[TechAssist] Re: RCA P61310YX1, DTV307 chassis, standby sypply will not start.
- From: Jim Myers <jr.myers@xxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Tue, 19 Oct 2004 16:04:07 -0500
Thanks but already did all that, talked to tech line again today, no
help, shipping it to TSM, we'll see if they get it fixed.
*******************************************************************************************************************
Since 1972
Jim Myers
Telrad Electronics
Fort Wayne, Indiana
Lakeside TV wrote:
> Jim, the last one I worked on wouldn't start. We normally change about a
> dozen parts when the standby supply blows. Some may be CYA but no callbacks.
> Also check CR14108 and R14106 (causes intermittent startup) and per Peggy at
> Thomson remove C14130 (surface mount next to Q14601) and scrape glue. do not
> replace it. also change R14608.
>
> Bob Norcross
> Lakeside TV Service, Inc.
> Clinton Township, MI 48038
> Jim Myers <jr.myers@xxxxxxxxxxx> wrote:
> Q14601 was blown with a burn through its case, I have replaced Q14601,
> CR14613, CR14615, CR14602, CR14611, R14604, Q14602 and Q14603, Also I
> have checked all other parts in the supply and checked for shorts on the
> outputs. Darn thing just does not try to start. I've called the RCA tech
> line twice about it. The last call they said I must replace all three
> transistors at the same time so I ordered two sets and replaced all
> three. Still it will not start, it does not even twitch or jiggle when I
> apply AC. I monitor Q14601 with scope and one of the output side diodes
> with meter and flip the variac on and nothing. Q14601 always has about
> 12.5 volts on it's gate and zero on the source. The RCA tech says this
> means the transistor is open. If this were not a FET I would agree. Are
> all the new ones bad? I have installed three new ones now. Has anyone
> had this experience?
> Thanks,
> *******************************************************************************************************************
> Since 1972
> Jim Myers
> Telrad Electronics
> Fort Wayne, Indiana
>
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