Question about JVC AV-48WP30 48" Rear Projection Television
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Posted on Jan 02, 2017
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
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.
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 :
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)
Non-functional Digital Input
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
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
Posted on Dec 06, 2007
You will have to do some dissassembling of the cabinet to remove the screen and bezel assembly. If you are will to do this I can give you the directions.
Posted on May 11, 2008
Does it use a cable box or are you using the tuner in the TV?
If you're using the tuner in the TV, try unplugging it for 5 minutes and then plug it back in, do a new channel scan and see if the CC goes away. If not, contact JVC to find out how to reset it. If it still does not work, you might need to have your main board replaced.
If you're using an external tuner plugged into a video input port (such as a cable box or satellite box) then the external box is at fault since TVs don't have CC available through their composite or component or svideo or hdmi ports.
Posted on Jun 19, 2009
yes, I know what is wrong and there is a simple way for you to confirm this.
Have you ever seen a TV with just a white line across the screen from left to right? On a regular TV if this happens and you leave it on long enough it will burn the mark into the screen.
I suspect what you have is two of the picture tubes in this projection TV have a burn--it is caused because the set lost either horizontal or vertical sweep--picture either closed from left/right or top to bottom for a moment and then came back on instantly---burns a mark in one or more of the 3 tubes screens.
Way to confirm is simple--with the back cover removed cover each lens one at a time with the set turned on--be very careful when you do this not to touch anything else---
if you cover a lens and one of the marks goes away that tube is burnt----my guess is you are going to find at least 2 of the 3 tubes are burnt on the screen---
Problem here is the tube or tubes need to be replaced to correct this AND whatever caused this HAS TO BE FOUND ALSO OR IT WILL DO THE SAME THING TO THE NEW TUBES--
CONSIDERING the cost of two or more replacement tubes you are most likely better to buy a new TV---I have seen about 100 sets with just exactly what your are describing---It does not happen a lot--but once it happens the damage is permanent.
I know I am not giving you good news but I am sure from your description this is what has happened.
Sorry to give you bad news---see for yourself if you cover each lens one at a time--if you do this and the marks are gone you know exactly what has happened.
IF YOU HAVE ANY QUESTIONS OR NEED MORE INFORMATION--let me know here--I am here to help but cannot always give good news.
Posted on Oct 07, 2009
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