[TechAssist] Re: RCA Proj. P52937SG. PTK195M. Pix bowed in - top& bot. Q19701 shorted
- From: "tvservice" <tvservice@xxxxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 10 Jun 2005 17:15:06 -0500
there has been history of these diodes ( CR19710 and CR19713 ) being
intermittently open, RCA service bulletin TV 02-002, and when they short the
power supply shutsdown or it blows the power supply
Being this unit lossed convergence operation and still played awhile makes
me think diode failure causing shutdown of power supply then failure of fet
circuit
Robert
tvservice@xxxxxxxxxxxxx
H & H Electronics Inc
----- Original Message -----
From: "Wayne Vanaman" <Wayne@xxxxxxxxxxxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Friday, June 10, 2005 4:04 PM
Subject: [TechAssist] Re: RCA Proj. P52937SG. PTK195M. Pix bowed in - top&
bot. Q19701 shorted
> Wow, you probably need some resistors, too. I have never replaced a
> diode, to the best of my memory.
>
> 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
>
>
> tvservice wrote:
> > board # 250686 @ $50 + $20 dud at Tritronics
> > Replace all these parts if you repair board
> > Q19701 246967 / P4NB50FP
> > Q19702 147665 / NTE159
> > Q19703 232218
> > Q19704 229220 / NTE123AP / 2N3904 / BC547
> > U19701 231525 / NTE999
> > CR19701 198589 / NTE519
> > R19703 241313 / 15 ohm 1/2 w
> > CR19710 234048 / MUR115 / NTE587
> > CR19713 234048 / MUR115 / NTE587
> > F14201 175425 / GMA 5 amp
> >
> > Robert
> > tvservice@xxxxxxxxxxxxx
> > H & H Electronics Inc
> >
> >
> > ----- Original Message -----
> > From: "Robinson Electronics" <RobinsonElectronics@xxxxxxxxxxx>
> > To: <techassist@xxxxxxxxxxxxx>
> > Sent: Friday, June 10, 2005 3:34 PM
> > Subject: [TechAssist] RCA Proj. P52937SG. PTK195M. Pix bowed in - top&
bot.
> > Q19701 shorted
> >
> >
> >
> >>Can anyone help with some info on these conv. pwr boards?
> >>Customer said the pix bowed in from top and bottom, stayed like that for
a
> >
> > bit, then popped and quit working.
> >
> >>I found the FET Q19701 on the conv. pwr board (cracked and burnt).
> >>Are these usually cost effective to repair, or just replace the whole
> >
> > board?
> >
> >>This one uses a fet "burnt / cracked" cannot read value?
> >>The one I was familiar with uses a stk reg. instead.
> >>Don't know what the difference between them are, except the reg. used?
> >>Can anyone help with some info. about these, or common components to
> >
> > replace, or better to replace board?
> >
> >>Not sure how many other components are damaged yet?
> >>Still checking,
> >>
> >>Thanks for any help. David.
> >>
> >>Robinson Electronics
> >>1075 Sweeten Creek Road
> >>Asheville, NC 28803
> >>Ph./Fax. 828 274-3787
> >>Toll Free. 1-888 ROBELECT
> >>www.robinsonelectronics.com
> >>www.robelect.com
> >>Mailto: RobinsonElectronics@xxxxxxxxxxx
> >>
>
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