Sharp LC-37GD7E (serv.man2) Service Manual ▷ View online
8
ADJUSTMENT PROCEDURES
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.
improper or an adjustment is required due to part replacement, make an adjustment according to the following
procedure.
1. Display adjustment procedure
1. Adjustment procedure
Enter the display process mode and then adjust COM BIAS.
2. Adjustment process mode key operation table
3. 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.
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.
Caution: Use due care in handling the infomation described here lest your users should know how
to enter the adjustment process mode. If the settings are tampered in this mode,
unrecoverable system damage may result.
unrecoverable system damage may result.
Function 1 (when on the left side of a page)
Moving up by one item or moving to the
previous page (when at the top)
Moving down by one item or moving to the next
page (when at the bottom)
Moving to the right by one item or moving to
another page (in the case of the initial page)
Moving to the left by one item or moving to
another page (in the case of the initial page)
Test pattern off
Moving up by one item or moving to the
previous page (when at the top)
Moving down by one item or moving to the next
page (when at the bottom)
Moving to the right by one item or moving to
another page (in the case of the initial page)
Moving to the left by one item or moving to
another page (in the case of the initial page)
Test pattern off
Moving to the next page
Moving up by one item or moving to the
previous page (when at the top)
Moving down by one item or moving to the next
page (when at the bottom)
Moving to the right by one item or moving to
another page (in the case of the initial page)
Moving to the left by one item or moving to
another page (in the case of the initial page)
previous page (when at the top)
Moving down by one item or moving to the next
page (when at the bottom)
Moving to the right by one item or moving to
another page (in the case of the initial page)
Moving to the left by one item or moving to
another page (in the case of the initial page)
Function 2 (when changing a numeric value)
Incrementing the adjustment value by one or
executing the item (in the case of W or R items)
Decrementing the adjustment value by one or
executing the item (in the case of W or R items)
Moving to the right by one item
Incrementing the adjustment value by one or
executing the item (in the case of W or R items)
Decrementing the adjustment value by one or
executing the item (in the case of W or R items)
Moving to the right by one item
Moving to the left by one item
Executing the item (in the case of W or R
items)
Moving to the next page
items)
Moving to the next page
Incrementing the adjustment value by one or
executing the item (in the case of W or R items)
Decrementing the adjustment value by one or
executing the item (in the case of W or R items)
Moving to the right by one item
executing the item (in the case of W or R items)
Decrementing the adjustment value by one or
executing the item (in the case of W or R items)
Moving to the right by one item
Moving to the left by one item
Key
Cursor UP
Cursor UP
Cursor DOWN
Cursor RIGHT
Cursor LEFT
OK
INPUT
mark of the R/C
(caution required)
CH (
ù)
CH (
Ù)
VOL (+)
VOL (–)
9
Values specific to each Display
Resetting to "0"
After resetting to "0", perform an operational check to ensure that the lamp error detection feature
is not activated.
is not activated.
Table of contents of adjustment process mode Page 0
4 Lamp error detection
4.1
Feature description
This liquid-crystal colour TV incorporates a lamp error detection feature (lamp error detection) that
automatically turns OFF lamp drivers if one lamp fails.
If anything is wrong with the lamp or lamp circuit or when the lamp error detection failure is activated for
some reason, the following will result: All lamps are switched off the audio remains and green led keeps on.
After switching on and off lamps go on for around 1 sec. until lamp error detected.
If anything is wrong with the lamp or lamp circuit or when the lamp error detection failure is activated for
some reason, the following will result: All lamps are switched off the audio remains and green led keeps on.
After switching on and off lamps go on for around 1 sec. until lamp error detected.
4.2 Measures
a)
a)
With lamp error in on mode (green led on) its possible to check the power supply (15 V for lamp
inverters)
b)
Test on inverter circuit is only possible in the fi rst moment after switching on until protection circuit
cuts driver signals for all lamps.
A simple test to fi nd out which lamp inverter does not work: Check with oscilloscope the signal direct-
ly on core of inverter transformers.
c)
Resetting of lamp error counter
After successful repair of lamps or inverter circuits its helpful to reset the lamp error counter through
service mode: see page 8
For resetting go to LCD adjustments in servicemode. With
T‚ go to panel service.
Press now fi rst green button and then ok button on remote control (attention: for protection the green button
is not mentioned in on screen menue).
Red panel servicemenue comes up on screen.
Move cursor with
is not mentioned in on screen menue).
Red panel servicemenue comes up on screen.
Move cursor with
T down to “L ERR Reset” and move to right side with X
Press any cursor to reset lamp error to “0”.
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5.List of process adjustment modes (Display)
(Examples)
Table of contents of adjustment process mode Page 0
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