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

I agree, except that the run B+ supply is not djustable. The pot is only 
for the standby supply.

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




J Silverman wrote:

>The average beam current probably goes down a little with the normal signal
>source connected. That may cause the B+ to rise a little and trip an x-ray
>shutdown. If you reduce the B+ a little and this eliminates the shutdown
>that tells you if this is what was happening.
>Jerry Silverman
>Greentron Inc
>4 Newland Ave
>Greenville SC 29609
>Fax/Phone 864 232 3889
>mail to: greentron@xxxxxxx
>----- Original Message -----
>From: "DAMON BRUNGER" <damoneb@xxxxxxxxxxx>
>To: <techassist@xxxxxxxxxxxxx>
>Sent: Tuesday, May 31, 2005 8:06 AM
>Subject: [TechAssist] Re: [ Update ] RCA F35731MB CTC169JS6 - Shuts off when
>signal source is connected.
>
>
>  
>
>>I totally forgot about that.....I think I had to visually remember which
>>    
>>
>way
>  
>
>>the flat edge of the transistor was placed before installing a new one.
>>I suspect the CRT may be pulling too much current, but it isn't the
>>fault...it's gotta be triggering the
>>X-ray or overcurrent sense line some how.
>>Also, if you installed Q2906 backwards you'll need to re - replace it.
>>    
>>
>Been
>  
>
>>there, done that.
>>
>>Damon Brunger
>>Telrad Electronics
>>Fort Wayne IN
>>----- Original Message -----
>>From: "Jim Myers" <jr.myers@xxxxxxxxxxx>
>>To: <techassist@xxxxxxxxxxxxx>
>>Sent: Tuesday, May 31, 2005 5:47 AM
>>Subject: [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
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>                    
>>>>>>>>>>
>>>>>>>----------------------------------------------------------------------
>>>>>>>              
>>>>>>>
>>-
>>    
>>
>>>>-
>>>>
>>>>        
>>>>
>>>>>-
>>>>>
>>>>>          
>>>>>
>>>>>>-
>>>>>>
>>>>>>            
>>>>>>
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>>>>>>>>
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