LC-15A2E (serv.man2). text - page 1-15 - Sharp TV Service Manual (repair manual). Page 10

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LC-15A2E
10
TROUBLE SHOOTING TABLE
No picture, No sound
Check all the settings microprocessor's adjust process menu.
Do F2, F3 and F4 
function?
Are T701's secondary 
outputs, +38V, +16V, +9V, 
+5V and -8V normal?
Remove F2, F3 and F4 
and check the load side.
Is there short-circuiting?
Is there short-circuiting of 
T701 primary side periphery, 
Q701, Q710 and S4701.
Replace F2, F3 and F4.
Check S4701 and 
connection cable.
Is T701's primary oscillator 
waveform normal?
Check T701's secondary 
load.
Yes
Yes
No
No
No
No
Yes
Fluorecent lamp failure to light up
Does F1 function?
Is the pin 34 of IC1201 in 
the "H" state?
Is the Q754 short-circuiting?
Is there short-circuiting of 
T751 and T752 primary 
side periphery, Q751~Q753.
Yes
Yes
No
No
No
Yes
Replace the fluorecent lamp 
with new one and check 
again.
Yes
Check the OFL1 line, IC1201 
and their peripheral parts.
Check Q754 and their 
peripheral parts.
Check T751, T752, 
Q751~Q753 and connection 
cable.
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