Checking High Voltage Zener and required datasheet for T3D98

I am trying to repair a Panasonic plasma 42 inch TV TH-P42C10D. one of the suspicious components is a Zener T3D98 which is showing infinite resistance on both sides using a
diode check with a multimeter.
I cannot find any data on this. I presume this is a high voltage 100, 150 or 200 volts zener in the power supply after the bridge rectifier and parallel to the transformer input.
How can I get data on this and can it be checked with a DMM?
Thanks.

As always, many manufacturers use 'in house' numbers on their components, so the number may well be totally meaningless.

You also may not be able to check such a device on a multimeter, and it would be extremely unusual for a high voltage zener to go O/C - if they fail it would almost certainly be S/C.

As far as I'm aware repairs on Panasonic Plasma sets were 'board only', with no individual spares available, and often no circuits either?.

Nigel,
Many thanks for your quick response. A service manual is available on https://elektrotanya.com/panasonic_..._th-p42c10t_chassis_gph12da.pdf/download.html
You are right, Panasonic like most other manufacturers, now prefer board only repair. The service manual unfortunately says only that it is a Zener diode,
so that is why I am looking for a data sheet, or at least find out its rated voltage. Incidentally this is a 220 volt model.
With best wishes.
spdy

As I said, it's unlikely a datasheet is available, as it's probably an in-house number, so completely meaningless.

Thanks, I just found out it is a diode with a zener both connected at anodes so will show open in both directions with a dmm.

High voltage zeners are also often a number of lower voltage ones in series, so a DMM probably won't provide enough voltage to overcome the junction voltage.

Thanks for this information.