[TechAssist] Re: Quasar TV - QC298X50H - YAEDC218 - Vertical Collapse
- From: Jim Myers <jr.myers@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Mon, 29 Nov 2004 16:52:28 -0500
I haven't worked in manufacturing for quite some time now so I don't
know all the answers but a batch sample may be 10%, 2% or some other %
and then a small % of of the sample can fail and still be an acceptable
batch. A larger % of failures and it's a bad batch. Return to the parts
supplier and out the back door at reduced price to brokers then right
back into the supply chain as generics. I saw an earlier post on this
Quasar where the problem was a bad NEW capacitor instead of the LA7838,
so what ya gonna do, buy all yer caps from Matsushita? Not likely, but
you probably would not see many bad ones if you did.
*******************************************************************************************************************
Since 1972
Jim Myers
Telrad Electronics
Fort Wayne, Indiana
Kevin wrote:
> If one in a batch is bad, does that mean that the whole batch is bad? I
> am guessing that they make a certain number all at the same time.
>
> Kevin Wilks
> Kevin's TV & Video Repair
> Penticton BC Canada
> kevintv@xxxxxxx
>
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Jim Myers
> Sent: Monday, November 29, 2004 6:47 AM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: Quasar TV - QC298X50H - YAEDC218 - Vertical
> Collapse
>
> Large enough to test a sample instead of the entire batch and small
> enough to not to cause the factory to sink.
> ************************************************************************
> *******************************************
> Since 1972
> Jim Myers
> Telrad Electronics
> Fort Wayne, Indiana
>
> Kevin wrote:
>
>>How large were the batches?
>>
>>Kevin Wilks
>>Kevin's TV & Video Repair
>>Penticton BC Canada
>>kevintv@xxxxxxx
>>
>>
>>-----Original Message-----
>>From: techassist-bounce@xxxxxxxxxxxxx
>>[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Jim Myers
>>Sent: Saturday, November 27, 2004 7:26 AM
>>To: techassist@xxxxxxxxxxxxx
>>Subject: [TechAssist] Re: Quasar TV - QC298X50H - YAEDC218 - Vertical
>>Collapse
>>
>>I'm no xpert fer sure but in my opinion any semiconductor purchased
>
> from
>
>>a manufacturer should be an ok part since all the manufacturers have
>>safeguards in place to insure that the parts they purchase meet the
>>required specs. Way back when Magnavox was Magnavox I worked there and
>
> I
>
>>know they had an entire department set up to inspect and test incoming
>
>
>>parts by testing a sample of every batch, if the sample failed the
>>entire batch was rejected and returned to the supplier. Guess where
>
> the
>
>>cheap generics come from!
>>
>
> ************************************************************************
>
>>*******************************************
>>Since 1972
>>Jim Myers
>>Telrad Electronics
>>Fort Wayne, Indiana
>>
>>
>>Kevin wrote:
>>
>>
>>>I have never had a problem with generic vertical IC's. If I do have a
>>>problem, do I have to buy them from each manufacturer, or can I get
>>
>>them
>>
>>>from one manufacturer that would be good for all TV's?
>>
>>>Kevin Wilks
>>>Kevin's TV & Video Repair
>>>Penticton BC Canada
>>>kevintv@xxxxxxx
>>>
>>>
>>>-----Original Message-----
>>>From: techassist-bounce@xxxxxxxxxxxxx
>>>[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Jim Myers
>>>Sent: Friday, November 26, 2004 1:27 PM
>>>To: techassist@xxxxxxxxxxxxx
>>>Subject: [TechAssist] Re: Quasar TV - QC298X50H - YAEDC218 - Vertical
>>>Collapse
>>>
>>>From the manufacturers since we had problems with generics.
>>>
>>
>>
> ************************************************************************
>
>>>*******************************************
>>>Since 1972
>>>Jim Myers
>>>Telrad Electronics
>>>Fort Wayne, Indiana
>>>
>>>
>>>Kevin wrote:
>>>
>>>
>>>
>>>>Jim, where do you buy your vertical deflection IC's?
>>>>
>>>>Kevin Wilks
>>>>Kevin's TV & Video Repair
>>>>Penticton BC Canada
>>>>kevintv@xxxxxxx
>>>>
>>>>
>>>>-----Original Message-----
>>>>From: techassist-bounce@xxxxxxxxxxxxx
>>>>[mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Jim Myers
>>>>Sent: Friday, November 26, 2004 10:03 AM
>>>>To: techassist@xxxxxxxxxxxxx
>>>>Subject: [TechAssist] Re: Quasar TV - QC298X50H - YAEDC218 - Vertical
>>>>Collapse
>>>>
>>>>Generic LA7838? Shame, shame, shame!
>>>>
>>>
>>>
> ************************************************************************
>
>>>>*******************************************
>>>>Since 1972
>>>>Jim Myers
>>>>Telrad Electronics
>>>>Fort Wayne, Indiana
>>>>
>>>>
>>>>David wrote:
>>>>
>>>>
>>>>
>>>>
>>>>>Hello All,
>>>>>
>>>>>Replace LA7838 deflection IC along with caps C455 (100uf/25v) and
>>
>>C453
>>
>>
>>>>>(2.2uf/100v), TV was OK when I left. Customer called backed today,
>>>>>picture started developing lines on top of screen, slight
>
> compression
>
>>>>of
>>>>
>>>>
>>>>
>>>>
>>>>>picture, think he mentioned black on top. What caps did I miss?
>>>>>
>>>>>Thanks in advance,
>>>>>
>>>>>David Lessard
>>>>>Alexandria Electronics
>>>>>mr_fixit@xxxxxxxxxxxx
>>>>>
>>>>>
>>>>>
>>>>
>>>>
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