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•
Symptom: +1V2 present for about 100 ms. Supplies +2V5
and +3V3 not rising.
1. Check the ENABLE-3V3 signal (active "low").
2. Check the voltage on pin 8 (1.5 V).
3. Check the under-voltage detection circuit (the voltage
on collector of transistor 7U10-1 should be less than
0.8 V).
4. Check for output voltages short-circuits to GND (+3V3,
+2V5 and +2V5D) that generate pulsed over-currents
of 7-10 A through coil 5U00.
5. Check the over-current detection circuit (2U18 or 3U83
interrupted).
•
Symptom: +1V2 OK, but +2V5 and +3V3 present for about
100 ms. Cause: The SUPPLY-FAULT line stays "low"
even though the +3V3 and +1V2 is available. The Stand-by
Processor is detecting that and switches all supply
voltages "off".
1. Check the drop voltage across resistor 3U22 (this
could be too high)
2. Check if the +1V2 or +3V3 are higher than their normal
values. This can be due to defective DC feedback of
the respective DC/DC converter (3U18 or 3UA7).
•
Symptom: +1V2, +2V5, and +3V3 look okay, except the
ripple voltage is increased (audible noise can come from
the filtering coils 5U00 or 5U03).
Cause: Instability of the frequency and/or duty cycle of one
or both DC/DC converters.
–
Check resistor 3U06, the decoupling capacitors, the
AC feedback circuits (2U20 + 2U21 + 3U14 + 3U15 for
+1V2 or 2U19 + 2U85 + 3U12 + 3U13 for +3V3), the
compensation capacitors 2U09, 2U10, 2U23 and
2U73, and IC 7U00.
Note 1: If fuse 1U01 is broken, this usually means a pair of
defective power MOSFETs (7U01 or 7U03). Item 7U00 should
be replaced as well in this case.
5.8
Software Upgrading
5.8.1
Introduction
The set software and security keys are stored in a NAND-Flash
(item 7P80), which is connected to the VIPER via the PCI bus.
It is possible for the user to upgrade the main software via the
USB port. This allows replacement of a software image in a
standalone set, without the need of an E-JTAG debugger. A
description on how to upgrade the main software can be found
in chapter 3 "Directions For Use".
Important: When the NAND-Flash must be replaced, a new
SSB must be ordered, due to the presence of the security
keys!!! See table "SSB service kits" for the order codes.
Perform the following actions after SSB replacement:
1. Set the correct option codes (see sticker inside the TV).
2. Update the TV software (see chapter 3 for instructions).
3. Perform the alignments as described in chapter 8.
4. Check in CSM menu 5 if the HDMI and POD keys are valid.
Table 5-4 SSB service kits
12 NC
3139 267 29251
5.8.2
Main Software Upgrade
The software image resides in the NAND-Flash, and is
formatted in the following way:
Service Modes, Error Codes, and Fault Finding
Description
SSB Service Kit PTV 2k6
EBJ1.0U
Partition 1
Trimedia2 image
Trimedia1 image
MIPS image
Partition 0
USB Download Application
uBTM (boot block)
Figure 5-5 NAND-Flash format
Executables are stored as files in a file system. The boot loader
(uBTM) will load the USB Download Application in partition 0
(USB drivers, bootscript, etc). This application makes it then
possible to upgrade the main software via USB.
Installing "Partition 0" software is possible via an external
EJTAG tool, but also in a special way with the USB stick (see
description in paragraph "Partition 0").
Partition 1 (Customer)
To do a main software upgrade (partition 1) via USB, the set
must be operational, and the "Partition 0" files for the VIPER
must be installed in the NAND-Flash!
The new software can be uploaded to the TV by using a
portable memory device or USB storage compliant devices
(e.g. USB memory stick). You can download the new software
from the Philips website to your PC.
Partition 0 (Service)
If the "Partition 0" software is corrupted, the software needs to
be re-installed.
To upgrade this "USB download application" (partition 0 except
the bootblock), insert an USB stick with the correct software,
but press the "red" button on the remote control (in "TV" mode)
when it is asked via the on screen text.
Caution:
•
The USB download application will now erase both
partitions (except the boot block), so you need to reload the
main SW after upgrading the USB download application.
As long as this is not done, the USB download application
will start when the set is switched "on".
•
When something goes wrong during the progress of this
method (e.g. voltage dip or corrupted software file), the set
will not start up, and can only be recovered via the EJTAG
tool!
5.
EN 25
USB CUSTOMER
USB SERVICE
EJTAG
E_14700_082.eps
120505
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