[TechAssist] Re: Sony KP-61HS30 Chassis RA-6 Gets Darker and Darker....
- From: Kevin <kevintv@xxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 16 Feb 2005 13:32:42 -0800
Go to the member pages, find the Sony RA-6 chassis and ask for a
download of the schematic.
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 Shupe
Sent: Wednesday, February 16, 2005 1:16 PM
To: techassist@xxxxxxxxxxxxx
Subject: [TechAssist] Sony KP-61HS30 Chassis RA-6 Gets Darker and
Darker....
Hi Y'all...
This set starts out with a nice, normal picture, but
as it plays, it gets darker and darker, to the point
where it's hard to see. The set is only about three or
four years old, but I inspected it for bad solder at
the interconnects between the sweep and signal PCB's
and it looks good.
I can warm the area around the jungle chip (IC309
from a cold start and produce the effect more rapidly
than through normal playing, especially if I directly
warm IC309. If I cool IC309, the brightness returns
almost immediately. Problem is, I already replaced it
for that reason, and the problem remains.
I just found out today that I could also get pretty
much the same effect by stimulating the surrounding
chip transistors and a couple of 'lytics near it
(Q374, Q367, C488, C494).Replaced those also, no help.
I don't have a schematic and the customer is getting
upset. Has anyone seen this before or have any
Sony-inspired advice?
TIA
Jim Shupe, CET
Lloyd's TV
Yucca Valley, CA
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