All digits on Tubes are on

[wwattersonParticipant]

I’ve build a few of the NCM109 boards now with IN-14 and IN-12 Tube boards. This board has been working fine for a few weeks already but today for some reason all the digits on the tubes are turned on.
I’ve tried the tube board on another main board and it works fine so I know it must be something on the NCM 109.
Could someone point me in the right direction to figure out what I’ve done wrong.

Thanks

[Gra AfchKeymaster]

Hello Watterson.

The problem is apparently with HV chip on NCM109 board.
Check the voltages on TestPoints:

SCK – 4.9 V
SCK0 – 11.76 V
MOSI – 4.97 V
MISI0 – 11.74 V
LE0 – 11.71 V
TP1 – 5 V
TP2 – 177.9 V
TP3 – 11.77 V

Write back then.

[wwattersonParticipant]

Hi, Here’s the voltages which seem to be inline with your specs.

SCK – 4.97V
SCK0 – 11.79V
MOSI – 4.97V
MISI0 – 11.77V
LE0 – 11.74V
TP1 – 5.00V
TP2 – 179.7V
TP3 – 11.80V

Thanks for the help

[wwattersonParticipant]

Hi again,

Haven’t heard back from you yet, but I figure the voltages that I took point toward a bad HV chip.

[vincentautranParticipant]

Hi Same problem,
My board is a NCS314 v2.2
Here my voltage :
SCK – 4.96V
SCK0 – 11.3V
MOSI – 4.96V

LE0 – 11.30V
TP1 – 11.30V
TP2 – 11.29V
TP3 – 5.00V
TP4 – 180.00V
I put a HV5122PJ for HV Ship
Need help too
Thanks

[Author]

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