This morning was the first time that this problem came up, when the tv is turned on there is no picture and the speakers start thumping like a drum. then after a minute or so they stop and the blue light on the front panel starts blinking, i would say about once every 2 seconds. the tv will turn off but you have to unplug it to turn it back on again. then same thing with no change.
SOURCE: 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
SOURCE: 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
SOURCE: blue light in the front blinking no picutre no sound
This is the shutdown code for the lamp ballast. I would have a technician verify ballast is bad and replace. This can be a tricky repair for a novice because installation of the ballast requires that you remove the light engine. Hope this helps.
SOURCE: Blue light and lamp light flashing, no picture.
Look in the owners manual for the directions on how to remove the lamp. Your model the lamp goes in from the front on the left looking at the TV. There is a thumb screw in the back on the corner holding the left front speaker on. Under the panel there is another thumb screw holding the lamp door on. You will need a Phillips screw driver to remove the lamp. You will most likely find that the lamp is bad. You will either have to order a lamp directly from JVC, a service center or a parts distributor.
SOURCE: Our JVC 56in rear projection
The problem is one of the video drive IC's on the crt boards is bad. These IC's are located behind the front speaker grille. The board connected to the bottom of the crt's will have these ic's on them. They will be screwed into a metal "heatsink" The part number is TDA6111Q
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I have the exact same problem. Did you ever find a solution?
JVC AV-56WP74 My tv was on when it made a popping sound then the picture went black. I was able to turn off the tv right then but when I turned it right back on the picture was still black. I then tried to turn it off but it would not let me.I have to unplug the tv to shut it off. The blue indicator light comes right back on as soon as i plug it in like it never shut off. I really like the tv and am not ready to buy another. Please help.
same
same blue blinking
I have the same problem. Sent an e-mail to JVC support, they indicated it would be 5 business days for a response. I also like my TV and am not ready to buy a new one. As soon as I get an answer from someone I will post.
no sound and picture light blinks
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