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 !

Thursday, 28 March 2019

NORCENT AND AOC - LT2725 LCD TV - SERVICE MODE

NORCENT and AOC - LT2725 LCD TV - SERVICE MODE -


How to enter Service mode [Factory Mode] to AOC LT2725 and Norcent LT2725 LCD TV - SMPS and Audio Output Schematics - Adjustments - Password reset - Parental Control Adjustments.
Used ICs: TC2001 - TP2050 – HJM2199 – STR-A6252 – SI-8120 – FP130
To set or change the password
Enter the old password and then enter the new password.
Confirm new password.
The default password is: 0000

Parental control
Before enter the parental control menu, key in the password first.  The user can set the restricted table about MPAA or TV rating separately.
The default password is: 0000
Press the EXIT button to exit from this adjustment mode.   



Factory mode [Service Mode]
In the TV mode adjust volume to zero and press number key 9  8  7  6.
It will achieve the factory mode. Select the item of White Balance and press right key to enter it.
White balance adjustment
In the White Balance you can adjust 8 items.
1-3 items is RO, GO, BO > R, G, B Bias adjust.
4-6 items is RG, GG, BG > R, G, B Gain adjust.
7 item needn't adjust
8 items is Bias (Low luminance) adjustment:
1. Set the raster pattern (Black pattern with 1024×768) Input.
2. Adjust the brightness on OSD until chroma 7120 measurement reach the lowest value. colour temperature select: Cool, Normal, and Warm.
Gain adjustment
A. Adjust Cold colour-temperature:
1. Set the Contrast of OSD function to 80 and Adjust Brightness to chroma-7120 Y>350 cd/m2
2. Switch the chroma-7120 to RGB-mode (with press “MODE” button)
3. Switch the MEM. channel to Channel 01 (with up or down arrow on chroma-7120)
4. The LCD-indicator on chroma-7120 will show x =291, y =306, Y>350cd/m2
5. Adjust the 4 item: RG, until chroma 7120 indicator reached the value R=100
6. Adjust the 5 item: GG, until chroma-7120 indicator reached the value G=100
7. Adjust the 6 item: BG, until chroma-7120 indicator reached the value B=100
8. Repeat above procedure until chroma-7120 RGB value meet the tolerance =100±2
9. Switch the chroma-7120 to x, y, Y mode with press “MODE” button to check the colour temp is in SPEC. or not.
10. Enter the 8 item to select another colour temperature to adjust.
B. Adjust Normal colour-temperature
1. Set the Contrast of OSD function to 80 and Adjust Brightness to chroma-7120 Y>350cd/m2
2. Switch the chroma-7120 to RGB-mode (with press “MODE” button)
3. Switch the MEM. channel to Channel 03 (with up or down arrow on chroma-7120)
4. The LCD-indicator on chroma-7120 will show x =299, y =315, Y>350cd/m2
5. Adjust the 4 item: RG, until chroma 7120 indicator reached the value R=100
6. Adjust the 5 item: GG, until chroma-7120 indicator reached the value G=100
7. Adjust the 6 item: BG, until chroma-7120 indicator reached the value B=100
8. Repeat above procedure until chroma-7120 RGB value meet the tolerance =100±2
9. Switch the chroma-7120 to x, y, Y mode With press “MODE” button to check the colour temp is in SPEC. or not.
10. Enter the 8 item to select another color temperature to adjust.
C. Adjust Warm colour-temperature
1. Set the Contrast of OSD function to 80 and Adjust Brightness to chroma-7120 Y>350cd/m2
2. Switch the chroma-7120 to RGB-mode (with press “MODE” button)
3. Switch the MEM. channel to Channel 04 (with up or down arrow on chroma-7120)
4. The LCD-indicator on chroma-7120 will show x =308, y =324, Y>350cd/m2
5. Adjust the 4 item: RG, until chroma 7120 indicator reached the value R=100
6. Adjust the 5 item: GG, until chroma-7120 indicator reached the value G=100
7. Adjust the 6 item: BG, until chroma-7120 indicator reached the value B=100
8. Repeat above procedure until chroma-7120 RGB value meet the tolerance =100±2
9. Switch the chroma-7120 to x, y, Y mode With press “MODE” button to check the colour temp is in SPEC. or not.
10. Enter the 8 item to select another colour temperature to adjust.
Switch different source
Press the source key on the remote control to switch different source to adjust the AV, HDMI, CONPONENT 480i
and COMPONENT 480p mode.
Press “Exit” button on remote control to quit from factory mode.
Posted By: FRANK at 03:32
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