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6674A replacement LCD does not display - a contrast adjustment issue?

Question asked by drkirkby on May 14, 2016
Latest reply on May 16, 2016 by drkirkby

I have an HP 6674A option J06 (70 V, 30 A) PSU - the S/N is 3501A-00797. This was shipped and somewhere between leaving the US and reaching the UK, the display cracked, although some bits of characters could be seen.

 

I contacted Keysight in the UK to ask what is the replacement part would cost. I was told I needed 5065-7075, which I ordered and fitted. Unfortunately the display does not show anything at all, whereas the damaged one does at least show some characters. Below are the two displays - the original (P/N 5181-2813) one fitted and the replacement Keysight sent (5065-7075).

 

Are these two displays compatible in the 6674A?

 

Someone suggested it is probably necessary to adjust the contrast, but a search of both the user and service manuals does not tell me where the pot is for that. Can anyone tell me where I will find the adjustment pot?

 

comparision-of-the-two-displays.jpg

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