Down-To; Troubleshooting; Front Panel Leds - Mitsubishi WD-52627 Training Manual

The goal of Down-to-1 troubleshooting is... using a
minimum amount of time and test equipment, make
an accurate diagnosis of a failure 9 out of 10 times.
The 2005-2006 Micro-Display product line lends itself
to this discipline very well.
Using The Front Panel LEDs
The front panel LEDs, Figure 4-1, provide an indica-
tion of the sets operation, and the possible cause of a
malfunction. There are three front panel LEDs, "Power",
"Status" and "Lamp". Which LED is lit, the color and
whether it is blinking or steady indicates to the customer
the current status, or a possible malfunction. Using the
Front Panel LEDs is similar for LCD and DLP based
sets. The indications are also listed in the Owners Guide.
Slow Blinks
Chapter 4

Down-to-1

Normal LED Indications
POWER STATUS
LED LED
Off Off
Green Off
Off Off
Blinks
Off
Green
Off
Green
Abnormal LED Indications
POWER STATUS
LED LED
Off Yellow
Off or On Off
Off Off
Blinks
Off
Yellow
Off Off
Blinks
Off
Red
Off Red

Troubleshooting

Normal Indications... The LEDs provide the cus-
tomer with status information that indicates several nor-
mal operational modes. Normal indications are give in
Table 4-1.
Abnormal Indications... The LEDs also provide the
customer with status information indicating abnormal con-
ditions. Abnormal indications are give in Table 4-2.
LAMP Power
LED Status
Off Stby Off
Off P-0N Power On
30
Blinks Set cannot be turned On until
Seconds
Green Lamp has cooled.
After Off
Off Stby Booting after AC applied
Off Stby On Timer is set
Table 4-1
LAMP Power
LED Status
Low
Off Excess Temperature
Power
No
Yellow Lamp time over 4000 Hrs.
change
Blinks Low
Lamp Cover open
Yellow Power
Off " Filter Cover Open (V28 Only)
Red Stby Lamp did not turn On
Low
Off Fan Stopped
Power
Off " Circuit Failure
Table 4-2
4-1
Figure 4-1: Front Panel LEDs
Condition
Condition