Wednesday, November 25, 2015

SHARP LC-26P50E - LC-32P50E -LC-37P50E SERVICE MODE POWER SUPPLY CIRCUIT AND INVERTER CIRCUIT

SHARP LC-26P50E - LC-32P50E -LC-37P50

SERVICE MODE POWER SUPPLY CIRCUIT AND INVERTER CIRCUIT  

Entering and exiting the adjustment process mode
(1) Unplug the AC power cord of running TV set to force off the power.
(2) While holding down the "VOL (–)" and "INPUT" keys on the set at once, plug in the AC power cord to turn on the power. The letter K appears on the screen.
(3) Next, hold down the "VOL (–)" and "P (DOWN)" keys on the set at once. Multiple lines of blue characters appearing onscreen indicate that the set is now in the adjustment process mode. If you fail to enter the adjustment process mode (the display is the same as normal startup), retry the procedure.
(4) To exit the adjustment process mode after the adjustment is done, unplug the AC power cord to force off the power. (When the power is turned off with the remote controller, once unplug the AC power cord and plug it in again. In this case, wait 10 seconds or so before plugging.)
Caution: Use due care in handling the information described here lest the users should know how to enter the adjustment process mode. If the settings are tampered with in this mode, unrecoverable system damage may result.
Adjustment of white balance
When the LCD panel or LCD control PWB has been replaced, the white balance may get out of spec. If it is too much out of spec, take this adjustment.
(1) Preparations
1) Have a white balance measuring instrument [Minolta CA-210] at hand. Place a luminance meter at the center of the screen.
2) Turn on the TV power and get the set in the following conditions.
AV mode: [DYNAMIC], Monochrome: [ON], Black: [OFF]
The signal is not particularly specified.
(2) Adjustment procedure
1) Enter the adjustment process mode, referring to "3. Entering and exiting the adjustment process mode."
2) Using the cursor (UP/DOWN) keys, select Adjustment Process Pages 10/12/ and 11/12.
3) Using the program (ù/Ù) keys, move the cursor to MGAMMA R/G/B.
4) Set the cursor to MGAMMA G6 to have the specified gradation "448" at Point 6. The luminance meter shows the x and y status values. Using the cursor (LEFT/RIGHT) and VOL (+/–) keys, obtain the standard values of Point 6: x = 0.272 and y = 0.277. Now jot down the G adjustment value of Point 6 ("A"). Do the same for MGAMMA R6 and MGAMMA B6.
5) Move the cursor to Point 1 (MGAMMA R1/G1/B1) to have the specified gradation "96" at Point 1.
The G initial value "B1" of Point 1 is displayed. Make the following calculation.
(G initial value "B1" of Point 1) x [(G adjustment value "A" of Point 6) / (Gradation "96" of Point 1)] = C1
Adjust the keys so that the C1 value becomes the G setting of Point 1. For the R and B values of Point 1, adjust the MGAMMA R1 and B1 values, respectively, to the Point 1 standard ones.
6) Take the same steps as in 5) for the following.
1. Set Point 2 to the specified gradation "136".
Multiply the G initial value "B2" of Point 2 by ["A" / Gradation "136" of Point 2] to have the G setting
C2 of Point 2. Adjust the MGAMMA R2 and B2 values, respectively, to the Point standard ones.
2. Set Point 3 to the specified gradation "248".
Multiply the G initial value "B3" of Point 3 by ["A" / Gradation "248" of Point 3] to have the G setting
C3 of Point 3. Adjust the MGAMMA R3 and B3 values, respectively, to the Point 3 standard ones.
3. Set Point 4 to the specified gradation "324".
Multiply the G initial value "B4" of Point 4 by ["A" / Gradation "324" of Point 4] to have the G setting
C4 of Point 4. Adjust the MGAMMA R4 and B4 values, respectively, to the Point 4 standard ones.
4. Set Point 5 to the specified gradation "396".
Multiply the G initial value "B5" of Point 5 by ["A" / Gradation "396" of Point 5] to have the G setting
C5 of Point 5. Adjust the MGAMMA R5 and B5 values, respectively, to the Point 5 standard ones.
5. Set Point 6 to the specified gradation "448".
Multiply the G initial value "B6" of Point 6 by ["A" / Gradation "448" of Point 6] to have the G setting
C6 of Point 6. Adjust the MGAMMA R6 and B6 values, respectively, to the Point 6 standard ones.
[White balance adjustment standard values]
Point 1 standard values: x = 0.272, y = 0.277 (gradation 96)
Point 2 standard values: x = 0.272, y = 0.277 (gradation 136)
Point 3 standard values: x = 0.272, y = 0.277 (gradation 248)
Point 4 standard values: x = 0.272, y = 0.277 (gradation 324)
Point 5 standard values: x = 0.272, y = 0.277 (gradation 396)
Point 6 standard values: x = 0.272, y = 0.277 (gradation 448)
Factory settings
Enter the adjustment process mode.
» Bring the cursor on to [INDUSTRY INIT] on page 2/12.
» Using the VOL (+/–) keys, set to [ON]. Press the OK key to execute the
initialization. The /////// pattern appears, and the adjustment process
mode is automatically replaced by the TV screen. Now the initialization is
complete.
` Never turn off the power during the initialization process.
Display adjustment procedure
Procedural steps
Enter the display process mode. Adjust the common bias.
Entering and exiting the display process mode
(1)While holding down the "VOL (+)" and "P (DOWN)" keys at once, plug in the AC power cord to turn on the power. The letter [K] appears on the screen.
(2) Next use the remote controller keys (VOL (+/–) or P (Ù/ù). Multiple lines of red characters appearing on the screen indicate that the set is now in the display process mode. When you fail to enter this mode (the display is the same as normal startup), retry the procedure.
(3) To exit the display process mode after the adjustment is done, unplug the AC power cord to force off the power. (When the power is turned off with the remote controller, once unplug the AC power cord and plug it in again.)
Common bias adjustment
Using the cursor (UP/DOWN) keys, move the cursor to "COM BIAS" on the display process service page. With the cursor (LEFT/RIGHT) keys, select the setting. Now use the cursor (UP/DOWN) again to vary the setting, and the test pattern appears onscreen. Make adjustment to minimize the flicker around the center of the screen.
Lamp error detection
(1) Function
This LCD color TV set incorporates a lamp error detection feature that automatically turns off the power for safety under abnormal lamp or lamp circuit conditions. If by any chance anything is wrong with the lamp or lamp circuit or if the lamp error detection feature is activated for some reason, the following will result.
1. The power is interrupted in about six seconds after it is turned on.
(The power LED on the front of the TV set turns red from green and keeps blinking in red: ON for 250 ms and OFF for 1 sec).
2. If the above phenomenon 1 occurs five times consecutively, it becomes impossible to turn on the power. (The power LED keeps blinking in red: ON for 250 ms and OFF for 1 sec).
(2) Measures
1. Checking with lamp error detection OFF
Enter the display process mode, referring to "10-2. Entering and exiting the display process mode." If there is a problem with the lamp or lamp circuit, the lamp will go out. (The power LED is green.) Then, you can check the operation to see if the lamp and lamp circuit are in trouble.
2. Resetting the lamp error count
After the lamp and lamp circuit are found out of trouble, reset the lamp error count. If a lamp error is detected five consecutive times, the power cannot be turned on. Using the cursor (UP/DOWN) key, move to the cursor to [L ERR RESET], Line 4 on display process mode service page 4. With the cursor (LEFT/RIGHT) keys, select the [L ERR RESET] value. Finally press the cursor (UP/DOWN) keys to reset the value to "0". Reset to "0 "
POWER SUPPLY CIRCUIT 
INVERTER CIRCUIT 
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