Sharp LC-26D4U Service Manual page 50

LC-26D4U
LC-32D4U
LC-37D4U
TROUBLE SHOOTING TABLE
Is the power LED lit up in blue?
Is the Backlight off?
To "The backlight does not go on."
Is there the clock output at pin (40) of IC4601?
Does the adjustment process menu appear?
Check IC4901 and its peripheral circuits.
Set PATTERN1 → PATTERN1 on the adjustment process menu
to "2". Is the gray scale pattern displayed correctly?
Set PATTERN1 → PATTERN3 on the adjustment process menu
to "2". Is the gray scale pattern displayed correctly?
Set PATTERN1 → PATTERN3 on the adjustment process menu
to "4". Is the test pattern displayed correctly at intervals of one
dot?
Set PATTERN1 → PATTERN3 on the adjustment process menu
to "5". Is the test pattern displayed correctly at intervals of one
dot?
Check the peripheral circuits of IC4601.
No sound or picture comes out.
YES
YES
Table of power LED blinking timing at error occurrence
Type of error
Power supply error
Blinking once: Slow
Lamp error
Blinking once: Fast
Panel power supply error
(VSH) Blinking twice
In-set temperature error
Blinking five times
No picture comes out.
YES
Data dropout (relating to gray scale)
YES
YES
YES
YES
(Continued)
NO
Is the power LED blinking in red?
YES
Check the power supply unit.
Blinking once? (At regular intervals)
NO
Check the power supply circuit.
CCKM and D5V line are in order.
Blinking once?
NO
To "The backlight does not go on."
Blinking twice?
NO
Check the panel power supply detection (VSH).
Blinking five times?
Check the temperature of the set.
NO
To "No picture comes out."
250ms
Power LED operation (1 cycle)
H: ON
L: OFF
H: ON
L: OFF
H: ON
L: OFF
H: ON
L: OFF
NO
Check the FFC (LV, SC3200, SC4601) connections between the
main PWB and LCD control PWB.
NO
Check IC4601 and its peripheral circuits.
NO
Check the connection between SC4651 and SC4652 and check
the peripheral circuits of IC4501.
NO
Check IC4902 and its peripheral circuits.
NO
Check the line between IC4901 and IC4501.
NO
Check the line between IC4901 and IC4501.
50
NO
YES
YES
YES
YES
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