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King KN62A DME - display troubles

Thread starter Archer181
Start date Jul 15, 2019

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Archer181

Supporting Member

Jul 15, 2019

My king KN62A DME display failed on a 3 hour trip last month. It is showing the number 8 on the extreme left and you can see sweeping across the rest of the display.

I am aware of the issue with dodgy contacts on the gas discharge display - cleaning did not work so it went into the repair shop. Also the light dependent resistor which dims the display was replaced 3 years ago and is in good condition

The repair shop

1. Tried a known working display from another DME to rule out issues with the display - no changes
2. Replaced the two driver chips with the proper OEM ones (not the cheap Chinese copies that are on the market).
3. Changed a diode and transistor which also usually give issues.

This normally repairs 95% of DME's but mine has not responded. Does anybody have any suggestions as we are about to give up on the unit. I am based in the United Kingdom BTW.