[TechAssist] Re: RCA Proj. P52937SG. PTK195M. Pix bowed in - top& bot. Q19701 shorted
- From: Wayne Vanaman <Wayne@xxxxxxxxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Fri, 10 Jun 2005 16:01:20 -0500
David:
This is a good power supply to learn. Typical RCA, this circuit with
some variations is used in many sets.
The key is, replace all of the transistors, the base and emitter
resistors on the power transistor, the opto ic, and the reference ic.
In your case:
Q19701 246967 $1.15
Q19702 147665 $3.20
Q19703 232218 $.49
Q19704 229220 $2.05
U19700 223653 $.78
U19701 231525 $2.55
R19703 241313 1/2w 15 ohms $2.00
R19706 250661 2w 1.2 ohms $2.00
Q19705 215496 smd, buffer from the secondary into the optoiso. 98cents
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
Robinson Electronics wrote:
> 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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