Raster. A P-Only black box with text appears in the upper left hand side of the screen. P-Only mode will also
bypass the "Burn_Det" circuit, which will allow the TV to turn on normally.
If the TV Comes on Normally in P-Only Mode (See Service Bulletin: GLZ201600041)
Press Exit on any remote and the screen is not full white raster. Press the "In-Start" button and enter the Service Menu.
Scroll down to "Power_Off_History" and look at the events that shut off the TV. If you find three consecutive
"INV_ERROR" this indicates activation of the Burn_Det circuit which is what "Latched" the Main board. If this is the case,
look for the Service Bulletin for this model; "Improved Auto Power Off / No Power issue". This bulletin requires you to
update the Software via USB only.
If the TV Still Won't Come On:
In this case follow the Power Supply Testing, check the Main board. If both are OK, replace the Panel.
If the OLED TV Shuts Off Intermittently: (See Service Bulletin: GLZ201600041)
With the OLED turned on, press the "In-Start" button and enter the Service Menu. Scroll down to "Power_Off_History" and look
at the events that shut the TV off. If you find "PWR_OFF_by_20V_DET or PWR_OFF_by_INV_ERROR", look for the Service
Bulletin for this model; "Improved Auto Power Off / No Power issue". This bulletin requires you to update the Software via
USB only. (Software has passed this version, make sure the TV SW is up to date).
If the TV Still Continues to Intermittently Shut Off: (INV_ERROR Continues)
In this case follow the Power Supply Testing, check the Main board. If both are OK, replace the Panel.
November 2017
(Software has passed this version, make sure the TV SW is up to date).
Page 01
55EG9600 (2015 OLED) Power Supply
LG