Mitsubishi V19-V21, Tehnical Manual

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11-1
Chapter 11
Troubleshooting Tips
Troubleshooting the analog circuitry in the V19/V21 is
basically the same as in previous modes. Although the
DM Module is a replaceable component, the service
technician must determine that it is the cause of a prob-
lem. The following tips are useful in determining the
source of a problem
Using The Front Panel LED
The Front Panel LED helps isolate the cause of the
following problems.
• The TV will not turn On.
• The TV turns On, and then Shuts Off.
If the TV will not turn On , the LED response indi-
cates the possible cause of the problem. Table 11-1
lists the possible LED response when this problem
occurs.
When the TV turn On and then shuts Off, the LED
Diagnostic Error codes help isolate the problem. This
is the same LED Diagnostic featured on some previ-
ous model TVs.
Figure 11-1 shows the LED Error Code Activation
Procedure, an is describe in the following:
1) With the TV Off
2) Press and hold the front panel "MENU" and
"DEVICE" buttons for 5 seconds.
3) The LED will flash the Error Code indicating
what caused the TV to shut Off.
4) The Error Code will be repeated 5 times.
5) When the LED stops flashing the mode is
automatically terminated.
Reading the Error Codes
The Error Codes are two digit numbers. The LED:
• Flashes the value of the most significant digit
(MSD).
• Then there is a pause.
• Flashes the value of the least significant digit
(LSD).
• The Error Code is repeated 5 times.
LED Indications Conditions Probable Ca use
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 DM failed to boot up
Slow Blink Set is Off Normal - Timer is set for Automatic Turn ON
Table 11-1: Front Panel LED Indications