Re: Sony Home Cinema Amp STR KSL5 problem


"Davy H" <dave@xxxxxxxxx> wrote in message
news:1137752419.388128.54630@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>I have a SONY a home Cinema system (STR KSL5) which after about 2 mins
> shuts down with the word PROTECT in the display screen. I have checked
> all the speaker outputs and they are fine, no shorts. I have removed
> all the speakers and the same problem occurs. The fan works so doesn't
> seem to be an overheating problem. This PROTECT fault occurs even when
> the volume is turned right down therefore not driving the amp. Anyone
> have any ideas what might cause this fault? and how to rectify it?
>
> Thanks
>
> Davy H
>

Sounds like an overheating (i.e., thermal intermittent) prob to me if it's
shutting down after 2 mins. That the fan is functioning doesn't preclude a
thermal defect in one or more components.

Get a can of component chiller (Freeze-It, et al) and spray each component
in the amp chain, beginning with the higher-current devices at the final
output stages. Allow the chilled part to warm up before proceeding to the
next one.

Alternatively, allow the unit to _fully_ cool, then manually heat components
with a soldering iron or finely tipped heat gun -- some techs use the
reverse (blow) mode of their desoldering guns -- within that 2 minute
window. Be very careful using this approach, as you can destroy a component
if you apply heat to it for too long or otherwise go beyond its designed
safety margins.


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