Philips 37PF9631D/37 Service Manual page 16

EN 16 5. EJ2.0U LA
2FH 576P" or "RGB 2FH 1080I". Audio signal quality:
"STEREO", "SPDIF 1", "SPDIF 2", or "SPDIF".
• Audio System. Gives information about the audible audio
system. Possible values are "Stereo", "Mono", "Mono
selected", "Analog In: No Dig. Audio", "Dolby Digital 1+1",
"Dolby Digital 1/0", "Dolby Digital 2/0", "Dolby Digital 2/1",
"Dolby Digital 2/2", "Dolby Digital 3/0", "Dolby Digital 3/1",
"Dolby Digital 3/2", "Dolby Digital Dual I", "Dolby Digital
Dual II", "MPEG 1+1", "MPEG 1/0", "MPEG 2/0". This is the
same info as you will see when pressing the "INFO" button
in normal user mode (item "signal"). In case of ATSC
receiving there will be no info displayed.
• Tuned Bit. Due to the ATSC architectural setup, this item
does not give useful information anymore.
• Preset Lock. Indicates if the selected preset has a child
lock: "LOCKED" or "UNLOCKED". Change via "MENU",
"TV", "CHANNELS", "CHANNEL LOCK".
• Lock After. Indicates at what time the channel lock is set:
"OFF" or e.g. "18:45" (lock time). Change "MENU", "TV",
"CHANNELS", "LOCK AFTER".
• TV Ratings Lock. Indicates the "TV ratings lock" as set by
the customer. Change via "MENU", "TV", "CHANNELS",
"TV RATINGS LOCK". Possible values are: "ALL",
"NONE", "TV-Y", "TV-Y7", "TV-G", "TV-PG", "TV-14" and
"TV-MA".
• Movie Ratings Lock. Indicates the "Movie ratings lock" as
set by the customer. Change via "MENU", "TV",
"CHANNELS", "MOVIE RATINGS LOCK". Possible values
are: "ALL", "NR", "G", "PG", "PG-13", "R", "NC-17" and "X".
• V-Chip TV Status. Indicates the setting of the V-chip as
applied by the selected TV channel. Same values can be
shown as for "TV RATINGS LOCK".
• V-Chip Movie Status. Indicates the setting of the V-chip
as applied by the selected TV channel. Same values can
be shown as for "MOVIE RATINGS LOCK".
• Options 1. Gives the option codes of option group 1 as set
in SAM (Service Alignment Mode).
• Options 2. Gives the option codes of option group 2 as set
in SAM (Service Alignment Mode).
• AVL. Indicates the last status of AVL (Automatic Volume
Level): "ON" or "OFF". Change via "MENU", "TV",
"SOUND", "AVL". AVL can not be set in case of digital
audio reception (e.g. Dolby Digital or AC3)
• Delta Volume. Indicates the last status of the delta volume
for the selected preset as set by the customer: from "-12"
to "+12". Change via "MENU", "TV", "SOUND", "DELTA
VOLUME".
• HDMI key validity. Indicates if the HDMI keys (or HDCP
keys) are valid or not. In case these keys are not valid and
the customer wants to make use of the HDMI functionality,
the SSB has to be replaced.
• IEEE key validity. Not applicable.
• POD key validity. Not applicable.
• Digital Signal Quality. This item does not work correct, so
it gives no useful information.
How to Exit CSM
Press any key on the RC-transmitter (with exception of the
"CHANNEL +/-", "VOLUME", "MUTE" and digit (0-9) keys).
5.2.4 Service Mode of Converter Boards for Ambi Light
Purpose
To switch on the lamps manually in case I
fails.
The Service Mode can be activated by disconnecting
connector 1M49 and then by shorting for a moment the two
solder pads [1] on the Ambi Light Inverter Panel. See figure
"Service Mode pads".
Service Modes, Error Codes, and Fault Finding
2
C-bus triggering
Figure 5-2 Service Mode pads AmbiLight panel
In this chassis, single fitted boards are used. It drives 1 lamp
unit (3 lamps) per board.
The double fitted boards (which are used in other sets) are
supplied by +12Va and +12Vb. The microprocessor is supplied
by +12Va.
Therefore, if only +12Va is available, lamp unit B will not work.
See figure "Building blocks of Converter Board" for details.
Inverters
+12Va +5V
Stab.
Board select
PWM out
I²C
Protection
Figure 5-3 Building blocks of Converter Board
The microprocessor performs the following tasks:
• Dimming of Ambi Light by means of PWM.
2
• Translation of I C-bus commands to PWM.
• Switches the Ambi Light board to protection if needed (in
case of protection only the lamps switch off, no set
protection is triggered).
There are two ways of protection: parallel arcing protection and
serial arcing protection.
Parallel arcing protection is performed by sensing the switching
frequency. In case of short circuit of the transformer output, this
frequency > 100 kHz and the board goes into protection.
Serial arcing protection is performed by detection of arc in
ground wire of the lamp units. In this case, the protection pulse
is transmitted via an opto-coupler.
Protection can be disabled by short-circuiting diode 6112 or
capacitor 2173 or by connecting pin 8 of the microprocessor to
ground.
Repair Tips
In case only one or no lamp unit at all works, probably the
+12Vb (12 - 13 V) is not available or the fuse is broken. Check
for broken MOSFETS or check if they are switched off properly
1
G_15950_049.eps
060406
+12Va
Lamp unit A
Lamp unit B
+12Vb (12-13V)
G_15950_050.eps
060406