Master Electronics Repair !

Welcome to Master Electronics Repair! website.Here you will find:Service Modes, Circuit Diagrams,Service manuals, Firmware Update procedure, Disassemble procedure, Universal remote control setup codes, Troubleshooting, Diagnosing, Measuring, and more.... of many of LCD/LED TV/Displays,others various electronic apparates,trough many technical notes and tips/tricks to help repairing/fixing Troubles/ faults,for electrical technicians.This site helps you to save the Earth from electronic waste!

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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Note that if you don't find what you searched for, try it after a period of time; the site is a never ending job !

..............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 !

Monday, 2 March 2020

HAIER LET19C430 LED TV CHASSIS MSD306 - SOFTWARE UPDATE DISASSEMBLE PROCEDURE – HOW TO ENTER THE SERVICE MODE - TROUBLESHOOTING

J2-Pin 3: Back-light on/off: The system can turn on or turn off the backlight of TFT LED Panel through the power supply unit path. J2-Pin 5: System power on / standby System board will use this pin to control system power. J2-Pin 2: Control the luminance of back-light The system can generate the PWN signal to control the strength of TFT LED Panel’s backlight through this connector.

Power Board voltage details

Display the signal Functions

How to disassemble the TV

Remove the Pedestal

Remove the Back Cover

Remove the adhesive tape

Remove the adhesive tape indicated on the figure above.

Remove the front frame on the figure above.

Remove the Terminal Bracket

Remove the power module and then Remove the Main board

Remove the speaker

Take out the speaker.

Remove the remote control sensor board. Remove the screw, take out the remote control sensor board.

This TV provides one group of AV ,one group of YPbPr and one SCART for convenient connection to VCR,DVD or other video equipment.

When the source device(DVD player or Set Top Box) supports HDM

can be connected to the following appliances: VCR, multi disc player, DVD, camcorder, video game or stereo system, etc.....
YPbPr can support these video formats:480i,576i,480p,576p,720p,1080i.

If the source device supports Auto HDMI function, the output resolution of the source device will be automatically set to 1280x720p.
If the source device does not support Auto HDMI, you need to set the output resolution appropriately.
To get the best picture quality, adjust the output resolution of the source device to 1280x720p.
Select HDMI input source in input source option of Select Main source menu.

When the source device(DVD player or Set Top Box) supports DVI

Connect the source device to HDMI port of this TV with a HDMI-to-DVI cable(not supplied with this product).
2. A separated audio connection is necessary.
3. If the source device has an analog audio output connector, connect the source device audio output to DVI Audio In port located on the PC port.

If the source device supports Auto DVI function, the output resolution of the source device will be automatically set to 1280x720p.
If the source device does not support Auto DVI, you need to set the output resolution appropriately.
To get the best picture quality, adjust the output resolution of the source device to 1280x720p.
Press the INPUT button to select HDMI input source in input source option of Select Main source menu.

1.SOURCE Display the input source menu.
2.MENUDisplay main MENU.
3.CH+/CH-:In TV mode press“CH+”or“CH-”to change the channel up and down.In MENU mode, press “CH+”or“CH-”to select items .In standby mode, press“CH+”or“CH-”to turn on the TV.
4.VOL+/VOL-:Adjust sound level.In MENU mode, press“VOL+”or“VOL-”to adjust the item that you selected.
5. STANDBY : Press this button to turn the unit ON from STANDBY mode. Press it again to turn the set back to STANDBY.

Setting up the Remote Control

OPTION MENU

The fifth item of the MENU is the OPTION MENU. You can adjust the Menu language, Audio language,Subtitle language etc.

Restore factory default will clear all the programs and password.

LOCK MENU

The sixth item of the menu is the LOCK MENU You can lock system, set password, block program and set parental guidance Once you set the lock system to on, you can not search the channels or change any programs.

The default pass word is 6666.
Block program: Press UP/DN to choose the program ,press teletext green button to block the program. If you want unblock the program, enter the main menu , input the password, then press green button again.Parental guidance: Press Left/Right to choose rating.

How to enter into the factory mode [Service Mode]

Press the "source-2-5-8-0" to go into factory setting. Press the key "exit" to exit the factory setting.

Factory mode content

1: ADC setup: set ADC value of YUV,VGA. It can also be auto-set. Adopt 100% color bar to yuv and Checkerboard signal to vga.
2: Adjust the brightness and contrast ratio of each signal, which do not affect the value of user's menu.
3: adjust the color temperature and white balance of each signal source.
4: SSC to adjust the spectrum for passing the EMC test.
5: special set
1) 2hour off-- for Aging test
2) WDT --watch dog
3) White pattern --set pure color output for the panel, used at the checking and aging test for panel.
4) reset
5) set the recorder
6) set power-on screen display.
6: QMAP adjust :adjust color quality.
7: PEQ set sound EQ
8: sw information: to check the sofeware information
9: UART DEBUG : Access to serial port and connect a computer if set to HK.
10: BMTEST :cpu check the CPU
The last line is SW Ver.No.

How to update software

Haier MSD306 F/W upgrade with USB SOP
Step 1: Ready for F/W Upgrade
1.1 Prepare a USB memory .
1.2 Copy the software file [merg.bin] from your computer to the USB memory, and remove it from the computer USB port.

Step-2 F/W update

2.1 AC ON

2.2, then input USB , press "MENU" and choose "update software", and then press "OK"

2.3, Now you should choose "Yes",TV begin to update.You should reset TV after update.

[When Upgrade on the process, please don’t Power-Off]

Power Board voltages