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-42DV1BJ SERVICE MODE AND POWER SUPPLY CIRCUIT

JVC LT-42DV1BJ SERVICE MODE AND POWER SUPPLY CIRCUIT


 
ADJUSTMENT PREPARATION
(1) There are 2 ways of adjusting this TV : One is with the REMOTE CONTROL UNIT and the other is the conventional method using adjustment parts and components.
(2) The adjustment using the REMOTE CONTROL UNIT is made on the basis 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.
PRESET SETTING BEFORE ADJUSTMENTS
Unless otherwise specified in the adjustment items, preset the following functions with the REMOTE CONTROL UNIT.
Setting item
Settings position
Picture Mode
Standard
Picture Adjustments
Centre
Colour Temp.
Normal
Super Digipure
Auto
Movie Theatre
Auto
Colour Management
On
Picture Management
On
Zoom
Full

MEASURING INSTRUMENT AND FIXTURES
• Signal generator (Pattern generator) [PAL]
• Remote control unit
BASIC OPERATION OF SERVICE MODE
HOW TO ENTER THE SERVICE MODE
(1) Press [INFORMATION] key and [MUTING] key on the remote control unit simultaneously to enter the SERVICE MODE SCREEN.
(2) In the SERVICE MENU, press the [1] key to display ADJUSTMENT MODE SCREEN
HOW TO EXIT THE SERVICE MODE
Press the [BACK] key to exit the Service mode.
SERVICE MODE ITEMS
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.
COLOUR TEMP.
(2) SETTING ITEM NAME
Setting item name are displayed.
(3) SETTING ITEM NO.
Setting item numbers are displayed. The setting item numbers to be displayed are listed below.
Item No
Item
Variable range
Setting value
S001
R DRIVE
000 - 255
000
S002
G DRIVE
000 - 255
000
S003
B DRIVE
000 - 255
000

(4) SETTING VALUE (DATA)
The SETTING VALUE is displayed.
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)
Changed setting value is memorized by pressing [MUTING] key.
MONITOR MODE
This mode displays the signal status of channel that has been selected now.
SYSTEM CONFIGRATION
This mode selects the function that can be used by the user menu.
SOFTWARE UPDATE
This mode updates the version of software.
I2C STOP MODE [NO DISPLAY]
This mode is unused.
EDID WRITE PROTECT
This mode sets memory with EDID data to write protection.
HDMI_EQ SETTING
This mode switches HDMI1.3 compliant and AWG28.
SOFTWARE VERSION CHECK
This mode displays the version of microcomputer software and memory.
SOUND CALIBRATION SETTING
This mode sets SOUND CALIBRATION.
ADJUSTMENT PROCEDURE
Item
Measuring
instrument
Adjustment part
Description
SOUND
CALIBRATION
Remote control unit
[9. Calibration Setting]
(1) Receive any bilingual broadcast.
(2) Select "9. Calibration Setting" from the SERVICE
MODE.
(3) Press the "OK" key to start the calibration.
(4) After "Finish" is displayed, press the [MENU] key to
exit the menu.
WHITE BALANCE
(HIGHLIGHT)
Remote control unit
Signal generator

[1. Adjust]
S001: R DRIVE (Red drive)
S002: G DRIVE (Green drive)
S003: B DRIVE (Blue drive)

(1) Receive a PAL 75% all white signal.
(2) Set PICTURE MODE to "STANDARD".
(3) Set ZOOM to "FULL".
(4) Set COLOUR TEMP. to "NORMAL".
(5) Select "1. Adjust" from the SERVICE MODE.
(6) Adjust to Keep one of <S001> (Red drive),
<S002> (Green drive) or <S003> (Blue drive)
unchanged, then lower the other two so that the all
white screen is equally white throughout.
NOTE:
Set one or more of <S001>, <S002>, and <S003>
to "000".
(7) Check that white balance is properly tracked from low
light to high light. If the white balance tracking is
deviated, adjust to correct it.
(8) Press the [MUTING] key to memorize the set value.

SELF CHECK FUNCTIONS OUTLINE
This model has a "Self-diagnosis function," which checks the operation state of the circuits inside the set, and informs us of a failure.
Diagnosis is performed when the power is turned on, and information input to the main microcomputer is monitored at all time. The
diagnosis is displayed by LED flashing.
INDICATION OF SELF DIAGNOSIS BY USING LED
Flashing LEDs located on the front panel indicate the result of self-diagnosis.
Type of error
POWER LED flash cycle
Low bias line short
protection
Repeating slow flashes 9 times and fast
flashes 9 times.
<Explanation of operation>
If an error is detected, the power is turned off.
Shortly after the power is turned off, the POWER LED will be blinked.
Power cannot be turned on until the power cord takes out and inserts, after the power is turned off.
POWER SUPPLY CIRCUIT 
CLICK ON THE IMAGES TO ZOOM IN
Posted By: FRANK at 06:28
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