Service manual

Page 6
V25 / V27 Chassis Down to 1
Troubleshooting
Troubleshooting Steps:
1. If the Power LED is continuously flashing or if other TV controls seem locked, perform a System Reset by
pressing the front panel button or by removing and re-applying AC power.
2. If the Power LED seems abnormal, use the chart below to determine the condition.
3. If the set will not power on or if the Power LED lights then goes out when the Power On command is given
(shut down) perform the Self Diagnostics.
While the set is shut down, on the front panel, press the “DEVICE” and “MENU” buttons at the same time
and hold for 5 seconds. The LED will then flash denoting a two digit Code.
Note: The front panel buttons must be used, NOT those on the Remote Control.
• The number of flashes indicates the Error Code.
• The LED will flash 1, 2 or 3 times, then pause for about 1/2 second then flash 1, 2, 3 or 5 times.
• The Error Code is repeated a total of 5 times.
Use the table below to help narrow down the problem.
Note: The DM Fan should be running any time the set is plugged in.
4. Other Problems:
• For picture and/or audio complaints that may be related an improper customer setting or adjustment,
press the A/V Reset button on the front panel to restore factory default settings.
• For other feature complaints, reset all user controlled functions by pressing <TV MENU><1-2-3>. Then
at the Reset System Defaults screen, press <ENTer>. Note: All customer settings, including
NetCommand will be reset.
• If the cable company is requesting information to enable CableCARD™ service, press <TV MENU>
<9-9-9> to display the host and CableCARD identification. (CableCARD must be installed)
• To place the remote in the NetCommand™ mode, hold the <POWER> button & press <9-3-5>.
• To place the remote back into the standard mode, hold the <POWER> button & press <0-0-0>.
5. PCB Level Troubleshooting:
• Use the Symptom/Cause information to aid in troubleshooting to the PCB level. While this method will
not be 100% accurate, checking all items listed in the Symptom column will increase the probability of
a successful diagnosis. Symptoms can also be caused by poor or mis-seated connectors between the
related PCB’s.
• Additional troubleshooting can be performed by using the PCB Function information to determine the
location of a circuit suspected of malfunctioning.
• PCB locations and part numbers are also provided.
6. Adjustments - For Adjustment Procedures, refer to the Service Manual
• Option Menu <MENU><2-4-7-0>
• Service Adjustment Mode <MENU><2-4-5-7> To reset data, press <0>
• Convergence Adjustment Mode <MENU><2-4-5-9> Coarse <5> Fine <4>
LED Indications Conditions Probable Cause
Off After AC is applied Standy Power Supply or TV µPC not running
Fast Blink for 70 sec. After AC is applied Normal - DM µPC is booting up
Fast Blink (doesn't stop) After AC is applied TV µPC is running, but DM3 failed to boot up.
Slow Blink Set is Off Normal - Timer is set for Automatic Turn ON
Error Code Indication Possible Cause Circuit Location
12 No Error Power Supply Failure PCB-MAIN
21 X-Ray Protection High Voltage Circuit Failure PCB-MAIN
22 Short Circuit Protection Power Supply Failure PCB-MAIN
23 Deflection Loss Protection
Horizontal or Vertical
Deflection Circuit Failure
PCB-MAIN (Horiz)
PCB-SIGNAL (Vert)
35 DM Fan Failure DM Fan or Connector PCB-DM3