Philips F21RE, Service Manual

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Service Modes, Error Codes, and Fault Finding EN 35 F21RE AB 5.
5.5.3
Error Codes
If the set has non-intermittent faults, clear the error buffer
before you begin the repair. This to ensure that old error codes
are no longer present.
If possible, check the entire contents of the error buffer. In
some situations, an error code is only the result of another error
code and not the actual cause of the problem (for example, a
fault in the protection detection circuitry can lead to a
protection).
Table 5-3 Error Code Overview
5.6
Protections
The microprocessor (OTC) of the F21R Receiver box remains
active during standby. This because power of the
microprocessor (and the attached memory chip set) is coming
from the 3V3 supply, which is derived from the 5V Standby
circuitry.
Therefore, in both "Power on" as in "Standby" mode, the
microprocessor is connected to this power supply. The
microprocessor controls the "Standby" line for switching "on"
and "off" the main supply. In the standby mode, or in the
protection mode, the "Standby" line will open the contacts of
relay 1400 (diagram PS) via T7401, which results in switching
"off" the mains input to the main supply.
We can divide the chassis protections in two groups:
1.
I2C protections: from I2C-busses (fast and slow) or I2C-IC
errors (device errors).
2.
OTC input protections.
5.6.1
I2C Protections
During normal operation, some registers of the I2C controlled
ICs are refreshed every 200 milliseconds. During this
sequence, the three I2C busses and the I2C ICs will also be
checked.
Possible protections:
•
I2C bus protections. This will take place if the SDA and
SCL are short-circuited to ground or to each other.
•
I2C device protections. This can occur when there is a
malfunction in the communication with one specific device,
or if the power supply of the device is missing.
•
FBX and/or Tuner circuitry protection. If one of these
circuits does not respond for more than 1 second
Error Device Description Defective item Diagram Defective module
indication
2 ST24E32 or M24C32 Non volatile memory IC7008 K7 Control
3 SAA580x OTC2.5 microprocessor/TXT IC7003 K7 Control
5 UV1316 Tuner U1102 K1 Tuner
10 TEA6415 I/O source select video IC7208 K8 Source select
11 TEA6422 I/O source select audio IC7777 K8 Source select
15 TDA9320 HIP I/O-video processing IC7501 K1 Chroma IF IO
20 TDA9330 HOP video control/deflection proc-
essor IC7300 K6 Video Controller
21 TDA9178 (if present) LTP Peaking (TOPIC) IC7402 K6 Video Controller
23 UPD64083 (if present) 3D Comb IC IC7023 C0 3D Comb Filter
25 MSP34xxx ITT sound processor IC7751 K3 Audio Module
27 PCF8574 I/O Expander IC7880 AV8 AV-Interface
30 TEA6415 Video Selection Switch IC7710 AV7 AV-Interface
31 TEA6422 Audio Selection Switch IC7810 AV8 AV-Interface
33 ACEX-EPLD HD signal/sync processing IC7360 AV3 AV Interface
35 UV1316 (if present) FDS Tuner U1102 M1 Video Dual Screen
Panel
36 PCF8574 (if present) FDS I/O Expander IC7860 M2 Video Dual Screen
Panel
37 SAB9079 (if present) FDS Popov IC7700 M4 Video Dual Screen
Panel
38 TDA9320 (if present) FDS HIP2 IC7501 M1 Video Dual Screen
Panel
39 M24C04 (if present) FDS NVM IC7991 M1 Video Dual Screen
Panel
41 TDA7309 (if present) FDS Headphone IC7620 M5 Video Dual Screen
Panel
50 SAA4978 FBX Picnic IC7611 L1 Feature Box
52 T8F24EF (if present) FBX Eagle IC7724 L2 Feature Box
53 SAA4992 FBX Falconic IC7626 L3 Feature Box
65 Slow I2C bus blocked See block diagram Slow I2C Blocked
66 Fast I2C bus blocked See block diagram Fast I2C Blocked
67 Supply 5V 5V2 See block diagram +5V Supply
68 Supply 8V 8V6 See block diagram +8V Supply
77 Featurebox protection FBX prot. +3V FBX Supply
80 Tuner protection Tuner prot. U1102 K1 +8V Tuner Supply
81 UPD64083 (if present) 3D Comb prot. IC7023 C0 3D Comb Filter