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 !

Tuesday, 5 February 2019

MAGNAVOX 50MF412B-F7 AND LC501EM3 EMERSON – LCD TVS SERVICE MODE – FIRMWARE UPDATE – SMPS SCHEMATIC

50MF412B-F7 MAGNAVOX and LC501EM3 EMERSON – LCD TVs Service mode – firmware update – SMPS schematic

Emerson and Magnavox 50 inch televisions – service mode – power supply circuit diagram – initialization and software update procedure
HOW TO INITIALIZE THE LCD TV
The purpose of initialization is to place the set in a new out of box condition. The customer will be prompted to select a language and program channels after the set has been initialized.
To put the program back at the factory-default, initialize the LCD TV using the following procedure.
NOTE: Disconnect any device from the USB Port before you conduct on this procedure.
1. Turn the power on.
2. Enter the service mode.
- To cancel the service mode, press [POWER] button on the remote control unit.
3. Press [BACK] button to enter the Panel Key Confirmation Menu.
4. Press any button on the touch sensor panel.
5. Press [INFO] button to proceed with the self check mode.
6. Make sure to confirm the “INITIALIZED FINISH” appears in the green screen.
7. Unplug the AC Cord and plug it back on again.
How to set up the service mode:
Service mode:
1. Turn the power on.
2. Press [MENU] button to display Setup menu.
3. Select “Features”.
4. Select “Software Upgrade”.
5. Select “Current Software Info”.
6. Press [0], [4], [2], [5], [7], [4] and [INFO] buttons on the remote control unit in this order. The following screen appears.
SMPS schematic & PWB
FIRMWARE RENEWAL MODE
Equipment Required
a. USB storage device
b. Remote Control Unit
Firmware Update Procedure
User Upgrade (Filename example: TVNB012_00_UF_XX91_AA.ecc)
Upgrade the firmware only. The setting values will not be initialized.
The User Upgrade and the Firmware Upgrade (Factory Upgrade) will be done by the same file. If you want to upgrade the firmware and initialize the setting values also, add “FACT_” at the beginning of the filename.
If you want to upgrade the firmware only and leave the setting values as they are, eliminate the “FACT_” from the filename.
Update procedure
1. Turn the power on.
2. Press [MENU] button to display Menu.
3. Select “Features”.
4. Select “Software Upgrade”.
5. Select “Upgrade” to display Upgrade screen.
6. Press [OK] button to display Software Upgrade screen.
7. Select “USB” and press [OK] button.
8. Insert the USB storage device to the USB port.
9. Select “Check” and press [OK] button.
10. Select “Upgrade” and press [OK] button to start software upgrade.
11. The update will start and the following will appear in the screen.
If the above screen isn’t displayed, repeat from step 1.
Factory Upgrade (Firmware Upgrade/Flash Upgrade)
Firmware Upgrade (Filename example: FACT_TVNB012_00_UF_XX91_AA.ecc)
Upgrade the firmware and initialize the setting values.
The User Upgrade and the Firmware Upgrade (Factory Upgrade) will be done by the same file. If you want to upgrade the firmware and initialize the setting values also, add “FACT_” at the beginning of the filename.
If you want to upgrade the firmware only and leave the setting values as they are, eliminate the “FACT_” from the filename.
Flash Upgrade (Filename example: ALL_TVNB012_00_UF_XX91_AA.ecc)
Upgrade the firmware and initialize the setting values along with the factory default such as White Balance, etc.
Before the upgrade, you will need to make a note of all the factory default so you will be able to set it back on the TV after the initialization.
The Flash Upgrade will be done by it's unique file.
The User Upgrade/Firmware Upgrade (Factory Upgrade) file cannot be used for this upgrade.
Update procedure
1. Turn the power off.
2. Insert the USB storage device to the USB port.
3. Turn the power on.
4. The update will start and the status will appear in the screen.
[If the status screen isn’t displayed, repeat from step 1]
5. When the firmware update is completed, the status will appear in the screen.
Remove the USB storage device from the USB port.
Turn the power off and turn the power on again.
Service mode initial screen with a word “INITIALIZED” will appear in the screen. The color of the word “INITIALIZED” will change from red to green when initialization is completed.
Smps schematic
Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit.  If Main Fuse (F601) is blown , check to see that all components in the power supply circuit are not defective before you connect the AC plug to the AC power supply.  Otherwise it may cause some components in the power supply circuit to fail
Posted By: FRANK at 02:36
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