LC-30AD1E (serv.man8). troubleshooting table - Sharp TV Service Manual (repair manual). Page 2

PATTERN R, G and B become effective only when the monitor is started singly.  Each can produce a solid 
filled screen of 256-level gray scale, which can be used for IC wire connection checking when a certain gray 
scale level is not produced.

Dropout (gray-scale-related)

Set PATTERN1 on the adjustment 
process menu to "2".  Is the gray 
scale pattern displayed correctly?

Check the color signal in question 
with the gray scale test pattern.  Is 
there a problem with the contact 
and resistance between IC4501 
and SC4601-4604?

Check FFC 
connected to 
SC4601-4604.

Perform checking around 
IC4501 and SC4601-4604.

Set PATTERN3 on the adjustment 
process menu to "1" to "3" (the QS 
drive test pattern is displayed).  Is 
the gray scale displayed correctly?

Perform checking around 
IC4702 and IC4902.

Perform checking between 
IC4701 and IC4501.

Perform checking between 
IC4901 and IC4501.

Set PATTERN3 on the adjustment 
process menu to "4".  Is the test 
pattern displayed correctly at 
intervals of one dot?

Set PATTERN3 on the adjustment 
process menu to "5".  Is the test 
pattern displayed correctly at 
intervals of one dot?

Perform checking between SC2201 
and IC2206, between IC2206 and 
IC4701 or between IC2206 and 
IC4901.

No picture comes out.

Is the RSET terminal (pin (3)) 
of IC2206 set to "H"?

Perform checking around X2201 
connected to pin (161) of IC2206.

Is X2201 connected to pin (161) of 
IC2206 oscillating (18.26 MHz)?

Is IC2202 operating (CONFIG 
ROM)?

Perform checking 
around IC2202.

Check X2201 and the 
peripheral circuitry.

Is the clock (91.3 MHz) applied to 
TL2202 (pin (102) of IC2206)?

Is the normal synchronization 
signal is applied to pins (97), 
(96) and (95) of IC2206?

IC2206 is faulty.

Check IC4903 and the ICs 
(IC4701, IC4702, IC4901 and 
IC4902) downstream from it.

Note that the unit should be replaced when the receiver IC (IC2206), HDCP key ROM (IC2208) or microprocessor 
(IC2004) is replaced.
Applicable unit: DKEYHC094FE50