LC-37HV4E (serv.man8). Troubleshooting table - Sharp TV Service Manual (repair manual). Page 2

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 colour 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