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

Hi Leroy,

What is your high voltage running at? Is the picture geometry OK? not 
bowed in or out on the sides?
The next thing I would do is to change the rest of the horizontal output 
caps. Sorry, I don't have the part numbers here, but someone will 
probably jump in with them. I think it is C4401, C4402, C4406)?
I'm thinking the timing of the hor output might be off.

John Myers
Myers TV Service Co.
376 E. State St.
Alliance, OH 44601

Voice / Fax: 330-821-6545
Myers_tv_b@xxxxxxxxxxxxx
http://www.myerstv.net

Work as if you were to live a hundred years,
Pray as if you were to die tomorrow.
                           Ben Franklin




LeRoy Westlund wrote:

>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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