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 !

Saturday 9 March 2019

PANASONIC PT-LC50U - PT-LC50E - PT-LC150 SERVICE MODE AND ADJUSTMENT

PANASONIC PT-LC50U - PT-LC50E - PT-LC150 SERVICE MODE AND ADJUSTMENT


PANASONIC PT-LC50U - PT-LC50E - PT-LC150 

LCD PROJECTOR 


SERVICE MODE LAMP RESET AND ADJUSTMENT  

How to initialize EEPROM IC
If EEPROM IC (IC2006) on Main C.B.A. are replaced: After replacing EEPROM IC (IC2006), be sure to perform each of following steps in the order presented.
1. Connect a jumper wire between TP2017 and TP2018 on Main C.B.A. for over 5 seconds to set to factory set mode. Then, remove the jumper wire.
2. “FACTORY” appears on screen.
3. Connect a jumper wire between TP2017 and TP2018 again for over 5 seconds to initialize EEPROM IC. Then, remove the jumper wire.
4. “SELF CHECK” appears on screen.
5. Remove jumper wires and “MEMORY OK” appears on screen.
6. After completing all adjustments, press the MENU button to memorize adjustment data in EEPROM IC and release from the Factory Adjust mode. Otherwise, adjustment data will be cancelled.
Lamp replacement procedure
Caution: Because of possibility of injury, strictly follow the replacement procedure below.
 1. After the cooling fan has stopped, and STANDBY(R) ON(G) indicator turns solid red, unplug the power cord.
Note: Wait more than one hour for lamp replacement.
The LCD Projector has a forced cooling feature. After the POWER switch is turned OFF, and sometime during about the first minute of the normal cooling fan operation, press MENU for 5 seconds. The cooling fan will change to high speed forabout 10 minutes.
2. Loosen 2 screws (A) using a screwdriver as shown.
3.Remove the Lamp Cover Unit.

4. Push the of the Lamp Hold Lever to release the Lamp
5. Carefully pull the Lamp Unit.

RESETTING THE LAMP HOUR TIMER
Press POWER and INPUT buttons together for about 5 seconds when lighting up red by POWER LED to reset lamp time.
Removal of the Filter Cover
1. Hold the indent on the Filter Cover and pull the Filter Cover with the Filter as shown

FACTORY ADJUST
All Electrical Adjustments are performed on the “FACTORY ADJUST” mode which is used remote control unit instead of variable resistor to control the adjustment value.
1. Connect a jumper wire between TP2017 and TP2018 on Main C.B.A. for over 5 seconds to enter the “FACTORY ADJUST” mode.
2. Press the POWER button once.
3. While "Please press POWER button again to power off." is displayed, press the MENU button.
4. Press UP or DOWN  button on remote control to select and press the ENTER button to
Do not adjust all items in “DIGITAL ADJUST”, and VIDEO BRIGHT in “VIDEO/RGB ADJUST, and GAMMA R, G, B in “LCD/FAN ADJUST”.
LCD VOLTAGE ADJUSTMENT
Purpose: To set the standard voltage for LCD panel.
Symptom of Misadjustment: LCD panel may be damaged.
1. Connect the DVM (Digital Volt Meter) to TP1904.
2. Press or button on the remote control to select “15.3V”.
3. Press LRFT or RIGHT  button so that the voltage shown in the display of DVM is 15.3 V ± 0.05 V DC.
RGB INPUT LEVEL ADJUSTMENT
Purpose: To set the optimum signal level.
Symptom of Misadjustment: The picture will be too light or too dark.
1. Supply Gray Scale Pattern Signal (3 scales).
2. Connect the oscilloscope to TP3501.
3. Press UP or DOWN button on remote control to select “R BRIGHT”.
4. Press LEFT or RIGHT button so that Black level becomes the same as OSD Black leve
5. Select “R LEVEL”, and press LEFT or RIGHT  button so that White level becomes the same as OSD White level.
6. Connect the oscilloscope to TP3502.
7. Press UP or DOWN button on remote control to select “G BRIGHT”
8. Press LEFT or RIGHT button so that Black level becomes the same as OSD Black level.
9. Select “G LEVEL”, and press LEFT or RIGHT button so that White level becomes the same as OSD White level.
10. Connect the oscilloscope to TP3503.
11. Press UP or DOWN button on remote control to select “B BRIGHT”.
12. Press LEFT or RIGHT button so that Black level becomes the same as OSD Black level.
13. Select “B LEVEL”, and press LEFT or RIGHT button so that White level becomes the same as OSD White level.
VIDEO INPUT ADJUSTMENT
Purpose: To set the optimum signal level.
Symptom of Misadjustment: The picture will be too light or too dark.
1. Supply Gray Scale Pattern Signal (3 scales).
2. Connect the oscilloscope to TP3502.
3. Press UP or DOWN or MENU button on remote control to select “VIDEO LEVEL”.
4. Press LEFT or RIGHT button so that the white level becomes the same as OSD white level.
COMPONENT VIDEO COLOR ADJUSTMENT
Purpose: To set the optimum signal level.
Symptom of Misadjustment: The picture will be too light or too dark
1. Supply Component Video 480P Blue 100 % Raster Signal.
2. Connect the oscilloscope to TP3503.
3. Press UP or DOWN button on remote control to select “YPBPR COLOR”.
4. Press LEFT or RIGHT button so that the Blue level becomes the same as OSD White level.
After completing adjustments, press the “MENU ” button to release from “VIDEO/RGB ADJUST” mode. (Adjustment data is memorized in EEPROM IC (IC2006) by pressing “MENU ” button.)Otherwise, adjustment data  will be cancelled.
LCD COMMON ADJUSTMENT
Purpose: To set the optimum LCD common voltage.
Symptom of Misadjustment: The picture will be bluish or reddish.
Note: This adjustment should be done in a darkroom.
1. Supply 70 % Red Horizontal Signal and project on the screen.
2. Press UP or DOWN button on remote control to select “VCOM R”.
3. Press LEFT or RIGHT button so that the flicker on the whole screen becomes minimal.
4. Supply 70 % Green Horizontal Signal and project on the screen.
5. Press UP or DOWN button on remote control to select “VCOM G”.
6. Press LEFT or RIGHT button so that the flicker on the whole screen becomes minimal.
7. Supply 70 % Blue Horizontal Signal and project on the screen.
8. Press UP or DOWN button remote control to select “VCOM B”.
9. Press LEFT or RIGHT button so that the flicker on the whole screen becomes minimal.
WHITE LEVEL ADJUSTMENT
Purpose: To set the optimum signal level.
Symptom of Misadjustment: The picture will be too light or too dark.
1. Supply Gray Scale Pattern Signal (3 scales).
2. Connect the oscilloscope to TP3505.
3. Press UP or DOWN button on remote control to select “WHITE LEVEL”.
4. Press LEFT or RIGHT button so that level A becomes 3.7 V ± 0.05 V [p-p].
BLACK LEVEL ADJUSTMENT
Purpose: To set the optimum signal level.
Symptom of Misadjustment: The picture will be too light or too dark.
This adjustment should be done in a darkroom.
1. Supply Green Level Adjustment Signal and project on the screen.
2. Press UP or DOWN button on remote control to select “BLACK LEVEL”.
3. Press LEFT or RIGHT button so that Portion (B) are invisible and Portion (A) are visible on the screen.
WHITE BALANCE ADJUSTMENT
Purpose: To set the standard white level for each color temperature.
Symptom of Misadjustment: White will become bluish or reddish.
This adjustment should be done in a darkroom.
1. Supply Gray Scale Pattern Signal (10 scales) and Project on the screen.
2. Press UP or DOWN button on remote control to select “CUTOFF R” or “CUTOFF B”.
3. Press LEFT or RIGHT button to adjust “CUTOFF R” or “CUTOFF B” so that the area around 4rdand 6th scale (A) becomes pure gray with no red or blue tint.  
Posted By: FRANK at 02:04
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