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 !

Wednesday, 11 December 2019

PANASONIC CT-L1400 - LH13 CHASSIS LCD TV HOW TO ENTER THE SERVICE MODE, SERVICE ADJUSTMENTS IN DETAILS - LH13 CHASSIS


Self-check function
When phenomena like "the power fails from time to time" or "the video/audio fails from time to time" can not be confirmed at the time of servicing, the self-check function can be used to confirm the occurrence and to limit the scope for the defective circuits. When "the power fails from time to time", display on the screen can be used to confirm the occurrence and to limit the scope for the defective circuits.
Any programmed channels, channels caption data and some other user defined settings will be erased and return to factory setting.
Access
Produce TV reception screen and, while pressing [VOLUME-] button on the main unit, press [SLEEP] button on the remote controller unit simultaneously.
Exit
When one of the buttons for channel selection etc. is pressed, the display returns to the normal screen.
How to remove the connectors
Disassembly
Rear cover

1. Thick cloth and so on is down not to damage a LCD screen, and the unit is pushed down.
2. Remove the screw (1 pcs), and detach the hinge cover and the AV cable cover
3. Remove the screws (7 pcs), the screws (2 pcs), and the screws (4 pcs), and detach the rear cover and top cover.
AP-BOARD
1. Remove the rear cover.
2. Remove the screws (5 pcs) and the screws (2 pcs) and detach the shield plate.
3. Disengage the shaft holder hook and detach the power button shaft.
4. Remove the screw (1 pcs) and disconnect the couplers (B2 (AP2) and B3 (AP3)) between B-Board and the AP-Board
5. Disconnect the couplers (AP4, AP5, AP6, AP7 and AP8) the flexible cable (AP1 and AP9) and remove the screws (3 pcs) and detach the AP-Board.
[Caution: PCB Fixing screws driving torque: 0.2-0.3 N·m (2-3kg·mm) Do not tighten screws so hard.]
DG-Board
1. Remove the rear cover.
2. Remove the screws (5 pcs) and the screws (2 pcs) and detach the shield plate.
3. Disconnect the flexible cable (DG4 and DG5) and remove the screws (2 pcs) and detach the DG-Board.
[Caution: PCB Fixing screws driving torque: 0.2-0.3 N·m (2-3kg·mm). Do not tighten screws so hard.]
V-Board
1. Remove the rear cover.
2. Remove the screw (1 pcs) and disconnect the couplers (V2 and V3) and the flexible cable (V9) and detach the V-Board.
Speaker (L, R)
1. Remove the rear cover.
2. Remove the screw (1 pcs) and the screws (6 pcs) and disconnect the couplers (V2 and V3) and the Speakers (L,R).
B-Board
1. Remove the rear cover.
2. Remove the screw (5 pcs) and the screws (2 pcs) and detach the shield plate.
3. Remove the screw (1 pcs) and disconnect the couplers (B2 (AP2) and B3 (AP3)) between B-Board and the AP-Board.
Caution: PCB Fixing screws driving torque: 0.2-0.3 N·m (2-3kg·mm) Do not tighten screws so hard.
K-Board
1. Remove the rear cover.
2. Remove the screws (5 pcs) and the screws (2 pcs) and detach the shield plate.
3. Disconnect the coupler (AP8) and disengage the hook (2 pcs) and detach the K-Board.
[Caution: PCB Fixing screws driving torque: 0.2-0.3 N·m (2-3kg·mm)
Do not tighten screws so hard.]
LCD panel
1. Remove the rear cover.
2. Remove the screws (5 pcs) and the screws (2 pcs) and detach the shield plate.
3. Disengage the shaft holder hook and detach the power button shaft.
4. Disconnect the coupler (AP8) and detach the circuit board K bracket with K-Board.
5. Remove the screw (1 pcs) and disconnect the couplers (B2 (AP2) and B3 (AP3)) between B-Board and the AP-Board.
6. Disconnect the couplers (AP4, AP6, BL4 and BL6) and the flexible cable (AP9, DG4 and DG5) and remove the screws (7 pcs) and detach the AP-Board, DG-Board and BL-Board
7. Remove the screws (2 pcs), detach the LCD panel.
How to enter into adjustment mode
While pressing [VOLUME-] button of the main unit, press [RECALL] button of the remote control transmitter three times in a row (within 2 seconds).
Adjustment method.....Use the remote control.
“1” button...Main items Selection in forward direction
“2” button...Main items Selection in reverse direction
“3” button...Sub items Selection in forward direction
“4” button...Sub items Selection in reverse direction
Cancellation
Switch off the power with the [POWER] button on the main unit or the [POWER] button on the remote control.
Contents of adjustment mode
 Value is shown as a hexadecimal number.
 Preset value differs depending on models.
 After entering the adjustment mode, take note of the value in each item before starting adjustment.
[[GAMMA adjustment is for factory adjustment only. Do not change the value.]]
NTSC picture RF
Receive 75% color bar signal
 Enter the adjustment mode and adjust the amplitude level of each signal in the following steps.
1. Y signal
With [VOLUME+/-] buttons of the remote control transmitter, adjust the value appearing below YGAIN indication so that the value below MAX indication becomes B8.
2. B-Y signal (TP238)
With [VOLUME+/-] buttons of the remote control transmitter, adjust the value appearing below B-Y indication so that the amplitude (white-blue) at TP238 becomes 0±0.03V.
3. R-Y signal (TP236)
With [VOLUME+/-] buttons of the remote control transmitter, adjust the value appearing below R-Y indication so that the amplitude (white-red) at TP236 becomes 0±0.03V.
NTSC picture video (VBS)
Receive 100% color bar signal at video input 1.
 Enter the adjustment mode and adjust the amplitude level of each signal in the following steps.
1. Y signal
With [VOLUME+/-] buttons of the remote control transmitter, adjust the value appearing below YGAIN indication so that the value below MAX indication becomes B8.
2. B-Y signal (TP238)
With [VOLUME+/-] buttons of the remote control transmitter, adjust the value appearing below B-Y indication so that the amplitude (yellow-blue) at TP238 becomes 0±0.03V.
3. R-Y signal (TP236)
With [VOLUME+/-] buttons of the remote control transmitter, adjust the value appearing below R-Y indication so that the amplitude (cyan-red) at TP236 becomes 0±0.03V.
NTSC picture video (S terminal)
Receive 100% color bar signal at video input 1 (S terminal).
 Enter the adjustment mode and adjust the amplitude level of each signal in the following steps.
1. Y signal
With [VOLUME+/-] buttons of the remote control transmitter, adjust the value appearing below YGAIN indication so that the value below MAX indication becomes B8.
2. B-Y signal (TP238)
With [VOLUME+/-] buttons of the remote control transmitter, adjust the value appearing below B-Y indication so that the amplitude (yellow-blue) at TP238 becomes 0±0.03V.
3. R-Y signal (TP236)
With [VOLUME+/-] buttons of the remote control transmitter, adjust the value appearing below R-Y indication so that the amplitude (white-red) at TP236 becomes 0±0.03V.
NTSC Component (525i) level adjustment
Receive 100% color bar signal at video input 1 (S terminal).
 Enter the adjustment mode and adjust the amplitude level of each signal in the following steps.
1. Y signal
With [VOLUME+/-] buttons of the remote control transmitter, adjust the value appearing below YGAIN indication so that the value below MAX indication becomes DC.
2. B-Y signal (TP238)
With [VOLUME+/-] buttons of the remote control transmitter, adjust the value appearing below B-Y indication so that the amplitude (yellow-blue) at TP238 becomes 0±0.03V.
3. R-Y signal (TP236)
With [VOLUME+/-] buttons of the remote control transmitter, adjust the value appearing below R-Y indication so that the amplitude (cyan-red) at TP236 becomes 0±0.03V.
NTSC Component (525p) level adjustment
Receive 100% color bar signal at video input1 (S terminal).
 Enter the adjustment mode and adjust the amplitude level of each signal in the following steps.
1. Y signal
With [VOLUME+/-] buttons of the remote control transmitter, adjust the value appearing below YGAIN indication so that the value below MAX indication becomes B8.
2.B-Y signal (TP238)
With [VOLUME+/-] buttons of the remote control transmitter, adjust the value appearing below B-Y indication so that the amplitude (white-blue) at TP238 becomes 0±0.03V
3. R-Y signal (TP236)
With [VOLUME+/-] buttons of the remote control transmitter, adjust the value appearing below R-Y indication so that the amplitude (white-red) at TP236 becomes 0±0.03V.
Flicker Adjustment
1. Enter the adjustment mode and select the " FLICKR".
2. Adjust the Flicker Adjustment until the flicker displayed on the screen is minimum.
Note: Adjustment shall be done after it is made to overrun value of adjustment once as shown figure A.
Note: Make the adjustment to look for the optimum point because the level of flicker doesn´t disappear on the screen completely.
MTS Adjustment
Caution: MTS adjustment shall be after the aging of 30 minutes or longer.
1 Apply following RF signal at Antenna input.
VIDEO : Flat field, 30 % modulation
AUDIO : 300 Hz, 100 % modulation, monaural (70 dB ± 5 dB, 75 , P/S 10 dB)
Note: Make sure 75 us PRE-EMPHASIS is off.
2. Adjust "MTSIN" data (Input level) until the RMS voltage meter indicates 106 mVrms ± 6 mVrms.
1. Select STEREO mode in the AUDIO Menu.
2. Set “Audio volume” DAC to “40”.
3. Apply following RF signal at Antenna input.
VIDEO : Flat field, 30% modulation
AUDIO : 300Hz, 30% modulation, STEREO (LEFT only)
(70dB ± 5dB, 75  OPEN, P/S 10dB)
Note: After setting 30% modulation with PL SW and NR SW off, turn PL SW and NR SW on.
4. Adjust "SEPAL" data (Low-level separation) until the amplitude.
5. Apply following RF signal at Antenna input.
VIDEO : Flat field, 30% modulation.
AUDIO : 3kHz, 30% modulation, STEREO (LEFT only)
(70dB ± 5dB, 75 OPEN, P/S 10dB)
Note: After setting 30% modulation with PL SW and NR SW off, turn PL SW and NR SW on.
6. Adjust "SEPAH" data (High-level separation) until the amplitude of the waveform on the oscilloscope is minimum.
7. Repeat steps 3. to 6. until Low-level separation and High-level separation satisfy above-mentioned conditions.
Note: The separation must be more than 20 dB at 300Hz and 3kHz.
Hotel Mode
Go into Hotel Mode:
Change EEPROM Address 00EF from 00 to 80.
Back to Normal Mode:
Change EEPROM Address from 80 to 00.
Note : Hotel mode cannot be cleared by SELFCHECK
Hotel Mode Setting:
Hold the “VOLUME DOWN” button inside the door of unit and
press the “TV/VIDEO” button on the remote control three times within 1 seconds.
Exiting the Hotel Mode Setting:
Press “Power” button on the remote control or on the unit.
POWER ON SETTING
DON’T: No setting

CH: Set Channel number when turn on the unit.
VOLUME: Set Volume level when turn on the unit.
CH/VOLUME: Set Channel number and Volume level when turn on the unit.
CH/VIDEO setting
For Channel number setting:
For VIDEO INPUT setting :
Press “VOL UP/DOWN” button on the remote control.
Press “VTV/VIDEO” button on the remote control.
For Channel number setting:
For VIDEO INPUT setting :
Press “VOL UP/DOWN” button on the remote control.
Press “VTV/VIDEO” button on the remote control.
VOLUME setting
Press “VOL UP/DOWN” button on the remote control.
VOLUME MAX setting
To set the volume max level:
Press “VOL UP/DOWN” button on the remote control.
Note: On-screen value is changed normally from 0 to 63 after setting. But maximum output sound level is limited according to this setting
OSD STOP DISPLAY setting
ALL: No ON-SCREEN display
PATTERN1: Channel number and TV/Video status are displayed when changing the channel or TV/Video.
PATTERN2: ASPECT (4:3 / 16:9) is displayed when changing the ASPECT.
PATTERN3: PATTERN1 and PATTERN2.
Channel number, TV/Video status and ASPECT are displayed when changing the channel, TV/Video or Aspect.
KEY STOP OPERATION setting
ALL: All buttons on the unit (TV/VIDEO, VOL up/down, CH up/down) are not effective.
PATTERN1: VOL up/down and CH up/down buttons on the unit are not effective.
PATTERN2: Same as PATTERN1
PATTERN3: Same as PATTERN1
Note: All buttons on the remote control are effective in any KEY STOP OPERATION setting.
Pressing VOL Down button on the unit for setting Hotel mode is effective.
To Change address 00EF from 00 to 80 in Memory Edit Mode.
Entry to the Serviceman Mode
Hold the “VOLUME DOWN” button inside the door of unit and
press the “RECALL” button on the remote control three times within 1 seconds.
Select main item OTP:
Press “1” or “2” button on the remote control.
Entry to the Memory Edit Mode /Some information indication
press the “MUTE” button on the remote control for more than 3 seconds in OPT menu.
Select ADDRESS “00EF”:
1. Press ”3” button on the remote control to change address.
Change DATA to “80”:
1. Press “VOLUME UP/DOWN” button to change data.
2. Press “6” button for 3 seconds to store the data.
TV unit go into Hotel Mode.
Exiting the Service Mode:
Press “Power” button on the remote control or on the unit.
Serviceman Mode
Entry to the Serviceman Mode
Hold the “VOLUME DOWN” button inside the door of unit and
press the “RECALL” button on the remote control three times within 1 seconds.
Adjust Item SELECTION:
Press “1” or “2” button on the remote control.
Press “1”.
Exiting the Serviceman Mode
Press “Power” button on the remote control or on the unit.
OPT (Option)
Entry to the Memory Edit Mode /Some information indication

press the “MUTE” button on the remote control for more than 3 seconds in OPT menu.
Exiting the Memory Edit Menu
Press “1” or “2” button on the remote control.
Entry to the Memory Edit Mode
press the “MUTE” button on the remote control for more than 3 seconds in OPT menu.
Exiting the Memory Edit Menu
Press “1” or “2” button on the remote control.
Changing Address & Data for EEPROM (in Memory Edit Menu)
Exiting the Memory Edit Menu
Press “1” or “2” button on the remote control.
Exiting the Serviceman Mode
Press “Power” button on the remote control or on the unit.
RM (Remote Control Code)
Select Remote Control Code, A or B:
Press VOL UP to set Code A.
Press VOL DOWN to set Code B.
Selected Code will be effective after turn off the unit by pressing POWER button on the unit or remote control.
To change the Code of Remote Control
1. Remove the cover with 3 screws
2. Short JP1 to change the Code B.
3. Close the cover]]
Hotel Mode
Go into Hotel Mode
Change EEPROM Address 00EF from 00 to 80.
Back to Normal Mode:
Change EEPROM Address from 80 to 00.
Note : Hotel mode can not be cleared by SELFCHECK.
Hotel Mode Setting
Hold the “VOLUME DOWN” button inside the door of unit and
press the “TV/VIDEO” button on the remote control three times within 1 seconds.
Exiting the Hotel Mode Setting
Press “Power” button on the remote control or on the unit.
POWER ON SETTING
DON’T: No setting
CH: Set Channel number when turn on the unit.
VOLUME: Set Volume level when turn on the unit.
CH/VOLUME: Set Channel number and Volume level when turn on the unit.
CH/VIDEO setting
For Channel number setting: Press “VOL UP/DOWN” button on the remote control.
For VIDEO INPUT setting: Press “VTV/VIDEO” button on the remote controlVOLUME setting
Press “VOL UP/DOWN” button on the remote control.
VOLUME MAX
To set the volume max level:
Press “VOL UP/DOWN” button on the remote control.
Note: On-screen value is changed normally from 0 to 63 after setting. But maximum output sound level is limited according to this setting.
OSD STOP DISPLAY
ALL: No ON-SCREEN display
PATTERN1: Channel number and TV/Video status are displayed when changing the channel or TV/Video.
PATTERN2: ASPECT (4:3 / 16:9) is displayed when changing the ASPECT.
PATTERN3: PATTERN1 and PATTERN2.
Channel number, TV/Video status and ASPECT are displayed when changing the channel, TV/Video or Aspect.
KEY STOP OPERATION
ALL: All buttons on the unit (TV/VIDEO, VOL up/down, CH up/down) are not effective.
PATTERN1: VOL up/down and CH up/down buttons on the unit are not effective
PATTERN2& PATTERN3: Same as PATTERN1
Note: All buttons on the remote control are effective in any KEY STOP OPERATION setting.
Pressing VOL Down button on the unit for setting Hotel mode is effective.
Change address 00EF from 00 to 80 in Memory Edit Mode.
Entry to the Serviceman Mode
Hold the “VOLUME DOWN” button inside the door of unit and
press the “RECALL” button on the remote control three times within 1 seconds.
Select main item OTP:
Press “1” or “2” button on the remote control.
Entry to the Memory Edit Mode / Some information indication
press the “MUTE” button on the remote control for more than 3 seconds in OPT menu.
Select ADDRESS “00EF”:
1. Press ”3” button on the remote control to change address.
Change DATA to “80”:
1. Press “VOLUME UP/DOWN” button to change data.
2. Press “6” button for 3 seconds to store the data.
TV unit go into Hotel Mode.
Exiting the Service Mode
Press “Power” button on the remote control or on the unit.
Posted By: FRANK at 06:25
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