- 4 -
Service Manual
Important safety tests
Measuring H.V.
The anode caps are cemented to the CRTs. To gain
access for high voltage measurement, remove the red
CRT’s anode lead from the flyback transformer
distributor. Grasp the anode lead protective cap at its
bottom and squeeze it against the locking cap body
inside, rotate 1/4 turn counter clockwise and pull the
anode lead sleeve out of the FBT distributor. Connect a
high voltage lead (+) from your H.V. meter to the FBT
distributor, and the common (-) to cold ground (
).
(see figure 2).
Note:
Reinsert
the
anode
lead
into
the
FBT
distributor until it is tightly and fully seated.
Turn the locking cap clockwise to lock in place.
(EHT) Protector operation check
With the cabinet back removed, apply a nominal 120V
AC to the PTV.
Over voltage test
Preparation:
1.
Turn PTV “OFF”
2.
Connect
a
NTSC
signal
generator
to
the
antenna terminal.
3.
Connect DVM (+) TPD50 and (-) TPD51 on
D Board (see figure 4)
Figure 3. Measuring H.V.
4.
Connect a H.V. meter (static type, class 0.1) with
high voltage leads to high voltage distributor
on FBT. (See figure 4)
Figure 4. DVM & power supply connection.
5.
Connect the 15 ~ 25 V DC variable power supply to
(+) TPD8 or IC802 pin 2 (D-Board) and (-) heat
sink of Q551 (see figure 4).
Procedures:
1.
Apply a NTSC white pattern.
2.
Turn PTV ON.
3.
Adjust the picture or brightness controls so that the
DVM reads 12.4 volts ± 0.4 volts.
4.
Increase the variable power supply until set turns
off. The set should turn off at 12.4 volts ± 0.4 volts
(DVM) and high voltage less than 36.4kV.
5.
If the DVM reading is other than 12.4 volts (± 0.4
volts), readjust picture or brightness control and
repeat steps 3.
6.
Turn off the variable supply and confirm that the set
will turn on with the remote control.
Figure 2. Removal of FBT leads
FBT distributor
Anode lead
Grasp protective
rubber cap
Push & rotate
cap counter-
clockwise
to remove
Discharge to
CRT chassis
3
1
2
-
+
H.V. METER
FBT Distributor
CRT
CHASSIS
Cold ground
-
+
DVM
TPD51 TPD50
D-Board
Variable
power
supply
(15~25DC)
(+)
(-)
IC802 PIN 2
HEAT SINK OF Q551
MA150
D-Board
100
Ω
1/2 W
OR TPD8
Summary of Contents for PT47WX52F - 47" PROJECTION TV HD
Page 65: ... 65 Notes PARTS LIST ...
Page 66: ... 66 D Board Schematic ...
Page 67: ... 67 D Board Schematic ...
Page 68: ... 68 D Board Schematic ...
Page 69: ... 69 Jumper between pin 7 and pin 1 D Board Schematic ...
Page 70: ... 70 D Board Schematic ...
Page 71: ... 71 D Board Schematic ...
Page 73: ... 73 NOTES NOTES ...
Page 74: ... 74 D Board Layout ...
Page 75: ... 75 D Board Layout ...
Page 76: ... 76 A Board Schematic ...
Page 77: ... 77 A Board Schematic ...
Page 78: ... 78 A Board Schematic ...
Page 79: ... 79 A Board Schematic ...
Page 80: ... 80 A Board Schematic ...
Page 81: ... 81 A Board Schematic ...
Page 82: ... 82 A Board Schematic ...
Page 83: ... 83 A Board Schematic ...
Page 84: ... 84 Board section Top A Board Layout Top left portion ...
Page 85: ... 85 Board section Top A Board Layout Top right portion ...
Page 86: ... 86 Board section Top A Board Layout Bottom left portion ...
Page 87: ... 87 Board section Top A Board Layout Bottom right portion ...
Page 88: ... 88 Board section Bottom side A Board Layout Top left portion ...
Page 89: ... 89 Board section Bottom A Board Layout Top right portion ...
Page 90: ... 90 Board section Bottom A Board Layout Bottom left portion ...
Page 91: ... 91 Board section Bottom A Board Layout Bottom right portion ...
Page 92: ... 92 LG Board schematic TNP2AA112 LG Board schematic ...
Page 94: ... 94 LR Board schematic TNP2AA111 LR Board schematic ...
Page 96: ... 96 LB Board schematic TNP2AA110 LB Board schematic ...
Page 98: ... 98 K Board schematic TNP2AA089 K Board layout TNP2AA089 K Board schematic and layout ...
Page 99: ... 99 G Board schematic TNP2AA090 G Board layout TNP2AA090 G Board schematic and layout ...
Page 104: ...Printed in USA K02042127PL0429 ...