[TechAssist] Re: Panasonic LCD model PT-50LC13
- From: peggs <peggs@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx, <techassist@xxxxxxxxxxxxx>
- Date: Tue, 21 Feb 2006 09:13:52 -0800
Can the Voltage be measured with an HV Probe ???
Peggs
At 05:48 PM 2/20/06, Damon wrote:
>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
> > >
> >
> > --------------------------------------------------------------------------
> > ---
> > > This Email List is accessible to the general public through search
> > engines. Remove: http://www.tech-assist.org/remove.htm
> > > Set Vacation
> > mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation
> > > Lost Password: http://www.tech-assist.org and select "Login Problems?".
> > > Email Archives: //www.freelists.org/archives/techassist/
> >
> > --------------------------------------------------------------------------
>---
> > This Email List is accessible to the general public through search
>engines. Remove: http://www.tech-assist.org/remove.htm
> > Set Vacation
>mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation
> > Lost Password: http://www.tech-assist.org and select "Login Problems?".
> > Email Archives: //www.freelists.org/archives/techassist/
> >
>
>
>-----------------------------------------------------------------------------
>This Email List is accessible to the general public through search
>engines. Remove: http://www.tech-assist.org/remove.htm
>Set Vacation mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation
>Lost Password: http://www.tech-assist.org and select "Login Problems?".
>Email Archives: //www.freelists.org/archives/techassist/
-----------------------------------------------------------------------------
This Email List is accessible to the general public through search engines.
Remove: http://www.tech-assist.org/remove.htm
Set Vacation mailto:ecartis@xxxxxxxxxxxxx?subject=set%20techassist%20vacation
Lost Password: http://www.tech-assist.org and select "Login Problems?".
Email Archives: //www.freelists.org/archives/techassist/
Other related posts:
