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EEVblog 1564 - Agilent/Keysight U1273AX Multimeter Repair

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EEVblog:
A very interesting repair of an Agilent/Keysight U1273AX OLED display multimeter. It had two distinct unrelated faults.

Available for auction from 99cents: https://www.ebay.com.au/itm/225767769508
Ian Scott Johnston on The Amp Hour: https://theamphour.com/643-calibration-repair-with-ian-johnston/
Thin film ceramic hybrid resistor networks:

sonic:
The screen of my U1253B got very dim after 9 years of light use. After trying the :rant: german Keysight support to no avail I got a replacement from https://parcelup.com/shop/item.php?id=591402268582#4133487996875
At least their U1253B version doesn't have the mirrored-after-menu issue.

SiliconWizard:
Those small OLED displays look cute but they aren't very reliable. Also, try seeing anything in direct sunlight.

lty1993:
The last time I contacted Keysight US about the replacement of the OLED, they informed me that if the product is no longer under warranty, the only available option is to purchase a new meter.

Shonky:
Seems like the replacement board is not very good and is not initialising the OLED controller properly.  i.e. OLED controller resets, but STM32 on the driver board doesn't re-initialise it and you end up in the reversed mode? Pretty poor and you'd think it would have shown this multiple times whilst developing it.

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