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

Watch the board markings closely on that Q2906 LeRoy, seems to me it may 
be marked one way on top and different on bottom.


********************************
Since 1972                     *
Jim Myers                      *
Telrad Electronics             *
Fort Wayne Indiana             *
********************************


LeRoy Westlund wrote:
> 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
>>>>>>>
>>>>>>>
>>>>>
>>>>>>-----------------------------------------------------------------------
> 
> -
> 
>>-
>>
>>>-
>>>
>>>>>---
>>>>>
>>>>>>>This Email List is Public. Remove:
>>>
>>>http://www.tech-assist.org/remove.htm
>>>
>>>>>>>Lost Password: http://www.tech-assist.org  and select "Login
>>>
>>>Problems?".
>>>
>>>>>>>Appliance Repair List:
>>>>>
>>>>>http://www.tech-assist.org/secure/tip/chatjoin.htm#app
>>>>>
>>>>>>>Email Archives: http://www.freelists.org/archives/techassist/
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>
>>>>>------------------------------------------------------------------------
> 
> -
> 
>>-
>>
>>>-
>>>
>>>>>--
>>>>>
>>>>>>This Email List is Public. Remove:
>>
>>http://www.tech-assist.org/remove.htm
>>
>>>>>>Lost Password: http://www.tech-assist.org  and select "Login
>>
>>Problems?".
>>
>>>>>>Appliance Repair List:
>>>>>
>>>>>http://www.tech-assist.org/secure/tip/chatjoin.htm#app
>>>>>
>>>>>>Email Archives: http://www.freelists.org/archives/techassist/
>>>>>>
>>>>>
>>>>>-----------------------------------------------------------------------
> 
> -
> 
>>-
>>
>>>-
>>>
>>>>---
>>>>
>>>>>This Email List is Public. Remove:
> 
> http://www.tech-assist.org/remove.htm
> 
>>>>>Lost Password: http://www.tech-assist.org  and select "Login
> 
> Problems?".
> 
>>>>>Appliance Repair List:
>>>>
>>>>http://www.tech-assist.org/secure/tip/chatjoin.htm#app
>>>>
>>>>>Email Archives: http://www.freelists.org/archives/techassist/
>>>>>
>>>>
>>>>
>>>>-------------------------------------------------------------------------
> 
> -
> 
>>-
>>
>>>--
>>>
>>>>This Email List is Public. Remove: http://www.tech-assist.org/remove.htm
>>>>Lost Password: http://www.tech-assist.org  and select "Login Problems?".
>>>>Appliance Repair List:
>>>
>>>http://www.tech-assist.org/secure/tip/chatjoin.htm#app
>>>
>>>>Email Archives: http://www.freelists.org/archives/techassist/
>>>>
>>>
>>>--------------------------------------------------------------------------
> 
> -
> 
>>--
>>
>>>This Email List is Public. Remove: http://www.tech-assist.org/remove.htm
>>>Lost Password: http://www.tech-assist.org  and select "Login Problems?".
>>>Appliance Repair List:
>>
>>http://www.tech-assist.org/secure/tip/chatjoin.htm#app
>>
>>>Email Archives: http://www.freelists.org/archives/techassist/
>>>
>>
> 
> -----------------------------------------------------------------------------
> This Email List is Public. Remove: http://www.tech-assist.org/remove.htm
> Lost Password: http://www.tech-assist.org  and select "Login Problems?".
> Appliance Repair List: http://www.tech-assist.org/secure/tip/chatjoin.htm#app
> Email Archives: http://www.freelists.org/archives/techassist/
> 
-----------------------------------------------------------------------------
This Email List is Public. Remove: http://www.tech-assist.org/remove.htm
Lost Password: http://www.tech-assist.org  and select "Login Problems?".
Appliance Repair List: http://www.tech-assist.org/secure/tip/chatjoin.htm#app
Email Archives: http://www.freelists.org/archives/techassist/

Other related posts: