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

2 Answers

Popping noises and no picture or sound

I had the tv on this morning and all of a sudden it blacked out and made some popping noises. Then the blue power indicator light kept blinking. I unplugged it and tried to turn it on but the same thing, popping noises no picture no sound. The popping noise almost sounds like a heart beat and gradually lowers in loudness and then stops thats when the blue power indidcator light starts to blink.

Posted by Steve Ingenhutt on

  • 2 more comments 
  • Bker Dec 31, 2007

    just bought a jvc av-48wp30 from a friend and transported in very cold weather with it snowing. was not coverered but it was a very light snow and didnt melt. tried to turn on 3 hrs later hopefully enough time to warm up and all i get is a solid blue power light which starts flashing after about 30 seconds. Does the flashing light mean it may not be fully warmed up yet or there may be condensation??

  • padidoe Feb 07, 2008

    Hi,



    My name is Greg and I have the same issue with my JVC AV-48WP74 as Stormshadow. Can you inform me of some steps that I may try before I call for repair? You can email me at [email protected] I actually tried the same steps by just leaving it unplugged for awhile and trying it again.



    Thanks

  • Anonymous Apr 29, 2008

    I had the tv
    on this morning and all of a sudden it blacked out and made some
    popping noises. Then the blue power indicator light kept blinking. I
    unplugged it and tried to turn it on but the same thing, popping noises
    no picture no sound. The popping noise almost sounds like a heart beat
    and gradually lowers in loudness and then stops thats when the blue
    power indidcator light starts to blink.

  • penny_moses May 18, 2009

    i get popping nosies from my JVC AV-48WP74 and no picture. the nosies last about 30 to 60 seconds and then goes away. The blue power light will flash on and off the entire time. Can anyone help me figure out what is wrong? I can't really afford the $500 repair bill. My e-mail is [email protected] thanks!!

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Anonymous

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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
[email protected]
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

Posted on Dec 06, 2007

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Deflection board failed

Posted on Aug 18, 2007

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