KE-50XS910 (serv.man2) - Sony TV Service Manual (repair manual)

PDP Module Name

UC Model

PDU-50WX4S

CONTENTS

1. SAFETY INFORMATION ..................................................................................................................................1
2. EXPLODED VIEWS AND PARTS LIST ............................................................................................................5

2.1 CHASSIS SECTION (1) .............................................................................................................................5
2.2 CHASSIS SECTION (2) .............................................................................................................................7
2.3 FRAME SECTION ......................................................................................................................................9
2.4 PANEL CHASSIS (50) Assy (AWU1087)..................................................................................................11

2.4.1 PACKING FOR REPLACING SERVICE PANEL ................................................................................11
2.4.2 PANEL CHASSIS (50) Assy (AWU1087) Parts List ...........................................................................12

3. BLOCK DIAGRAM AND WAVE FORMS ........................................................................................................13

3.1 BLOCK DIAGRAM....................................................................................................................................13

3.1.1 OVERALL BLOCK DIAGRAM............................................................................................................13
3.1.2 50 Y DRIVE ASSY .............................................................................................................................15
3.1.3 50 X DRIVE ASSY .............................................................................................................................16
3.1.4 INTERFACE ASSY.............................................................................................................................17
3.1.5 DIGITAL VIDEO ASSY .......................................................................................................................22

3.2 WAVE FORMS .........................................................................................................................................24

4. INSTALLATION OF POWER SUPPLY UNIT FOR SERVICE JIG ...................................................................29
5. ADJUSTMENT ................................................................................................................................................30

5.1 ADJUSTMENT REQUIRED WHEN THE SET IS REPAIRED OR REPLACED .......................................30
5.2 COMMAND...............................................................................................................................................30

5.2.1 RS232C COMMAND..........................................................................................................................30

6. GENERAL INFORMATION .............................................................................................................................36

6.1 DIAGNOSIS..............................................................................................................................................36

6.1.1 PCB LOCATION.................................................................................................................................36
6.1.2 DIAGNOSIS OF SHUTDOWN/POWER-DOWN INDICATED BY LEDS ............................................37
6.1.3 POWER ON/OFF FUNCTION FOR THE LARGE-SIGNAL SYSTEM ...............................................42
6.1.4 VSUS, VADR ELECTRICAL DISCHARGE METHOD ........................................................................42
6.1.5 BACKING UP THE ADJUSTMENT VALUES FOR THE MAIN UNIT .................................................43
6.1.6 METHOD OF ADJUSTMENT WHEN REPLACING THE SERVICE PANEL (AWU1087) ..................45

6.2 IC INFORMATION ....................................................................................................................................47

7. THE PARTS INFORMATION ...........................................................................................................................51

 

1

NOTICE
(FOR CANADIAN MODEL ONLY)
Fuse symbols              (fast operating fuse) and/or               (slow operating fuse) on PCB indicate that replacement parts 
must be of identical designation.

REMARQUE
(POUR MODÈLE CANADIEN SEULEMENT)
Les symboles de fusible               (fusible de type rapide) et/ou               (fusible de type lent) sur CCI indiquent que les pièces 
de remplacement doivent avoir la même désignation.

NOTICE : Comply with all cautions and safety related notes 

located on or inside the cabinet and on the chassis. 

The following precautions should be observed :
1. When service is required, even though the PDP UNIT an 

isolation transformer should be inserted between the power line 
and the set in safety before any service is performed.

2. When replacing a chassis in the set, all the protective devices 

must be put back in place, such as barriers, nonmetallic knobs, 
adjustment and compartment covershields, isolation resistor-
capacitor, etc.

3. When service is required, observe the original lead dress. Extra 

precaution should be taken to assure correct  lead dress in the 
high voltage circuitry area.

4. Always use the manufacture's replacement components. 

Especially critical components as indicated on the circuit 
diagram should not be replaced by other manufacture's.

  Furthermore where a short circuit has occurred, replace those 

components that indicate evidence of overheating.

5. Before returning a serviced set to the customer, the service 

technician must thoroughly test the unit to be certain that it is 
completely safe to operate without danger of electrical shock, 
and be sure that no protective device built into the set by the 
manufacture has become defective, or inadvertently defeated 
during servicing. Therefore, the following checks should be 
performed for the continued protection of the customer and 
servicetechnician.

6. Perform the following precautions against unwanted radiation 

and rise in internal temperature.

 • Always return the internal wiring to the original styling.
 • Attach parts (Gascket, Ferrite Core, Ground, Rear Cover, 

Shield Case etc.) surely after disassembly.

7. Perform the following precautions for the PDP panel.
 • When the front case is removed, make sure nothing hits the 

panel face, panel corner, and panel edge (so that the glass does 
not break).

 • Make sure that the panel vent does not break. (Check that the 

cover is attached.)

 • Handle the FPC connected to the panel carefully.

Twisting or pulling the FPC when connecting it to the 
connector will cause it to peel off from the panel.

8. Pay attention to the following.
 • When the front case is removed, infrared ray is radiated and 

may disturb reception of the remote control unit.

 • Pay extreme caution when the front case and rear panel are 

removed because this may cause a high risk of disturbance to 
TVs and radios in the surrounding.

 

2

With the AC plug removed from an AC power source, place a 
jumper across the two plug prongs. Turn the AC power switch on. 
Using an insulation tester (DC 500V), connect one lead to the 
jumpered AC plug and touch the other lead to each exposed metal 
part (input/output terminals, screwheads, metal overlays, control 
shafts, etc.), particularly any exposed metal part having a return 
path to the chassis. Exposed metal parts having a return path to 
the chassis should have a minimum resistor reading of 0.3M

Ω 

and a maximum resistor reading of 5M

Ω. Any resistor value 

below or above this range indicates an abnormality which 
requires corrective action. Exposed metal parts not having a 
return path to the chassis will indicate an open circuit.

Plug the AC line cord directly into an AC power source (do not 
use an isolation transformer for this check). 
Turn the AC power switch on.
U s i n g   a   " L e a k a g e   C u r r e n t   Te s t e r   ( S i m p s o n   M o d e l   2 2 9  
equivalent)", measure for current from all exposed metal parts of 
the cabinet (input/output terminals, screwheads, metal overlays, 
control shaft, etc.), particularly any exposed metal part having a 
return path to the chassis, to a known earth ground (water pipe, 
conduit, etc.).  Any current measured must not exceed 0.5mA.

Many electrical and mechanical parts in PIONEER set have 
special safety related characteristics. These are often not evident 
from visual inspection nor the protection afforded by them 
necessarily can be obtained by using replacement components 
rated for higher voltage, wattage, etc. Replacement parts which 
have these special safety characteristics are identified in this 
Service Manual.
Electrical components having such features are identified by 
marking with a     on the schematics and on the parts list in this 
Service Manual.
The use of a substitute replacement component which dose not 
h a v e   t h e   s a m e   s a f e t y   c h a r a c t e r i s t i c s   a s   t h e   P I O N E E R  
recommended replacement one, shown in the parts list in this 
Service Manual, may create shock, fire or other hazards.
Product Safety is continuously under review and new instructions 
are issued from time to time. For the latest information, always 
consult the current PIONEER Service Manual. A subscription to, 
or additional copies of, PIONEER Service Manual may be 
obtained at a nominal charge from PIONEER. 

Leakage
current
tester

Reading should
not be above
0.5mA

Device
under
test

Test all
exposed metal
surfaces

Also test with
plug reversed
(Using AC adapter
plug as required)

Earth
ground

AC Leakage Test