Couple of dogs!
 

JVC AV-32FA44: Goes dead, just as you get a perfect picture. Talked to
JVC Tech, he said it's the over voltage feedback loop, but I can't find
anything bad after doing the following repair.
If I bypass the standby relay, the unit works fine but of course, no
front panel function. Ideas?


D 432 SHORTED,Q431 OPEN,C973 BLOWN APART,THESE ARE PART OF OCP SHUTDOWN
CIRCUIT,HAD 4.04 VOLTS ON OCP LINE, SHOULD BE LOW,PUMP UP OUT OF
VERTICAL IC PIN 7 SHOULD KEEP Q431 TURNED ON

Sony KV-32S40 dead, with MX0841B reg IC, 0.1 ohm fusible, 2SC5148
horizontal output bad, I didn't have a VDR 602, & it measured ok...open
circuit. Put it on the variac, slowly
ramping up the voltage, perfect pix, & sound....few seconds
later...gently blew all parts.
They idn't even get hot. Flyback bad? Didn't get time to scope the
horizontal waveform.
Did I miss something?

JVC AV-32720 shorted D 531, replace, blows right away. Can't get to
measure anything.
Ideas?

Couple of dogs!
 

On the JVC Check these :

---------------------------------------------------------------
Text pasted from WinSTIPS 2.0
http://www.ServiceSoftware.com
---------------------------------------------------------------

JVC AV32FA44

Shut Down / High Voltage No Go

Y.M. Electronique Enr.

Have 2 Caps Blew C973 (10uf 50v. ) And C432 (47uf 25v. ) And Bad Smd
Transistor Q431.Marked (8b) Located Backside Board.
The Cause Of Destruction Was "Lost Ground" In The P.S. Bad Solder On Jumper
W624 .

---------------------------------------------------------------

On the Sony ......did you resolder the driver tranny? Also check for a
short on the 200V supply for the CRT driver IC

---------------------------------------------------------------
Text pasted from WinSTIPS 2.0
http://www.ServiceSoftware.com
---------------------------------------------------------------

SONY KV32S40

Dead. No Power Up. Timer Light Flashing

Jeff Stielau :2/12/03 :Shoreline Electronics Repair

Horizontal Output Transistor Shorted 2sc5148 : Replace It
Caused By Cracked Solder Connections On Horizontal Drive Transform :
Resolder It.
On Power Supply Board , Mx0841 Dual Transistor Pack Shorted : Replace It
0.1 Ohm Fusible Resistor Open On Power Supply Baord : Replace It

---------------------------------------------------------------


On the JVC....are you using the correct replacement? Also change the cap
listed:

---------------------------------------------------------------
Text pasted from WinSTIPS 2.0
http://www.ServiceSoftware.com
---------------------------------------------------------------

JVC AV32720

Dead, No Relay Click

Bay Electronics, Inc.

C926, 16v 1000ufd (High Esr)

---------------------------------------------------------------

JVC AV32720

Dead. Relay Keeps Clicking, Power Light Keeps Flashing.

Robinson Electronics

Replaced "Shorted" Diode - D531 #Rh3g

---------------------------------------------------------------






--
==========================
Jeff Stielau
Shoreline Electronics Repair
344 East Main Street
Clinton,CT 06413
860-399-1861
860-664-3535 (fax)

========================

"Dani" wrote in message
oups.com...
JVC AV-32FA44: Goes dead, just as you get a perfect picture. Talked to
JVC Tech, he said it's the over voltage feedback loop, but I can't find
anything bad after doing the following repair.
If I bypass the standby relay, the unit works fine but of course, no
front panel function. Ideas?


D 432 SHORTED,Q431 OPEN,C973 BLOWN APART,THESE ARE PART OF OCP SHUTDOWN
CIRCUIT,HAD 4.04 VOLTS ON OCP LINE, SHOULD BE LOW,PUMP UP OUT OF
VERTICAL IC PIN 7 SHOULD KEEP Q431 TURNED ON

Sony KV-32S40 dead, with MX0841B reg IC, 0.1 ohm fusible, 2SC5148
horizontal output bad, I didn't have a VDR 602, & it measured ok...open
circuit. Put it on the variac, slowly
ramping up the voltage, perfect pix, & sound....few seconds
later...gently blew all parts.
They idn't even get hot. Flyback bad? Didn't get time to scope the
horizontal waveform.
Did I miss something?

JVC AV-32720 shorted D 531, replace, blows right away. Can't get to
measure anything.
Ideas?

Couple of dogs!
 

Yes on The Sony resolder hor drive trany and all areas around the flyback.
Whilst in there resolder vertical IC..and Horiz drive transistor.



"Dani" wrote in message
oups.com...
JVC AV-32FA44: Goes dead, just as you get a perfect picture. Talked to
JVC Tech, he said it's the over voltage feedback loop, but I can't find
anything bad after doing the following repair.
If I bypass the standby relay, the unit works fine but of course, no
front panel function. Ideas?


D 432 SHORTED,Q431 OPEN,C973 BLOWN APART,THESE ARE PART OF OCP SHUTDOWN
CIRCUIT,HAD 4.04 VOLTS ON OCP LINE, SHOULD BE LOW,PUMP UP OUT OF
VERTICAL IC PIN 7 SHOULD KEEP Q431 TURNED ON

Sony KV-32S40 dead, with MX0841B reg IC, 0.1 ohm fusible, 2SC5148
horizontal output bad, I didn't have a VDR 602, & it measured ok...open
circuit. Put it on the variac, slowly
ramping up the voltage, perfect pix, & sound....few seconds
later...gently blew all parts.
They idn't even get hot. Flyback bad? Didn't get time to scope the
horizontal waveform.
Did I miss something?

JVC AV-32720 shorted D 531, replace, blows right away. Can't get to
measure anything.
Ideas?