Sharp 27DV-S100 Service Manual page 58

No Sound
NO
IC3001(MTS)
Audio signal output from pin(3),(2)?
YES
NO
Speaker amp (IC6351)
pin(10) = 27V ?
YES
NO
Speaker amp (IC6351)
Audio signal input to pin(2), (5) ?
YES
NO
Speaker amp (IC6351)
pin(8) = 0V ?
YES
Check between TV Power PWB and
speaker.
YES
IC3001 (MTS)
Audio signal output from pin(40), (39)?
NO
NO
IC3001 (MTS)
Audio signal input to pin(14)?
YES
Replace IC3001
FLOW CHART No.1-5
Check TV power circuit
Check between IC3001 and IC6351
Check speaker mute line between
IC2001 (µ-com) and IC6351
Check between IC3001 and IC3201
(EQ Sound)
Check between TU1951 (tuner) to
IC3001
Protect Mode
When a unit changes into a dangerous state, it turns off automatically and makes Power LED flash
on and off continually to indicate the Protect Mode.
Flashing 1 time X-Ray (/Def. Over Current/Dynamic Focus Over Voltage) protect
Flashing 2 times Vetical-Out Protect
Flashing 3 times TV Power Short Protect
X-Ray Protect
(Check when power On)
YES
System control (IC2001)
Check or replace IC2001
pin(83) = 5.0V("H")?
NO
YES
X-Ray protector
Check between Q2808
Q2808 collector = 5.0V("H")?
and IC2001
NO
NO
X-Ray protector
Check between D5623
D5623 anode = over 4V?
and Q2808 base
YES
YES
X-Ray protector
+B voltage (L9720) =
D5623 cathode = over 13.5V?
130V?
NO
Check Hi-Voltage (33kV;CRT anode), FBT T5603 and
peripheral circuit
NO
Def. over current protector
Check Q5606 and D5608
Q5606 base = over 4V?
YES
YES
Def. over current detector Check FBT T5603,
Q5610 collector = about peripheral circuit and
130V? deflection circuit
NO
Dynamic focus over voltage YES
Check dynamic focus
detector D5627 anode = over circuit (Q5604, T6601 and
5V?
peripheral circuit)
NO
Check R5646, R5648 and
D5628
FLOW CHART No.1-6
NO
Check TV power
circuit
YES