LC-22LE320E - Sharp TV Service Manual (repair manual). Page 115

         2008-03-14 

LC-19LE320, LC-22LE320, LC-26LE320, LC-32LE320, LC-37LE320, LC-42LE320 

 115 

 

 

↓ 

 
 

LINE_FILTER_UNIT:        

↓ YES

 

 
 
 
 
 

 

POWER_UNIT                  

↓YES

  

 
 
 

↓YES 

 
 
 
 

↓YES 

 
 
 
 

↓YES 

 
 
 
 

↓YES 

 
 
 
 
 
 

 

 
 

 
 
 
 

Are the power cord and harness in the unit properly connected? 

NO 

Connect the power cord and harness properly, and turn on the 
power.

Is F901/F902 normal? 

NO 

 

LINE_FILTER_UNIT: 
Isn't RV901,C901,L901,C904,C902,C903,L902,RV903, etc. out 
of order? Moreover, whether the short-circuit with the 
circumference circuit is checked. 
POWER_UNIT: 
BD901, FB905, C910, etc. out of order?  
Moreover, whether the short-circuit with the circumference circuit 
is checked. 

Is BD901 (+320V) output? (Set the main power SW to OFF.) 
 
 

Does the PFC circuit operate normally? 
(L906, Q901, D902, D903, IC901 and etc. And, the circuit around 
the protection circuit etc. is checked.) 

NO 

 

Is a voltage of +5V applied to pin (12,13) of connector (CN902)? 
(Set the main power SW to OFF.)

 

Does the switching circuit operate normally? 
Check circuit around the primary side (T901, IC931, Q931, 
ZD931, ZD930, ZD980, ZD981, etc.), the secondary side (D935, 
L980, etc.), the AC_DET circuit (IC932, IC982, etc.), and the 
protection circuit.

NO 

 

Are +24V output as for the power on/off switch when it is on?

 

NO 

 

Does the inverter circuit operate normally? 
Check circuit around the primary side (T902,Q951,Q952,IC951, 
D951,D952, etc.), the secondary side (D955, C943, etc.), and the 
protection circuit.

 

Similarly, is +12V output as for the power on/off switch when it is 
on?

 

NO 

 

Check +12V circuit of D962, L931, etc.

 

Are +88V output as for the power on/off switch when it is on?

 

NO 

 

Does the inverter circuit operate normally? 
Check circuit around the second side (L907, Q991, D985, IC902, 
Q903 etc.)