Question about JVC AV-48WP74 48" Rear Projection HDTV-Ready Television

1 Answer

Convergence board my tv has gone black but the blue light in the front is on. a thumping noise from the speakers can be heard. from what i have read online it appears that it is probably the convergance board. how do I locate this board so that i can replace it. i have already removed the rear cover but can not identify the convergence board. please help

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  • kcagle May 21, 2008

    i located the board, removed the board. underneath the board on oneside it appears to be a little bit brownish underneath one of the ic's. I think I will have the ic's replaced and see what happens. i will let you know what happens

  • tootye Aug 17, 2008

    Please help find the manual for this JVC LCD HDTV watching t.v. screen went black then started to make clicking sound and the bass speaker or some thing got loud and after 1 or 2 min the blue power button just flashes. No sound/picture.....remote does nothing.

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  • JVC Master
  • 8,617 Answers

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/

Posted on May 21, 2008

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Jvc 56 inch television went black, then a large thumping noise, and I tried shutting off the power and could not, so I had to unplug the television; the television now will not come on.


sounds like the WP30 or WP74 series that has a convergence shutdown which will usually cause the thumping through the speakers. Unplug the convergence power board and see if the set will power up. Do not remove the rear cover the board is up front behind the speaker grille. Never remove the rear cover on a JVC rear projection as it can damage the digital circuits due to the safety interlock on various JVC models.

Nov 17, 2011 | JVC Projection Televisions

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

Jvc tv 56 convergence problem


on the 48WP30, you get to the convergence board through the front. Around the back edge of the speaker grille are four screws. You remove these screws. Then you remove the two other screws at the top of the speaker grille near the center panel underneath the front av input door.


7000c81.jpg

THen after you get the speaker grille off, you take the four screws out of the wood panel door and take it off:

d237c04.jpg

Those two big black heat sinks on the front there are your SK chips...on the convergence board of course. pop it up from those four tabs, and that will let you carefully move the convergence board so that you can reach in better, and unhook the three plugs on the right side (looking at it from the heat-sink side) behind the heatsinks (one for red, green, and blue each) and then on the other side of the board, you disconnect the other two plugs, but there's one that you actually have to trace back into the inside of the TV and unplug from a vertical standing board, since the socket is not on the convergence board itself. let me draw up a little graphic real quick.

ef28a70.jpg

Hope that helps.

Oct 23, 2008 | 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

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

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...

1 Answer

No responce except thumping noise


PLEASE TRY TO CHANGE AGAIN THE CONVERGANCE IC'S

Oct 02, 2007 | JVC AV-48WP30 48" Rear Projection...

2 Answers

Popping noises and no picture or sound


try replacing the stk's on the deflection board (making sure that all of the resistors on the board are OK and that there are no solder cracks I found one of the jumpers had a bad solder joint on the one I worked on) but if that doesn't fix I have some raw research that might give you somewhere to start :
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

Jan 16, 2007 | JVC AV-48WP74 48" Rear Projection...

1 Answer

JVC AV-56WP30 Two Years Old. Up And Croaked


Hi What you are discribing is a condition call power supply overcurrent shutdown the TV is going into a protection mode to prevent further circuit damage you really to call in a tech with JVC projection TV repair skills to fix this problem for you good luck windman

Oct 25, 2005 | JVC AV-56WP30 56" Rear Projection...

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