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M9500 left edge "ringing"

 
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Tim in Phoenix




Joined: 21 Oct 2006
Posts: 4378
Location: Phoenix


PostLink    Posted: Sat Sep 16, 2017 3:46 pm    Post subject: M9500 left edge "ringing" Reply with quote


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Guys

Looked at a 9500 yesterday that is local. Worst case of left edge ringing I have ever seen. Tried an Ultra HDM no effect. May I conclude that the scan yokes are the problem?
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cmjohnson




Joined: 03 Apr 2006
Posts: 5180
Location: Buried under G90s


PostLink    Posted: Sat Sep 16, 2017 3:52 pm    Post subject: Reply with quote

No. While an imbalance between the coils in a yoke can cause slight ringing, the emphasis there is on SLIGHT ringing.

Is the unit being run direct from a source or is there a processor/scaler in the system?

Sync timings affect ringing, A LOT. And the higher the scan rate, the worse any given ringing issue will be.
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Tim in Phoenix




Joined: 21 Oct 2006
Posts: 4378
Location: Phoenix


PostLink    Posted: Sat Sep 16, 2017 4:04 pm    Post subject: Reply with quote

Guys

The problem was severe with no signal coming in, just internal white field at 63khz and the same at 32khz
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mp20748




Joined: 12 Sep 2006
Posts: 5681
Location: Maryland

TV/Projector: 9500LC Ultra / Super 02 and 03 VIM


PostLink    Posted: Sat Sep 16, 2017 6:55 pm    Post subject: Reply with quote

Ringing on left edge CRT is directly related to and caused from the horizontal deflection yokes. Ringing period, is usually always associated with coils/inductors.

Timings can reveal it, but it's usually caused from inductance.
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Tim in Phoenix




Joined: 21 Oct 2006
Posts: 4378
Location: Phoenix


PostLink    Posted: Sat Sep 16, 2017 7:41 pm    Post subject: Reply with quote

So.....

Try other yokes?
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mp20748




Joined: 12 Sep 2006
Posts: 5681
Location: Maryland

TV/Projector: 9500LC Ultra / Super 02 and 03 VIM


PostLink    Posted: Sat Sep 16, 2017 7:46 pm    Post subject: Reply with quote

Scott (VDC) said at one point it could be from the longer cable wires connected to the yokes. I would first look at changing yokes, and since you have already changed out the HDM. I would swap out the DPB on the control module, since it could be timings induced
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Tim in Phoenix




Joined: 21 Oct 2006
Posts: 4378
Location: Phoenix


PostLink    Posted: Wed Sep 20, 2017 1:00 am    Post subject: Reply with quote

Guys

My customer has lowered his 9500 from the ceiling and we hit it tomorrow---I am taking half of my shop over there including tubes, yokes, boards; pretty much everything that is suspect.

Film at 11
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gjaky




Joined: 05 Jun 2010
Posts: 2789
Location: Budapest, Hungary


PostLink    Posted: Wed Sep 20, 2017 5:04 am    Post subject: Reply with quote

Look out for proper video grounding as well!
_________________
projectors in the past : NEC 6-9PG xtra, Electrohome Marquee 6-7500, NEC XG 1351 LC ( with super modified Electrohome VNB neckboard !!!)
current: VDC Marquee 9500LC
The MOD: VNB-DB, VIM-DB
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Tim in Phoenix




Joined: 21 Oct 2006
Posts: 4378
Location: Phoenix


PostLink    Posted: Wed Sep 20, 2017 10:49 pm    Post subject: Reply with quote

Kudos to Mike

I swapped the entire control board and that fixed it completely, so likely the DPB.
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Tim in Phoenix




Joined: 21 Oct 2006
Posts: 4378
Location: Phoenix


PostLink    Posted: Tue Oct 17, 2017 2:39 pm    Post subject: Reply with quote

Hmmm

More weirdness on this one. My "ringing-free" control board ran good a few hours and went bizarre. The IOP took several seconds to react to each button press, accompanied by picture flashing. Not good. Put in a control board that did exhibit ringing just to give my customer a picture to watch, and brought the problem board back home. I reseated U16, the IOP chip, only to find it couldn't read the IR.

A new U16 chip, v3.1, fixed all the issues. I can't remember ever seeing a failure on these; good thing I have a few spare chips on hand. I am back with my customer on Saturday to wrap up his retubing.

I am also modding a VIM with 1.5m resistors for the "faint vertical line" problem; will advise how that goes.
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mp20748




Joined: 12 Sep 2006
Posts: 5681
Location: Maryland

TV/Projector: 9500LC Ultra / Super 02 and 03 VIM


PostLink    Posted: Wed Oct 18, 2017 8:36 am    Post subject: Reply with quote

Tim in Phoenix wrote:

A new U16 chip, v3.1, fixed all the issues. I can't remember ever seeing a failure on these; good thing I have a few spare chips on hand. I am back with my customer on Saturday to wrap up his retubing.


This is also my first hearing or about that particular (U16) causing that problem.

I have had an abundance of CLM problems on the later VDC version CLM with the even later version chips that are not the original Electrohome. So hold onto your chips for those later version CLM's, and there's several post on the 9518 where some have been a problem to get the projector to work after changing out some of the other boards in the set.


I'm thinking U16 would be the character generator IC.
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barclay66




Joined: 27 Jun 2011
Posts: 1291
Location: Germany

TV/Projector: Marquee 9500 Ultra


PostLink    Posted: Wed Oct 18, 2017 9:00 am    Post subject: Reply with quote

mp20748 wrote:
I'm thinking U16 would be the character generator IC.

Hi,

U16 is the I/O Processor (68HC711E9). It handles the internal and external remote, the serial and switcher ports, the LEDs on the CLM and controls the power state of the LVPS. It's supplied from the standby section of the LVPS.
As it has its own RAM, ROM and EEPROM, it needs to be programmed before use.
I do have blank chips, the required programmer and different versions of the firmware. So if anyone is in urgent need of fresh chips, I could be of help.

The character generator is either located in U106 or U100 which are both part of the internal video generator. I can program U100 (Mach120-20) as well.

BTW: The DBP uses the same chip like U16. There it is being used as main processor with a different set of firmware...

Regards,
barclay66
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