CurtPalme.com Home Theater Forum

bluemoonhu · Joined: 16 Feb 2021 Posts: 229

After my Barco 708mm is turned on, the crt tube could not light up, the LED at the front of the machine shows a red light, which means that it is ‘hold down EHT’ fault, I replaced a HV quadrupler, but the fault is still there. I don't know where the error occurred? Thanks!

**Curt Palme** · Posted: Thu Apr 21, 2022 1:57 pm Post subject:

It can also be the HV splitter or a fault on the power supply board, or a short in one of the tubes. Disconnect the HV lead going to all tubes, and turn on the projector and see if the red EHT light still comes on. If so, I'd change the HV splitter next. I've got them for sale here:

https://www.ebay.com/itm/354011179765?hash=item526cb5eaf5:g:quoAAOSwLaBiWckq

bluemoonhu · Joined: 16 Feb 2021 Posts: 229

OK,I will test.

Thanks!

bluemoonhu · Joined: 16 Feb 2021 Posts: 229

after disconnect the HV lead going to all tubes, “HOLD DOWN EHT” fault LED light still comes on.

bluemoonhu · Joined: 16 Feb 2021 Posts: 229

I replaced the test with a spare HV splitter， The HV splitter is faulty. I may need a HV splitter and a RGB driver board of BG 808s

Thanks Curt

**Curt Palme** · Posted: Thu Apr 21, 2022 4:10 pm Post subject:

I don't have the RGB driver boards any more.. I don't think.

bluemoonhu · Joined: 16 Feb 2021 Posts: 229

Unfortunately, when I turned on the machine for the second time,The machine gave a bang， the 708mm shows ‘hold down EHT’ fault again，the HV splitter seems to be damaged，I don't know what happened？

bluemoonhu · Joined: 16 Feb 2021 Posts: 229

I may have made a mistake. I connected one end of the HV splitter to the casing. this is the most original installation method of 708mm, When I removed this line from the casing, and disconnect the HV lead going to all tubes, ‘hold down EHT’ fault LED light will changed from red to yellow，but the left end of the upper part of the machine made a sound，is this what Curt said about ' a short in one of the tubes'?
I don't know how to find the fault？

Thanks!

bluemoonhu · Joined: 16 Feb 2021 Posts: 229

This is the line

bluemoonhu · Joined: 16 Feb 2021 Posts: 229

This is the element that makes a sound

bluemoonhu · Joined: 16 Feb 2021 Posts: 229

If the lead lines of all the tubes is connected to the HV quadrupler, the LED light will show ‘hold down EHT’ fault.

bluemoonhu · Joined: 16 Feb 2021 Posts: 229

This is "Disconnect the HV lead going to all tubes", LED light is normal，but the element that makes a sound ,and the neck of the green tube flashes

bluemoonhu · Joined: 16 Feb 2021 Posts: 229

This is "Disconnect the HV lead going to all tubes", LED light is normal，but the element that makes a sound ,and the neck of the green tube flashes

bluemoonhu · Joined: 16 Feb 2021 Posts: 229

This is "Disconnect the HV lead going to all tubes", LED light is normal，but the element that makes a sound ,and the neck of the green tube flashes

bluemoonhu · Joined: 16 Feb 2021 Posts: 229

I only disconnect the G2 line and HV Line of the green tube, after starting up，the 708mm running is OK

bluemoonhu · Joined: 16 Feb 2021 Posts: 229

I only disconnect the G2 line and HV Line of the green tube, after starting up，the 708mm running is OK

bluemoonhu · Joined: 16 Feb 2021 Posts: 229

I only disconnect the G2 line and HV Line of the green tube, after starting up，the 708mm running is OK

bluemoonhu · Joined: 16 Feb 2021 Posts: 229

Very regret，fault found, I broke the green tube while moving the machine.....Does Curt have the green tube? Thanks!

**kal** · Posted: Fri Apr 22, 2022 12:52 pm Post subject:

Hulio · Joined: 15 Apr 2006 Posts: 469 Location: Belgium

Are the tubes P16LNG22 ? If yes, I know a cheap set in good shape.
Are you located in Hungary ?