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

LeRoy.
Video Buffer may be at fault. Not sure Q905 or Q906.
Let you know in the morning.
Front center of chassis.

-Ed-
-- 
Tel-Tek Electronics
Ontario-Canada   

teltek3@xxxxxxxxxxxx
teltek@xxxxxxxxx   


> From: LeRoy Westlund <llw@xxxxxxxxxx>
> Reply-To: <techassist@xxxxxxxxxxxxx>
> Date: Mon, 30 May 2005 18:40:16 -0600
> To: TechAssist <techassist@xxxxxxxxxxxxx>
> 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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