Sharp LC-37HV4M Service Manual page 23

TROUBLE SHOOTING TABLE (Continued)
No image comes out.
NO
Is a HIGH appearing
at the RESET terminal
of pin (3) of IC2206?
YES
Is a clock (91.3 MHz)
NO
appearing at TL2201
(pin (102) of IC2206)?
YES
Is a normal sync
signal appearing at
NO
TL2202 (pin (97) of
IC2206), TL2203 (pin
(96) of IC2206) and
TL2204 (pin (95) of
IC2206)?
YES
Check IC4903 and later
ICs (IC4701, IC4702,
IC4901 and IC4902).
Dropout (relating to gray scale)
Set PATTERN1 under
NO
PATTERN on the adjustment
process menu to "2". Is the
gray scale pattern displayed
properly?
YES
Send "6071" and "6303" to
LCD DATA under OTHER on
NO
the adjustment process
menu to display the QS drive
test pattern and then send
"6102". Is the gray scale
displayed properly?
YES
Send "6202" to LCD DATA
under OTHER on the
NO
adjustment process menu. Is
the test pattern displayed
properly at intervals of one
dot?
YES
Send "6203" to LCD DATA
under OTHER on the
adjustment process menu. Is NO
the test pattern displayed
properly at intervals of one
dot?
YES
Check the connections
between SC2201 and
IC2206, between IC2206 and
IC4701, and between IC2206
and IC4901.
Check the circuits
around X2201
connected to pin (161)
of IC2206.
Is X2201 connected to pin
NO
(161) of IC2206 oscillating
(18.26MHz)?
YES
NO
Is IC2202 (CONFIG ROM)
operating?
YES
Failure of IC2206
Identify the color signal
presenting a problem in the gray
scale test pattern.
Is there any problem with the
connections and resistances
between IC4501 and SC4601-
SC4604?
YES
Check IC4501 and
SC4601-SC4604.
Check IC4702, IC4902
and the circuits around
them.
Check the connections
between IC4701 and
IC4501.
Check the connections
between IC4901 and
IC4501.
23
Check X2201 and the
circuits around it.
Check IC2202 and the
circuits around it.
NO Check the FFC
connected to SC4601-
SC4604.
LC-37HV4M
LC-37HV4H