[TechAssist] Re: Semiconductor purchasing question
- From: "Tel-Tek Electronics" <teltek3@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 7 Oct 2005 06:43:41 -0400
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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