[TechAssist] Re: RCA F35731MB CTC169JS6 - Shuts off when signalsource is connected.
- From: "LeRoy Westlund" <llw@xxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Mon, 30 May 2005 21:41:00 -0600
Damon,
I already replaced the B+ cap. (470 @ 180).
Right now, I am looking at the PiP module.
R72 is overheated, and the +5 volt reg. IC4 may be bad.
If I unplug P8002, the set will run with normal audio, but of course it has
no picture, so it don't shut down. I'm going to try a new +5 volt reg. IC4
on the PiP module.
Later,
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
-----Original Message-----
From: DAMON BRUNGER <damoneb@xxxxxxxxxxx>
To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
Date: Monday, May 30, 2005 8:48 PM
Subject: [TechAssist] Re: RCA F35731MB CTC169JS6 - Shuts off when
signalsource is connected.
>Hmmm, I'm not sure if that Hi Voltage is normal or not. I've never tested
>the normal value on this set.
>200V is a little low, Cr4118's 12V should be 14V after replacement, and I
>think you said the B+ run was at 140V, which is a little low too....not
much
>tho'.
>
>Put your meter on the 143V diode located near the SMPS. It's closer to the
>SMPS than the back of the chassis, located kinda parallel to the Horiz heat
>sink. Monitor the voltage for a few minutes. If you see that voltage
>fluctuate by several volts then the 143V cap is dried out......that voltage
>should be rock solid 143V during run at all times.
>I have had that cap cause all sorts of shutdown/turn on problems, and I 've
>just been seeing those go bad during the last 6 months.
>
>Damon Brunger
>Telrad Electronics
>Fort Wayne IN
>----- Original Message -----
>From: "LeRoy Westlund" <llw@xxxxxxxxxx>
>To: <techassist@xxxxxxxxxxxxx>
>Sent: Monday, May 30, 2005 9:03 PM
>Subject: [TechAssist] RCA F35731MB CTC169JS6 - Shuts off when signal source
>is connected.
>
>
>> John,
>> The Hi-voltage reads 31K.
>> The 200 volt source reads 191.8 volts.
>> The screen reads 312 volts.( turning it down, does not help ).
>> Picture Geometry is perfect. Picture is NOT bowed. Looks perfect.
>>
>> 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
>>
>> -----Original Message-----
>> From: John @ Myers TV <myers_tv_b@xxxxxxxxxxxxx>
>> To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
>> Date: Monday, May 30, 2005 7:07 PM
>> Subject: [TechAssist] Re: RCA F35731MB CTC169JS6 - Shuts off when
>> signalsource 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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