[TechAssist] Re: Sony KV25FV300 BA6 Dead-shutdown
- From: Jim Myers <jr.myers@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sun, 15 Jan 2006 06:46:44 -0500
Peter, this sounds like it could be the same type failure that ate my
lunch for two days this past week working on a KV27FS320. I tried all
those things too then tried jumping the main relay RY600 and found that
the set worked perfectly. The bias voltage to the base of the relay
driver transistor was being pulled down by the OCP circuit and that
would turn the set off as soon as it turned on. If this trick works take
a look at the OCP circuit Q590, there should be no voltage on it's
collector and in the set I had R595 was open and caused a false OCP
shutdown. Do you have the manual?
The Old Master Technician
********************************
Since 1972 *
Jim Myers *
Telrad Electronics *
Fort Wayne Indiana *
********************************
Peter oliver wrote:
> open circuit B+ at HOT collector is 136v (before shutdown), negiable voltage
> with the HOT in circuit, it tests ok out of circut, set shows the 2 blink
> symptom even if the HOT is removed, or vert Ic unsoldered CRt board pulled -
> disconnected, Ic 1751 pulled, yoke pulled. Ic600 does not appear shorted,
> R600 OK, no holes apparent in the HOT,
>
> Peter Oliver
> Tucson Radio TV
>
>
> From: "Peter oliver" <oliver_peter1@xxxxxxxxxxx>
> Reply-To: techassist@xxxxxxxxxxxxx
> To: techassist@xxxxxxxxxxxxx
> Subject: [TechAssist] Sony KV25FV300 BA6 Dead-shutdown
> Date: Fri, 13 Jan 2006 04:25:12 +0000
>
> Sony
> KV25FV300
> BA6
> (made in mexico purchased at costco in mexico)
>
> Set has the symptom of push power seems to attempt to start, sort of,
> never gets to the HV flux up stage. Then goes to shutdown 2 blink 4sec 2
> blink, then after a while the blinking stops. HOT is not shorted, Have
> tested CRT IC and tried with CRT IC removed, have rung yoke and flyback they
> seem ok. still acts same. Ideas?
>
> Peter Oliver
> Tucson Radio TV
>
>
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