In short
LG OLED mainboard or power supply means: which board to suspect first — mainboard or PSU (Power Supply Unit / power board)?
Symptoms drive the order. Buying both blind is expensive. AmparioWeb maps via model/board number and fixed-price repair.
Symptom → suspicion
Rough heuristic:
- Dead / standby LED off → PSU first
- Blink code / click no picture → often PSU
- Picture OK, apps/HDMI broken → mainboard/software
- Lines while powered → panel path, not blind PSU swap
Related
stays black, standby LED off, red LED, PSU swap.
Document
Model, board print (often EAY… / EAX…), blink, click, HDMI influence.
Find number.
Safety
Mains is lethal. Live diagnosis only for pros.
AmparioWeb
Tested PSUs and mainboards, fixed-price repair.
Repair · parts.
Frequently asked questions
- Always PSU first?
- For dead/no standby: often. For HDMI/apps-only: mainboard/software.
- Both dead?
- Possible after surge — still order, not double-buy.
- Panel?
- Lines/burn-in/edge dead pixels → panel path.
- DIY?
- Exact number + safety — PSU swap.
- Help?
- Find number then repair.
Support our work.
We write these articles for free, for everyone. A small donation helps keep the format going.
Power boards for LG OLED — tested under load, 12-month warranty.
Go to shopRelated articles
LG OLED stays black
LG OLED stays black with no picture? Check standby, triage PSU vs panel vs mainboard — AmparioWeb helps with diagnosis, repair and parts.
LG OLED TV won't turn on
LG OLED won't power on? Aging 820 nF film capacitors in the PSU often cause it. Spot capacity loss — AmparioWeb repairs or supplies a tested replacement PSU.
LG OLED clicks twice and turns off
LG OLED clicks twice then shuts off, or clicks with no picture? Relay engages, protection aborts start — often PSU, short or panel load. AmparioWeb helps with diagnosis and repair.