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Reparacion de fuentes de tv plasma PHILIPS
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Chapter 09 page 1Provided By: Juan Carlos Rodriguez
FTV2.3
POWER SUPPLY
REPAIR METHOD
FTV2.3
POWER SUPPLY
REPAIR METHOD
Chapter 09 page 2Check VS and VA Output Load
SERVICE TIP:If the Vs input of the PDP is short circuited a simple test can be done:Disconnect the set from the mains.Disconnect ALL cables between PSU and PDP.Connect a regulated DC power supply (current limited to 1 A) directly to the Vs input of the YSUS board of the PDP(pin 9 of connector CN 33) and the chassis of the FTV.Ramp-up the voltage slowly to maximal 5 V. If the current increases to 1 A, the PDP is defect.The same can be done for the Vs input on the XSUS board: pin 10 of connector CN 23.
The Va inputs on the various boards can also be checked with the same procedure:The tests must be done on the connectorsCN23: pin 1 (XSUS-board)CN42: pin 1 (ABUSR-board)CN52: pin 1 (ABUSL-board).
SERVICE TIP:If the Vs input of the PDP is short circuited a simple test can be done:Disconnect the set from the mains.Disconnect ALL cables between PSU and PDP.Connect a regulated DC power supply (current limited to 1 A) directly to the Vs input of the YSUS board of the PDP(pin 9 of connector CN 33) and the chassis of the FTV.Ramp-up the voltage slowly to maximal 5 V. If the current increases to 1 A, the PDP is defect.The same can be done for the Vs input on the XSUS board: pin 10 of connector CN 23.
The Va inputs on the various boards can also be checked with the same procedure:The tests must be done on the connectorsCN23: pin 1 (XSUS-board)CN42: pin 1 (ABUSR-board)CN52: pin 1 (ABUSL-board).
The next pages explains how to repair the power supply outside theset, with fictive loads
Chapter 09 page 3Repair The Power Supply Out the Set
Short circuit On/Off switch, pin 1 and 2 connector 319.
Connect VCEGO (p13) and VSAGO (p15) of CN307 to a +2,5V from the +3,3v STBY SW.
For a regulated output voltage, connect test point VRS (pin 7) and VRA (pin 9) of CN307 to + 1V.Connect to the two solder island near connector 307 (flex foil connector).
Load +3,3V stby with 15 Ohm resistor (I must be 0,2A).
Load Vs with Lamp on CN323 pin 10. (lamp220V/75W I =176mA (82,3V))
Vs Min load between 0,1 to 0,5A, Max load = 0,5A
Load VA with lamp on CN 323 pin 1. (lamp 220V/100W I = 200mA (53,6V))
VA Min load between 0,1A to 0,5A Max load = 2A
Load Vcc (5V) with resistor 8,2 Ohm, the Max load for VCC = 7A.
Load 3V3 with resistor 3,3 Ohms or 1,5 Ohm
Connect power supply to mains, by connector 308.
Short circuit On/Off switch, pin 1 and 2 connector 319.
Connect VCEGO (p13) and VSAGO (p15) of CN307 to a +2,5V from the +3,3v STBY SW.
For a regulated output voltage, connect test point VRS (pin 7) and VRA (pin 9) of CN307 to + 1V.Connect to the two solder island near connector 307 (flex foil connector).
Load +3,3V stby with 15 Ohm resistor (I must be 0,2A).
Load Vs with Lamp on CN323 pin 10. (lamp220V/75W I =176mA (82,3V))
Vs Min load between 0,1 to 0,5A, Max load = 0,5A
Load VA with lamp on CN 323 pin 1. (lamp 220V/100W I = 200mA (53,6V))
VA Min load between 0,1A to 0,5A Max load = 2A
Load Vcc (5V) with resistor 8,2 Ohm, the Max load for VCC = 7A.
Load 3V3 with resistor 3,3 Ohms or 1,5 Ohm
Connect power supply to mains, by connector 308.
Chapter 09 page 4Output Connectors
CN319 P3 CN307 P3CN333 and CN323 P7
Pin 9
Power OK
P3P7
VCEGO 2,5VVSAGO 2,5V VRA & VRS 1V
Chapter 09 page 5Flow Chart Overview Check Points
Check +V standby power supply, + 3,3V and +5V stby on CN319.Check +V standby power supply, + 3,3V and +5V stby on CN319.
Check +Vs switched output voltage on pin 8,9,10 CN323 or pin 7,8,9 CN333 around 80……85VCheck +Vs switched output voltage on pin 8,9,10 CN323 or pin 7,8,9 CN333 around 80……85V
Check + Va output voltage on pin 1 CN323 = around 50….55VCheck + Va output voltage on pin 1 CN323 = around 50….55V
Check Preconditioner +395V on fuse1004.Check Preconditioner +395V on fuse1004.
Check + Va output voltage on pin 1 CN323 = around 50….55V
Check + Vcc output voltage on pin 1 CN333 = 5,2VCheck + Vcc output voltage on pin 1 CN333 = 5,2V
Check + 3V3 output voltage on pin 8,9,10,11,12 of CN305 = 3,3VCheck + 3V3 output voltage on pin 8,9,10,11,12 of CN305 = 3,3V
Check Power OK line on pin 9 CN319, must be high (4,5V).Check Power OK line on pin 9 CN319, must be high (4,5V).
Chapter 09 page 6Switched Standby Voltages
+5V Stby out +3,3V Stby out
Minimum load for the +3,3V switched Stby supply
is about 0,2A or 16 ohm
P2
Chapter 09 page 7Standby Supply Is Not Correct ?
Check V on
drain IC7500?
Fus.1400,
D6512, D6513, R3506
<100V
>100V
Conditions for normal operating mode of the Stby supply;
Load is about 200mA on the 3,3V output
Fus.1400,
D6512, D6513, R3506Pin 1 IC7500 = 5,8V ?
Check secondary part
Short circuit and
Control loop
Check also
the +25V Hot from Stby PS
Reference is primary groundP2
Chapter 09 page 8Check Preconditioner
Drain T7610
P5
Pin 11 Gate
Pin 13 oscil.Preconditioner output
Fuse 9004 = 395V
Chapter 09 page 9Check Preconditioner
Output of D6600 =255V
V start-up pin 16 IC7650 = 395V
Check on IC7650
•Pin 12 Vcc = 14,5V
•Pin 1 Vref = 5V
•Pin 13 Oscilator
In normal working conditionsoutput of preconditioner = 395V on
fuse 1004
Tip, it is also possible to checkthe preconditioner without load
by removing fuse 1004
Check on IC7650
•Pin 12 Vcc = 14,5V
•Pin 1 Vref = 5V
•Pin 13 Oscilator
Pin 11 Gate
Voltage feedback pin 3 VFB =5V
Current sense pin 6 CS
Check +25V Hot
preconditioner output = 24,5V
Tip, it is also possible to checkthe preconditioner without load
by removing fuse 1004
P5
Chapter 09 page 10Start up Conditions LLC Supply
Standby supply is switched on and is in continous mode, 3,3V and 5V standby are OK
VCEGO and VSAGO are connected to 2,5V
T7352 conducts, T7348 is blocked
T7391 is blocked, T73993 is blocked
Supply_on line = H and T7460, T7465 and T7470 conducts
Check Load on standby supply
Check latch, Thy6348 must be blocked,
If not check protection part P3
Diagram P3
Diagram P2
Diagram P2
P2
P3
25V_Hot Standby Supply is OK
SW25V_Hot from preconditioner is OK
Relay 1450 & 1460 is closed
395V Preconditioner is OK
Ic7093 provide current to pin 15 control IC7001 LLC supply
Check +16V provided by Ic7093
Oscillator and OA/OB Ic7001
Diagram P5
Diagram P6
P5
P6
Chapter 09 page 11Check Vs Supply (LLC)
LLC control IC Bias supply IC7093 Primary ground
2
P6
+Vs switched
on pin 10 CN323
Vs=70+10Vrs
= around 80 …85V
4
Pin 3 and 6 T5002
or C2011/C2017
Chapter 09 page 12Check LLC Supply Control Part IC7001
Start up conditions +25v HOT from stbysupply and SW25V Hot from
preconditionner are OK?
Check DC voltages IC7001 Pin
•15 Vcc = 16,5V
•5 Vref = 5,1V
•10 Fault input = 0V
Check DC voltages IC7001 Pin
•15 Vcc = 16,5V
•5 Vref = 5,1V
•10 Fault input = 0V
Check by oscilloscope IC7001 Pin
1 Oscil, drive output 14 OA, 12 OB
P6
If LLC control part does´n start upcheck with external DC power
supply, see next page
Chapter 09 page 13Check LLC Control Part, With External DC Power Supply
Connect a external DC power supply
The + to the output of IC7093 (metal part), - to primary ground on cooling plate LLC
Oscilloscope is connected to oscillator pin 1
Adjust the current output of the external DC power supply to 100mA max
Adjust the output voltage to 16V
Control Ic is starting up at 16V, current = 70mA
Check oscillator, One shot timer
OA and OB
Grid Ts7005, Ts7006
See voltages and oscillogrammes next pageP6
Chapter 09 page 14LLC Supply Control Part
17V
oscil
One shot
OA
4,3V
2,7V
IC7001
MC34067PRef 5,1V
4,9V
OB
1,8V
4,9V
4,9V
0,6V
IC7001
MC34067P
P6
Chapter 09 page 15VS Switch & Sequence Discharge Circuit
Start Up Sequence
LLC has started
Pulses are aligned and rectified by D6054 & D6055
Power OK line is H T7058 conducts
Switch Off Sequence
LLC is switched off
Or +5V standby is switched off
Or Power OK line drops
VS drops & Power OK Line will drop
VSA_Control Line will be High
T7050 conducts
Vs is switched
VSA_Control is Low
T7059 & T7052 are blocked
VSA_Control Line will be High
T7058 will block
T7059 conducts
T7050 blocks
T7052 conducts andVS is directly discharged,while VA is discharged if VS is lower than VA
P7
Chapter 09 page 16Sart Up Conditions VA Supply
LLC supply has started up and Vs unsw. 77V…95V from LLC is OK
VSAGO is connconnected to +2,5V
T7376 and T7375 conducts
VSA_control line is Low, T7134 is blocked
Vs_unsw = OK, T7375coducts
Diagram P3
Digram P7
P3
VSA_control line is Low, T7134 is blocked
Start up current is provided byT7110, T711 and from Drain
Ic7112 to pin 1 VCC
Start up VA
Check also T7058
Power OK line will beH but with some delay
P7
Chapter 09 page 17Check VA Supply
VA DC output pin 1 CN323Drain T7117
VA Control Ic7112
CN323
1 +VA on pin 1 CN323
Va=30+20Vra
= around 50…..55V.
P7
Chapter 09 page 18VCC Supply Start up Conditions
LLC is OK
CN307 pin 13 VCEGO=2,5V
Ts7352 conducts, Ts7351 is blocked
Diagram P3
Diagram P7
P3
VCC_Go and +18V LLC are on H level
T7200 conducts and provide start up curent
Start up current is provided by Drain Ic7212
Diagram P7
P7
Chapter 09 page 19VCC Output Voltage
Check +VCC = 5,2V
or pin 3 CN323
Grid T7217 Drain 7217
3
CN323
Control IC7712
CN323
P7
Chapter 09 page 203V3 Start up Conditions
+18V from LLC supply is OK
IC7260 VCC pin 7 & 8 = 17V
3V3 OVP is Low, Thy6260 is blocked
Diagram P6
Diagram P7
3V3 OVP is Low, Thy6260 is blocked
Check Oscillator pin 1
Check 3,3V OVP
T7389 & IC7330C
P7
Chapter 09 page 213,3V Supply
Oscillator Pin1 Output Pin2/3 3V3 outputPin 9 BootPin 17 SS
P7
Chapter 09 page 223V3 Power Supply Repair With External DC Power Supply
Connect an external DC power supply on C2261 and adjustthe output to 19V, limit the current to 700mA max.
Check the output voltage 3,3V ?
Oscillator pin 1
Vcc = 19V
Pin 16 = 5,1V.
Pin 17 SS = 18V
Pin 11 = 0,7V
Pin 12 = 3,2V (if power supply is OK)
Check if there is no short circuit on the output.
Oscillator pin 1
Vcc = 19V
Pin 16 = 5,1V.
Pin 17 SS = 18V
Pin 11 = 0,7V
Pin 12 = 3,2V (if power supply is OK) P7
Chapter 09 page 23Alignment Vs and Va After Power Supply Repair
VA adjust R3127
After repair the +Vs and +VA must beadjusted
VS and VA test connector
VS adjust
Chapter 09 page 24Additional Info For Power Supply Alignment
Please keep in mind that in case of the following combinations between PSU's and PDP's no oralmost no alignments are needed of the Vs and Va:
PDP with only the Vs feedback loop (-52 in type number of PDP) in combination with the .3 PSU: Keep theSW feedback loop OFF and align both the Vs and Va as described in the Service manual.
PDP with only the Vs feedback loop (-52 in type number of PDP) in combination with the .3 PSU withprecision resistors: The SW feedback loop can be switched on and then the Va has to checked and alignedwith an accuracy of +/- 1,5V and the potentio meter of the Vs should be positioned in the middle. No furtheralignments needed.
PDP with only the Vs feedback loop (-52 in type number of PDP) in combination with the .4 PSU: Switch onthe SW feedback loop and no further alignments are needed.
PDP with the Vs & Va feedback loop (a "B" in the type number of PDP) in combination with the .3 PSU: Keepthe SW feedback loop OFF and align both the Vs and Va as described in the Service manual.
PDP with the Vs & Va feedback loop (a "B" in the type number of PDP) in combination with the .3 PSU withprecision resistors: Switch on the SW feedback loop and no further alignments are needed.
PDP with the Vs & Va feedback loop (a "B" in the type number of PDP) in combination with the .4 PSU:Switch on the SW feedback loop and no further alignments are needed.
The SW feedback loop can be found in the SAM menu.
Please keep in mind that in case of the following combinations between PSU's and PDP's no oralmost no alignments are needed of the Vs and Va:
PDP with only the Vs feedback loop (-52 in type number of PDP) in combination with the .3 PSU: Keep theSW feedback loop OFF and align both the Vs and Va as described in the Service manual.
PDP with only the Vs feedback loop (-52 in type number of PDP) in combination with the .3 PSU withprecision resistors: The SW feedback loop can be switched on and then the Va has to checked and alignedwith an accuracy of +/- 1,5V and the potentio meter of the Vs should be positioned in the middle. No furtheralignments needed.
PDP with only the Vs feedback loop (-52 in type number of PDP) in combination with the .4 PSU: Switch onthe SW feedback loop and no further alignments are needed.
PDP with the Vs & Va feedback loop (a "B" in the type number of PDP) in combination with the .3 PSU: Keepthe SW feedback loop OFF and align both the Vs and Va as described in the Service manual.
PDP with the Vs & Va feedback loop (a "B" in the type number of PDP) in combination with the .3 PSU withprecision resistors: Switch on the SW feedback loop and no further alignments are needed.
PDP with the Vs & Va feedback loop (a "B" in the type number of PDP) in combination with the .4 PSU:Switch on the SW feedback loop and no further alignments are needed.
The SW feedback loop can be found in the SAM menu.
Chapter 09 page 25
End of the repair methodpresentation
End of the repair methodpresentation
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