[TechAssist] [ FIXED ] RCA F35731MB CTC169JS6 - Shuts off when signal source is connected.
- From: "LeRoy Westlund" <llw@xxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 1 Jun 2005 07:04:00 -0600
That fixed it , Wayne !
The emitter voltage was reading .16 with no signal, & .24 with signal.
The voltage on pin 3 was .75 with no signal, &.11 with signal.
The emitter .18 ohm 2 watt resistor (out of a junked chassis) brought my
Emitter voltage down to (.10 & .18), and brought the voltage on pin-3 to
(.05 & .08).
The two other resistors were both within tolorance, so I didn't have to
replace them.
I couldn't measure the .18 ohm resistor, cause I don't have a meter that
will read that low.
All voltages are now correct, and stable. Unit has been running with a
perfect picture now for 1/2 hour.
Thanks to "All" the techs that took the time to responded to my problem.
You were all very helpful. I couldn't have fixed this one without your help.
I really appreciate all the techs on this list.
Thanks, again.
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: Wayne Vanaman <Wayne@xxxxxxxxxxxxxxxxxxxxx>
To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
Date: Tuesday, May 31, 2005 11:28 AM
Subject: [TechAssist] Re: RCA F35731MB CTC169JS6 - Shuts off when
signalsourceis connected.
>LeRoy:
>Pin 3 of the IC should be about .06V. If it is high replace the emitter
>resistor for the Q4101 pn 200183 .18ohms 2w. and check SMD R4109 1K ohms
>and R4108 910 ohms.
>
>Wayne Vanaman
>Omega Electronics
>6904 W Fairfield Dr
>Pensacola, Fl. 32506-3310
>
>Wayne@xxxxxxxxxxxxxxxxxxxxx
>WWW.PensacolaTVRepair.Com
>
>850-456-5995 voice
>850-458-6369 fax
>
>
>LeRoy Westlund wrote:
>> Damon,
>> The CRT is OK, cause I'm running it on a 27" test jig. I left the rest of
>> the set in the home, where it was doing exactly the same thing.
>> The resistors check OK off the emitter of Q4101.
>>
>> You are right about "over currant" shut down being the problem, cause the
>> voltage on the emitter of Q4101 is (.14) without a signal, and goes to
>> ( .24 ) as soon as I connect the antenna on an active station. It should
>> stay at (.14 ).
>> Q2906 voltages are :
>> E-No signal = 4.77 with signal = 4.33
>> B-No signal = 4.71 with signal = 4.27
>> C-No signal = .08 with signal = .18
>>
>> 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: Tuesday, May 31, 2005 7:25 AM
>> Subject: [TechAssist] Re: RCA F35731MB CTC169JS6 - Shuts off when
>> signalsource is connected.
>>
>>
>>
>>><When it shuts off, I have to unplug the power for at least 5 minutes,
>>>before
>>>my standby voltages will return.>
>>>
>>>I have that happen when the SMPS goes into an overvoltage condition or
>>>overcurrent condition....takes time for the SMPS Ic to reset.....when you
>>>unplug the CRT it stops the overcurrent section from activating, and
since
>>>you can run the TV WITHOUT signal practically ALL Day....I think it
>>>eliminates the overvoltage condition.....so you are getting overcurrent
at
>>>the SMPS, and since you have a GooD Picture...it can't be the CRT as far
as
>>>I know.
>>>
>>>You've been through this pretty thoroughly......just need to identify the
>>>reason the PICTURE is causing your SMPS to activate overcurrent
>>>circuitry.....how about those resistors on the SMPS output...the emitter
to
>>>ground resistors?
>>>
>>>I'm having problems believing the X-ray sense is at fault because it DOES
>>>run all day, but it might be triggering....but I would expect you could
>>>unplug it....wait 10 seconds....and it would start. Not 5
minutes.....that
>>
>> 5
>>
>>>minute wait just points to the SMPS overcurrent, plus the part about the
>>>standby voltages not coming up. X-ray won't do that to the standby
>>>obviously....
>>>
>>>Damon Brunger
>>>Telrad Electronics
>>>Fort Wayne IN
>>>----- Original Message -----
>>>From: "LeRoy Westlund" <llw@xxxxxxxxxx>
>>>To: "TechAssist" <techassist@xxxxxxxxxxxxx>
>>>Sent: Monday, May 30, 2005 7:40 PM
>>>Subject: [TechAssist] RCA F35731MB CTC169JS6 - Shuts off when signal
source
>>>is connected.
>>>
>>>
>>>
>>>>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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