Sharp 37HV4U - LC - 37" LCD TV, Service Manual

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LC-37HV4U
LC-37HV4D
Dropout (relating to gray scale)
Set PATTERN1 under
PATTERN on the adjustment
process menu to "2". Is the
gray scale pattern displayed
properly?
Send "6071" and "6303" to
LCD DATA under OTHER on
the adjustment process
menu to display the QS drive
test pattern and then send
"6102". Is the gray scale
displayed properly?
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
YES
YES
NO NO
Check IC4501 and
SC4601-SC4604.
Check IC4702, IC4902
and the circuits around
them.
NO
Send "6202" to LCD DATA
under OTHER on the
adjustment process menu. Is
the test pattern displayed
properly at intervals of one
dot?
Check the connections
between IC4701 and
IC4501.
NO
NO
YES
YES
Send "6203" to LCD DATA
under OTHER on the
adjustment process menu. Is
the test pattern displayed
properly at intervals of one
dot?
Check the connections
between SC2201 and
IC2206, between IC2206 and
IC4701, and between IC2206
and IC4901.
Check the connections
between IC4901 and
IC4501.
Check the FFC
connected to SC4601-
SC4604.
YES
YES
YES
No image comes out.
Is a HIGH appearing
at the RESET terminal
of pin (3) of IC2206? Check the circuits
around X2201
connected to pin (161)
of IC2206.
NO
Check IC4903 and later
ICs (IC4701, IC4702,
IC4901 and IC4902).
Is a clock (91.3 MHz)
appearing at TL2201
(pin (102) of IC2206)? Is X2201 connected to pin
(161) of IC2206 oscillating
(18.26MHz)? NO
Check X2201 and the
circuits around it.
NO
YES
YES
Is a normal sync
signal appearing at
TL2202 (pin (97) of
IC2206), TL2203 (pin
(96) of IC2206) and
TL2204 (pin (95) of
IC2206)?
Is IC2202 (CONFIG ROM)
operating?
Failure of IC2206
NO
Check IC2202 and the
circuits around it.
NO
TROUBLE SHOOTING TABLE (Continued)