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

OK,...now I'm back to where I started.
Menu is centered OK, speaker got itself shut off for some reason.
I bypassed the PIP module, and it still shuts off.
PIP module is not the problem.
I'm pretty sure I'm looking at a luminance driver problem.
Can Q2906 cause this, also ? I'll check that next.

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: LeRoy Westlund <llw@xxxxxxxxxx>
To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
Date: Monday, May 30, 2005 11:50 PM
Subject: [ Update ] RCA F35731MB CTC169JS6 - Shuts off when signalsource is
connected.


>I lost some ground after working on the PiP module.
>I replaced U4 (+5 volt reg.), & R72 (25 ohms).
>Set still shut off.
>
>The problem shifted a little. I lost my sound, and the Menu shifted too far
>to the left.
>Now I have to go back and change the Horz caps as needed, again.
>In the meantime,.....does anybody have a good used PiP module for this
>chassis ?
>Numbers on module are: 506107, 2079001-011, & 4W81034-201.
>
>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: LeRoy Westlund <llw@xxxxxxxxxx>
>To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
>Date: Monday, May 30, 2005 9:43 PM
>Subject: [TechAssist] Re: RCA F35731MB CTC169JS6 - Shuts off when
>signalsource is connected.
>
>
>>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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