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TV discoloration problem on JVC model AV-48WP74

Hi All,
I have a 6 years old TV with discoloration problems. JVC model AV-48WP74. I don't have the owner manual and don't know how to fix it. Could you give me some help. Thanks a bunch.

Mark

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6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

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

have same brand but 56 inch, did the same thing with moving lamp ,it was ok until the others colors did the same thing only way to fix is to have local tv repair to change convergence chip 300.00

Posted on Jul 29, 2007

  • 9 Answers

SOURCE: 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

Posted on Aug 18, 2007

likha
  • 790 Answers

SOURCE: I have the JVC AV-48wp74

ok! you have defctive convergence correction circuit! thats why the color is abnormally function!

Posted on Oct 21, 2007

  • 12 Answers

SOURCE: JVC AV-48WP74

havent had time to check these things out but here is some raw research I have done

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

Posted on Dec 06, 2007

ladywinn
  • 5138 Answers

SOURCE: JVC AV-27720 27" TV manual

GO to www.Service Manuals.net you should be able to find it there!ThankYou for using FixYA.Have a Nice Day.

Posted on Feb 17, 2008

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1 Answer

I have a JVC AV-48WP74 48 in. Rear Projection


Must know basic soldering and have tools like soldering iron,a desoldering pump or desoldering witchs to replaced parts on the tv convergencce board.U have none of these tools devices and never solder bsfore,better hire the tv tech. to do the job.Cost estimate 300-350 for parts and labors.Tries wesite like Tvrepairworld.com,Tvrepairkits.com to buy a whole convergence kit,to do it ur self,if u can?

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

1 Answer

JVC AV-48WP74 convergence


The ICs are most likely defective if the old ones allow the set to power up.

Nov 20, 2009 | JVC AV-48WP74 48" Rear Projection...

1 Answer

Deflection Boards Compatible?


I just checked and the part # is SSB-2051A-M2 and is the same for both models.........Go for it !!!!

Sep 01, 2009 | JVC AV-48WP74 48" Rear Projection...

1 Answer

JVC AV-48WP74 48 in


http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html
Sony Convergence
http://www.techlore.com/blog/entry/19694/Sony-Convergence-Repair-My-Sony-TV-has-a-distorted-picture-/
http://www.techlore.com/article/19631/Sony-Convergence-Procedure/

Jan 24, 2008 | JVC AV-48WP74 48" Rear Projection...

1 Answer

Convergance Board JVC AV-48WP74


it will have a large heatsink with at least two large IC with the numbers STK392-xxxx
http://home.earthlink.net/~oleg.filippov/ConvergenceFix.htm
http://cmpalmer.blogspot.com/2006/11/fixing-my-own-tv-part-ii.html

Jan 09, 2008 | JVC AV-48WP74 48" Rear Projection...

1 Answer

Color convergence


RICKY-SOUNDS LIKE THE USUAL CONVERGENCE IC FAILURE.TRY LOOKING IN W/BACK OFF TV AND YOU'LL SEE COUPLE OF STK392-??? IC CHIPS,LOCATED ON A BIG METAL HEAT SINK.RETRIEVE THE EXACT PART # AND YOU CAN ORDER THEM AND INSTALL THEM YOURSELF IF YOU ARE GOOD AT SOLDERING ELECTRONIC PARTS,IF NOT BEST BET IS CALL AN EXPERIENCED JVC TECH.JOE TV

Nov 27, 2007 | JVC AV-48WP74 48" Rear Projection...

1 Answer

MY TV!!


try using AV im puts with dvd or vcr if this work your tuner is bad new cost aruond $90 to 120 if available but next year you wont have use for it

Sep 25, 2007 | JVC AV-48WP74 48" Rear Projection...

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