Riddled TV Repair Forum

Steve · Guest

I have a JVC big screen, AV-48WP39
with convergence problems.
The picture is bowed in top, bottom left and right sides.
Replaced the STK ICs and an open resistor found on the convergence board.
Still, I have the same thing as before replacement of the parts.
I noticed that one of the ICs is still running very warm when I
reinstalled the convergence PCB.
Does anyone have a print and an idea of what is going on here?
I need a swift kick in the butt to get me in the right direction!
Thanks for you input.... I know some of you guys must have seen this
before as there were several tips on Repairworld in regards to
convergence problems.

Google

Guest · Posted: Wed Jul 25, 2007 10:56 am Post subject:

B+ and B- ???
Peggs

Dennis · Guest

I HAD A SIMILAR PROBLEM ON A JVC set

measure all the resistors on the board mine had a couple out of
tolerence -- mainly low OHM resistors.
Dennis

David · Guest

Steve , also found this on that set .

>If You Remove The Rear Cover While The Power Is On You Will Destroy All Dvi
>Programing Inside The Dvi Digital Input Module. The Only Way To Restore
>The Programming Is To Send The Unit To Jvc. There Is A Light Sensor
>Inside The Tv And When The Back Is Removed With The Power On The Data Is
>Erased From The Eprom. First Turn Off Set And Remove Power Cord Then Short
>Pins 1 And 2 On The Sb Connector Of Digital Input Module. Before The Real
>Panel Is Insterted Into The Cabinet Remove The Short On The Sb Connector.
>Do Not Turn Power On Until The Rear Panel Is Inserted Into The Cabinet. If
>You Have To Work Inside The Set With Power On Remove The Two Cables Going
>To The Dvi Module.

but I have to say that I've done it be fore I
read this and had no problem. Good Luck Home Boy

Guest · Posted: Wed Jul 25, 2007 10:57 am Post subject:

I had the same thing not too long ago. Turned out to be the digital
convergence module. Tim

Tim

Google

David · Guest

Steve , found these tips:Pasted from WinSTips:

1.C931 (Lead May Be Broken)

2.Found A Burnt R842 2.2 At 2watt Resistor, And Ic 804 Bad Stk392-110

3.Ic804 Stk392-110 Bad Also 1.5 Ohm Resistor Bad R846
>
>
David

Steve · Guest

Well, I thought I'd take a minute to thank all that sent me info, tips
and literature for this set!
The set is fixed.
Thanks to Peggs for sort of getting me in the right direction.
She asked about the B+ and B- supplies. We'll I didn't have the set
here, just the convergence board with the STK ICs.
I'd replaced both ICs and an open supply resistor, had made a earlier
trip to reinstall the board, only to have the same results.
Well, to make a long story short, due to Peggs email, I for some reason
checked the traces from the connectors to the STK IC's and found 2
broken traces that we just dang near invisible! Patched the copper, and
today went and reinstalled the board and BINGO! BIG SMILEY FACE!
I can say that there is a possibility that I was the one that cracked
the PCB as the STK ICs were almost welded to the heatsinks from the heat
they generate. Though I tried to be very careful, it could have happened.
But you know what? Because of the great folks here, you saved my butt
and I brought home the bacon!
Thank you to all that helped!
---
Steve

serge6969 · Joined: 20 Mar 2009 Posts: 1 Location: los angeles

question I have the same problem with a convergence board it came out from a 48 jvc rear projection part number ssb-5051a-m2 the problem is some of the traces where you weld/solder the stk to the board came off what do you guys use for this problem help!!! is very compact/difficult to use a jumper wires thanks :cry: also can you guys tell me what are these small chips do, from this board are c824 r838 c821 r835 r802 r858 there close together thanks kool forum

kuhurdler · Joined: 28 Dec 2006 Posts: 2580 Location: Overland Park, KS

Can you ask that again, in English please?

iguana · Joined: 30 Jan 2010 Posts: 2 Location: Columbus, Ohio

I have this TV and had the same problem but it went away and then came back. Wouldn't that indicate a problem with a soldering joint? I re-soldered each and every joint on both convergence IC's and the problem persists (severe red convergence in the upper left). It sometimes jumps around, in a flickery sense, when adjusting the convergence using the standard convergence menu option. Would this mean a possible capacitor problem in the sweep circuit? I don't want to replace both of the IC's only to find the problem persists.
Thanks for any help anyone can provide.

Regards,
Brian