[TechAssist] Re: RCA Projection PTK169PTA U4101 problems (no standby voltages)
- From: Larry Eastman <videotech@xxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 03 Oct 2003 11:27:34 -0400
John, thanks for the reply, changed it, no difference, Larry R
Larry Eastman
American TV & Electronics
Crystal River, Fl. 34428
John @ Myers TV wrote:
>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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