Poor Sound; No Vga Input Signal - Philips 32PHT4001/60 Service Manual

7. 7. 7. 7. Poor Poor Poor sound sound

Poor sound

sound
YES
Switch to other audio input, check whether DVD
input and PC main board input has sound
NO
No sound for other inputs; check the sound
amplifier and the shared control circuit
8. 8. 8. 8. No No VGA No No VGA VGA input VGA input input input signal
Check VGA signal input board and see whether the row
and field sync signal protection diode is broke down
Replace the motherboard or
factory reset is normal
Poor sound refers to without sound or with noise; check
whether the selection of sound system is proper
signal signal signal
VGA signal input does not respond, the screen
prompts "Please input signal", check whether PC
signal source and signal line is normal.
YES
NO
No sound; check whether remote control mute is
selected and switch sound system
There is sound for other inputs,
replace TV tuner or control chip
Replace PC or signal line, check
display VGA plug for looseness
Replace the 5.6V Zener diode
on the motherboard
19
NO
YES
NO
YES