Sunday, January 03, 2016

PHILIPS 47PFL5507T Service mode and troubleshooting tips - Philips LED television repair

Category: LED LCD Television repair 

Contents of this article 

  • Service Alignment mode 
  • Customer service mode
  • Service Default mode 
  • Fault finding tips 

PHILIPS 47PFL5507T

Service Alignment Mode (SAM)
Purpose
# To perform (software) alignments.
# To change option settings.
# To easily identify the used software version.
# To view operation hours.
# To display (or clear) the error code buffer.
How to Activate SAM
Via a standard RC transmitter: Key in the code “062596” directly followed by the “INFO”/”HOME” button. After activating SAM with this method a service warning will appear on the screen, continue by pressing the “OK” button on the RC.
How to Exit SAM
Use one of the following methods:
# Switch the TV set to STAND-BY via the RC-transmitter.
# Via a standard RC-transmitter, key in “00” sequence, or select the “BACK” key.
Customer Service Mode (CSM)
Purpose
When a customer is having problems with his TV-set, he can call his dealer or the Customer Helpdesk. The Service technician can then ask the customer to activate the CSM, in order to identify the status of the set. Now, the Service technician can judge the severity of the complaint. In many cases, he can advise the customer how to solve the problem, or he can decide if it is necessary to visit the customer. The CSM is a read only mode; therefore, modifications in this mode are not possible.
When in this chassis CSM is activated, a testpattern will be displayed during 5 seconds (1 second Blue, 1 second Green and 1 second Red, then again 1 second Blue and 1 second Green). This test pattern is generated by the PNX51X0. So if this test pattern is shown, it could be determined that the back end video chain (PNX51X0, LVDS, and display) of the SSB is working. For TV sets without the PNX51X0 inside, every menu from CSM will be used as check for the back end video chain. When CSM is activated and there is a USB stick connected to the TV set, the software will dump the complete CSM content to the USB stick. The file (Csm.txt) will be saved in the root of the USB stick. This info can be handy if no information is displayed. To have fast feedback from the field, a flashdump can be requested. While in CSM, push the red button + dial serial digits ‘2679’ (same keys to form the word ‘COPY’ with a cellphone). A file Dump_settype_serienumber.bin will be written on the connected USB device. This can take 1/2 minute, depending on the quantity of data that needs to be dumped.
How to Activate CSM
Key in the code “123654” via the standard RC transmitter.
Note: Activation of the CSM is only possible if there is no (user) menu on the screen!
How to Navigate
By means of the “CURSOR-DOWN/UP” knob on the RCtransmitter, can be navigated through the menus
How to Exit CSM
Press “MENU” (or HOME) / “Back” key on the RC-transmitter.
Service Default Mode (SDM)
How to Activate SDM
# Analogue SDM: use the standard RC-transmitter and key in the code “062596”, directly followed by the “MENU” (or HOME) button.
Note: It is possible that, together with the SDM, the main menu will appear. To switch it “off”, push the “MENU”(or HOME) button again.
# Digital SDM: use the standard RC-transmitter and key in the code “062593”, directly followed by the “MENU” (or HOME) button.
Note: It is possible that, together with the SDM, the main menu will appear. To switch it “off”, push the “MENU” (or HOME) button again.
# Analogue SDM can also be activated by grounding for a moment the solder path on the SSB, with the indication “SDM

How to Navigate
When the “MENU” (or HOME) button is pressed on the RC transmitter, the TV set will toggle between the SDM and the normal user menu.
How to Exit SDM
Use one of the following methods:
# Switch the set to STAND-BY via the RC-transmitter.
# Via a standard customer RC-transmitter: key in “00”- sequence
Fault Finding and Repair Tips
Ambilight
Due to degeneration process of the LED’s fitted on the ambi module, there can be a difference in the colour and/or light output of the spare ambilight modules in comparison with the originals ones contained in the TV set. Via SAM => alignments => ambilight, the spare module can be adjusted.
Audio Amplifier
The Class D-IC 7D10 has a powerpad for cooling. When the IC is replaced it must be ensured that the powerpad is very well pushed to the PWB while the solder is still liquid. This is needed to insure that the cooling is guaranteed, otherwise the Class DIC could break down in short time.
CSM
When CSM is activated and there is a USB stick connected to the TV, the software will dump the complete CSM content to the USB stick. The file (Csm.txt) will be saved in the root of the USB stick. If this mechanism works it can be concluded that a large part of the operating system is already working (MIPS, USB...)
DC/DC Converter
Description basic board
The basic board power supply consists of 4 DC/DC converters and 5 linear stabilisers. All DC/DC converters have +12V input voltage and deliver :
# +1V1 supply voltage (1.15V nominal), for the core voltage of PNX85500, stabilised close to the point of load; SENSE+1V1 signal provides the DC-DC converter the needed feedback to achieve this.
# +1V8 supply voltage, for the DDR2 memories and DDR2 interface of PNX85500.
# +3V3 supply voltage (3.30V nominal), overall 3.3 V for onboard IC’s, for non-5000 series SSB diversities only.
# +5V (5.15V nominal) for USB, WIFI and Conditional Access Module and +5V5-TUN for +5V-TUN tuner stabiliser.
The linear stabilisers are providing:
# +1V2 supply voltage (1.2V nominal), stabilised close to
PNX85500 device, for various other internal blocks of PNX85500; SENSE+1V2 signal provides the needed feedback to achieve this.
# +2V5 supply voltage (2.5V nominal) for LVDS interface and various other internal blocks of PNX85500; for 5000 series SSB diversities the stabiliser is 7UD2 while for the other diversities 7UC0 is used.
# +3V3 supply voltage (3V3 nominal) for 5000 series SSB diversities, provided by 7UD3; in this case the 12V to 3V3 DC-DC converter is not present.
3 +5V-TUN supply voltage (5V nominal) for tuner and IF amplifier. +3V3-STANDY (3V3 nominal) is the permanent voltage, supplying the standby microprocessor inside PNX85500. Supply voltage +1V1 is started immediately when +12V voltage becomes available (+12V is enabled by STANDBY signal when
“low”). Supply voltages +3V3, +2V5, +1V8, +1V2 and +5V-TUN are switched “on” by signal ENABLE-3V3 when ‘low”, provided that +12V (detected via 7U40 and 7U41) is present. +12V is considered OK (=> DETECT2 signal becomes “high”, +12V to +1V8, +12V to +3V3, +12V to +5V DC-DC converter can be started up) if it rises above 10V and doesn’t drop below 9V5. A small delay of a few milliseconds is introduced between the start-up of 12V to +1V8 DC-DC converter and the two other DC-DC converters via 7U48 and associated components. Description DVB-S2:
# LNB-RF1 (0V = disabled, 14V or 18V in normal operation) LNB supply generated via the second conversion channel of 7T03 followed by 7T50 LNB supply control IC.It provides supply voltage that feeds the outdoor satellite reception equipment.
# +3V3-DVBS (3V3 nominal), +2V5-DVBS (2V5 nominal) and +1V-DVBS (1.03V nominal) power supply for the silicon tuner and channel decoder. +1V-DVBS is generated via a 5V to 1V DC-DC converter and is stabilised at the point of load (channel decoder) by means of feedback signal SENSE+1V0-DVBS. +3V3-DVBS and +2V5-DVBS are generated via linear stabilisers from +5V-DVBS that by itself is generated via the first conversion channel of 7T03. At start-up, +24V becomes available when STANDBY signal is “low” (together with +12V for the basic board), when +3V3 from the basic board is present the two DC-DC converters channels inside 7T03 are activated. Initially only the 24V to 5V converter (channel 1 of 7T03 generating +5V-DVBS) will effectively work, while +V-LNB is held at a level around 11V7 via diode 6T55. After 7T05 is initialized, the second channel of 7T03 will start and generates a voltage higher then LNB-RF1 with 0V8. +5VDVBS start-up will imply +3V3-DVBS start-up, with a small delay of a few milliseconds => +2V5-DVBS and +1V-DVBS will be enabled. If +24V drops below +15V level then the DVB-S2 supply will stop, even if +3V3 is still present.