[TechAssist] Re: Sony KV20V80 plug in,dead, only "thump-thump" from spkrs.
- From: Jim Myers <jr.myers@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 07 Dec 2004 15:50:54 -0500
Try this on for size, see if it fits.
There was a loud thump from the speakers when the unit was plugged in.
The unit would not turn on. The 9V line did not switch on. We found that
the CPU was not issuing a power on command - or anything else.
The 9V line did not switch on. We found that the CPU was not issuing a
power on command - or anything else.
The cause was the Reset/IC002. It was holding the reset line low.
Replacement of IC002 resolved the problem.
*******************************************************************************************************************
Since 1972
Jim Myers
Telrad Electronics
Fort Wayne, Indiana
al m wrote:
> Only thing I can think is to check the caps in the primary reg. circuit.
> Al Marquardt
> ampm@xxxxxxx
> Al Marquardt Electronic Repair
> 206 W Main
> Girardville Pa. 17935
> ----- Original Message -----
> From: "Phil Bader" <tjanphyl@xxxxxxxxxxxxxxx>
> To: <techassist@xxxxxxxxxxxxx>
> Sent: Tuesday, December 07, 2004 3:01 PM
> Subject: [TechAssist] Sony KV20V80 plug in,dead, only "thump-thump" from
> spkrs.
>
>
>
>>Plug it in, a fairly loud "thump-thump-thump" thru the speakers.
>>Otherwise dead. Has +5V standby, +109vdc on collector HOT. Replaced main
>>filter, no help.Any suggestions?
>>Phil Bader
>>
>>--
>>
>>Philip Bader
>>Jan Phyl TV Inc. (estab. 1976)
>>3420 Recker Hwy. Winter Haven, Fl. 33880
>>Fax (863) 299-8821
>>email: tjanphyl@xxxxxxxxxxxxxxx
>>
>>
>>
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