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 !

Friday, 8 March 2019

HOW TO ENTER TO SERVICE MODE PANASONIC TX-32LX70P - TX-26LX70F LED BLINKING CODE AND VOLTAGE ADJUSTMENTS

How to enter to service mode Panasonic TX-32LX70P - TX-26LX70F Led blinking code and voltage adjustments


Contents in this article 

  • Service mode ( Factory adjustment mode )
  • Causes of Standby led flashing 
  • Subcontrast adjustment 
  • White balance adjustment 
  • Voltages at the different part of circuit board 


PANASONIC TX-32LX70P - TX-26LX70F 

SERVICE MODE LED BLINKING CODE AND VOLTAGE ADJUSTMENTS 


Service Mode Function
MPU controls the functions switching for each IICs through IIC bus in this chassis. The following setting and adjustment can be adjusted by remote control in Service Menu.
How to enter to service mode 
While pressing (-/v) button on the TV unit, press on the remote control for 3 times within 2 seconds.
Note:
To exit from Service mode, press the exit button on remote control.
Key Command
# Press the 3/4 button to change the adjustment values or function.
# Press the 1/2 button to step up/down through the functions and adjustments
# Press the numerical button VOLUME (+/-) to change of each option item.
# Press the OK button after each adjustment has been made to store the required values.
Subcontrast adjustment
1. Receive PAL colour bar (100% white) RF signal.
2. Enter “Contrast” adj. In SERVICE mode.
3. Start adjusting by using Yellow Key.
4. If the adjustment finished normally, the letter of Contrast will change from red to black.
White Balance adjustment
1. Procedure basically performs checking using the production software and make automatic adjustment using external computer.
2. It adjusts in the mode of: Colour balance Normal Viewing Mode Dynamic

VOLTAGE ADJUSTMENTS 
AP board
Description
Test point
Position
Normal mode
Stand by mode
Sound_Vcc
TP7302
AP3, pin 2,3
15V +/- 0,8V
Max 5V
DTV_9V
TP7502
AP3, pin 17,18
9,1V +/- 0,45V
Max 3V
Sub_5V
TP7402
AP3, pin 21,22
5,1V +/- 0,25V
Max 2V
Main_9V

AP3, pin 23
9,1V +/- 0,45V
Max 3V
LCD_3.3V
TP7602
AP4, pin 16,17
3,3V +/- 0,16V
Max 2V
STB_5V
TP7103
AP4, pin 3
5,1V +/- 0,25V
5,1V +/- 0,25V
Panel 12V
TP7702
AP4, pin 11,12
12,2V +/- 0,6V
Max 4V

P board
Description
Test point
Position
Normal mode
Stand by mode
5Vs
TP823
P8, pin 1
5,1V +/- 0,25V
5,1V +/- 0,25V
24V
TP825
P5, pin 1-3
24V +/- 2V
Max 4V

DG board
Description
Test point
Normal mode
Sub1,2V
TP5601
1,17V - 1,32V
Sub1,8V
TP5602
1,7V - 1,9V
Sub3,3V
TP5600
3,14V - 3,46V
MHQ1,2V
TP4209
1,1V - 1,3V

Power LED blinking
When abnormality has occurred the unit, the protection circuit operates and reset to the stand by mode. At this time, the defective block can be identified by number of blinking of the Power LED on the front panel of the unit.
Blinking times
Contents
Check point
1
INVERTER_SOS
DG BOARD
LCD PANEL
2
FAN_SOS
H BOARD
DG BOARD
3
BT_30V,SOUND 15V
PANEL 12V, HQ_ 3.3V
H BOARD
AP BOARD,DG BOARD
4
DTV_9V
AP BOARD
H BOARD, DG BOARD
5
MAIN_9V
AP BOARD
H BOARD, DG BOARD
6
SUB_5V
AP BOARD
H BOARD, DG BOARD
7
MAIN_5V
DG BOARD
8
MAIN_3.3V
DG BOARD
9
SOUND_SOS
H BOARD
DG BOARD
10
HQ1L_SOS
DG BOARD
Posted By: FRANK at 00:59
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