[TechAssist] Re: Panasonic LCD model PT-50LC13
- From: Jim Myers <jr.myers@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 21 Feb 2006 12:07:10 -0500
Switching to the B list on purpose.
I sent the TS guide to your email, did it get there ok? It has the error
codes as well as the ballast troubleshooting information.
The Old Master Technician
********************************
Since 1972 *
Jim Myers *
Telrad Electronics *
Fort Wayne Indiana *
********************************
peggs wrote:
> 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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