Question about JVC AV-48WP30 48" Rear Projection Television

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48 jvc ok fellas I replace all the reisitor that where bad I plug all the wires to the convergence board, I plug in the tv and hear like thumping noise off on off on, but when I unplug the convergence board and plug in the tv set again the tv comes on fine exept the 3d problem occurs, what can be causing this problem model 48wp74 convergence board ssb-5051a-m2

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  • serge1er2003 Feb 01, 2009

    thanks tech yes change the stk chips upgraded to stk392-120

  • serge1er2003 Mar 18, 2009

    yes I did but forget it I messed up the convergence board some of the traces came off

  • David Makowski
    David Makowski May 11, 2010

    You said you changed all the burnt resistors but did you also change the 2 convergence IC's?

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  • JVC Master
  • 3,459 Answers

Projection TV sets have several common problems listed below.

Problem #1) Convergence

Symptoms:

  • Screen Looks 3-D
  • Colors wont align
  • Screen may look distorted
  • No Audio/Video - makes a chirping sound.
Example Photo:
48 jvc - 5f6e85c.jpg
Problem #2 CRT Fluid has clouded over.

Symptoms


  • Dull Video, Washed out
  • White/Bright looking video
  • Halos around objects
  • Red/Orange looking
Example Photo:


You can see more examples and find a fix here...

bb0cf99.pnghttp://www.fixya.com/support/r2861467-solution_video_looking_whiteish_dull

Posted on Mar 25, 2010

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2 Answers

My jvc rear projection 48" tv is showing double images, what can I do to fix this problem


In the menu do the auto convergence. If still bad replace the convergence ics. Also check resistors around the ics. You can remove the front grill and access the conv board from the front. Small board on the right. It popps out.

Mar 25, 2010 | JVC AV-48WP74 48" Rear Projection...

1 Answer

HI, my JVC AV-48wp30 has the same symptoms as other posts here. Powers on with no screen, HV, and no CRT heater coils light up. Thumping sound in speakers, and then shuts off. Blue light flashes. ...


take off the front panel and unplug the convergance board up front just behinf panel if the set now comes on replace your con amps if not you have a power supply issue more than likly the con amps are bad

Nov 20, 2009 | JVC AV-48WP30 48" Rear Projection...

1 Answer

No picture when you plug tv in but the power comes on and then you hear a low thump thump thump


disconnect power to the convergence module if thump go away replace convergence ic's.

Nov 03, 2009 | JVC AV-48WP30 48" Rear Projection...

1 Answer

Blue light flashing - no picture speakers thump


Do not remove the rear panel with the power cord still plugged in on your model or you will instantly wipe out the digital circuits. Its a safety feature. remove the front speaker grille screws are on the side and inside the door under power button. Then after you remove the speaker grille remove the small access panel and you will see the convergence board on the right side thre are 3 wire plugs on the right side of the convergence board. Un plug thos 3 wire plugs and try to power up the set if it powers up the problem is convergence. If it doesnt its the deflection. If you need the deflection board go to the following link they have one.
http://servicemanuals.vstore.ca/

Jun 16, 2008 | JVC AV-48WP30 48" Rear Projection...

1 Answer

Convergence board


do not remove the back panel to that model with the power cord still plugged in cause if you do the digital section of the TV will be completely wiped out. The convergence board is in the front behind the speaker grille and small access panel its the first board after the access panel its on the right side rectangle board. You can get a convergence board at the following link just leave an email with your model number and what your needing. I work there as a support tech and they just got those boards in yesterday and havent even listed them yet. Heres the link.
http://servicemanuals.vstore.ca/

May 21, 2008 | JVC AV-48WP74 48" Rear Projection...

1 Answer

Your fixya solution


i know it for a fact, these boards are horrible. you could do the job urself or contact www.ptscorp.com you can have it rebuilt there for about $110 shipping and all. i hope this helps.

Apr 21, 2008 | JVC AV-48WP74 48" Rear Projection...

1 Answer

Won't power up and power button light flashes


when you replaced the convergence amps did you check and replace the resistors? it seems like they always take out two or more resistors. the problem is on the convergence board, i have the same tv that did the same thing. if the speakers are still thumping, you may have got a dud amp. i recommend using the factory stk392-110 amps. make sure all of your solder connections are good and none of them are touching. also, when you get the set back on you will need to manually adjust the convergence from the menu. you will need the factory remote. if you find bad resistors, the values are on them, but if you need the values and wattage, then use this page:

http://home.comcast.net/~dande76530/ConvergenceOutSchematiics.pdf

hope this helps you.

Apr 06, 2008 | JVC AV-48WP74 48" Rear Projection...

1 Answer

JVC AV-48WP30 will not give a picture


Replace the convergence IC`s again using original Sanyo chips (STK 392-110 or STK 392-180). Make sure to use plenty of heat sink compound. Coat the entire back side of the chips. Also look to see if any of the low ohm resistors are burned. A shorted chip will cause the thumping sound and the set will shutdown. I am guessing that you used generic IC`s as a replacement. They are cheap and the leggs fall off when you apply too much heat during soldering. Dont wory about the CRT driver or the deflection board, they are probably fine.

Dec 12, 2007 | JVC AV-48WP30 48" Rear Projection...

2 Answers

JVC AV-48WP30 48 in. Rear Projection


this is the raw research for this that I have found. It seems like the most likely culprit for this is the stk chips on the convergence board (JVC didn't put nearly enough heat sink compound on should be a small layer all the way across they put on a couple dabs) I hear tale you can check this out by disconnecting the convergence board and turning on the set . only go after the convergence board from the front (behind the speaker grill is another panel, the convergence card is right behind there) there is a sneak circuit which will kick in possibly destroying at least the dvi input and mabie more if the set is powered on with the back removed and you didn't put a jumper in the right place or cover over a hole in the back of the dvi module (supposidly to keep people from hacking movies, like there arn't easier ways to do that if you really wanted to). if that doesnt fix it then I have found several other possibilities but I am now a few hundred miles from the tv that I was working on so havent had a chance to try this out:
No. The CRT driver ICs are prone to shorting and cause this symptom (I just had one with those very symptoms and the green CRT driver IC was shorted). Disconnecting the CRT board does not clear the short on the board. Often then is a small burn mark on the CRT board under the affected IC (but not always). The IC should be a TDA6111Q. Be sure to note the proper position
of the IC as it should face with the letters TOWARD the heat sink!!!!

Larry, Check the CRT driver ICs on each of the CRT boards.
Bob Waterman, CET® #RI-28
Master Technician License #9109
Service Manager / Parts Manager
Gemini Computer, TV, & Security Alarms
(508)695-7302
(508)695-7769 FAX
geminitv@xxxxxxxxxxx
Hi Guys, I don`t see many JVC`s and don`t have the print for this AV48WP30, went out this morning and as customer claimed on phone when you plug set in and turn on it makes a loud thump thump in both speakers 20-30 times then relay clicks, the thump stops, and blue idiot light on front goes dim/bright, dim/bright, have to unplug set to start this same scenario over again. Never develops HV or audio, Will order the service manual today, but would like to know if anyone has seen this before (should say "heard" this before)
I would disconnect each crt board and hv lead one at a time and try. Have seen several bad tubes on that model. The only other problem I have seen on that set is bad convergence amps, however that doesn't cause shutdown.
Perry Bower
Electric Medic
From Tech Repair CD:
JVC\AV48WP74\just went click*click*click when turned on Video drive IC (IC1101) on the red CRT module
shorted. It looked like bad solder on the B+ was the cause

Frequently Used Top Five Repair Parts by symptom code
MODEL NUMBER : AV48WP30 - TV
SYMPTOM CODE : DEAD
TOP FIVE PARTS :
2SC5552-RL
2SC5904-RL
QQH0113-002
STR-F6629B/F7
STK392-110
Above from JVC Web site, also I have seen shorted video drive IC's on the crt boards short and cause this symptom. Try unplugging the 200 volt source to the crt boards and see it the set powers up and stays on. There is a B+ relay which supplies 130 Volts to the horizontal output circuit. Is this relay energizing? I takes about five seconds after the power is turned on for it to energize. If a short is detected on the 130 volt line the blue power lamp on the front will do what you describe and the relay will pulse on and off. (David)

Symptom:
Non-functional Digital Input
Solution:
1. Power off the unit
2. Disconnect the digital input if it is connected
3. Remove the rear cover
4. On the digital input module, using a shorting pin (PC type) or a
jumper, short Pin 1 and Pin 2 of the
SB connector
5. Power on the unit
6. Unplug the unit and remove the shorting pin or the jumper
7. Re-attach the unit’s rear cover
8. Power on the unit, and input the digital source

Oct 05, 2007 | JVC AV-48WP30 48" Rear Projection...

3 Answers

JVC MODEL # AV-48WP74 48 IN. BIGSCREEN TV.


I had a problem with my TV colors not lining up. One day I turned it on and the green was out of wack. I checked this message board and replaced the STK chips, bad soldering and all led to me just giving up on that and buying a whole new Convergence Board ($185). I just plugged this in and though now my Green lines up okay, my red is out of whack. Is there something I am doing wrong? Can anyone help me? Did i miss a step? Frustrated......Bruce

Jul 29, 2007 | JVC AV-48WP74 48" Rear Projection...

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