HP 8590L No display

[moonbouncer]

Hi

I have a faulty HP8590L

It has Omni vision CRT LPOE3Y, I also have a TR60S1A available from a HP8591

On what i found both CRT's have different Sync frequencys ?

I noticed that on the 5 pin connector  J8 comming from the mainboard the +12V is missing, also the GND is not really chassis Gnd

So maybe something is wrong on the mainboard

Can anyone point me to a PDF servicemanual somewhere ?

Thanks

[pbarton]

http://oz1db.dk/hp/omnivision_man_lp06xx_rev0_0611.pdf
http://ftb.ko4bb.com/manuals/86.153.160.39/HP_8595X_Video_section_TR-60S1A_from_Panasonic_Operator_Manual-HP859X_module_video_panasonic_SM.pdf

https://community.keysight.com/thread/24266
https://community.keysight.com/thread/5339   "Panasonic and Omni Vision displays use different CRT's - same size - different pinouts.  They don't interchange."
https://community.keysight.com/thread/5121
https://community.keysight.com/thread/1808

The HP 8590 Series Service Guide says "If the display is blank, verify the MONITOR OUTPUT BNC on the rear panel by connecting an external monitor" or just scope it, to verify the presence of a video signal.
Simple way to verify that +12V is present on the monitor:- In low light conditions you should be able to see a 'glow' from the heater, at the back, of the CRT neck. (the monitor outer cover needs to be removed).
I'm aware that you have an OmniVision LPOE3Y monitor, however a common fault on the OmniVision LP0615E3Y monitor, is C14 4.7uF 50v.
If the FOCUS control is not having much effect, you need to measure R27 which should be 2M, but often drifts to 20M ohm.
OmniVision LP0615E3Y = 6" CRT and 15KHz sync.
OmniVision LP0619E3Y = 6" CRT and 19KHz sync.
I seem to remember that the monitor has three bunches of cables coming out of the back orifice. One goes to J8 on the main board. One goes to the front panel intensity/brightness control. A third single lead (possibly purple) goes into a 'difficult to see' connection, directly into the side of the 8590 power supply. I assume that there are all there? I'm thinking that the monitor does not bother to source +12V from the J8 connector, but receives +12V directly from the power supply side connector.
Power supply drawings are not available.
HP 8590 Component Level Information Package (CLIP) available from ftp://ftp.agilent.com/manuals/5963-2591%208590A%20Series%20Component%20Level%20Info%20Package%20July97.pdf
The two J8 drawing shown below, were both taken from .pdf page 388 of 418.
I don't think that you should be expecting +12V to be coming out of J8. The monitor gets +12V from a different place.
Good Luck.

[carl_lab]

Moonbouncer,
could you solve the problem?

[xwarp]

Tag for future use.