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........ . . . . . .....
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Monday 25 March 2019

NORCENT LT2722 SERVICE MODE WHITE BALANCE ADJUSTMENT SCALER ADJUSTMENT AND MORE

NORCENT LT2722 SERVICE MODE WHITE BALANCE ADJUSTMENT SCALER ADJUSTMENT AND MORE




TO ENTER SERVICE MODE [FACTORY MODE]
  • Press Number key 100 à 9 à 9 à 9 will into the factory mode, and OSD will be shown in the screen.
WHITE BALANCE ADJUSTMENT
Approximately 30 minutes should be allowed for warm up before proceeding white balance adjustment.
Before started adjust white balance,
  • Set the Chroma-7120 MEM. Channel 1 to 9300 color, MEM.Channel 2 to 6500 color, and MEM. Channel 3 to 9300 color, (9300 parameter is x =283, y = 297, Y = 380cd/m2 (PC Mode); 6500 parameter is x = 313, y = 329, Y = 380cd/m2 (PC Mode); 9300 parameter is x =283, y = 297, Y> 450cd/cm2 (TV Mode))
  • To set MEM.channel 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 adjust
  • ADC Adjustment:
  1. AL à Auto level adjust for PC mode.
  2. ALY à Auto level adjust for YUV mode.
  3. RG, GG, BG à R, G, B Gain adjust.
  4. RB, GB, BB à R, G, B Bias adjust.
  • SCALER Adjustment:
  1. CO, BR à Contrast and Brightness adjust.
  2. RG, GG, BG à R, G, B Gain adjust.
  3. RB, GB, BB à R, G, B Bias adjust.
  4. S9, S6, ST, SH à Save 9300, 6500, TV/AV /S-Video /480i, Component 480P color temperature.
  5. R9, R6, RT, RH à Recall 9300, 6500, TV/AV /S-Video /480i, Component 480P color temperature.
  6. CC à Set Close Caption ON/OFF.
  7. VC à Set V Chip ON/OFF.
  8. WH à Set Wireless Headphone ON/OFF.
  9. PP à Set PIP ON/OFF.
  10. BI à Setup Burn-in mode ON / OFF.
  11. ISP àSet ISP ON/OFF.
  12. SR PP à Set SRS ON/OFF.
  13. EX à Exit MORE function to factory mode menu.
Before adjustment:
  • Press Number key 100 à9 à9 à1 into Engineer Mode.
  • Press menu key repeat to “ADC “page, then select “EPinit” and press “right” key to initial EEPROM.
  • Press Number key 100 à 9 à 9 à 9 into the Factory Mode.
Gain adjustment:
  • Adjust 9300 color-temperature:
  1. Switch the chroma-7120 to RGB-mode (with press “MODE” button)
  2. Switch the MEM. Channel to Channel 01 (with up or down 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 up to G value at chroma-7120 is 100.
  7. Adjust the 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 “S9” and press “right” arrow to save the value.
  • Adjust 6500 color-temperature:
  1. Switch the chroma-7120 to RGB-mode (with press “MODE” button)
  2. Switch the MEM. Channel to Channel 02 (with up or down arrow on Chroma-7120)
  3. The LCD-indicator on chroma-7120 will show x = 313, y=329, Y>380.
  4. Change 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. Adjust the 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 chroma-7120 to RGB-mode (with press “MODE” button)
  2. Switch the MEM. Channel to Channel 03 (with up or down arrow on Chroma-7120)
  3. The LCD-indicator on chroma-7120 will show x = 283, y=297, Y>450.
  4. Change source input to AV1.
  5. Adjust the GG up to G value at chroma-7120 not going up; set the G value is max.
  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 value the same.
  8. Select cursor to “ST” and press “right” arrow to save the value.
  9. Turn the POWER-button off to on to quit from factory mode.

  • Auto Level of PC should be adjusted with TIMG 127, PATN 42 or 16 GRAYS screen.
  • It should be under white picture while adjusting the color temperature of all display modes.
Posted By: FRANK at 03:14
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