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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Tuesday 26 February 2019

HOW TO ADJUST AOC-LT 2722 NORCENT LCD TV SERVICE MODE PARENTAL LOCK AND UNLOCK PROCEDURE

HOW TO ADJUST AOC-LT 2722 'NORCENT' LCD TV SERVICE MODE PARENTAL LOCK and UNLOCK PROCEDURE


DID FORGET PASSWORD?

Chang the password; default password is; [1111], follow the instructions on screen.  If you have forgotten your password, do the following.

  • "POWER OFF => MENU => V-CHIP => MUTE" to revert the default password to (1111)
SERVICE MODE
There are two types of service mode to this set.

Engineer Mode & Factory Mode

Engineer Mode:
  • Press number key [100 => 9 => 9 => 1] to enter into Engineer Mode.
  • Press "Menu" key repeat to ADC page, and select "EPrint" and press 'Right' key to initial EEPROM.
  • Press number key [100 => 9 => 9 => 9] and enter into Factory Mode.
How to setting MEM channel, you can reference to Chroma-7120 user guide, or simple use"SC" key and "Next" key to modify x,y,Y value and use "ID" key to modify the TEXT description.

Following is the procedure to do white-balance adjustment.
  1. ADC Adjustment => [AL = Auto Level Adjustment, ALY = Auto Level Adjustment for YUV mode. RG,BG,GG => R,G,B gain adjustment.  RB,GB,BB = R,G,B Bias adjustment.]
  2. SCALER adjustment. [CO,BR => Contrast and Brightness adjustment.  RG,GG,BG => R,G,B gain adjustment.  RB,GB,BB => R,G,B Bias adjustment.  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.  VC => Set Close 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.  ISP => Set ISP ON/OFF.  SR PP => Set SRS On/OFF.  EX => EXIT MORE function to Factory Mode menu.
GAIN ADJUSTMENT

  • ADJUST 9300 COLOR TEMPERATURE
  1. Switch the chroma -7120 to RGB mode, by pressing "Mode" button.
  2. Switch the MEM. Channel to Channel 01, with Up or Dn arrow on chroma-7120.
  3. The LCD indicator on chroma-7120 will show [x=283, y=297, Y>380]
  4. Change the "Source" input to PC.
  5. Select "AL" and press "Right" arrow to do the Auto Level.
  6. Adjust the 'GG' up to G value at chroma-7120 is 100.
  7. Repeat the item 4 & 5 to make R,G,B value are the same.
  8. Select Cursor to "S9" and press "Right" arrow to save the value.
Turn Power Button OFF to quit from Factory Mode.
  • Auto Level of PC should be adjusted with TIMG 127, PATN 42or 16 GRAYS screen.
  • It should be under White Picture while adjusting the color temperature  of all display modes.
ADJUST 6500 COLOR TEMPERATURE
  1. Switch the Choroma-7120 to RGB mode, by pressing "Mode" button.
  2. Switch the MEM.  Channel to Chanel 02, with Up or Dn arrow on chorma-7120
  3. The LED indicator on chroma-7120 will show [x=313, y=329, Y>380].
  4. Change the source input to PC.
  5. Select "AL" and press 'right' arrow to do auto-level.
  6. Adjust GG up to G value at chroma-7120 is 100.
  7. Adjsut BG and RG till the value of R and B value on chroma-7120 are 100+/-5
  8. Repeat the item 4 and 5 to make the R,G,B value are the same.
  9. Select Cursor to "S6" and press 'right' arrow to save the value.
ADJUST VIDEO COLOR TEMPERATURE
  1. Switch the chorma-7120 toRGB mode, by pressing "Mode" nutton.
  2. Switch the MEM.  Channel to Channel 3, with Up or Dn arrow on chroma-7120.
  3. The LCD indicator on chroma-7120 will show [x=283,y=297, Y>450].
  4. Change 'source input' to [AV-1].
  5. Adjust GG up to G value at chroma-7120 not going up; set the g value is max.
  6. Adjust 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 value to same.
  8. Select cursor to "ST" and press 'right' arrow to save the value
Posted By: FRANK at 02:47
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