CurtPalme.com Home Theater Forum

[Decibel]

With a lot of spare parts I have assembled another whole projector but it does not work

The machine power up but shut down (reboot or stand by) after some seconds.

Note:

- chassis was pulled from 808s/E
- motherboard was pulled from 808s/E (new version but correct with change jumper)
- Vert. defl. + sync board was pulled from 808s
- SMPS was pulled from 808s
- all diagnostic leds of the SMPS G2 board light up, red led also (scan H or V failed)
- no other red led
- red led of EHT not light so I think that EHT/Quad/Splitter working
- there's one old red tube only, filaments light up, but nothing image appear.


I tried to remove convergence tray without success.


.... google translator

[Decibel]

[Ile]

Adjust horizontal width to smaller (CCW) from smps sub board. Sometimes smps from another projector have this turned too high and projector go to scan hold down.

[Curt Palme]

A dim LED on the H board is normal, bright = bad.

[Curt Palme]

A dim LED on the H board is normal, bright = bad.

[Decibel]

I turned to minimum the widht pot of the smps sub board.

All diagnostic leds of the G2 board are bright (the red led also).
Horizontal led shut down. The projector reboot or go in stand by.

If I turn to maximum the width pot, some diagnostic leds shuts (red led bright) and horizontal led bright.

ggggggggrrrrrrrrrrrrrrrrrrrrrrr

[zGman]

""- there's one old red tube only, filaments light up, but nothing image appear. ""

If you have only one tube installed and the deflection coils for the the other two
tubes aren't at least hooked up -- the machine will not start > goes immediately to
"deflection fail" > "EHT hold down"

G

Aren't you the fellow with the P16 tubes and HD18 lenses on the BG808S conversion?
How did you resolve your focus issues??

[Decibel]

[Curt Palme]

Funny, I was wondering that about the one tube, but figured it was the only old tube, that the other two were installed and were new. It's all in the wording.

[Curt Palme]

Funny, I was wondering that about the one tube, but figured it was the only old tube, that the other two were installed and were new. It's all in the wording.

[Decibel]

[zGman]

OK - you need to at least connect the other two deflection coils for testing.

Not sure I would want to run the rgb amps and conv/astig/focus open-ended for
very long, but it should boot and raise HV with all the deflection coils plugged in.

I have run one tube only when testing a batch of tubes a while back on a BG808S,
didn't have any problems - just lay the other two deflection coils in the chassis,
spaced carefully away from any potential shorts.

G

[Decibel]

[Decibel]

I think that I am a lucky guy: the projector is not still exploded!

muhauhauhuahahuhauha




Meantime I have changed the glicole to the green tube

[Decibel]

Ok ... I tried ...

three SMPS boards (one from 808, one from 808s and one from 808s/E).
three EHT boards (old version)
two splitter blocks (old version)
two G2 boards
two horizontal boards
two vertical+sync boards (one from 808s and one 808s/E)
two AC input boards

I reprogrammed firmware that was corrupted (failed compare original firmware file).

.... but projector not still work

The projector power up but only blue tube bright with intense light, without crosshatch.


I think that the issue is frame/motherboard

[Decibel]

YEAHHHHHHHHHHHHHHHH





But there is a little problem: they work with 120 mhz neckboards only



whyyyyyyyyyyyyyyyyyyyyyyy?????

[Decibel]

.... then all boards are working and modified motherboard works fine!

[VideoGrabber]

Dom,

There's more than one configuration/pinout of 120 MHz neckboards (i.e., they're not all the same), and only one of them is compatible with standard 75 MHz neckboards.

You've mixmastered things so much that it's hard to say for sure, but I believe the 808s/E is a newer unit with that comes stock with the "alternate" 120 MHz neckboards, and is not compatible with the 75 MHz neckboards (without some pinout and rewiring mods). Ile can probably give you exact part #s on all this stuff.

Is there some reason why you don't want to leave the working 120 MHz neckboards in there? They'll give you better performance.

> I think that I am a lucky guy: the projector is not still exploded! <

I would agree with that statement. While many parts are fully compatible between the various 808 models, not all are, and some substitutions can be fatal to your PJs health. Swapping boards blindly isn't highly recommended. Heck, it's not even lowly recommended.

I don't have the expertise with all the 808 variants that Ile, Curt, and a couple other Barco experts here have, but asking first about compatibility may save you a lot of grief in the long run. Going back in time to correct your mistakes is still limited to SciFi movies.

[Decibel]

Thank you Tim for your suggestions!

Before swap boards I asked here the compatibility.
If you search in my posts you can found many questions.

My 120 MHz necks come from 808s (Sony tubes) but I make mods for different pinout.
So they are fully compatibily with Panasonic 180dvb22 (or P16) tubes.

EHT chain (motherboard/splitter/quad/EHT) working correctly and is the same of the BG808.

75 MHz necks also!

All parts are "default" in the 808 except SMPS and Vert. Defl+sync.

So the issue are in one of these elements ... (???)

I don't want use 120 Mhz necks because they are a element of "upgrade kit" that I will sell

[Tom.W]

Use the neck boards that work than and screw the kit you are trying to sell...

Is it just my vision or are there two Red tubes ?

[Decibel]

[Tom.W]

Keep the better neck boards. Parts are getting cheap. Your Blue tube needs a bit of adjustment...........

On the late shift tonight