[TechAssist] Re: Sony KV-32FS13 OSD Channel Display Keeps Scanning
- From: Panday <dpanday@xxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 23 Jul 2003 15:00:08 -0400
SUBJECT: Stuck in menu mode
Symptom: Turn set on and up comes customer menu and you can't do any other
feature.
Solution: The fact that the CPU will turn the set on is a very good indicator
that it is more than likely working OK. 2
items must be checked that will cause the functions to lock up.
1. The I2C bus clock and data lines must be checked for 4.6VDC and the load
problem taken care of if
either of these lines are low.
2. A CPU which is locked up on an external command such as a stuck button or
corrosion on one of the
buttons or the resistor ladder. (caused by the envioment the set is in). Try
pressing front panel buttons
simultaneously in different sequences and see if you can get the unit to change
into any function. This
is a good indicator of corrosion.
3. Zener diodes on the key lines can become defective causing a voltage to be
lower then it should. The
CPU translates this voltage to a wrong command.
4. Always check clock and data lines for proper voltage. Hight resistance
leakage or a stuck buton is next in line.
Panday
>
> From: Quality Video Service <BTSteve@xxxxxxx>
> Date: 2003/07/22 Tue PM 01:22:20 EST
> To: TechAssist <techassist@xxxxxxxxxxxxx>
> Subject: [TechAssist] Sony KV-32FS13 OSD Channel Display Keeps Scanning
>
> Hi fellow techs.
> Have what I would say is an interesting one here!
> Set comes on, locks to channel, however the OSD channel numbers just
> keep on scanning! Like I said, the tuner locks to the channels and the
> set yields a good picture and sound, but the OSD display keeps scanning!
>
> Also, some of the bottom commands seem to be "confused".
> I have unplugged the button assy at the top of the set, with the same
> results.
> Also, I am unable to get to the menu via the buttons on the chassis.
> Anyone have any ideas?
> Thanks for your input..... and believe me..... I need it too!
>
> --
> Steve Rumel
> Quality Video Service
> Professional Service for your Audio and Video Equipment
> 7008 Long Point Houston, Tx. 77055
> 713-956-2400 713-956-2403 FAX
> qualityvideo@xxxxxxx
> http://profiles.yahoo.com/qualityvideoservice
> Other life :-)
> Col Steve Rumel, CAF
> Crew Chief, BT-13A
> West Houston Squadron
> Visit My Yahoo! Group: Vultee Valiant
> http://groups.yahoo.com/group/vulteevaliant/
>
>
>
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