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
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?
On the JVC Check these :
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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 .
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On the Sony ......did you resolder the driver tranny? Also check for a short on the 200V supply for the CRT driver IC
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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:
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JVC AV32720
Dead, No Relay Click
Bay Electronics, Inc.
C926, 16v 1000ufd (High Esr)
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JVC AV32720
Dead. Relay Keeps Clicking, Power Light Keeps Flashing.
Robinson Electronics
Replaced "Shorted" Diode - D531 #Rh3g
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Yes on The Sony resolder hor drive trany and all areas around the flyback. Whilst in there resolder vertical IC..and Horiz drive transistor.
Thanks for all the input. I did all that on each unit, but no go. Thanks again. Dani. Anyone else got something I missed?
Dani wrote:
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