[TechAssist] Re: PTK195 Convergence power supplies, switch modes in general
- From: "LeRoy Westlund" <llw@xxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Wed, 9 Nov 2005 22:35:50 -0700
Thanks Wayne.
That's one hell of a lot of GOOD info.
Thanks for sharing it with us.
LLW
LeRoy Westlund
Westlund TV & Electronics
97 North Main " Some days are Diamonds..
Centerfield, UT 84622-0087 Some days are " COAL".
Ph./Fax 435-528-3822
mailto:LLW@xxxxxxxxxx
-----Original Message-----
From: Wayne Vanaman <Wayne@xxxxxxxxxxxxxxxxxxxxx>
To: techassist@xxxxxxxxxxxxx <techassist@xxxxxxxxxxxxx>
Date: Wednesday, November 09, 2005 2:26 PM
Subject: [TechAssist] PTK195 Convergence power supplies, switch modes in
general
>Repairing PTK195 convergence power supply boards that use discreet
>semiconductors, pn 250686.
>
>This basic power supply, with variations, is used in many of the RCA
>chassis, not just this aux power supply board. Even though the discreet
>component version of this board has only one part number of which I am
>aware, there are multiple version of that part number, some have more or
> fewer active semiconductors. There are versions with and without
>input chokes.
>
>There are two things you can do:
>1. Troubleshoot to exact parts.
>2. Shotgun.
>
>The way I do it is to replace all active (transistors and ICs)
>components and high failure components in the primary.
>Replace the opto that connects the primary and secondary.
>Replace the active component(s) in the secondary closest to the opto,
>input and output.
>Check all pumpup capacitors.
>Check diodes.
>
>You need to determine if any of the active components are damaged. If
>any active components are damaged, replace ALL of them as a set.
>Second, determine if there are bad passives-capacitors, resistors, and
>diodes.
>
>If the main power switch transistor is shorted the resistors around it
>are suspect. On a power source transistor, such as Q19701 or a
>horizontal output transistor which has an emitter or source resistor,
>replace that resistor.
>
>Specifically, on this power supply:
>
>Q19701 246967
>Q19702 147665
>Q19703 232218
>Q19704 229220
>U19701 223653
>U19700 231525
>Q19705 215496
>Q19710 216434 (if installed)
>R19703 (if damaged)
>R19706 250661
>
>In the case of this particular power supply that is working, but
>producing low voltage the feedback path may be the only damage. In this
>specific case:
>CR19715 feeding the base of Q19711, and CR19706.
>
>Parts list:
>
>STOCK #,
>DESCRIPTION,
>DRAWING #,
>SAFETY CRITICAL
>
>CIRCUIT 250686 CIRCUIT, POWER SUPPLY 15642410 Y
>C19700 227069 CAPCD 680PF J SL 2KV 1506510000 Y
>C19701 176665 CAP LYTC 220UF M 200V 1517092000 N
>C19702 214747 CAP POLY .033UF J 400V 4043458000 Y
>C19703 214066 CAP POLY 1500PF K 100V 3093557000 N
>C19704 248625 CAP POLY .39UF K 63V 9056827000 N
>C19705 214015 CAP POLY 1UF J 63V 9056828000 N
>C19706 239176 CAPCC 820PF J NPO 50V 1507089000 N
>C19708 146179 CAPCD 470PF K Z5P 250V 3093737000 N
>C19709 162787 CAP LYTC 22UF M 50V 7042797000 N
>C19710 239130 CAP LYTC 680UF M 63V 7043466000 N
>C19711 246952 CAP LYTC 680UF M 35V 1541310000 N
>C19712 246952 CAP LYTC 680UF M 35V 1541310000 N
>C19713 239130 CAP LYTC 680UF M 63V 7043466000 N
>C19714 146179 CAPCD 470PF K Z5P 250V 3093737000 N
>C19715 146179 CAPCD 470PF K Z5P 250V 3093737000 N
>C19716 146179 CAPCD 470PF K Z5P 250V 3093737000 N
>C19717 146179 CAPCD 470PF K Z5P 250V 3093737000 N
>C19718 224271 CAP POLY .22UF K 63V 7042765000 N
>C19719 220998 CAP LYTC 1UF M 100V 1106709000 N
>C19720 156239 CAP LYTC 10UF M 63V 30935880 N
>C19721 190538 CAPCD 680PF M Z5P 1KV 11057250 Y
>C19722 190538 CAPCD 680PF M Z5P 1KV 11057250 Y
>C19723 190538 CAPCD 680PF M Z5P 1KV 11057250 Y
>C19724 190538 CAPCD 680PF M Z5P 1KV 11057250 Y
>C19725 102230 CAPCD 470PF K Z5P 500V 1529623000 N
>C19726 225541 CAPCC 220PF J NPO 50V 3093873000 N
>CLIP 181032 CLIP, TRANSISTOR 15089440 N
>CR19701 198589 DIODE 70436540 N
>CR19702 234048 DIODE 1504770000 N
>CR19703 232545 DIODE ZENER 8.2V .5W 1107366000 N
>CR19704 198589 DIODE 70436540 N
>CR19706 235831 DIODE ZENER 12V .5W 3094868000 N
>CR19710 234048 DIODE 1506410000 N
>CR19711 220465 DIODE 1504123000 N
>CR19712 220465 DIODE 1504123000 N
>CR19713 234048 DIODE 1506410000 N
>CR19714 226456 DIODE ZENER 10V .5W 9057802000 N
>CR19715 239133 DIODE, ZENER 20V .5W 3094881000 N
>CR19717 147015 DIODE 1107079000 N
>CR19718 147015 DIODE 1107079000 N
>CR19719 147015 DIODE 1107079000 N
>CR19720 147015 DIODE 1107079000 N
>CR19721 140971 DIODE 7043653000 N
>FB19700 237504 BEAD 1509165000 N
>FB19701 237504 BEAD 1509165000 N
>FB19702 237504 BEAD 1509165000 N
>FB19703 237504 BEAD 1509165000 N
>FB19704 237504 BEAD 1509165000 N
>FB19705 237504 BEAD 1509165000 N
>FB19707 237504 BEAD 1509165000 N
>FB19708 237504 BEAD 1509165000 N
>FB19709 161237 BEAD 6045260000 N
>HEATSINK 240243 HEATSINK 15171310 N
>INSULATO 214613 INSULATOR 15088690 N
>J19701 239135 CONNECTOR 6 PIN 15175020 Y
>JC19700 181161 RES CMF 1/8W 0% 0R 5088553000 N
>JW19700 NONSTK WIRE JUMPER 1508850000 N
>JW19701 NONSTK WIRE JUMPER 1508850000 N
>JW19702 NONSTK WIRE JUMPER 1508850000 N
>JW19703 NONSTK WIRE JUMPER 1508850000 N
>JW19704 NONSTK WIRE JUMPER 1508850000 N
>L19701 215504 COIL, 22UH 1003807000 N
>L19702 215504 COIL, 22UH 1003807000 N
>L19703 215504 COIL, 22UH 1003807000 N
>L19704 215504 COIL, 22UH 1003807000 N
>Q19701 201152 TRANSISTOR 1090550000 N
>Q19702 147665 TRANSISTOR 5088878000 Y
>Q19703 232218 TRANSISTOR 1511135000 N
>Q19704 229220 TRANSISTOR 1506430000 N
>Q19705 215496 TRANSISTOR 30946660 N
>Q19706 215496 TRANSISTOR 30946660 N
>Q19707 215495 TRANSISTOR 11070770 N
>Q19708 215496 TRANSISTOR 30946660 N
>Q19709 215496 TRANSISTOR 30946660 N
>Q19710 215495 TRANSISTOR 11070770 N
>Q19711 215495 TRANSISTOR 11070770 N
>R19701 248628 RES CFFP 1/4W 5% 390K 1106537000 N
>R19702 242626 RES CFFP 1/2W 5% 100R 9057401000 Y
>R19703 241313 RES CFFP 1/2W 5% 15R 3094368000 Y
>R19704 241919 RES CFFP 1/2W 2% 150R 8044008000 Y
>R19705 243994 RES CF 1/2W 5% 1K 1106580000 Y
>R19706 250661 RES WW 2W 5% 1.2 OHM 2047059000 Y
>R19707 248629 RES MFFP 1W 5% 56K 3094086000 N
>R19708 248630 RES CF 1/2W 5% 200K 3093985000 N
>R19709 175045 RES CF 1/4W 5% 330R 6044155000 N
>R19711 248631 RES MF 1/4W 1% 243R 7043115000 N
>R19712 248633 RES MF 1/4W 1% 348R 1106073000 N
>R19713 248634 RES CFFP 1/4W 5% 20R 7043336000 N
>R19714 174366 RES CMF 1/8W 5% 18K 8043968000 N
>R19715 175317 RES CF 1/4W 5% 10K 3093948000 N
>R19716 175308 RES CF 1/4W 5% 1.2K 8043700000 N
>R19717 190462 RES CMF 1/8W 2% 1K 4043760000 N
>R19718 206261 RES CMF 1/8W 5% 10K 6044371000 N
>R19719 206261 RES CMF 1/8W 5% 10K 6044371000 N
>R19720 190462 RES CMF 1/8W 2% 1K 4043760000 N
>R19721 174361 RES CMF 1/8W 5% 1M 4043757000 N
>R19722 175039 RES CF 1/4W 5% 68R 5088294000 N
>R19725 190462 RES CMF 1/8W 2% 1K 4043760000 N
>R19726 181062 RES CMF 1/8W 5% 51K 1106482000 N
>R19727 151602 RES CMF 1/8W 5% 240R 6044370000 N
>R19728 215206 RES MF 2W 5% 30K 5088416000 N
>R19729 200494 RES CMF 1/8W 5% 47K 9057361000 N
>R19732 248634 RES CFFP 1/4W 5% 20R 7043336000 Y
>R19733 190462 RES CMF 1/8W 2% 1K 4043760000 N
>T19700 190507 TRANSFORMER 2048044000 Y
>T19701 250662 TRANSFORMER 15645040 Y
>U19700 223653 INTEGRATED CKT 1504569A00 Y
>U19701 231525 IC, REFERENCE 1506901000 N
>
>
>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
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