Directview LCD Training 33 Circuit Descriptions
CIRCUIT DESCRIPTIONS
32” AUDIO
TROUBLESHOOTING
Low DTV audio
Problem: Digital TV audio is at a lower level than analog TV.
Resolution: Install firmware version 3.13 or newer.
Auto volume up
Problem: The volume suddenly goes up when the TV is turned on.
Resolution: Most likely changing the control panel PCB will fix the problem. Also check the connection
on the main PCB.
Video but no sound
Problem: Partial or no sound. Resolution: First, check the menus to make sure the speakers are not
turned off. Try different sources. If all sources have no sound, change the PCB that handles audio
(normally the main PCB, jackpack PCB on new models with cable card support). Also check all
connectors and cables.
Resolution: If only digital audio (from HDMI or Optical input) is missing, the input device doesn’t
support Dolby digital or the TV needs an updated main PCB. There are a few 2005 models that did
not process digital audio properly and audio processing was updated during production. In this
case, changing the Jackpack PCB will remedy the problem.
No sound
Replace power board
Check Sound supply :
A_board P804 #1 18V
Check output
to the Speaker :
Dose P601 No.1 waveform
exist?
Check
If A_board 18V
is short-circuited.
Resistance btween A_board
P821 Pin No.2
and 3 infnity?
FAIL
FAIL
FAIL
Replace A_board
Replace A_board
Replace Speaker
PASS
PASS
Measure
A_power board trans output:
18V at power_board
CN803 #1
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