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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All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Wednesday, 6 February 2019

HP L1950 - HP L1750 - Monitor - How to enter service mode - adjustments - SMPS schematic

HP L1950 & L1750 - LCD Monitors - SMPS - Back-Light inverter - Scalar board Schematic - Service Mode Entry Procedure - adjustments AOC & HP Monitors
Factory mode (Service Mode) of HP L1710 and HP1950
Turn on power, press the Menu button, pull out the power cord, and then plug the power cord. Then the factory OSD will be at the left top of the panel.
Press reset key and Turn the Power-button “off to on” to quit from factory mode.
White- Balance, Luminance Adjustment
Approximately 30 minutes should be allowed for warm up before proceeding White-Balance adjustment.
1. How to do the Chroma-7120 MEM .Channel setting
A. Reference to chroma 7120 user guide
B. Use “ SC” key and “ NEXT” key to modify xyY value and use “ID” key to modify the TEXT description Following is the procedure to do white-balance adjust
2. Setting the color temp. You want
A. 9300k color:
9300 color temp. parameter is x = 283 ±15, y = 297 ±15, Y> 190 cd/m2 ,
B. sRGB color:
sRGB color temp. parameter is x = 313±15, y = 329 ±15, Y>200 cd/m2)
C. 6500K color:
6500K color temp. parameter is x = 313±15, y = 329 ±15, Y>230 cd/m2)
3. Into factory mode of HP L1710
Turn on power, press the Menu button, pull out the power cord, and then plug the power cord. Then the factory OSD will be at the left top of the panel.
4. Bias adjustment
Set the Contrast to 80
Adjust the Brightness to 90.
5. Gain adjustment
Move cursor to “-F-” and press MENU key
A. Adjust 9300k color-temperature
1. Switch the Chroma-7120 to 9300k channel.
2. The chroma 7120 will show x = 283±15, y = 297 ±15, Y>190 cd/m2
3. Switch the chroma-720 to RGB MODE (with press “MODE” button to change )
4. Adjust the RED of color 9300K on factory window until chroma 7120 indicator reached the value R=100
5. Adjust the GREEN of color 9300K on factory window until chroma 7120 indicator reached the value G=100
6. Adjust the BLUE of color 9300K on factory window until chroma 7120 indicator reached the value B=100
7. Repeat above procedure ( item 4,5,6) until chroma 7120 RGB value meet the tolerance =100±2
SMPS and Back-light inverter Schematic
Power board 715G2655
Back-light inverter 
Scalar 715G2559
B. Adjust sRGB color-temperature
1. Switch the chroma-7120 to sRGB channel.
2. The chroma 7120 will show x = 313 ±15, y = 329 ±15, Y >200 cd/m2
3. Switch the chroma 7120 l to RGB MODE ( with press “MODE” button to change )
4. Adjust the RED of color sRGB on factory window until chroma 7120 indicator reached the value R=100
5. Adjust the GREEN of color sRGB on factory window until chroma 7120 indicator reached the value G=100
6. Adjust the BLUE of color sRGB on factory window until chroma 7120 indicator reached the value B=100
7. Repeat above procedure ( item 4,5,6) until chroma 7120 RGB value meet the tolerance =100±2
C. Adjust 6500k color-temperature
1. Switch the chroma-7120 to 6500K channel.
2. The chroma 7120 will show x = 313 ±15, y = 329 ±15, Y >230 cd/m2
3. Switch the chroma 7120 l to RGB MODE ( with press “MODE” button to change )
4. Adjust the RED of color sRGB on factory window until chroma 7120 indicator reached the value R=100
5. Adjust the GREEN of color sRGB on factory window until chroma 7120 indicator reached the value G=100
6. Adjust the BLUE of color sRGB on factory window until chroma 7120 indicator reached the value B=100
7. Repeat above procedure ( item 4,5,6) until chroma 7120 RGB value meet the tolerance =100±2
D. Press reset key and Turn the Power-button “off to on” to quit from factory mode.
Posted By: FRANK at 07:56
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