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[TV] Re: RCA HD61LPW163 DLP Dead No turn on
ahh no problem, ive been there a few times. hehehehee.
----
Mike
----- Original Message -----
From: "= Steve =" <houaudiovideo@xxxxxxxxxxxxx>
To: <tv@xxxxxxxxxxxxxxx>
Sent: Sunday, July 29, 2007 4:08 PM
Subject: [TV] Re: RCA HD61LPW163 DLP Dead No turn on
>
> OH.. my mistake.
> Non the less you can build a power supply to check the LCD rear
> illumination lamps with this power supply.
> Sorry for the confusion..
> No coffee this morning!
> ---Steve
> Steve Rumel
> Houston Audio Video Service
> 2727 Fondren, Suite 5Q
> Houston, Tx 77063
> 713-780-4440
>
> ===================================
>
>
>
>
> = Steve = wrote:
>> http://www.ace4parts.com/Departments/strongBrowse-By-Categorystrong/Lamp--Led/Cold-Cathode.aspx
>> These folks are a power supply that will fire those lamps.
>> In case the link doesn't make it, it's www.ace4parts.com Look under
>> lamps and the cold cathode.
>> Steve Rumel
>> Houston Audio Video Service
>> 2727 Fondren, Suite 5Q
>> Houston, Tx 77063
>> 713-780-4440
>>
>>
>>
>> steves@xxxxxxxxxxxxxxxxxxxxxxxxx wrote:
>>
>>> Thanks for the feedback Mike, I am still trying to learn how to test
>>> thesse lamps. They either need to be ignited or is there any simpler way
>>> besides a visual. Visually the lamp is intact although some min
>>> estimated 3000 hours on it. At turn on there is absolutely no sound,
>>> tick or pop. Just the occasional sound of the relay which only turns on
>>> and will not shut off the set from the power switch. I suspected the
>>> turn off will not be allowed until the proper start up sequence
>>> completes. Are you familiar with the startup cycle? Upon plugging in the
>>> unit, relay clicks as the front lights turn on and this is the only
>>> sound you hear.
>>>
>>> -----Original Message-----
>>>
>>>
>>>> From: Mike Bates <mbates17@xxxxxxxxxxxx>
>>>> Sent: Jul 29, 2007 11:08 AM
>>>> To: tv@xxxxxxxxxxxxxxx
>>>> Subject: [TV] Re: RCA HD61LPW163 DLP Dead No turn on
>>>>
>>>>
>>>> well since the ballast is seeing the Boost-up B+ from the boost
>>>> converter,
>>>> it should be ready to fire.
>>>>
>>>> make sure the lamp is really ok, im sure you probably already did.
>>>>
>>>> Also there is an opto isoloator on the ballast board. probabably 2 of
>>>> them
>>>> on the input connector to the motherboard. one is to signal the ballast
>>>> on,
>>>> another is to tell the MB the lamp is lit or not.
>>>>
>>>> you can jump the transistor side of the opto on the signal-on to see if
>>>> the
>>>> ballast is going to fire. it woudl tell you if its the ballast or the
>>>> motherboard. also listen for a distinct "popping" sound near the
>>>> ballast
>>>> during power on, which is the ignition voltage hitting the lamp trying
>>>> to
>>>> ignite it. if you hear nothing and jumping the opto does nothing, then
>>>> the
>>>> ballast is bad.
>>>>
>>>> usually what goes bad in the UHP ballast is the H-Bridge which is
>>>> running an
>>>> IRF640 mosfet bridge. something like that. one shorts.
>>>>
>>>>
>>>> ----
>>>> Mike
>>>>
>>>>
>>>>
>>>> ----- Original Message -----
>>>> From: "steves@xxxxxxxxxxxxxxxxxxxxxxxxx" <stevescalza@xxxxxxxxxxxxxx>
>>>> To: <tv@xxxxxxxxxxxxxxx>
>>>> Sent: Sunday, July 29, 2007 7:54 AM
>>>> Subject: [TV] RCA HD61LPW163 DLP Dead No turn on
>>>>
>>>>
>>>>
>>>>
>>>>> This DLP TV has a power lite that stays on yet no fire-up of the
>>>>> ballast.
>>>>> I expect that part of the reset sequence for this TV is to power up
>>>>> the
>>>>> lamp ballast before completing the reset. Once on it wont shut its
>>>>> indicator lamps off but the Ballast or lamp assemble gets the 365V DC
>>>>> from
>>>>> the relay circuitry once plugged in, then nothing happens. Is anyone
>>>>> familiar with the start up process of this model? Does the ballast
>>>>> become
>>>>> a high failure rate part (Module) I cant see any obvious physical
>>>>> damage
>>>>> and the ballast is getting power but there is no corresponding lamp
>>>>> activation. Any input/shared experience here would be great.
>>>>>
>>>>> Thanks
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