SHARP LC-30HV6U SERVICE MODE AND POWER SUPPLY CIRCUIT

SHARP LC-30HV6U SERVICE MODE AND POWER SUPPLY CIRCUIT

SHARP LC-30HV6U 

SERVICE MODE AND POWER SUPPLY CIRCUIT 

ADJUSTMENT

The adjustment values are set to the optimum conditions at the factory before shipping. If a value should become improper or an adjustment is required due to part replacement, make an adjustment according to the following
procedure.
Preparation
Note that the unit should be replaced when the receiver IC (IC2206), CONFIG ROM (IC2202) or microprocessor (IC2004) is replaced.
Applicable unit: DKEYHC094FE51
Adjusting procedure
# VLS BIAS (15V) voltage adjustment
# Entering the adjustment process mode  > COM BIAS adjustment > Background adjustment
How to enter the adjustment process mode
(1) When the AVC center is not connected
# Turn OFF the monitor main power. Turning ON the monitor main power while pressing the "INPUT" key and "VOL (–)" key on the top face of the monitor main body together will establish the "Monitor Process" mode.
(2) When the AVC center is connected
# Turn OFF the monitor main power. Turning ON the monitor main power while pressing the "CH (Ù)" key and "VOL (+)" key on the top face of the monitor main body together will establish "Monitor Process" mode.

In each case of (1) and (2), "<K>" is displayed in the upper left portion of the screen.
Then, pressing any key will bring you to the first page of the "Monitor Adjustment" mode

Adjustment
VLS BIAS (13V) voltage adjustment (R4231)
Connect a digital volt meter to TL4122 (or C4180+) on the LCD Control PWB and make a adjustment with the R4231 so that the voltage becomes 13.00V±0.05V.
COM BIAS adjustment
Shift to the "COM BIAS" item with the cursor UP/DOWN key and select a numeric value with the cursor RIGHT/LEFT key. Changing the numeric value with the cursor UP/DOWN key will make appear the test pattern. Make an adjustment so that the flicker near the center of the screen is minimized.
Background adjustment
Start up the set with the AVC System connected and adjust the background of the monitor.
# Procedure
-1) Display the adjustment screen (200-level gray scale on High side, 48-level gray scale on Low side).
-2) Adjust "R OFFSET", "G OFFSET" and "B OFFSET" so that the 200-level gray scale pattern becomes normative. Adjust the chromaticity of the High pattern (in the left portion of the screen) so that x = 0.290 and y = 0.299.
-3) Adjust "R GAMMA", "G GAMMA" and "B GAMMA" so that the 48-level gray scale pattern becomes normative.
Adjust the chromaticity of the Low pattern (in the right portion of the screen) so that x = 0.276 and y = 0.278.

The above-mentioned adjustments can be made according to the following procedure.

Adjusting method using RS-232C
# Get a personal computer with a COM port (RS-232C) equipped with WINDOWS 95/98/me/2000/xp and a RS-232C crossing cable
# Start up the set with the RS-232C cable connected.
# Start up the terminal software.
(Freeware products available on the Internet can be used.)
# Make setting as shown below.
Baud rate : 9600
Data : 8 bits
Parity : None
Stop : 1 bit
Flow control : None
# If the above setting is made correctly, pressing the "SET/ENTER" key on the PC will make "ERR" appear on the terminal software.
# In this state, entering a command shown in the table bellow and pressing the "SET/ENTER" key will allow you to make an adjustment.
If "OK" is displayed on the terminal software after the "SET/ENTER" key is pressed, the command has been entered successfully.
If "ERR" is displayed, enter the command again

Lamp error detection
1. Feature description
This liquid-crystal color TV incorporates a lamp error detection feature (lamp error detection) that automatically turns OFF the power for safety under abnormal lamp or lamp circuit conditions. If anything is wrong with the lamp or lamp circuit or the lamp error detection feature is activated for some reason, the following will result.
1. The power of TV main body is turned OFF about 13 seconds after it is turned ON. (The power LED on the front of the TV turns red from green and keeps blinking in red (ON for 250ms and OFF for 1sec).)
2. If 1 occurs five times consecutively, it becomes impossible to turn ON the power. (The power LED keeps blinking in red (ON for 250ms and OFF for 1sec).)
Measures
1.Checking with lamp error detection OFF

Disconnect the cable connected to the AVC System Turn OFF the monitor main power. Turning ON the monitor main power while pressing the "INPUT" key and "VOL (–)" key together will establish the "Monitor Process" mode ("<K>" is displayed).
Then, pressing any key will bring you to the first page of the "Monitor Process" mode. This allow you to check the lamp and lamp circuit for abnormal conditions. Check that "L ERR RESET" on the fourth line of the first page of the "Monitor Process" mode is 1 or more. If it is 1 or more, a lamp error has been detected.
2.Reset of lamp error count
After checking the lamp and lamp circuit for abnormal conditions, reset the lamp error count. Move the arrow to "L ERR RESET" on the fourth line of the first page of the "Monitor Process" mode with the cursor UP/DOWN key and select the numeric value of "L ERR RESET" with the cursor RIGHT/LEFT key. In this state, press the cursor UP/DOWN key to reset it to "0".

Table of monitor power LED blinking timing at the time of error occurrence

LED BLINKING	Error type
1	Cable error AVC-side power error Blinking once: Slow
1	Lamp error Blinking once: Fast
2	Monitor power error Blinking twice
3	AVC temperature error Blinking three times
4	AVC fan error Blinking four times
5	Monitor temperature error Blinking five times
6	Monitor fan error Blinking six times
7	Monitor 1-bit error Blinking seven times

 POWER SUPPLY CIRCUIT 

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