[TechAssist] Re: Panasonic LCD model PT-50LC13
- From: Jim Myers <jr.myers@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 21 Feb 2006 10:56:06 -0500
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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