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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You can even visit all posts, time to time, when reaching the bottom end of each page and click on the Older Post button.

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- The search this blog feature provided by Google is a real search engine. If you're pointing particular things it will search IT for you; or you can place a brand name in the search query at your choice and visit all results page by page. It's useful since the content of the site is very large.

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!

©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 !

Thursday, 7 March 2019

VIEWSONIC N2751W-1 HOW TO ENTER TO SERVICE MODE AND ADJUSTMENTS

Viewsonic N2751w-1 How to enter to service mode and adjustments

Contents of this article

How to enter service mode
Adjustment after board replacement
How to initialize the TV

Viewsonic N2751w-1

Function Test
Product
27” LCD TV
Test Equipment
PC signal generator: CHROMA 2525 CARD ,CHROMA 2327 or 2329,Pioneer DV-S969AVi.
TV and Video signal generator.
Color analyzer: MINOLTA CA110.
Power meter: CP-310A or CP-320A.
AC power supply transformer: 110V/120V ±20% 60Hz ±5%.
Digital ammeter
Test Condition
Before function test and alignment, each LCD TV should be run-in and warmed up for at least 30 minutes with the following conditions:
(a) In room temperature,
(b) With full-white screen, and 16 grey scale,
(c) With cycled display modes.

Test Display Modes & Pattern

EEPROM INIT
A. Timing: 1366*768@60Hz
B. Pattern: 16*12 pane
C. Press ’POWER’, UP and ‘ENTER’ at the same time, then go into the FACTORY MODE.

D. Figure 1,Select EEPROM INITIAL and press ENTER. The act of EEPROM INITIAL is completed when EEPROM INIT disappeared.
COLOR TEMPERATURE ADJUSTING PC MODE:
A. Timing: 1360*768@60Hz.
B. Pattern: 16 grey scale.
C. LCD TV should be run-in and warmed up for at least 30 minutes.
D. Make sure the distance between SENOR of the CA110 and the LCD TV is about 20cm.
E. Color Temperature adjusting.

After adjusting, switch to FULL WHITE and check the value of each color. Preset color for N2751W
x=0.283±0.015, y=0.298±0.015
Under the picture NTSC color bar of YPbPr source, select WHITE BALANCE and press ENTER, The color warm will auto adjust. The act of EHITE BALANCEL is completed when EHITE BALANCEL disappeared.
After adjusting, switch to FULL WHITE and check the value of each color.

Preset color for N2751W
x=0.283±0.015 ,y=0.298±0.015

VGA DDC Key In Procedure
Note:
1. Every time after replacing the main board, you have to do the DDC key in.
2. If you find the DDC does not conform to the LCD TV, you have to do the DDC key in.
Equipment Needed
N2751W LCD TV
DDC Card
PC
RS-232 cable
Barcode Reader
VGA Cable

Setup Procedure
1. Connect VGA Card and DDC Card with RS-232 cable.

2.Barcode Reader connects with keyboard and PC keyboard port.

3. Connect DDC Card and N2751W LCD TV with VGA Cable.
(When key in DVI DDC information, use VGA transform to DVI port.)
4. Connect Power Cord to N2751W LCD TV.

DDC Key In Procedure
1.Run DDC.exe
2.Choose model number and conform the Time then Press “ENTER” key.

3.When appear the PIC “ choose DDC Card”, Press ALT+2 Enter DDC 2B test interface.

4. Press F8 to choose corresponding model. DAT (N2751W-A.DAT press “ENTER” key)

5.Press F9 enter the download interface

6.Key in the serial number or use the barcode reader to scan the barcode of the LCD TV, and press “ENTER” key.

7.The successful picture is as follows. “Compare EDID:OK! Press any key to continue”.

HDMI DDC Key In Procedure
Equipment Needed
N2751W LCD TV
PC
RS-232 cable
Barcode Reader
HDMI Cable

Setup Procedure
1.Connect HDMI Card and DDC Card with RS-232 cable.

2.Barcode Reader connects with keyboard and PC keyboard port.

3. Connect DDC Card and N2751W LCD TV with HDMI Cable.
4. Connect Power Cord to N2751W LCD TV.

DDC Key In Procedure
1.Run DDC.exe

2. Choose model number then

3. Press “ENTER” key.

4. Input barcode

5. Press “ENTER” key, then the successful picture is as follows. “DDC DOWNLOED OK

6. Exit program.

How to enter to Service mode

Press POWER,UP and ‘ENTER’ at the same time, then go into the FACTORY MODE.