[TechAssist] Fw: JVC Self Destruct Circuit and a little Humor
- From: "Hugh @ Main TV" <maintv2004@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Fri, 12 Aug 2005 10:16:22 -0600
----- Original Message -----
From: "robert jeffery" <lj503@xxxxxxx>
Sent: Thursday, August 11, 2005 9:41 PM
Subject: JVC Self Destruct Circuit and a little Humor
> JVC Self Destruct Circuit and a little Humor
>
> Thursday night, August 11, 2005
>
> Hi OPEA Members and friends,
> Several days ago I sent a request for technical help for a member on a
> JVC AV-48WP30
> The following was received from Sam Sieben. This set has some sort of
> self-destruct function if you remove the back without unplugging the power
> cord first.
> Would you buy one of these sets?
> Anyway, thanks to Sam for sending the following information:
> See you,
> Lee
> -----
> There is a word of caution when working on this model...
> Sam Sieben, CET/CSM
> -------------------------------------------------------------
> Here is one to remember.
> If you remove the rear cover while the power cord is live you will destroy
> all DVI programming inside the DVI Digital Input Module! The only way to
> get this programming back into the unit is to send it to JVC that sends it
> to Japan!!
> This module is mounted on the rear AV Jack Board and has a light sensor
> built in. When light is detected the module does a complete reset and
> erases the EEPROM.
> JVC Models AV-48WP30, AV-36P902 and AV-61S902 and more, but I do not have
> a complete list. Use caution, If the unit has a DVI connector the unit may
> fall into this list.
> The Official Disassembly Instructions are:
> "1. Prior to disassembly, unplug the power cord from the AC outlet without
> fail.
> 2. Short the SB connector pin 1 and pin 2 of the Digital Input Module.
> 3. Before the rear panel is inserted into the cabinet, release the short
> circuit on the SB connector.
> 4. After releasing the short circuit between the SB connector, do not turn
> the power on until the rear panel is inserted into the cabinet.
> 5. Negligence in carrying out the above steps may cause the inactivation
> of the TV."
> We have found that un-plugging the two cables from the module removes
> power to it, and unless you need the DVI input connector during repair,
> this works as well.
> The unofficial word is that JVC uses this method to protect their software
> from being stolen. (rumor maybe )
> (Dave)
> ---------------------------------------------------------
> More info on this, since I am guilty of doing this twice!
> What is deprogrammed it the code for descrambling Copy Protected DVI data.
> Regular DVI, say from a computer card, ATSC tuner, or whatever is
> unaffected.
> A better way to prevent this, per JVC, is to completely disconnnect the
> DVI input board connectors while working on the set. Just be sure the AC
> plug is pulled when you reconnect the board.
> (Tom)
> ---------------------------------------------------------
> MOST of the sets have a warning label on the rear cover for the "Do it
> your selfer". But early production sets did not. When light enters the DVI
> module it clears the EEPROM and now the set will not decode DVI protected
> material.
> Hence, no DVI functions. To "Fix" this one I was told the module has to be
> returned to Japan. (to protect copyright decoding software ) However they
> do have them in stock for exchange.
> Shannen, Yes, it is true. Panasonic does own JVC. Yes, Aiwa is owned by
> Sony.
> (Dave)
> -----------------------------------------------------------
> JVC AV-48WP30 16x9 hdtv ready (date of manufacture: Feb 2002)
> this is the second set we have pulled "new" out the box with this problem.
> symptom explained as a small pic pulsating in size with no convergence
> correction, callapsing vertically, black bars through pic when present.
> cure: C931 broken lead(s)
> (Sean)
> -------------------------------------------------------------
> A minor point. DVI from a signal generator will still work. DVI with an
> encoded security handshake from a cable box, media center, or satellite
> receiver will not work. It is the handshake process that is erased.
> (Tom)
> -------------------------------------------------------------
> 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)
> ---------------------
> A little Humor:
> 17. CHANGE IS INEVITABLE, EXCEPT FROM VENDING MACHINES.
> 18. GET A NEW CAR FOR YOUR SPOUSE. IT'LL BE A GREAT TRADE!
> 19. PLAN TO BE SPONTANEOUS TOMORROW.
>
>
>
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