[TechAssist] Re: RCA F35731MB CTC169JS6 - Shuts off when signal source is connected.

Isn't this the SMPS's emitter voltage?
<Voltage  Q4101-Base = standby = -.19 ( Run = -1.4)>
I wonder if it is.

Damon Brunger
Telrad Electronics
Fort Wayne IN
----- Original Message -----
From: "LeRoy Westlund" <llw@xxxxxxxxxx>
To: "TechAssist" <techassist@xxxxxxxxxxxxx>
Sent: Monday, May 30, 2005 7:40 PM
Subject: [TechAssist] RCA F35731MB CTC169JS6 - Shuts off when signal source
is connected.


> Hi members,
> This set will run all day with raster only. As soon as I hook up a signal
> source (Antenna, or external input), it will shut off after about 10
> seconds. Picture is beautiful, and all voltages from the power supply read
> normal, for that length of time.
> When it shuts off, I have to unplug the power for at least 5 minutes,
before
> my standby voltages will return.
>
> Parts replaced so far, with OEM part numbers :
> Regulater chopper output. (200165)
> Regulator IC (200419)
> Regulator caps. (2.2 @ 100 195691),(15 @ 63 214756),(470 @ 35 190496),(39
@
> 100)
> Horz cap (.48 @ 250 197518), CR4118 (164589), C4703 (47 @ 250).
> B+ cap (470 @ 180 200147).
> Tested luminance buffer Q2906= OK.
>
> Voltage readings:
> B+ = standby = 143.2 (Run = 138.2)(adjusted B+ standby for 140, no help).
> CR4118 = standby = 13.4 ( Run = 12.1)
> Voltage  Q4101-Base = standby = -.19 ( Run = -1.4)
>
> If I pull the CRT socket, set will run OK, and not shut-off.
> Works the same on my 27" test jig in the shop, as it does hooked up in the
> home, to the original Yoke / CRT load combination.
>
> Would it be wise to replace the IFT at this stage of the game ? Customer
> does not want to spend more then $200 for this repair. I may need to
refund
> about $100-165, that I already collected. It worked for about 1/2 hour
when
> I first took it back, but, it went out again after customer already paid
me.
>
> Anymore help on this would be appreciated.
> LLW
>
> LeRoy Westlund
> Westlund TV & Electronics
> 97 North Main                             " I forgot,..to remember,..
> Centerfield, UT 84622-0087           to forget "
> Ph./Fax  435-528-3822
> mailto:LLW@xxxxxxxxxx
>
>
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