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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Sun Dec 04, 2011 2:24 am Post subject: |
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replace the diodes on the cva with the sbyv27-200v (16 in total i think) and add the grounding strip.
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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Sun Dec 04, 2011 2:25 am Post subject: |
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| draganm wrote: | | dvh99 wrote: | | if you print out the schematic with the changes it will make it a lot easier. |
I did print up your schEmAtic Dennis.
| dvh99 wrote: | | you should jump wire q4 pin 2 and 3 (closest 2 holes to the heatsink) not from a resistor to a hole where a pin of q4 was. |
what about R2 and R3, you show those as eliminated? Do we jump Across R2 then across legs and 2 and 3? Isn't that the same as what I posted above with 2 wires instead of 1?
| dvh99 wrote: | | the heatsink must be removed in order to get this modification done right. |
not a problem
| dvh99 wrote: | diode is for voltage clamping this must be across the resistors on the bottom of the pcb (r219 and r220) with the minus side of the diode in the direction of the heat-sink.
if you print out the schematic with the changes it will make it a lot easier. |
So we leave R219 &220 in place and simply bridge over them with a Diode?
the thing that's confusing is you show a trace cut on the board where you crossed out this line? Is this cut what your bridgeing with a Diode? |
no i didn`t cut a trace there.
it was to make clear that the connection is gone after removing the mdc part, i failed at that in retrospect.
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Sun Dec 04, 2011 2:28 am Post subject: |
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I don't have a spare HDM' here so someone else needs to try this first..............Nash? 
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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| Posted: Sun Dec 04, 2011 2:39 am Post subject: |
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| draganm wrote: | | I don't have a spare HDM' here so someone else needs to try this first..............Nash? |
Why do I always have to be the Guinea pig!!!!
Wish I had time. I might order the parts and try it on my spare HDM later this winter. My Longbows have the fat heat sinks so they don't need this mod.
I need more hours in a day!!!
And Dennis is correct for the CVA, add the Soft recovery diodes.
Actually add them anywhere a 1N4002 Diode is.
Athanasios
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Bodi79
Joined: 08 Oct 2011
Posts: 130
Location: Austria
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| Posted: Sun Dec 04, 2011 2:42 am Post subject: |
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@nashou
Thanx for fixing the links !
If you want , i have my own rootserver so i can setup you up for a free domain !
Just PM me.
Cheers
Ronald
P.S.: And good night .. it is 3:41am here 
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Nashou66
Joined: 12 Jan 2007
Posts: 16171
Location: West Seneca NY
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dturco
Joined: 06 Feb 2009
Posts: 3778
Location: Eastern Shore Maryland
TV/Projector: Runco DLP VX-3000i Marquee 9500 parts doner
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| Posted: Sun Dec 04, 2011 4:29 am Post subject: |
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| draganm wrote: | | I don't have a spare HDM' here so someone else needs to try this first..............Nash? |
I have a spare HDM I could loan to the cause.
But shipping would of course kill the whole idea. 
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Sun Dec 04, 2011 6:18 pm Post subject: |
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Yep, sure looks like it. Same pin-out, inverting like original, input drive is compatable, and power input can be up to +40V so it can be directly run from the projector +24V so output drive is near +24V to correctly drive the new mosfets.
Scott
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Sun Dec 04, 2011 7:09 pm Post subject: |
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The capacitors that parallel the mosfets set the retrace time. Because C4 and C5 are being removed from the circuit the total capacitance is increased which will increase the retrace time from about 1.6us to about 1.84us (in short retrace mode). Not a big change but it is a change.
If the caps have the values shown in this schematic (some HDM versions are different) then the capacitance of C6 and C7 will be different than C10 and C11. The two mosfets will have different flyback voltage across them. Ideally these capacitances would be the same.
If C6 was changed to a 2.2nF cap like C10 the values across each switch would be the same and the retrace time would be about 1.72us short retrace) which is pretty close to original.
To calculate the retrace time determine the resonant frequency of the deflection yoke and the parallel/series value of the flyback caps. The time of this is one complete cycle. The flyback pulse is one half the time of one cycle.
L = yoke inductance in henries or 67 x 10^-6
C = parallel / series value of the flyback caps (don't forget about C8 and C13 which are switched in during long retrace) in farads.
So:
1 / (2 x pi x square root of L x C) = resonant frequency
resonant frequency / 2 = retrace time (add about 0.3us to this to make up for mosfet capacitance, yoke resistance, the inductance of the small balancing coils, and turn off delay time).
Scott
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"Were we directed from Washington when to sow and when to reap, we would soon want bread."
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Nashou66
Joined: 12 Jan 2007
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dturco
Joined: 06 Feb 2009
Posts: 3778
Location: Eastern Shore Maryland
TV/Projector: Runco DLP VX-3000i Marquee 9500 parts doner
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| Posted: Sun Dec 04, 2011 7:49 pm Post subject: |
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Scott Would this be doable on a HDM that has had the variable rate inductors Removed?
I think my HDM is running hot @ 1080p 60hz and causing a problem with the Vertical board causing a V fail shutdown?
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tse
Joined: 03 May 2006
Posts: 1014
Location: Sweatbucket, Fl.
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| Posted: Sun Dec 04, 2011 8:50 pm Post subject: |
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| dturco wrote: | Scott Would this be doable on a HDM that has had the variable rate inductors Removed?
I think my HDM is running hot @ 1080p 60hz and causing a problem with the Vertical board causing a V fail shutdown? |
The little variable inductors being jumpered out would make very little difference, so it is ok.
I don't know that the HDM can cause a V Fail shutdown. The deflection shutdown circuits are on the vertical deflection board and it gets a status signal from the HDM. I would think that a horizontal problem would be reported as an H Fail problem.
Scott
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dturco
Joined: 06 Feb 2009
Posts: 3778
Location: Eastern Shore Maryland
TV/Projector: Runco DLP VX-3000i Marquee 9500 parts doner
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| Posted: Sun Dec 04, 2011 8:54 pm Post subject: |
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| tse wrote: | | dturco wrote: | Scott Would this be doable on a HDM that has had the variable rate inductors Removed?
I think my HDM is running hot @ 1080p 60hz and causing a problem with the Vertical board causing a V fail shutdown? |
The little variable inductors being jumpered out would make very little difference, so it is ok.
I don't know that the HDM can cause a V Fail shutdown. The deflection shutdown circuits are on the vertical deflection board and it gets a status signal from the HDM. I would think that a horizontal problem would be reported as an H Fail problem.
Scott |
Good to know. I will be getting a new Vertical board then.
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Sun Dec 04, 2011 10:25 pm Post subject: |
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Thanks Scott and Dennis for clarifying. I think I will replace R219 and 220 and install them from the front of the board, then nest an SMD diode between the leads on the bottom side. That whole area is rather small to get 2 through hole devices on the same holes. I'll post some pics if I wind up with a working HDM. 
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draganm
Joined: 08 Mar 2006
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Nashou66
Joined: 12 Jan 2007
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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Sun Dec 04, 2011 11:29 pm Post subject: |
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replacing c6 with a 2n2 to get the same voltages across the switching mosfets is a good idea, will do this.
of course my convergence would have to be redone...... again.
dave, installed the pt tubes yet?
i just installed an almost perfect green and that was the biggest upgrade until now.
dragan, i wouldn`t use zeners, just get the diodes from the mouser link (get 100 to replace all 1n4002 parts)
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dturco
Joined: 06 Feb 2009
Posts: 3778
Location: Eastern Shore Maryland
TV/Projector: Runco DLP VX-3000i Marquee 9500 parts doner
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| Posted: Sun Dec 04, 2011 11:38 pm Post subject: |
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Nope not yet. But as soon as I get this V-fail thing taken care of their going in. The PT-22's are in their new housings,painted with the VHT epoxy, and I have just ordered the Orison coolant to go into the chambers.
While all of that is going on I think I'm going to have Dragan MOD my boards. I chose MOD on purpose
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draganm
Joined: 08 Mar 2006
Posts: 8990
Location: Colorado
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| Posted: Sun Dec 04, 2011 11:46 pm Post subject: |
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| dvh99 wrote: | | dragan, i wouldn`t use zeners, just get the diodes from the mouser link (get 100 to replace all 1n4002 parts) |
ok,
you mean replace all 4002's on my machine right, not everybody and their mother's.  Do we still need to jump C4 and C5? You did that earlier in the thread but it's not on the drawing?
Dave, lets see if this works first before sending me anything. My Mod's are mod's too they're just not this Mod'y.
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dvh99
Joined: 25 Dec 2009
Posts: 2158
Location: nederland
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| Posted: Mon Dec 05, 2011 12:28 am Post subject: |
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c4 and c5 are parallel to q3 so either one of them jumpered is fine i guess.
i jumpered the c furthest away from the heatsink (can`t recall if it was c4 or c5) q3 was just taken out.
nice ads by google btw, 3 nice girls from ukraine, anna tatyana and nataliya approx 22yrs of age weighing approx 54kg and approx length 162cm and quite stunning .
am i gonna miss all those fantastic ads if i become a member  .
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