[TechAssist] Re: Panasonic LCD model PT-50LC13
- From: peggs <peggs@xxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx, techassist@xxxxxxxxxxxxx
- Date: Tue, 21 Feb 2006 10:28:29 -0800
thanks Jim,
Bob Waterman sent me the files for the Kit,and a file with a
troubleshooting Hint.
BTW,I previously stated I was getting no 'soound' from the Ballast PCB,I
was wrong I had the interlock(lamp cover) open.
There IS some 'sound' coming from the Ballast PCB,sort of like a ticking
sound...... but the Lamp looks good....... GREAT !!!
I'll try your suggestions.
BTW,I get a Green flashing Power light for about 2 minutes at Power On,then
it turns to Red flashing Power Light.
This Hint file says I should also have a 'Lamp LED Flashing' IF the Ballast
is Bad........ what/where is the 'Lamp LED Flashing' suppose to be ???
Peggs
At 07:56 AM 2/21/06, Jim Myers wrote:
>Sometimes the lamp is bad but looks just like a good one.
>There are a few things to check on the ballast, you can unmount it,
>remove the shield cover and flip it around to get to the front of the
>board. Then check across P1302 and P1303 for AC line voltage.
>Check P1301 pin 4 (the tech line guy said 17v but I get -81v)
>Check P1301 pin 1 (the tech line guy said 19v but I get +92v)
>Maybe I heard wrong
>Then check P1305 pin 1, should be lo in standby and hi when power is on.
>Then check P1305 pin 2, it should go hi when the lamp should turn on.
>
>On the PT-60LC14 that I am working on the lamp does not light, I jumped
>P1305 pin 1 to pin 2 and the lamp then lights so I know the lamp is
>good, it should be since it is a new lamp. Anyway you can make these
>checks and maybe verify if the lamp is good and possible if the ballast
>is good. The one I have is a Store Stock set so I can play around with
>it and order parts to try, I have the ballast on order now since it
>looks like it should turn the lamp on but does not.
>
>The Old Master Technician
>********************************
>Since 1972 *
>Jim Myers *
>Telrad Electronics *
>Fort Wayne Indiana *
>********************************
>
>
>peggs wrote:
> > It must be obvious when the Lamps are bad then.
> > By that I mean,you must be able to visibly tell that the Lamp has gone
> > bad....... this one is not(visibly).
> > At over $250 a piece,I'd like to have a way to Verify that the Lamp is bad.
> > I would hate to order one only to find a Bad connection is why it doesn't
> > lite-up.
> >
> > Peggs
> >
> > At 12:46 PM 2/20/06, J Silverman wrote:
> >
> >>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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