REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Monday 11 March 2019

JVC LT-32EX19 SERVICE MODE

JVC LT-32EX19 SERVICE MODE


JVC LT-32EX19

SERVICE MODE 


ADJUSTMENT PREPARATION
(1) This TV is adjusted by using REMOTE CONTROL UNIT.
(2) The adjustment using the REMOTE CONTROL UNIT is made on the basic of the initial setting values. The setting values which adjust the screen to the optimum condition can be different from the initial setting values.
(3) Make sure that connection is correctly made AC to AC power source.
(4) Turn on the power of the TV and measuring instruments for warming up for at least 30 minutes before starting adjustments.
(5) If the receive or input signal is not specified, use the most appropriate signal for adjustment.
(6) Never touch the parts (such as variable resistors, transformers and condensers) not shown in the adjustment items of this service adjustment.
HOW TO ENTER THE SERVICE MODE
 Press [DISPLAY] key and [MUTING] key on the remote control unit simultaneously to enter the SERVICE MODE SCREEN.
 HOW TO EXIT THE SERVICE MODE
Press the [MENU] key to exit the Service mode.
CHANGE AND MEMORY OF SETTING VALUE SELECTION OF SETTING ITEM
• [[FUNCTION UP DOWN ] key.
For scrolling up / down the setting items.
CHANGE OF SETTING VALUE (DATA)
• [[FUNCTION LEFT RIGHT ] key.
For scrolling up / down the setting values.
MEMORY OF SETTING VALUE (DATA)
The setting value will be stored automatically when release the REMOTE CONTROL UNIT keys.
 ADJUSTMENT MODE
This mode is used to adjust the VIDEO CIRCUIT.
HOW TO ENTER THE ADJUSTMENT MODE
When the SERVICE MENU SCREEN of SERVICE MODE is displayed, press [1] key to enter the ADJUSTMENT MODE.
NOTE:
• When a number key other than the [1] key is pressed in the SERVICE MODE SCREEN, the other relevant screen may be displayed.
This is not used in the adjustment procedure. Press the [MENU] key to return to the SERVICE MODE SCREEN.
VSM PRESET MODE
This mode is used to adjust the VSM.
HOW TO ENTER THE VSM PRESET MODE
When the SERVICE MENU SCREEN of SERVICE MODE is displayed, press [6] key to enter the VSM PRESET MODE.
INITIAL SETTING VALUES IN THE SERVICE MODE
• Perform fine-tuning based on the "initial values" using the remote control when in the Service mode.
• The "initial values" serve only as an indication rough standard and therefore the values with which optimal display can be achieved may be different from the default values.
• <S004> to <S009> are the off set values.
WHITE BALANCE (HIGH LIGHT)
(1) Receive a PAL 75% all white signal.
(2) Set PICTURE MODE to "STANDARD".
(3) Set ZOOM to "FULL".
(4) Set WHITE BALANCE. to "MID".
(5) Select "1.ADJUST" from the SERVICE MODE.
(6) Adjustment is select item from <S001>(R DRIVE MID), <S002>(G DRIVE MID), <S003>(B DRIVE MID).
(7) Select <S001> item fix to 128 Other color <S002>, <S003> should be less than 128.
NOTE: Adjusttable range is 0000-0128 only (Don't over "0128").
(8) Must check white balance adjustment correctry with low light to high light.
VSM PRESET
(1) Select "VSM PRESET" from the SERVICE MODE.
(2) Set the initilal setting value of <Back Light> - <Tint>
SELF CHECK FEATURE OUTLINE
This unit comes with the "Self check" feature, which checks the operational state of the circuit and displays/saves it during failure.Diagnosis is performed when power is turned on, and information input to the main microcomputer is monitored at all time.Diagnosis is displayed in 2 ways via screen display and LED flashes. Failure detection is based on input state of I2C bus and the various control lines connected to the main microcomputer.
 HOW TO ENTER THE SELF CHECK MODE
(1) Press the [DISPLAY] key and [MUTING] key simultaneously, then enter the SERVICE MODE.
(2) Press the [2] key then enter the SELF CHECK MODE.
NOTE: When a number key other than the [2] key is pressed in the SERVICE MODE screen, the other relevant screen may be displayed.
This is not used in the SELF CHECK MODE. Press the [MENU] key to return to the MAIN MENU SCREEN.
HOW TO EXIT THE SELF CHECK MODE
To Save Failure History:
Turn off the power by unplugging the AC power cord plug when in the Self check display mode.
To Clear (Reset) Failure History:
Turn off the power by pressing the [POWER] key on the remote control unit when in the Self check display mode.
FAILURE HISTORY
Failure history can be counted up to 9 times for each item.  Failure history will be stored in the memory unless it has been deleted.
NOTE: Only SYNC (with/without sync signals) will be neither counted nor stored
POINTS TO NOTE WHEN USING THE SELF CHECK FEATURE
In addition to circuit failures (abnormal operation), the following cases may also be diagnosed as "Abnormal" and counted.
(1) Temporary defective transmissions across circuits due to pulse interruptions.
(2) Misalignment in the on/off timing of power for I2C bus (Vcc) when turning on/off the main power.
Therefore, turn on the main power, and then wait for about 3 seconds before starting Self check. If recurrences are expected, ensure to clear (reset) the failure history and record the new diagnosis results.
MEMORY IC REPLACEMENT PROCEDURE
1. POWER OFF
Switch off the power and disconnect the power plug from the AC outlet.
2. REPLACE THE MEMORY IC
Be sure to use the memory IC written with the initial setting values.
3. POWER ON
Connect the power plug to the AC outlet and switch on the power.
4. SERVICE MODE SETTING [SYSTEM CONSTANT SETTING]
(1) Press the [DISPLAY] key and [MUTING] key simultaneously, then enter the SERVICE MODE.
(2) Press the [8] key, then enter the SYSTEM CONSTANT SET SCREEN.
(3) Check the setting values of the SYSTEM CONSTANT SET. If the value is different, set the correct value with the [FUNCTION LEFT/RIGHT] key.
5. RECEIVING CHANNEL SETTING
Refer to the OPERATING INSTRUCTIONS and set the receive channels (Channels Preset) as described.
6. USER SETTING  
Check the user setting items according to the given in page later. Where these do not agree, refer to the OPERATING INSTRUCTIONS and set the items as described.
7. SERVICE MODE SETTING [ADJUST MODE SETTING] Verify what to set in the SERVICE MODE, and set whatever is necessary !!!
Posted By: FRANK at 03:12
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