[TechAssist] Re: RCA Projection PTK169PTA U4101 problems (no standby voltages)
- From: "Wayne Vanaman" <Wayne@xxxxxxxxxxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 1 Oct 2003 16:08:57 -0500
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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