[TechAssist] Re: Panasonic CT27G5CB Chassis-GP325 (Man 2000)
- From: Jim Myers <jr.myers@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Wed, 11 Aug 2004 16:11:47 -0500
One thing that normally gets zapped in this chassis design is the
optical isolator IC801. It's output is tied in to the action pin of the
micro and if bad it will keep the set from turning on. It can be removed
for test since it is just a OCP device. Also check the associated diodes
D807 and zener D806. The 12V standby goes to IC801 collector.
*******************************************************************************************************************
Since 1972
Jim Myers
Telrad Electronics
Fort Wayne, Indiana
Tel-Tek Electronics wrote:
> Thanks Jim;
> I got the Manual from Bob Waterman.
> I only have about 6.5 Volts at my 12 Volt line. Something is drawing it
> down. If I lift the lead from my supply cap, it goes up to 12 volts.
> Tried jumpering the relay, but no HV.
>
> Various supplies are tapped off of the 12 Volt line, and 5 Volts is one,
> so I suspect bad micro, but not sure.
>
> -Ed-
>
>
> Tel-Tek Electronics
> teltek3@xxxxxxxxxxxx
> Ontario-Canada
>
> -----Original Message-----
> From: techassist-bounce@xxxxxxxxxxxxx
> [mailto:techassist-bounce@xxxxxxxxxxxxx] On Behalf Of Jim Myers
> Sent: Wednesday, August 11, 2004 4:19 PM
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Re: Panasonic CT27G5CB Chassis-GP325 (Man 2000)
>
> Ed, I have a paper manual. Do you have standby voltage at the relay
> coil? Does the base of relay driver Q001 show any change when the power
> switch is pressed? Can you jumper the relay contact pins and get HV?
> ************************************************************************
> *******************************************
> Since 1972
> Jim Myers
> Telrad Electronics
> Fort Wayne, Indiana
>
>
> Tel-Tek Electronics wrote:
>
>> I presume this set had a trickle of lightning. Fuse is not
>>blown, can find no shorts. No Relay click. Just Dead.
>> I have no Manual on this...anyone have any tips and/or Manual?
>>
>>TIA
>>
>>-Ed-
>>
>>Tel-Tek Electronics
>>teltek3@xxxxxxxxxxxx
>>Ontario-Canada
>>
>>
>>
>>
>
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