# LG OLED mainboard or power supply

> LG OLED mainboard or PSU faulty? Diagnosis order without blind buying — AmparioWeb helps map, repair and tested parts.

## 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](/en/blog/lg-oled-bleibt-schwarz), [standby LED off](/en/blog/lg-oled-standby-led-aus), [red LED](/en/blog/lg-oled-rote-led-blinkt), [PSU swap](/en/blog/lg-oled-netzteil-platine-tauschen).

## Document

Model, board print (often **EAY…** / **EAX…**), blink, click, HDMI influence.

[Find number](/en/nummer-finden).

## Safety

**Mains is lethal.** Live diagnosis only for pros.

## AmparioWeb

Tested **PSUs** and **mainboards**, fixed-price repair.

[Repair](/en/reparatur) · [parts](/en/bauteile).

## FAQ

**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](/en/blog/lg-oled-netzteil-platine-tauschen).

**Help?**

[Find number](/en/nummer-finden) then [repair](/en/reparatur).