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!

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All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Friday 8 March 2019

JVC LT-26WX84 LCD TV SERVICE MODE AND POWER SUPPLY CIRCUIT

JVC LT-26WX84 LCD TV SERVICE MODE AND POWER SUPPLY CIRCUIT

JVC LT-26WX84 

LCD TV 

SERVICE MODE AND POWER SUPPLY CIRCUIT 

MEMORY IC REPLACEMENT PROCEDURE
(1) Power off
Switch off the power and disconnect the power cord from the wall outlet.
(2) Replace the memory IC
Initial value must be entered into the new IC.
(3) Power on
Connect the power cord to the wall outlet and switch on the power.
(4) SERVICE MODE setting
Before entering the SERVICE MODE, confirm that the setting of TV/CATV SW of the REMOTE CONTROL UNIT is at the "TV" side and the setting of VCR/DVD SW of the REMOTE CONTROL UNIT is at the "VCR" side. If the switches have not been properly set, you cannot enter the SERVICE MODE.
a) Press [SLEEP TIMER] key and, while the indication of SLEEP TIMER 0 MIN is being displayed, press [DISPLAY] key and [VIDEO STATUS] key on the remote control unit simultaneously.
b) The SERVICE MODE screen  is displayed.
c) Verify what to set in the SERVICE MODE, and set whatever is necessary  Refer to the SERVICE ADJUSTMENT for setting.
d) Press the [BACK] key twice to return normal screen.
(5) Receive channel setting
Refer to the OPERATING INSTRUCTIONS (USER'S GUIDE) and set the receive channels (Channels Preset) as described.
(6) User settings
Check the user setting items according to after page. Where these do not agree, refer to the OPERATING INSTRUCTIONS (USER'S GUIDE) and set the items as described.
HOW TO ENTER THE SERVICE MODE
NOTE:
Ensure that the cursor (arrow) of the User Menu screen is pointing at Picture Control.
Before entering the SERVICE MODE, confirm that the setting of TV / CATV switch of the REMOTE CONTROL UNIT is at the "TV" side and the setting of VCR / DVD switch is at the "VCR" side. If the switches have not been properly set, you cannot enter the SERVICE MODE.
(1) Set to 0 minutes using the [SLEEP TIMER] key.
(2) Press the [VIDEO STATUS] key and [DISPLAY] key simultaneously, then enter the SERVICE MODE mode.
(3) When the Main Menu is displayed, press any key of the [0] to [9] key to enter the corresponding menu mode.
*Press any of the [0] to [9] keys before the SERVICE MODE mode disappears.
(4) Select the service item using the [ CH + ] / [ CH - ] key.
(5) Set the value using the [ VOL + ] / [ VOL - ] key.
(6) Press the [MUTING] key to save the value.

HOW TO EXIT THE SERVICE MODE
Press the [ BACK ] key to exit the Service 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. But, don't change the values that are not written in "ADJUSTMENT PROCEDURE". They
are fixed values
COMPONENT INPUT BLACK LEVEL
(1) Input 525i signal that shows brightness gradation with 0% black into a component input terminal.
(2) Set “VIDEO STATUS” to STANDARD.
(3) Set “ASPECT” to FULL.
(4) Select "COLOR TEMPERATURE" to "LOW".
(5) Select "1.PICTURE/SOUND" from the SERVICE MODE.
(6) Set < F44 > (Picture control) to "001" and < F45 >
(Picture control mode sw) to "000" to set Y ADJUST MAX MODE.
(7) Set < F46 > (Output level upon detection),< F47 > (Minimum value upon detection), and < F48 >
(Maximum value upon detection).
(8) Press the [MUTING] key to memoirze the set value.
(9) Select "8.PP" from the SERVICE MODE.
(10) Adjust < ADM013 > (G OFFSET) to set the 0% black part on the upper half of the screen to maximum brightness.
(11) Add reference offset value "0" to the < ADM013 > (G OFFSET) value.
(12) Press the [MUTING] key to memoirze the set value.
(13) Select "1.PICTURE/SOUND" from the SERVICE MODE.
(14) Check the black level. Adjust the black level again if it is not proper.
(15) Set < F44 > (Picture control) to "001" to cancel Y ADJUST MAX MODE.
(16) Press the [MUTING] key to memoirze the set value.
(17) Input 1125i signal.
(18) Repeat steps (5) to (15) above.
(19) Press the [MUTING] key to memoirze the set value.
COMPONENT INPUT A-D CONVERTER GAIN
(1) Input 525i 100% all-white signal into a component input terminal.
(2) Set "VIDEO STATUS" to STANDARD.
(3) Set "ASPECT" to FULL.
(4) Select "COLOR TEMPERATURE" to "LOW".
(5) Select "1.PICTURE/SOUND" from the SERVICE MODE.
(6) Set < F44 > (Picture control) to "001" and < F45 >
(Picture control mode sw) to "000" to set Y ADJUST MAX MODE.
(7) Set < F46 > (Output level upon detection), < F47 >
(Minimum value upon detection), and < F48 >
(Maximum value upon detection.
(8) Press the [MUTING] key to memoirze the set value.
(9) Select "8.PP" from the SERVICE MODE.
(10) Adjust < ADM010 > (G GAIN) to set the upper half of the screen to maximum brightness
(11) Press the [MUTING] key to memoirze the set value.
(12) Check the black level. Perform the "BLACK LEVEL Adjustment" again if the adjusted value is not proper.
(13) Select "1.PICTURE/SOUND" from the SERVICE MODE.
(14) Set < F44 > (Picture control) to "000" to cancel Y ADJUST MAX MODE.
(15) Press the [MUTING] key to memoirze the set value.
(16) Input 1125i signal.
(17) Repeat steps (5) to (14) above.
(18) Press the [MUTING] key to memoirze the set value
COMPONENT INPUT A-D CONVERTER OFFSET
(1) Input 525i component 30% all-white signal into a component input terminal.
(2) Set "VIDEO STATUS" to STANDARD.
(3) Set "ASPECT" to FULL.
(4) Select "COLOR TEMPERATURE" to "LOW".
(5) Select "1.PICTURE/SOUND" from the SERVICE MODE.
(6) Set < F44 > (Picture control) to "001" and < F45 > (Picture control mode sw) to "003" to set the chrominance adjustment zero mode.
(7) Set < F46 > (Output level upon detection), < F47 >
(Minimum value upon detection), and < F48 > (Maximum value upon detection).
(8) Press the [MUTING] key to memoirze the set value.
(9) Select "8.PP" from the SERVICE MODE.
(10) Change the value of < ADM014 > (B OFFSET) from the initial value in the range of ±5 to set the upper half of the screen magenta.
(11) Adjust < ADM012 > (R OFFSET) to change the upper half of the screen from magenta to blue.
(12) Take a note of the value of < ADM012 > (R OFFSET) adjusted in (11).
(13) Change the value of < ADM012 > (R OFFSET) from the value that you have taken note of in the range of ±5 to set the upper half of the screen magenta.
(14) Adjust < ADM014 > (B OFFSET) to change the upper half of the screen from magenta to red.
(15) Return the value of < ADM012 > (R OFFSET) to the value that you have taken note of in (12).
(16) Press the [MUTING] key to memoirze the set value.
(17) Set the SPLIT screen mode.
(18) Input monochrome signal such as cross hatch both to the right and the left screen.
(19) Set < ADM012 > (R OFFSET) and < ADM014 > (B OFFSET) to the same values as in single-screen mode.
(20) Press the [MUTING] key to memoirze the set value.
(21) Set < F44 > (Picture control) to "000" to cancel the chrominance adjustment zero mode.
(22) Input 1125i 30% all-white signal.
(23) Repeat steps (5) to (21) above.
(24) Press the [MUTING] key to memoirze the set value.
COMPOSITE INPUT BLACK LEVEL
(1) Input NTSC signal that shows brightness gradation with 0% black.
(2) Set "VIDEO STATUS" to STANDARD.
(3) Set "ASPECT" to FULL.
(4) Select "COLOR TEMPERATURE" to "LOW".
(5) Select "1.PICTURE/SOUND" from the SERVICE MODE.
(6) Set < F44 > (Picture control) to "001" and < F45 >
(Picture control mode sw) to "000" to set Y ADJUST MAX MODE.
(7) Set < F46 > (Output level upon detection), < F47 >
(Minimum value upon detection), and < F48 > (Maximum value upon detection).
(8) Select "2. YC SEP" from the SERVICE MODE.
(9) Adjust < YCM131 > (BRIGHTNESS) so that 0% part of gradation is the brightest. (Fig. 6)
(10) Press the [MUTING] key to memoirze the set value.
(11) Select "1.PICTURE/SOUND" from the SERVICE MODE.
(12) Set < F44 > (Picture control) to "000" to cancel Y ADJUST MAX MODE.
(13) Press the [MUTING] key to memoirze the set value.
WHITE BALANCE (HIGHLIGHT)
(1) Input NTSC 75% all-white signal.
(2) Set "VIDEO STATUS" to STANDARD.
(3) Set "ASPECT" to FULL.
(4) Select "COLOR TEMPERATURE" to "LOW".
(5) Select "1.PICTURE/SOUND" from the SERVICE MODE.
(6) Fix one of < S13 > (R DRIVE), < S15 > (G DRIVE), or < S17 > (B DRIVE). Lower the two that are not fixed so that the all-white screen is equally white throughout.
Set one or more of < S13 >, < S15 >, and < S17 > to "255".
(7) Check that white balance is properly tracked from lowlight to highlight.
(8) Press the [MUTING] key to memoirze the set value.
(9) Input 1125i 75% all-white signal.
(10) Repeat steps (5) to (8) above.
(11) Input 525i all-white signal.
(12) Repeat steps (5) to (8) above.
HOW TO ENTER THE SELF-DIAGNOSIS DISPLAY MODE
Before entering the Self-diagnosis Display mode, confirm that the setting of TV / CATV SW of the REMOTE CONTROL UNIT is at the "TV" side and the setting of VCR / DVD SW is at the "VCR" side. If the switches have not been properly set, you cannot enter the Self-diagnosis Display mode.
(1) Press the [SLEEP TIMER] key and set it to 30 minutes.
(2) Press the [VIDEO STATUS] key and [DISPLY] key simultaneously, then enter the TEST MODE.
(3) Press the [4] key (Self-diagnosis Display mode) before the service mode screen disappears.
(4) Press the [MTS] key to enter Page 2 of the Self-diagnosis Display mode.
*Use the [MTS] key to toggle between Page 1 and Page 2.
NOTE:
The remote control unit attached to this set does not contain the [MTS] key. To perform the procedure (4), use a remote control unit that contains the [MTS] key.
HOW TO EXIT THE SELF-DIAGNOSIS DISPLAY MODE
To Save Failure History:
Turn off the power by unplugging the AC power cord plug when in the self-diagnosis 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-diagnosis display mode.
POWER SUPPLY CIRCUIT 
LCA90149-03E
SSB9086
CLICK ON THE IMAGE TO ZOOM IN
Posted By: FRANK at 03:14
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