[TechAssist] Re: Sony KV27FS100 AFT hunting
- From: "Damon" <damon101@xxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Tue, 10 Aug 2004 21:08:14 -0500
We've seen a few AFT problems on Sonys but you're looking in the wrong place
as the AFT circuit is on the Micro Ic001...
Here's a list of pins to check:
1- V pulse
2- H pulse (these 2 are likely used for OSD)
44- H sync
43- Sub H sync (these 2 are most likely used for aft on main and sub tuners)
39- Sub AFT
40- AFT (these are labled as inputs on the schematics so I would suspect
that the voltage source is located in or near the tuner itself).
HTH
Damon Brunger
Telrad Electronic Services
Ft Wayne, IN 46815
----- Original Message -----
From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxx>
To: "Techassist" <techassist@xxxxxxxxxxxxx>
Sent: Tuesday, August 10, 2004 11:23 AM
Subject: [TechAssist] Sony KV27FS100 AFT hunting
| I have a Sony KV27FS100 that the customer brought in for the complaint of
| intermittently the set will display "No Signal" which is accompanied by a
| loss of sync and audio dropout (muting due to the undetected signal). I
had
| replaced the tuner which made no difference. I then replaced the jungle IC
| (CXA2154AS) which when turned on looked great. As I began channel surfing,
I
| noticed that the picture takes a few seconds to lock in as it appears to
be
| in some sort of AFT hunt when a new channel is selected. I carefully went
| back over all my work with jeweler's googles and even the high powered
loupe
| and found no solder splashes or bridges and no evidence of hairline
| fracture. I then replaced the tuner first and the jungle IC again with no
| difference. I cannot find any adjustments or alignments to correct this.
All
| voltages are normal. There is nothing listed for tips on the Sony website
or
| in WINSTIPS. Has anyone else experienced this with this chassis?
|
| Bob Waterman, CET® #RI-28
| Master Technician License #9109
| Service Manager / Parts Manager
| Gemini Computer, TV, & Security Alarms
| (508)695-7302
| (508)695-7769 FAX
| geminitv@xxxxxxxxxxx
| geminitv@xxxxxxx
| www.geminicomputertvsecurityalarms.com
|
|
|
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