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LG Ultrafine 5k 27MD5KA-B Display completely unresponsive test mode fails repair

From Repair Wiki
LG Ultrafine 5k 27MD5KA-B Display completely unresponsive test mode fails repair
Device LG Ultrafine 5k 27MD5KA-B
Affects part(s) PSU
Needs equipment
Difficulty ◉◌◌◌ Easy
Type Part replacement


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Problem description

Display is 100% unresponsive, test mode doesn't work.

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Symptoms

  • Display is 100% unresponsive.
  • Test mode doesn't work (see Test mode.)

Solution

Suspected faulty power supply.

Disassemble monitor and unscrew power supply, making sure to be careful with components such as capacitors which can hold charge for a substantial amount of time after being unplugged, make sure to touch the board holding only the edges.

  • Check the two fuses for continuity, replace if needed.
  • Check capacitors for swollen tops.
  • Check for any charred or miscolored components.

The power supply board is possible to buy online if needed.

https://www.ebay.com/p/7031234791

https://www.ebay.com/itm/225028024101

https://www.aliexpress.com/item/1005004728716386.html