[TechAssist] Re: Panasonic LCD model PT-50LC13
- From: "Tel-Tek Electronics" <teltek3@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 20 Feb 2006 22:21:11 -0500
OK....Let's not let this thing blow into what most remember about the "Old
Second Anode Lead".
The Interlock on the Lamp is meant for Safety reasons.
Eventually, the customer will want to replace this.
I'm not sure what voltages are present...at this point...don't care.
I'm sure there is something there to "excite" the lamp to come on.
By the old school, I don't loose sleep....On cold days, I still rub my
fluorescents over my benches to make them come on.
But as we go along..we'll learn.
-Ed-
Tel-Tek Electronics
Ontario-Canada
teltek3@xxxxxxxxxxxx
_____________________________
----- Original Message -----
From: "Damon" <DamonEB@xxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Monday, February 20, 2006 8:48 PM
Subject: [TechAssist] Re: Panasonic LCD model PT-50LC13
> 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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