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

Thursday 31 January 2019

SYLVANIA 6620LDF – LCD TV-DVD COMBO – SERVICE MODE ADJUSTMENTS, FIRMWARE RENEWAL, INITIALIZATION, SMPS SCHEMATIC AND MORE

Sylvania 6620LDF – LCD TV-DVD combo – service mode adjustments, firmware renewal, initialization, SMPS schematic and more

How to set up the service mode

1. Use the service remote control unit.
2. Turn the power on. (Use main power on the TV unit.)
3. Press [DISC MENU] button on the service remote control unit. Version of micro computer will be displayed on the LCD or display. (Ex: A95FP-0.23)

How to make Service remote control unit

Prepare normal remote control unit (Part No. NE240UD). Remove 3 screws from the back lid.

Cut off pin 10 of the remote control.

microprocessor and short circuit pins 10 and 17 with a jumper wire.

Initial Setting
General: Enter the Service mode. Set the each initial data as shown on table below

Flicker Adjustment
1. Enter the Service mode.
2. Press [2] button on the remote control unit. The following screen appears.

If Flicker Adjustment is not fit, the screen becomes the following.

Press [CH. UP / DN] buttons on the remote control unit so that flash stops.

White Balance Adjustment
Purpose: To mix red, green and blue beams correctly for pure white.
Symptom of Misadjustment: White becomes bluish or reddish.

Use the remote control unit.
1. Operate the unit for more than 20 minutes.
2. Input the White Purity (APL 80%).
3. Set the color analyzer to the CHROMA mode and bring the optical receptor to the center on the LCD-Panel surface after zero point calibration as shown.

Note: The optical receptor must be set perpendicular to the LCD Panel surface.
[RF/VIDEO1]
Enter the Service mode.

Press “VOL DN” button on the remote control unit and select “C/D1-” mode.
[VIDEO2]
Enter the Service mode.

Press “VOL DN” button on the remote control unit and select “C/D2-” mode.

[RF/VIDEO1]

When “x” value and “y” value are not within specification, adjust “DB (C/D1)” or “DR (C/D1)”.
Refer to “1. Initial Setting.”
Note: “DB(C/D1)” or “DR(C/D1)” must be adjusted within ±0.01.
[VIDEO2]
When “x” value and “y” value are not within specification, adjust “DB(C/D2)” or “DR(C/D2)”.
Refer to Initial Setting.”
Note: “C-DB(C/D2)” or “C-DR(C/D2)” must be adjusted within ±0.01.
Turn the power off and on again. (Main power button on the TV unit.)

To initialize the lCD TV/DVD

To put the program back at the factory-default, initialize the LCD TV/DVD as the following procedure

DVD Section
1. Press [1], [2], [3], [4], and [DISPLAY] buttons on the remote control unit in that order.

Press [CLEAR] button on the remote control unit.

When “OK” appears on the screen, the factory default will be set.
3. To exit this mode, press [CH. UP/DN] or [SELECT] button to go to TV mode, or press [POWER] button to turn the power off.

LCD TV Section
1. Turn the power on. (Use main power on the TV unit.)
2. To enter the service mode, press [DISC MENU] button on the service remote control unit.
- To cancel the service mode, press [POWER] button on the remote control.
3. To initialize the LCD television, press [DISPLAY] button on the remote control unit.
4. Confirm "FF" indication on the upper right of the screen.
5. Unplug the AC cord.

Firmware renewal

1. Turn the power on and press [EJECT] button on the remote control unit to put the LCD TV/DVD into DVD mode. Then remove the disc.
2. To put the LCD TV/DVD into F/W version up mode, press [9], [8], [7], [6], and [SEARCH MODE] buttons on the remote control unit in that order.
Firmware update screen appears.

3. Insert the disc for version up into the disc slot.
4. The LCD TV/DVD enters the F/W version up mode automatically.

If you enter the F/W for different models, “Disc Error” will appear on the screen, then the disc will be ejected automatically.

5. After programming is finished, the disc will be ejected automatically, and the checksum will be shown.

At this time, no button is available.

6. Remove the disc.
7. Press [CH. UP/DN] button on the unit to go to TV mode, or press [POWER] button on the unit to turn the power off.
8. Press [EJECT] button on the remote control unit to put the LCD TV/DVD into DVD mode again.
9. Press [1], [2], [3], [4], and [DISPLAY] buttons on the remote control unit in that order.

10.Press [CLEAR] button on the remote control unit.

When “OK” appears on the screen, the factory default will be set. Then the firmware renewal mode is complete.
11.To exit this mode, press [CH.UP/DN] or [SELECT] button to go to TV mode, or press [POWER] button to turn the power off.

Voltage indications for PLAY and STOP modes on the schematics are as shown

How to Eject Manually
1. Remove the Rear Cabinet.
2. To remove the Loader PCB Holder with the DVD Main CBA Unit, remove three screws.
Do not disconnect connectors.
3. To remove the Chassis Cover, remove 4 screws A as shown in Fig.
4. Remove a disc.