[TechAssist] Re: Semiconductor purchasing question
- From: Gary McCartney <gary@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 07 Oct 2005 09:34:14 -0400
Ed, I don't off-hand recall mentioning anything about 10 IC's for a
buck, or a buck each even. Maybe I just don't remember.
I haven't had any problems with their parts up until this one I posted.
Gary
Gary McCartney
McCartney Electronics
Guelph Ontario Canada
Est. 1984
email: gary (at) number63.ca
Tel-Tek Electronics wrote:
> Gary;
>
> Is that the place you told me about....10 IC's for a Buck?;-)
>
> -Ed-
> E.G.
> Tel-Tek Electronics
> Ontario-Canada
>
> teltek3@xxxxxxxxxxxx
> ----- Original Message -----
> From: "Gary McCartney" <gary@xxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Thursday, October 06, 2005 10:01 AM
> Subject: [TechAssist] Re: Semiconductor purchasing question
>
>
>
>>I recently had a similar problem. I had a Hitachi 27" that I replaced
>>the vertical IC LA7838 and when I plugged it in, got a buzzing sound,
>>like the SMPS wasn't working. So I replaced some caps, only to
>>eventually find that pin 11 in the LA7838 was shorted to pin 12, the B+
>>pin, causing the SMPS to growl. Put in a new 7838 and away it went, no
>>problem. I got those chips at AA Electronics in Mississauga ON, run by
>>Chinese people.
>>
>>
>>
>>
>>Gary McCartney
>>
>>McCartney Electronics
>>Guelph Ontario Canada
>>Est. 1984
>>email: gary (at) number63.ca
>>
>>
>>
>>
>>
>>
>>
>>Premium Technologies wrote:
>>
>>>Group,
>>>I had a Panasonic 27" in for repair today, with a not uncommon 3" high
>>>pic across the screen. Found three caps behind the vertical heat shield
>>>and the vertical IC LA7838 at fault. Replaced these and still had the
>>>problem. Traced and tested for about a half hour more and replaced the
>>>IC again, still same problem. At this point I'm fuming, going over the
>>>print, retesting up the circuit, ESR testing caps that I had done at
>>>least twice and looking for any clue as to why the IC looked as though it
>>>had failed.
>>>Finally I tried a third IC and to my surprise the pic was restored. I
>>>looked at the packaging and found that these three ICs were purchased
>>>from Tritronics and they didn't appear to be the cheap TT Chinese
>>>knock-offs. I'm at least intelligent enough to knowingly avoid those.
>>>In fact, I noted that I had paid almost nine bucks a piece for these.
>>>So, I went to order some things from Tritronics this evening and searched
>>>the LA7838 on their site. It came-up with several brands all using the
>>>LA7838 and all of them a different price, ranging from a couple of bucks
>>>to eleven plus dollars a piece. So what denotes a knock-off from an
>>>original Sanyo made component when all you have is the price to go by??
>>>None of the brands listed were Sanyo and most of them showed each of the
>>>brand part numbers, Hitachi and Toshiba for example, identifying it as a
>>>LA7838 or OEM part. It's probably how I ordered the last ones - middle
>>>of the road price or manufacturer number.
>>>This makes a about four times in the last month I've had to replace a
>>>component because it was a failure right out of the box.
>>>I'll be calling Tritronics tomorrow but this seems like an epidemic that
>>>obviously could be cured at the supplier's end. Besides, I just hate
>>>wasting money on such a small margin repair as this one.
>>>Anyone else had a similar problems lately with Tritronics parts?
>>>Bill
>>>William Rayburn, CET
>>>Premium Technologies
>>>PO Box 442
>>>Long Beach, WA. 98631
>>>360-642-4993
>>>
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