[TechAssist] Re: Envision Flat Panel Monitor
- From: peggs <peggs@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx, techassist@xxxxxxxxxxxxx,<techassist@xxxxxxxxxxxxx>
- Date: Thu, 06 May 2004 13:11:41 -0700
I called Envision to inquire about the Lamp PCB,
http://www.envisiondisplay.com/main.asp
only to find that this Flat Panel is under Warranty,3 years parts and Labor.
No Wonder there are 5 Warranty Stickers in here !!!
They don't sell parts for their Monitors still under warranty.
Peggs
At 10:57 AM 5/6/04, peggs wrote:
>I'm now thinking I have some sort of Logic problem.
>It's back to the Power light coming on automatically,most times Yellow but
>sometimes Green,and it won't turn off by the Power Switch.
>Also no Video,and the Screen doesn't light-up OR
>Flash at all(which it did yesterday).
>
>I don't have anywhere near 200-250 volts going IN to the Lamp PCB.
>I see the DC-DC section on the Lamp PCB,but my only plug going TO this
>PCB has 3.3v,and (2) 12v supplies.
>The B+ Supply to this Monitor is a 12v supply.It comes in to the
>Main/Power Supply PCB and feeds a
>AIC
>1084-33CM
>103F1
>which I think is a 3.3v regulator.
>
>The 12v also feeds a
>XM21AC
>LM2596s
>which I think is a 5v Regulator.
>
>If I'm right about these regulators,their voltages are fine.
>I've tried unpluggiong the Input to the Lamp PCB to see if the Logic(Power
>Switch)
>would Turn the unit On and Off properly,but I have the same symptom.
>I found a 'borderline' SM capacitor,replaced it,but I have the same symptoms.
>
>Peggs
>
>At 05:27 AM 5/6/04, Damon wrote:
> >I think you can use your scope probe to pick up the DC-DC pulse generated
> >from the ballast/driver board...just like they do with IHVT pulses on the
> >transformer....I've seen on most units a spark gap that fires during start
> >up but I'm working on Sony, Phillips, and Samsung units, not Envision...
> >
> >And since MOST boards look like they came out of a Sony....I suspect one or
> >two suppliers/builders of the board, same with the lamp, just different lamp
> >frames and lamp sizes/shapes. Sure wish they'd REALLY universal-ize the
> >Lamps, I'd carry one or two on the truck then....
> >
> >Anyways back to your problem.....you can ONLY test the input voltage to the
> >Ballast/driver board, and I would expect around 200 - 250 volt input.
> >Normally after the fans start, you will see or hear a spark gap fire on the
> >lamp driver board, fires at a quick rate for about 2-3 seconds,
> >pauses....fires another 2-3 seconds....If you don't see/hear this, then just
> >replace the Lamp driver board, but I see MORE LAMPS BAD than LAMP DRIVER
> >BOARDS.
> >
> >----- Original Message -----
> >From: <majorthom@xxxxxxxxxxxxx>
> >To: <techassist@xxxxxxxxxxxxx>
> >Sent: Wednesday, May 05, 2004 11:02 PM
> >Subject: [TechAssist] Re: Envision Flat Panel Monitor
> >
> >
> >| Careful of lamp voltages as they're in KV -they are generated by a DC/DC
> >convertor ckt w/overload shutdown[protection] I have this model in shop and
> >gave up on it temporarily,As far as customer support Envision is cool KDS
> >sucks.AS to the specifics of why ask and I'll tell you.How are we ddoing so
> >far...Pete
> >| peggs <peggs@xxxxxxxxxxxxx> wrote:The main PS board is part of the Main
> >PCB(i hope that made sense:-)
> >| There are a few Radial Caps,but they ESR fine.
> >| There are also some SM Caps I've yet to check.
> >| The other board in here is the Lamps Driver/PCB.
> >| Any ideas what voltages I should be looking for on the Lamp PCB ???
> >|
> >| Peggs
> >|
> >| At 05:46 PM 5/5/04, Jim Shupe wrote:
> >| >Peggs...
> >| >
> >| > I would warm the thing's power supply slowly and
> >| >observe for any changes in symptoms...if there are
> >| >then you know you should ESR all the caps.
> >| > Nowadays, I find that the most common component
> >| >failures are electrolytic capacitors leaking and
> >| >drying out.
> >| >...just my two cents.
> >| >
> >| > Jim Shupe, CET
> >| > Lloyd's TV
> >| > Yucca Valley, CA
> >| >
> >| >peggs
> >| wrote:My first flat panel
> >| >to work on.
> >| >model EN-7100s
> >| >FCC ID: ARSLM782T
> >| >This thing has 5 warranty stickers inside here.#6 is
> >| >on the Back.
> >| >I guess they were expecting in-warranty troubles.
> >| >Anyway,when it was dropped off,we hooked it up and it
> >| >was
> >| >stuck in stand-by(yellow power light) and couldn't
> >| >turn it off.
> >| >Now,with the back removed Power light comes on and off
> >| >properly,but still
> >| >it's stuck in the stand-by mode,with a slight Flash by
> >| >the Screen periodically.
> >| >
> >| >I don't know what the Voltages should be on the Lamp
> >| >or on the PCB that
> >| >drives it.
> >| >Would this Lamp cause it to stay in stand-by ???
> >| >
> >| >Peggs
> >| >Peggs' Electronics
> >| >1519 West 2nd Street
> >| >Owensboro,KY 42301
> >| >270-926-4968
> >| >fax 270-686-7399
> >| >peggs@xxxxxxxxxxxxx
> >| >
> >| >
> >|
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> >|
> >| Peter Neal
> >| Neal Electronics
> >| 1905 E. Wm.Cannon
> >| Austin,TX 78756
> >|
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