Safety regulations require the following during a repair:
·
Connect set to the Mains/AC Power via an isolation
transformer(>800VA)
·
Replace safety components,indicated by the symbol ,
only by components identical to the original ones.Any
other component substitution(other than original type)may
increase risk of fire or electrical shock hazard
Safety regulations require that after a repair,the set must
be returned in its original condition.pay in particular
attention to the following points:
·
Route the wire trees correctly and fix them with the
mounted cable clamps.
·
Check the insulation of the Mains/AC power lead
for external damage.
·
Check the strain relief of the Main/AC power cord
for proper function.
Check the electrical DC resistance between the pins of
·
the Mains/AC Power plug and secondary side(only for
sets that have a Mains/AC power isolated poer supply):
1. Unplug the Mains/AC Power cord and connect a wire
between the two pins of the Mains/AC power plug.\
2.Set the Mains/AC Power switch to the ON position
(keep the Mains/AC Power cord unplugged!)
3.Measure the resistance value between the pins of the
Mains/AC Power plug and the metal shielding of the
tuner or the aerial connection on the set.The reading
should be between 4.5 Mohm and 12 Mohm.
4.Switch OFF the set,and remove the wire between
Check the cabinet for defects,to prevent touching of any inner
·
parts by the customer.
""
the two pins of the Mains/AC plug.
""
·
Where necessary,measure the waveforms and voltages with()
and without( )aerial signal.Measure the voltages in the power
supply section both in normal operation( ) and in stand-by( ).
These values are indicated by means of the approprate symbols.
·
The semiconductors indicated in the circuit diagram and in the
parts lists,are interchangeable per position with the
semiconductors in the unit,irrespective of the type indication
on these semiconductors.
Manufactured under license from Dolby Laboratories. Dolby ,
·
""""
Pro Logic and the double-D symbol ,are trademarks of Dolby
laboratories.
!
2.3.2 Schematic Notes
·
All resistor values are ohms,and the value multiplier is often used
to indicate the decimal point location(e.g. 2K2 indicates 2.2 kohm).
·
Resistor values with no munltiplier may be indicated with either an
""""
E or an R (e.g.220E or 220R indicates 220 ohm).
·
All capacitor values are given in micro-farads(u=x10 ),nanofarads9n=x10 ),or pico-farads(p=x10 ).
·
Capacitor values may also use the value multiplier as the decimal
point indication(e.g. 2p2 indicates 2.2 pF).
·
""
An asterisk (*) indicates component usage varies.Refer to the
diversity tables for the correct values.
·
The correct component values are listed in the Spare Parts List.
Therefore,always check this list when there is amy doubt.
2.3.3 Lead-free Solder
Philips CE is producing Lead-free sets (PBF) from 1.1.2005
onwards.
Idntification:The bottom line of a type gives a 14-digit serial
number.Digial 5 and 6 refer to the production year,digits 7 and
8 refer to production week( inexample below it is 2007 week14)
-9
-12
""
-6
MODEL ID.20PFL4122/93
2.2 Warnings
·
All ICs and many other semiconductors are susceptible to
electrostatic discharges(ESD ).Careless handling during
repair can redure life drastically.Make sure that,during repair,
you are connected with same potential as the mass of the set
by wristband ith resistance .Keep components and tools also
at this same potential.Available EDS protection equipment:
Be careful suring measurements in the high voltage section.
·
Never replace modues or other components while the unit
is switched ON .
·
When you align the set,use plastic rather than metal tools.This
will prevent any shurt circuits and danger of a circuit becoming
unstable.
2.3 Notes
2.3.1 General
Measure the voltages and waveforms with regard to the chassis
·
(=tuner)ground( ),or hot ground( ), depending on the tested area
of curcuitry.The voltages and waveforms shown in the diagrams
are indicative.Measure them in the Service Default Mode(see
chapter 5)with a colour bar signal and stereo sound(L:3 khz,
R:1 kHz unless statedotehrwise)and picture carrier at 475.25
Mhz for PAL,or 61.25 MHZ for NTSC(channel 3).
""
01
0714
0714
Figure 2-1 Serial number example
Regardless of the special lead-free logo(which is not always
indicated),one must treat all sets from this date onwards
according to the rules as described below.
P
Ab
Figure 2-2 Lead-free logo
Due to lead-free technology some rules have to be respected
by the workshop during a repair:
2. Safety Instructions,Warnings and Notes
TPS 1.0A LA
5
Use only lead-free soldering tin Philips SAC305 with
order code 06622 149 00106.If lead-free solder paste
is required please contact the manufacturer of your
soldering equipment.In general,use of solder paste
within workshops should be avioded because paste is not
easy to store and to handle.
Use only adequate solder tools applicable for lead-free
soldering tin.The solder tool must be able:
-To reach a solder-tip temperature of at least 400 C.
-To stabilise the adjusted temerature at the solder-tip
-To exchange solder-tips for different applications.
Adjust your solder tool so that a temperature of around
360 C -380 C is reached and stablilised at the solder joint.
Heating time of the solder-joint should not exceed~4sec.
Aviod temperatures above 400 C,otherwise wear-out of tips
will increase drastically and flux-fluid will be destroyed.
To aviod wear-out of tips,switch”off” unused equipment or
reduce heat.
Mix of lead-free soldering tim/parts with leaded soldering
tin/parts is possible but PHILIPS recommends strongly to
avoid mixed regimes.If this cannot be avoided,carefully
clear the solder-joint from old tin and re-solder with new
tin.
Use only original spare -parts listed in the Service-Manuals.
Not listed standed material(commodities)has to be purchased
at external companies.
For sets produced before 1.1.2005,containing leaded
soldering tin and components,all needed spare parts will
be available till the end of the service period.For the
repair of such sets nothing changes
Alternativ BOM(bill of Materials used for producing the sepcific
model of TV set).It is possible that the same TV model on the
market is produced with e.g. Two different types of displays,
coming from two different O.E.M.s.
By looking at the third digit of the serial number,the serivce
technician can see if there is more than one type of B.O.M. Used
in theproduction of the TV set he is working with.He can used in
the Commercial type Version Number of the TV set
(e.g.20PFL4122/93),after which a screen will appear that gives
information about the number of alternative B.O.M.s used.
If the third digit of serial nuber contains the number 1(example:
AG1B0335000001),then there is only one B.O.M. Version of the
TV set on the market.If tje third digit is a 2(example:
AG2B033500001),then there are two different B.O.M.s.
Information about this is important for ordering the correct spare
parts!
For the third digit,the number 1....9 and the characters A.....Z can
be used,so in total:9 plus 26=35 different B.O.M.s can be indicated
by the third digit of the serial number.
2.3.5 Board Level repair(BLR) or Component Level Repair(CLR)
If a board is defective,consult your repair procedure to decide if
the board has to be exchanged or if it should be repaired on
component level.
If your repair procedure says the board should be exchanged
completely,do not solder on the degective board.Otherwise,it
cannot be returned to the O.E.M. Supplier for back charging!
In case of doubt whether the board is lead-free or not(or
with mixed technologies),you can use the following method:
Always use the highest temperature to solder,when using
SAC305(see also instructions below).
De-solder thoroughly(clean solder joints to avoid mix of
two alloys).
2.3.4 Alternative BOM identification
In September 2005,Philips CE introduced a change in the way
the serial number(or production number,see Figure 2-1)is
composed.From this data on,the third digit in the serial number
(example:AG2B0335000005) indicates the number of the
2.3.6 Practical Service precautions
It makes sense to avoid exposure to electrical shock.
While some sources are expected to have a possible dangerous
impact,others of quite high potential are of limited current and are
sometimes held in less regard.
Always respect voltages.While some may not be dangerous in
themselves,they can cause unexpected reactions that are best
avoided.Before reaching into a powered TV set,it is best to test
the high voltage insulation.It is easy to do,and is a good service
precaution.
6
TPS 1.0A LA
3. Directions for Use
3. Directions for Use
You can download this information from the following websites:
http://www.philips.com/support
http://www.p4c.philips.com
PC Mode
1st Layer2nd Layer3rd Layer4th Layer
Picture
Sound
Features
Color temp
Brightness
Contrast
Auto adjustYes
Manual adjust
Smart sound
Settings
AVL
Normal
Warm
Cool
Phase
Clock
Horizontal
Vertical
Personal
Speech
Music
Movie
Multimedia
Treble
Bass
Balance
OnIncredible surround
Off
On
Off
Install
1st Layer2nd Layer3rd Layer4th Layer5th Layer
PictureSmart picture
Language
Factory reset
Personal
Rich
Nature
Soft
Multimedia
English
Thai (Only /79/98)
Arabic (Only /79/98)
No
Yes
Contrast
Brightness
Color
Sharpness
3. Directions for Use
TPS 1.0A LA
7
Color temp
Picture format
Smart sound
Settings
Timer
Normal
Warm
Cool
4:3
Expand 4:3
Compress 16:9
HD 4:3
Personal
Speech
Music
Movie
Multimedia
Treble
Bass
Balance
OnIncredible surround
Off
OnAVL
Off
Clock
Start time
Stop time
Sleep timer
OnNR
Off
Lock programAuto lock
Change codeEnter New CodeConfirm Code
8
TPS 1.0A LA
Source list
3. Directions for Use
Clear allStart ?
TV
CVI
SIDE AV
PC
DVI
Install
Language
Auto storeStart ?
Manual store
Channel setting
Factory reset
English
Thai (Only /79/98)
Arabic (Only /79/98)
Prog. no
Finetune
Store
Channel edit
Channel swap
Channel sortSort ?
No
Yes
Auto store
Please wait
Prog. found
Frequency
MHzManual store
Start ?
Store ?
Stored
Channel
Skipped
From
To
Exchange
ChannelName edit
Name
Active
Skipped
Exchange ?
Exchanged
Sorting … …
Sort complete
4. Mechanical Instructions
TPS 1.0A LA
9
4. Mechanical Instructions
Index of this chapter:
4.1 Assy/Panel Removal
4.2 Set Re-assembly
4.1 Assy/Panel Removal
Note:Please put your mechine on a soft material to avoid to
scrape panel when you disassemble it.
Front view
Fig.1
Step 2. Remove the Back cover andas Fig.4~5.
a.
Remove the 4 screws, then r.
b. Remove the 5 screws , then remove SHIELD-MAIN as Fig.5.
SHIELD-MAIN
emove the back cover as Fig.4
Fig.4
Back view
Step 1. Remove the Base.
Remove the 4 screws as Fig.3.
Fig.5
Step 3. Remove the Scaler, Power, IR and Key as Fig.6.
a. Remove the 11 screws and disconnect the 6 cables to remove the
scaler board .
b. Remove the 7 screws and disconnect the 3 cables to remove the
Power board.
c. Remove the 2 screws and disconnect the 1 cable to remove the IR
board.
d. Remove the 2 screws and disconnect the 1 cable to remove the Key
board.
Fig.2
Fig.3
Step 4. Remove the speakers andas Fig.7.the Frame assy
Remove the 13 screws to remove the Frame assy as Fig.7.
a.
b Remove the 8 screws to remove the Speaker as Fig.7.
.
Fig.6
10
TPS 1.0A LA
4. Mechanical Instructions
Fig.7
Step 5. Remove Front bezel assy and LVDS cable as Fig.8~9.
Remove the LVDS cable
a.as Fig.8.
b. Remove the Front bezel assy as Fig.9.
Fig.8
Fig.10
Insulation material
4.2 Set Re-assembly
To re-assemble the whole set, execute all processes in reverse
order.
Notes:
a. While re-assembling, make sure that all cables are placed
and connected in their original position.
b. Pay special attention not to damage the EMC foams at the
SSB shielding. Check that EMC foams are put correctly on
their places.
In warranty, it is not allowed to disassembly the LCD panel, even the
backlight unit defect.
Out of warranty, the replacment of backlight unit is a correct way
when the defect is cused by backlight (CCFL,Lamp).
Fig.9
5. Service Modes, Error Codes and Fault Finding
5. Service Modes, Error Codes and Fault Finding
index of this chapter:
5.1 CSM
5.2 Factory Mode
5.
3 Repair Flow Chart
5.1 CSM
It can display CSM windows message when press 1-2 3-6 5-4 on the button (RC) remote control in normal operation mode.
The following information is displayed on screen:
CSM ItemContentsRemark
1:Set type20PFL4122/93Model name
14 digit production-code to be retrieved per
2: Production codeBZ2A0712390037
3: SW-naming main-processor F3 20PFL4122A_V2.00
4: SW-naming extra processor N/A
5: Code 100 00 00 00 00Logging I2C error codes in NVM/EEPROM (5 last logged errors)
6: Code 200 00 00 00 00Logging I2C error codes in NVM/EEPROM (5 first logged errors)
7: Key (HDCP)Invalid
8: NVM-naming24C32 With BDSIf there are different NVM-contents per display-type
set to be written in NVM./EEPROM
F3=family,20PFL4122=model,A=Asia,V=version,
2=SW main version,00=SW sub version
Information whether HDCP-key is valid
TPS 1.0A LA
11
About error code,Please refer to the table below.
Error codeEvent
0x01Audio decoder Error
0x02IIC bus error
0x03Tuner error
0x04NVRAM Error
0x05Scaler Chip error
12
TPS 1.0A LA
5. Service Modes, Error Codes and Fault Finding
5.2 Factory Mode
It can enter Factory Mode
1. Press "062596+Menu" on the button (RC) remote control
as Fig1
2.Choose F3 93 V1.77 71.1 and press"OK"button to enter factory
mode as Fig 2
Fig 1
3. You can find the factory model menu as Fig 3
Fig 2
Fig 3
5.3 Repair flow chart
5. Service Modes, Error Codes and Fault Finding
1.No work/LED is off
TPS 1.0A LA
13
Check if
power switch is
normal
Yes
Check
IR board CN001
pin1=0V,pin2=3.7V,
pin3=3V,pin4=2.85V