[TechAssist] Re: Mitsubishi CS-31303, no vertical deflection.
- From: Jim Myers <jr.myers@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Thu, 23 Jun 2005 11:58:32 -0500
Ok, I replaced the output chip and a couple of dry lytics, no change,
still no vertical deflection. No drive signal on the input, pin 4, and I
can trace the circuit path a little, seems to come from the A/V board.
If anyone has a schematic tell me where the vertical drive comes from if
you can take the time to look.
Thanks,
********************************
Since 1972 *
Jim Myers *
Telrad Electronics *
Fort Wayne Indiana *
********************************
tjanphyl@xxxxxxxxxxxxxxx wrote:
> Well it's not unreasonable to speculate a shorted IC may shunt an
> otherwise good signal to ground. Also many sets sense an inoperative
> vertical ckt and a sense line kills all scal drive as a safety
> measure. I will try to find out which pin the jungle uses for drive.
> Can you tell me the VJC's part number on it? (TDA???,or LAxxx)etc
> Phil
>
> ----- Original Message -----
> From: Jim Myers <jr.myers@xxxxxxxxxxx>
> Date: Saturday, June 18, 2005 1:42 pm
> Subject: [TechAssist] Re: Mitsubishi CS-31303, no vertical deflection.
>
>
>>Yes, replacing the resistor did restore VCC to the chip and no I
>>did not
>>replace the output IC yet since I will have to order it. I am sure
>>that
>>a vertical drive signal is required for the output IC to produce
>>deflection and there is none on any of the 9 pins so I would like
>>to
>>know where this drive signal comes from since I will probably have
>>to
>>order two IC's.
>>Guess I'm so used to reading between the lines now I'm starting to
>>write
>>between the lines too. Sorry about the omitted information.
>>
>>
>>********************************
>>Since 1972 *
>>Jim Myers *
>>Telrad Electronics *
>>Fort Wayne Indiana *
>>********************************
>>
>>
>>Phil Bader wrote:
>>
>>>First, did replacing the resistor RESTORE Vcc to the chip? I
>>
>>would
>>
>>>assume so, but you didn't say. The open resistor would confirm a
>>
>>bad
>>
>>>vert output. You also omitted if you changed the IC401, which
>>
>>should be
>>
>>>automatically done in this case before going on to other
>>
>>possibilities..> Let us know.
>>
>>>Phil Bader
>>>
>>>Philip Bader
>>>Jan Phyl TV Inc. (estab. 1976)
>>>3420 Recker Hwy. Winter Haven, Fl. 33880
>>>Fax (863) 299-8821
>>>email: tjanphyl@xxxxxxxxxxxxxxx
>>>
>>>
>>>
>>>Jim Myers wrote:
>>>
>>>
>>>
>>>>Found R570 open and no 28V to vertical IC401, replaced it but
>>
>>still no
>>
>>>>vertical. I don't see any drive signal to IC401 a TA8427K. Any
>>
>>tips for
>>
>>>>this problem?
>>>>
>>>>Thanks,
>>>>
>>>>********************************
>>>>Since 1972 *
>>>>Jim Myers *
>>>>Telrad Electronics *
>>>>Fort Wayne Indiana *
>>>>********************************
>>>>
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