Philips DPTV465 Service Manual page 16

EN 16 5. DPTV465
Note: Error codes 1,2, 3, and 4 are protection codes, and in this
case, the supplies of some circuits will be switched "off". Also,
in protection, the LED will blink the number of times equivalent
to the most recent error code.
5.6
The "Blinking LED" Procedure
5.6.1
Introduction
The contents of the error buffer can also be made visible
through the "blinking LED" procedure. This is especially useful
when there is no picture.
When the SDM is entered, the LED will blink the number of
times equal to the value of the error code.
–
The ON/OFF indicator going out for 500 ms precedes all
error code sequences. (There is a possibility of up to 10.)
–
After the 500 ms delay, the ON/OFF indicator will slowly
flash the first number of the first code.
–
This immediately follows by rapid flashes for the second
number in the first code. If an error code is smaller than 10,
the ON/OFF indicator will rapidly flash 1-9 times to indicate
the code. (EXP. Six rapid flashes indicate an error code of
6.)
–
There will be a delay of approximately 3 seconds between
codes.
–
For error codes of 10 and higher, the ON/OFF indicator will
slowly flash the correct number of times to indicate the first
digit, and will then rapidly flash the correct number of times
to indicate the second digit. (EXP. Three slow flashes
followed by six rapid flashes indicate an error code of 36.)
–
When all error-codes are displayed, the sequence is
finished and the ON/OFF indicator turns OFF for 300 ms.
At this point the sequence will begin again as indicated by
the ON/OFF indicator turning ON for 300 ms and repeating
all error codes.
Example: 112 024 036 0 0
After entering SDM:
–
The sequence will begin by the ON/OFF indicator turning
off for 500 ms.
–
Then slowly blink 11 times followed by two rapid blinks
(indicating error code 112).
–
Next the LED will pause for 300 ms followed by 2 slow
blinks follow by 4 rapid blinks, (indicating error code 024).
–
Next the LED will pause for 300 ms, then slowly blink 3
times followed by 6 rapid blinks (indicating error code 36).
–
Then pause 300 ms ending the sequence in this example.
–
If there were error codes in positions 4 and 5, those
sequences would also be given.
Note: If errors 1, 2, 3, or 4 occur, the LED always blinks
indicating the last error that occurred, even if the set is not in
service mode.
5.7
Trouble Shooting Tips
5.7.1
Introduction
Before the set can be repaired to a component level, it is
necessary to determine which board is defective. The Wiring
interconnect diagram is a useful tool for this (see chapter 6).
5.7.2
Dead set
The Standby Power supply and Rectifiers are located on the
Input panel. Control for power On/Off is performed by the
Microprocessor located on the SSB. This Processor is powered
by the 5 Volt standby voltage from the Input Panel. For a Dead
Set condition, check the 5 Volt standby supply on Pin 1 of 1102.
If this voltage is present, check the Standby line on Pin 3. This
Service Modes, Error Codes, and Fault Finding
5.7.3
5.7.4
line will be approximately 2.6 Volts in standby and zero Volts
when the set is turned "on". If the Standby line goes Low, check
the 130 Volt source on Pin 8 of connector 1518. If this voltage
is present, the Full Power supply on located on the Large
Signal panel is working. If the Picture is not present but audio
is, the High voltage or video drive circuits may have failed.
Checking the Screen voltage from the Focus G2 block will
indicate whether the High voltage circuit is working or not.
Horizontal and Vertical drive from the HOP panel must be
present for the High voltage to be present. Horizontal drive
should be present on Pin 9 of 1510 and Vertical drive should be
present on Pin 3.
No Picture
If Audio is present but there is no Picture, press the Index
button on the Remote control. If OSD is present, High voltage
is working and the CRT drive circuits are working. If the signal
is NTSC, YUV from the SSM is fed to the HOP on connector
1250. YUV from the SSB can be checked on Pins 25, 24, and
23 of connector 1020.
No Audio
The Audio amplifier is located on the SSM. The Audio is
powered by a supply located on the Large Signal panel. This
voltage can be checked on Pins 10 and 11 of connector 1516.
These voltages will measure a plus 23 and a minus 23 Volts.
Speaker output can be checked on connector 1349. A Centre
Channel Amp switch panel will be present on the Core models