[TechAssist] Re: RCA Projection PTK169PTA U4101 prob. (no stdby voltages)FIX?
- From: "Gemini Computer & TV" <geminitv@xxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 3 Oct 2003 13:54:30 -0400
Okay then, as I said before, about 165 - 170 volts in standby and 143v in
run. Sound very normal to me. How long have you had it up and running? I
fix most of mine in the customer's home. However, if it were one I had in
the shop, I always let them for for three days before releasing them to the
customer just to be sure. I hate a recall because of haste (and it doesn't
look good to the customer either).
Bob Waterman, CET® #RI-28
Master Technician License #9109
Service Manager / Parts Manager
Gemini Computer, TV, & Security Alarms
(508)695-7302
(508)695-7769 FAX
geminitv@xxxxxxxxxxxxxxxx
geminitv@xxxxxxx
www.geminicomputertvsecurityalarms.com
----- Original Message -----
From: "Larry Eastman" <videotech@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, October 03, 2003 1:25 PM
Subject: [TechAssist] Re: RCA Projection PTK169PTA U4101 prob. (no stdby
voltages)FIX?
> Bob, the one listed in the subject line, PTK169PTA, sorry for the
> confusion, I shouldn`t
> have mentioned the direct view in this post, Larry E
> Larry Eastman
> American TV & Electronics
> Crystal River, Fl. 34428
>
> Gemini Computer & TV wrote:
>
> >Larry,
> >Which set are you referring to?
> >
> >Bob Waterman, CET® #RI-28
> >Master Technician License #9109
> >Service Manager / Parts Manager
> >Gemini Computer, TV, & Security Alarms
> >(508)695-7302
> >(508)695-7769 FAX
> >geminitv@xxxxxxxxxxxxxxxx
> >geminitv@xxxxxxx
> >www.geminicomputertvsecurityalarms.com
> >
> >
> >----- Original Message -----
> >From: "Larry Eastman" <videotech@xxxxxxxxxxxx>
> >To: <techassist@xxxxxxxxxxxxx>
> >Sent: Friday, October 03, 2003 12:18 PM
> >Subject: [TechAssist] Re: RCA Projection PTK169PTA U4101 prob. (no stdby
> >voltages)FIX?
> >
> >
> >>Bob, standby regulated B+ should be approx. 140 volts not 170 right ? I
> >>replaced CR4122
> >>C4141 checks good for leakage and esr, C4151 checks good , voltages on
> >>Q4105 are
> >>perfect, I`ll check around the error amp circuit. The strange thing to
> >>me is that nothing runs
> >>hot when I run the set, but I don`t want to send it out and have it fail
> >>in a week, thanks for
> >>your reply, Larry E
> >>Larry Eastman
> >>American TV & Electronics
> >>Crystal River, Fl. 34428
> >>
> >>Gemini Computer & TV wrote:
> >>
> >>>Larry,
> >>>The one you have fixed sounds very normal to me for standby and run B+
> >>>voltages. For the others with B+ at 275 volts (you say you replaced the
> >>>regulator IC and associated caps already), check the following
> >>>
> >components:
> >
> >>>CR4122 (3v, 1watt zener diode, RCA# 200158)
> >>>C4141 (470mfd/180v)
> >>>C4151 (1000pf, 50v, RCA# 181460)
> >>>Q4105 RCA# 143802 (and other transistors in this error amp circuit).
> >>>
> >>>Bob Waterman, CET® #RI-28
> >>>Master Technician License #9109
> >>>Service Manager / Parts Manager
> >>>Gemini Computer, TV, & Security Alarms
> >>>(508)695-7302
> >>>(508)695-7769 FAX
> >>>geminitv@xxxxxxxxxxxxxxxx
> >>>geminitv@xxxxxxx
> >>>www.geminicomputertvsecurityalarms.com
> >>>
> >>>
> >>>----- Original Message -----
> >>>From: "Larry Eastman" <videotech@xxxxxxxxxxxx>
> >>>To: <techassist@xxxxxxxxxxxxx>
> >>>Sent: Friday, October 03, 2003 9:42 AM
> >>>Subject: [TechAssist] Re: RCA Projection PTK169PTA U4101 prob. (no
stdby
> >>>voltages)FIX?
> >>>
> >>>
> >>>>Al, have changed that cap twice in both of the sets I have, Larry E
> >>>>Larry Eastman
> >>>>American TV & Electronics
> >>>>Crystal River, Fl. 34428
> >>>>
> >>>>al m wrote:
> >>>>
> >>>>>The only time I had that much voltage in standby the 2.2mf 100V cap
> >>>>>
> >fixed
> >
> >>>>>it.
> >>>>>Al Marquardt
> >>>>>ampm@xxxxxxx
> >>>>>Al Marquardt Electronic Repair
> >>>>>206 W Main
> >>>>>Girardville Pa. 17935
> >>>>>----- Original Message -----
> >>>>>From: "Larry Eastman" <videotech@xxxxxxxxxxxx>
> >>>>>To: <techassist@xxxxxxxxxxxxx>
> >>>>>Sent: Thursday, October 02, 2003 6:50 PM
> >>>>>Subject: [TechAssist] Re: RCA Projection PTK169PTA U4101 prob. (no
> >>>>>
> >stdby
> >
> >>>>>voltages)FIX?
> >>>>>
> >>>>>
> >>>>>>Hi guys, I found it, thanks for all the replies, the problem was the
> >>>>>>chopper emitter
> >>>>>>resistor R4110 .18 Ohm 2 watt was open so of course no signal from
it
> >>>>>>to U4101. The set runs with a normal picture , problem is, regulated
> >>>>>>
> >B+
> >
> >>>>>>at Cr4116 or Collector of HOT, whichever
> >>>>>>you prefer is 170 volts in standby, when running it is 143 volts???
I
> >>>>>>have rechanged C4108,
> >>>>>>the 5.6 v zener is perfect, all the caps in the switchmode were
> >>>>>>
> >changed
> >
> >>>>>>the first time around,
> >>>>>>I now have 2 sets in the shop with this same problem, the other sets
> >>>>>>standby regulated B+
> >>>>>>goes all the way up to 275 volts and yes I am using the correct
> >>>>>>
> >ground.
> >
> >>>>>>ANY ideas??? None
> >>>>>>of the parts appear to be running hot, please help if you`ve
corrected
> >>>>>>this problem before, tia,
> >>>>>>Larry E
> >>>>>>
> >>>>>>
> >>>>>>Larry Eastman wrote:
> >>>>>>
> >>>>>>>Hi Guys, I`ve got this 169 PTA light box in the shop that`s got no
> >>>>>>>secondary voltages,
> >>>>>>>obviously I`ve got a problem with U4101 not driving the chopper.
Set
> >>>>>>>came in with fuse,
> >>>>>>>R4001 surge resistor, chopper, and U4101 shorted, replaced (with
oem
> >>>>>>>parts) these
> >>>>>>>parts as well as C4102,4104, 4108, Cr4118 and now I don`t have any
> >>>>>>>regulated B+ standby
> >>>>>>>voltages. Raw B+ is at 160 volts, checked all parts between pin 14
> >>>>>>>
> >of
> >
> >>>>>>>U4101 and base of chopper
> >>>>>>>pulled CR4116 to unload the reg. B+ to the HOT and still can`t get
> >>>>>>>
> >>>U4101
> >>>
> >>>>>>>to send pulses to base of chopper, I have the fluctuating 7-9 volts
> >>>>>>>
> >on
> >
> >>>>>>>pin 16 of U4101 and it`s on cathode of CR4101
> >>>>>>>but voltage only reads .3 volts on cathode of CR4106 and supposedly
> >>>>>>>
> >the
> >
> >>>>>>>cathodes of these
> >>>>>>>2 diodes are supposed to be within 1 volt of each other, I assume
> >>>>>>>
> >this
> >
> >>>>>>>is where my problem
> >>>>>>>is but can`t find it, I`ve pulled J1903 from the audio board and
> >>>>>>>
> >J1001
> >
> >>>>>>>from the PTV aux board
> >>>>>>
> >>>>>>>so they are not the problem, any ideas??? I don`t have any at this
> >>>>>>>point, tia, Larry E
> >>>>>>>Larry Eastman
> >>>>>>>American TV & Electronics
> >>>>>>>Crystal River, Fl. 34428
> >>>>>>>www.tvjunkyard.com
> >>>>>>>
>
>>>>************************************************************************
*
> >>>>
> >*
> >
> >>>*
> >>>
> >>>>>**
> >>>>>
> >>>>>>>Classifieds! Buy or Sell!
> >>>>>>>http://sell.tech-assist.org
> >>>>>>>The Tech Address Book:
> >>>>>>>http://www.tech-assist.org/secure/tip/contact.htm
> >>>>>>>Add a Repair Tip Here, or Change/Remove your Email Address:
> >>>>>>>http://www.tech-assist.org/secure/tip/main.htm
> >>>>>>>Lost Password:
> >>>>>>>http://www.tech-assist.org and select "Lost your Login Info?".
> >>>>>>>Email Archives:
> >>>>>>>//www.freelists.org/archives/techassist/
> >>>>>>>
> >>>>>>>
>
>>>*************************************************************************
*
> >>>
> >*
> >
> >>>*
> >>>
> >>>>>*
> >>>>>
> >>>>>>Classifieds! Buy or Sell!
> >>>>>>http://sell.tech-assist.org
> >>>>>>The Tech Address Book:
> >>>>>>http://www.tech-assist.org/secure/tip/contact.htm
> >>>>>>Add a Repair Tip Here, or Change/Remove your Email Address:
> >>>>>>http://www.tech-assist.org/secure/tip/main.htm
> >>>>>>Lost Password:
> >>>>>>http://www.tech-assist.org and select "Lost your Login Info?".
> >>>>>>Email Archives:
> >>>>>>//www.freelists.org/archives/techassist/
> >>>>>>
> >>>>>>
>
>>>*************************************************************************
*
> >>>
> >*
> >
> >>>**
> >>>
> >>>>>Classifieds! Buy or Sell!
> >>>>>http://sell.tech-assist.org
> >>>>>The Tech Address Book:
> >>>>>http://www.tech-assist.org/secure/tip/contact.htm
> >>>>>Add a Repair Tip Here, or Change/Remove your Email Address:
> >>>>>http://www.tech-assist.org/secure/tip/main.htm
> >>>>>Lost Password:
> >>>>>http://www.tech-assist.org and select "Lost your Login Info?".
> >>>>>Email Archives:
> >>>>>//www.freelists.org/archives/techassist/
> >>>>>
> >>>>>
> >>>>
>
>>**************************************************************************
*
> >>
> >*
> >
> >>>*
> >>>
> >>>>Classifieds! Buy or Sell!
> >>>>http://sell.tech-assist.org
> >>>>The Tech Address Book:
> >>>>http://www.tech-assist.org/secure/tip/contact.htm
> >>>>Add a Repair Tip Here, or Change/Remove your Email Address:
> >>>>http://www.tech-assist.org/secure/tip/main.htm
> >>>>Lost Password:
> >>>>http://www.tech-assist.org and select "Lost your Login Info?".
> >>>>Email Archives:
> >>>>//www.freelists.org/archives/techassist/
> >>>>
>
>>**************************************************************************
*
> >>
> >**
> >
> >>>Classifieds! Buy or Sell!
> >>>http://sell.tech-assist.org
> >>>The Tech Address Book:
> >>>http://www.tech-assist.org/secure/tip/contact.htm
> >>>Add a Repair Tip Here, or Change/Remove your Email Address:
> >>>http://www.tech-assist.org/secure/tip/main.htm
> >>>Lost Password:
> >>>http://www.tech-assist.org and select "Lost your Login Info?".
> >>>Email Archives:
> >>>//www.freelists.org/archives/techassist/
> >>>
> >>>
> >>
> >>
>
>***************************************************************************
*
> >*
> >
> >>Classifieds! Buy or Sell!
> >>http://sell.tech-assist.org
> >>The Tech Address Book:
> >>http://www.tech-assist.org/secure/tip/contact.htm
> >>Add a Repair Tip Here, or Change/Remove your Email Address:
> >>http://www.tech-assist.org/secure/tip/main.htm
> >>Lost Password:
> >>http://www.tech-assist.org and select "Lost your Login Info?".
> >>Email Archives:
> >>//www.freelists.org/archives/techassist/
> >>
> >
>
>***************************************************************************
**
> >Classifieds! Buy or Sell!
> >http://sell.tech-assist.org
> >The Tech Address Book:
> >http://www.tech-assist.org/secure/tip/contact.htm
> >Add a Repair Tip Here, or Change/Remove your Email Address:
> >http://www.tech-assist.org/secure/tip/main.htm
> >Lost Password:
> >http://www.tech-assist.org and select "Lost your Login Info?".
> >Email Archives:
> >//www.freelists.org/archives/techassist/
> >
> >
>
>
>
****************************************************************************
*
> Classifieds! Buy or Sell!
> http://sell.tech-assist.org
> The Tech Address Book:
> http://www.tech-assist.org/secure/tip/contact.htm
> Add a Repair Tip Here, or Change/Remove your Email Address:
> http://www.tech-assist.org/secure/tip/main.htm
> Lost Password:
> http://www.tech-assist.org and select "Lost your Login Info?".
> Email Archives:
> //www.freelists.org/archives/techassist/
>
*****************************************************************************
Classifieds! Buy or Sell!
http://sell.tech-assist.org
The Tech Address Book:
http://www.tech-assist.org/secure/tip/contact.htm
Add a Repair Tip Here, or Change/Remove your Email Address:
http://www.tech-assist.org/secure/tip/main.htm
Lost Password:
http://www.tech-assist.org and select "Lost your Login Info?".
Email Archives:
//www.freelists.org/archives/techassist/
Other related posts:
