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Old 09-22-2021, 07:13 AM   #1
ducttape
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Join Date: Jan 2021
City & State: Ljubljana
My Country: Slovenia
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Default LG 55LA6908 bad solder on main board

Hi guys,

My parents have a 2013 LG 55LA6908 which is suffering from increasing in frequency intermittent issues, such as random shutdowns (POWER_OFF_BY_CPU_ABNORMAL), UI freezing, dying HDMI ports, etc... My guess is bad solder joints under the main BGA IC.

I was trying to find a new main board for it but I'm unsure of the compatibility between different parts, models/screen sizes and software versions. If someone could help me out with the compatible part numbers it would be very helpful!

Product code is 55LA6908-ZB.BEUYLJG with LC550EUG (PF)(F1) LCD panel.
Main board PCB is EAX64797003(1.2), sticker has bar code with "WJM33233C101048 / 897785815 / 55LA660S-LGD / EBT62297952"

I'm able to copy the EEPROM from the old to the new board, if that helps...

Thanks for the help!
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Old 09-22-2021, 03:18 PM   #2
neilc6
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Join Date: Nov 2015
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Default Re: LG 55LA6908 bad solder on main board

Your part number is EBT62297952. The blank PCB is part number EAX64797003 and it may be populated differently for different models. Sometimes a different screen size main board from the same series may be compatible but you need to compare all the connectors closely. Have you tried a factory reset? LA and LN series aren't known for BGA failures but for bad backlights.
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