[TechAssist] Re: RCA Projection PTK169PTA U4101 problems (no standby voltages)
- From: "John @ Myers TV" <myerstv@xxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 3 Oct 2003 07:31:01 -0400
My guess would be CR4101. I just had a similar problem. CR4101 checked ok,
but failed under load.
John Myers
Myers TV Service Co. Since 1984
Alliance, OH
Voice: 330-821-6545
myerstv@xxxxxxxx
http://members.ebay.com/aboutme/tvguy07/
http://members.ebay.com/aboutme/threads_r_us/
----- Original Message -----
From: "Larry Eastman" <videotech@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: October 02, 2003 10:13 AM
Subject: [TechAssist] Re: RCA Projection PTK169PTA U4101 problems (no
standby voltages)
> Wayne, thanks for the reply, all parts you listed check good, Larry E
> Larry Eastman
> American TV & Electronics
> Crystal River, Fl. 34428
>
> Wayne Vanaman wrote:
>
> >R4003 is 33K
> >from u4101p16, smd r4150 22 ohms, c4118 470uf, r4126 6.8 ohms u4101p15
> >
> >First guess is c4118, next r4003.
> >
> >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
> >
> >
> >----- Original Message -----
> >From: "Larry Eastman" <videotech@xxxxxxxxxxxx>
> >To: "techassist" <techassist@xxxxxxxxxxxxx>
> >Sent: Wednesday, October 01, 2003 4:05 PM
> >Subject: [TechAssist] RCA Projection PTK169PTA U4101 problems (no standby
> >voltages)
> >
> >
> >>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
> >>
> >>
>
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