[TechAssist] Re: Panasonic LCD model PT-50LC13
- From: "Damon" <DamonEB@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 20 Feb 2006 20:48:36 -0500
Important! DO NOT try to measure the voltage across the lamp...It'll blow
any meter-any scope-anything!!
Defeat the door switch with the lamp in place and listen for a subtle tik
tik tik or squh-wee type sound which indicates the ballast is firing. If not
the main DC voltage to the ballast can be anywhere from 250 to 380 V, since
it comes from a voltage doubler expect about 320 Vdc.
Jerry is right about lamp life, just like any TV turning it on and keeping
it on is better than turning it on/off for every show being watched. Reduces
the amount of stress from start up.
Check for filters, and proper fan operation too. I think the filter on this
unit is accessable from the front -center near the top of the light engine
if memory serves me correctly.
Damon B
Telrad Electronics
Fort Wayne IN
----- Original Message -----
From: "J Silverman" <greentron@xxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, February 20, 2006 3:46 PM
Subject: [TechAssist] Re: Panasonic LCD model PT-50LC13
> Its an arc lamp so it is not supposed to "measure". An interlock prevents
> you from accessing the kilovolt arc strike and hundreds of high frequency
AC
> operating volts. The lamp life varies from one lamp type to another, but
> 4000 hours is probably a reasonable life to expect. The life is shortened
by
> frequent restarts. Panasonic had a ballast mod kit to reduce the strike
> voltage, which was causing a reduction in lamp life, for certain models
and
> serial numbers. Some brands have no ballast problems but some brands have
a
> lot. One servicer that services a lot of LCD and DLP projectors says that
> they always take a ballast along JIC.
> Jerry Silverman
> Greentron Inc
> 4 Newland Ave
> Greenville SC 29609
> Fax/Phone 864 232 3889
> mail to: greentron@xxxxxxx
> ----- Original Message -----
> From: "peggs" <peggs@xxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Monday, February 20, 2006 4:39 PM
> Subject: [TechAssist] Panasonic LCD model PT-50LC13
>
>
> > My first large screen LCD TV Repair,so excuse the obvious questions.
> > I've repaired a few Flat panel monitors,and one small 23" flat panel
> > Televison,but this one is new ground for me.
> >
> > Customer is not happy...... he's replaced the Lamp himself once(a few
days
> > out of warranty), that one lasted about a year and his TV is not working
> > again(same symptom).
> >
> > At Power On,Power Light goes from Red to Green momentarily,then to
Orange
> > with 2 quick blinks.....pause....2 quick blinks(and so on).
> > Lamp measures open(that is by normal 'projector' bulb standards),that's
my
> > first question,How should these Lamps measure ???
> > But, I also have no Voltage on the Lamp's Connector........ which begs
my
> > 2nd question,What Voltage should I measure for the Lamp ???
> >
> > Looks like a Lamp and Ballast(board) Repair(man,these things are
> > expensive),but I thought I better get some input first.
> > WinStips seems to agree,but in there I see a KIT (LSUC0022) for the
> Ballast
> > PCB Repair.
> > Anybody installed one of these Kits ???
> >
> > Peggs
> > Peggs' Electronics
> > 1519 West 2nd Street
> > Owensboro,KY 42301
> > 270-926-4968
> > fax 270-686-7399
> > peggs@xxxxxxxxxxxxx
> >
>
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