[TechAssist] Re: Sanyo AVM2758G (G5G-2758G0) AC hum thru picture
- From: "C&W Electronics" <c_w_electronics@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 23 Jun 2003 21:21:48 -0500
Philip,
Try this: disconnect the clk/dta/enable lines to the tuner. Just clear solder
from pins(make sure they are clean), then try the set. If this is the problem,
you will get a slick raster. You may have to turn up the screen to see the
display.
Ran into one today. I would have sworn it was ac hum from the power supply, but
it was the tuner. Who would've thunk it??
Paul W
C&W Electronics
Azle Texas
----- Original Message -----
From: Philip Bader
To: techassist@xxxxxxxxxxxxx
Sent: Monday, June 23, 2003 5:02 PM
Subject: [TechAssist] Sanyo AVM2758G (G5G-2758G0) AC hum thru picture
Two white hum bands slowly moves up thru the picture.When the upper one
gets to the top, the bottom band is showing up.Picture bends in the area
of the bar. I've seen this caused by noise generated in the smps by bad
STR30130's,etc. I changed IC601 (STR30130), all four bridge diodes, the
main filter C606 (470mfd/200V).
Resoldered all over,even jumpered the power relay contacts while
happening,no help.(maybe the contacts were arcing).Takes about 5 min to
show up.I can turn off,then on the power and it instantly clears for a
few minutes.
Gotta be AC power supply hum...
Phil Bader
--
Philip Bader
Jan Phyl TV Inc. (estab. 1976)
3420 Recker Hwy. Winter Haven, Fl. 33880
Fax (863) 299-8821
email: tjanphyl@xxxxxxxxxxxxxxx
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