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 !

Monday, 25 February 2019

AOC-NORCENT - LT2722 - ENTER SERVICE MODE AND ADJUSTMENTS


AOC-NORCENT - LT2722 - ENTER SERVICE MODE AND ADJUSTMENTS


ENTERING SERVICE MODE
  • To enter service mode, press key [100 => 9 => 9 => 9].  Factory mode window will be displayed.
  1. ADC Adjustment.
  • AL => Auto Level adjustment for PC mode.
  • ALY => Auto Level adjustment for YUV mode.
  • RG,GG,BG => R,G,B Gain adjustments.
  • RB,GB,BB => R,G,B Bias adjustments.
2.  SCALER Adjustment.
  • CO,BR => Contrast and Brightness adjustments.
  • RG,GG,BG => R,G,B Gain adjustments.
  • RB,GB,BB => R,G,B Bias adjustments.
  • S9,S6,ST,SH => Save 9300,6500, TV/AV, S -VIDEO/480i, Component 480P color temperature.
  • R9,R6,RT,RH => Recall 9300,6500, TV/AV, S-VIDEO/480i , Component 480P color temperature.
  • CC => set Closed Caption ON/OFF.
  • VC => Set V-Chip ON/OFF.
  • WH => Set Wireless Headphone ON/OFF.
  • PP => Set PIP On/OFF.
  • BI => Setup Burn-In Mode ON/OFF.
  • SR PP => Set SRS ON/OFF.
  • EX => Exit More Function to Factory Menu.
Before Adjustment.
  1. Press number key [100=>9=>9=>9=1] into Engineer Mode.
  2. Press Menu key repeat to ADC page, and then select "EPinit" and press Right Key to Initial EEPROM.
  3. Press key [100=>9=>9=>9] into the Factory mode.
Gain Adjustment

A -Adjust 9300 color-temperature.
  1. Switch the chroma-7120 to RGB mode, with pressing Mode button.
  2. Switch the MEM.  Channel to [01], with Up/Dn arrow on chroma-7120.
  3. The LCD indicator on chroma-7120 will show [x=283, y=297, Y>380].
  4. Change Source Input to PC.
  5. Select 'AL" and press Right arrow to do the auto-level.
  6. Adjust the GG upto G value at chroma 7120 is 100.
  7. Adjust BG and RG till the value of 'R' and 'B' value on chroma-7120 are 100+/- (5).
  8. Repeat items 4 and 5 to make R,G,B value are the same.
  9. Select Cursor to "S9" and press "right arrow"to save the value.
B -Adjust 6500 color temperature.
  • Do the same as above; with selecting MEM channel to [02].
  • Select cursor to "S6" and press "right arrow" to save the value.
C - Adjust Video Color Temperature.
  1. Switch the Chroma-7120 to RGB mode, by pressing Mode button.
  2. Switch the MEM.  Channel to Channel [03], with UP/Dn arrow on chroma.
  3. The LCD indicator on chroma-7120 will show [x=283, y=297, Y>450].
  4. Change source input to AV-1.
  5. Adjust the GG upto G value at chroma-7120 not going up; set the G value is maximum.
  6. Adjust the BG and RG till the value of R and B value on chroma-7120 same as G value.
  7. Repeat the item 4 and 5 to make the R,G,B values are the same. 
  8. Select cursor to "ST" and press "Right arrow" to save the value.
Turn the Power Button to 'OFF" to "Quit" from Factory mode.
Auto Level to PC should be adjusted with TIMG 127, PATN 42 or 16 GRAYS screen.  It should be under white picture while adjusting the color temperature o all display modes
Posted By: FRANK at 01:56
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