[TechAssist] Re: Sanyo DS19380
- From: "Bob@Bobs tv" <woodman1@xxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 29 Mar 2004 09:41:10 -0500
Steve,
Start by checking voltages when the set is not working, like at
video chip and tuner.. I have found on some of the Sanyo's they put more
paint on the board then copper on the traces.. Found a few by scraping the
paint off and following traces back to there source. I have even used the
Dick Smith ESR meter following the traces back, very accurate for low ohm
testing...
Bob,
Bobs TV Worcester, ma
woodman1@xxxxxxxx
Main 508-853-1482
Fax 508-853-1480
----- Original Message -----
From: "Technotronic Dimensions" <steve@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, March 27, 2004 7:36 PM
Subject: [TechAssist] Re: Sanyo DS19380
> Well, I thought I had this liked, but problem is back. Just has no RF
Input
> at all with black Screen when it fails.
> I replaced the 33KResistor anyway near tuner although it tested ok - was
> R104 I think, Defluxed the heck out of the PCB....resoldered all the IC's,
> and IF Coils
> and other items that look RF Related....still have problem.
>
> Thought problem was Intermittent - Still not sure. If I put the unit on
> after its unplugged a While, the problem is usually there. If I flex the
> board a little on the end hanging off the plastic Tracks, the Signal comes
> on fine. Thing Is I cant seem to make it go off by flexing the board some
> more. At one point I had it all buttoned up, playing fine ready to release
> to Cust, and I tilted the TV backwards to get something under it, and it
> quit. It did seem to put pressure on the RF Connector on the REAR a little
> when I did this....but after moving that around in every direction I can
> think of - Still cant make it come or Go....? Any ideas? The Connector is
> part of one of those Can Type assemblies that have a Cap inside, and an
RCA
> Jack wire on the other End. There is a 33 MEG Resistor in series with the
> Shield on this assy which I mentioned earlier. Apparently, the Tuner
Ground
> Conflicts severely with earth ground as I discovered before....hence the
> Resistor. Could the Resistor be dropping the Signal too much? I did
replace
> it anyway with another 33 MEG Just to be sure. Would it be safer to go
> lower, perhaps 10 MEg?
>
> Steve Hearns
> Technotronic Dimensions, NY [USA]
> WWW.TECHNOTRONIC-DIMENSIONS.COM
> 1-877-817-9885 (Voice / Fax Toll Free - US Only)
>
>
> ----- Original Message -----
> From: "Technotronic Dimensions" <steve@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, March 26, 2004 8:53 PM
> Subject: [TechAssist] Re: Sanyo DS19380
>
>
> Hey Thanks Randy. Sure enough, that was all was wrong.
>
> I did find however after I resoldered the Entire Tuner, I again had
> Stations, but they all went out again after playing about 4-10 mins.
>
> I decided to Flex the Main PCB, and sure enough, my stations Came back. I
> resoldered the Jumper Wires on the PCB that Lead to the Tuner Pads, and
also
> after tracing them to their destination, found they were going to the Main
> Micro, which looked like it was badly soldered. After all the resoldering,
I
> have a Solid Repair.
>
> Steve Hearns
> Technotronic Dimensions, NY [USA]
> WWW.TECHNOTRONIC-DIMENSIONS.COM
> 1-877-817-9885 (Voice / Fax Toll Free - US Only)
>
>
> ----- Original Message -----
> From: "Randy Evans" <tvsvc2000@xxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Friday, March 26, 2004 7:52 PM
> Subject: [TechAssist] Re: Sanyo DS19380
>
>
> For a Sanyo DS19390 model...........
>
> 3.3 10% 6W Wirewound 402 058 4403
>
> Randy Evans
> VCR SERVICE
> 708 Linwood Street
> Delta, Ohio 43515
>
>
> Technotronic Dimensions <steve@xxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
> Was Working on the Tuner on this, and accidently bypassed the 33 Meg
> Resistor in line with Antenna Shield and Tuner Shield. Set dead now , just
> has Relay Click.
> R601 is a Square Ceramic Standoff Resistor With Markings: 3R3 , reads
> totally open. Its in line with the Relay contacts..and is hopefully all
that
> is wrong.
>
> Can anyone Verify this is about the correct value I am guessing : 3 Ohms ,
3
> Watts?
>
> Steve Hearns
> Technotronic Dimensions, NY [USA]
> WWW.TECHNOTRONIC-DIMENSIONS.COM
> 1-877-817-9885 (Voice / Fax Toll Free - US Only)
>
>
>
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