[TechAssist] Re: Sony KP-61HS30 Chassis RA-6 Gets Darker and Darker....
- From: "Shoreline Electronics" <jstielau@xxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 16 Feb 2005 17:20:44 -0500
The signal board is a double sided type with plated thru feed thrus.
I would resolder all the connections at the interconnects and also resolder
all the standup modules , resolder the board sockets and the modules.
Spray a light coating of contact cleaner on these before reassembly.
Might help!
=================================
Jeff Stielau
Shoreline Electronics Repair
344 East Main Street
Clinton,CT 06413
(860)399-1861
(860)664-3535 FAX
jstielau@xxxxxxxx
=================================
----- Original Message -----
From: "Jim Shupe" <jim@xxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Wednesday, February 16, 2005 4:15 PM
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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