Philips PTV500 series Manual de usuario

Philips Consumer

Electronics Company

A Division of North American Philips Corporation In-Home

Service

Guide

Projection Television

PTV500 Series

1993 PTV500 CHASSIS IN-HOME TROUBLESHOOTING GUIDE

CONTENTS

Subjects ............................................................................ Page

SECTION 1

General:

Servicing and Safety Precautions ................................... 3

Introduction ..................................................................... 4

Signal Flow ..................................................................... 5

PTV Power Supply Module ............................................. 6

Shutdown Circuitry .......................................................... 7

SECTION 2

Troubleshooting the PTV System:

Access ............................................................................ 9

Diagnostic LEDs of the Power Supply ............................ 9

Deflection Failures, Video Blanking,

and High Voltage Shutdown .......................................... 10

Video Troubles ................................................................ 11

SECTION 3

In-Home Adjustments:

Ground Connections For Test Equipment ....................... 12

Unless Otherwise Specified: ........................................... 12

On-Screen Menu Positioning .......................................... 12

RF AGC Delay ................................................................ 12

VCO & AFT Adjustment .................................................. 13

Sound Alignment ............................................................ 14

Sub-Contrast Alignment .................................................. 14

Comb Filter Alignment .................................................... 14

Sub-Brightness Adjustment ............................................ 14

Dynamic Gamma ............................................................ 15

High Voltage Frequency Adjustment .............................. 15

Video Level Alignment .................................................... 15

Vertical Height Adjustment .............................................. 16

Vertical Blanker Adjustment ............................................ 16

130Vdc Adjust ................................................................. 16

Stereo Decoder Alignments ............................................ 17

Composite Input Level Adjustment ................................. 17

Stereo DBX Filter ............................................................ 17

Pilot VCO Adjustment ................................. :.; ................. 17

300Hz Separation ........................................................... 18

3kHz Separation ............................................................. 18

Focus Adjustments (Electrical and Optical) ........ i........... 18

Screen (G2) Adjustment Procedure ................................ 19

Gray Scale Tracking,

Sub-Brightness Adjustment Procedure ........................... 20

Screen Geometric And Centering Adjustments .............. 21

Green Screen Geometry Adjustments ............................ 22

Blue Screen Convergence Procedure ............................ 22

Red Screen Convergence Procedure ............................. 23

Programming Factory Default Values ............................. 25

Test Mode Entry and Exit ................................................ 25

Adjustment of Registers in Test Mode ............................ 25

Description of Test Mode "C". ......................................... 26

System Information/Diagnostics ..................................... 27

SECTION 4

Figure 2 -

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

.Figure 8

Figure 9

Simplified Drawings:

Figure 1 - PTV510 Frontview .......................................... 29

PTV510 Rearview .......................................... 30

PTV520 Frontview .......................................... 31

PTV520 Rearview .......................................... 32

PTV535 Frontview .......................................... 33

PTV535 Rearview .......................................... 34

PTV500 72 Degree Light Path ....................... 35

PTV500 Block Diagram .................................. 36

PTV500 Power Supply Module

Block Diagram ................................................................ 37

Figure 10 - PTVS00 Power Supply Connections ............ 38

Figure 11 - PTV500 Shutdown Circuitry .......................... 39

Figure 12 - PTV500 Signal/Deflection Module Layout....40

Figure 13 - PTV500 Cable Connections ......................... 41

Figure 14 - PTV500 Customer Keyboard & IR Receiver

Connections .................................................................... 42

Figure 15 - PTV500 Jack Panel Connections ................. 43

Figure 16 - PTVS00 Automatic Volume Level Control ....44

Figure 17 - PTV500 CRT Connections ........................... 45

Figure 18 - PTV510 Simplified Diagram ......................... 46

SECTION 1

Servicing And Safety Precautions

Always use safe servicing procedures:

1. Use an Isolation Transformer when servicing the Projection

Television to protect both the set and test equipment.

2. Be careful of shock hazard when operating the set with the

back removed.

3. When servicing the CRTs, always wear safety glasses. Be

careful when handling liquid cooled CRTs to protect the over-

flow bellows.

4. Do not remove solid state devices while the set is turned On.

5. Be careful that the correct Ground Reference is used when

making measurements.

6. Be certain that all grounds, ground straps, and wires are

properly connected to protect the set and user from shock.

7. Always check for shock hazards after completion of chassis

repairs. Refer to Service Manual 7524 for proper "Safety

Check" procedures.

8. The 160Vdc Source is present and the Standby Power

Supply is running on the Power Supply Module anytime the

set is connected to an AC Power Source.

In-Home Recommended Test Equipment:

1. Isolation Transformer (Not required when using a hand held

DVM)

2. DVM (High Impedance)

3. Pattern Generator (RF and Video)

4. Two pairs of jumpers

Introduction

The 1993 Projection Television (PTV) comes in three basic con-

figurations, the PTV510, PTV520, and PTV535 Series (see

Figures 1 through Figure 6 in Simplified Drawings section).

Figure 7 shows the new 72 degree light path. The CRT's are

90 degree Hitachi tubes which are matched to Delta 25 Lens.

These sets feature a stand-alone, high-end single board chassis

design for signal and high voltage circuits. The new board is

called the Signal/Deflection/High Voltage Module. A separate

basic Power Supply Module is located to the right of the main

Printed Circuit Board (PCB). Other feature differences in these

sets include Color MDPIP (Picture-in-Picture), AVIO (Audio-

Video-Input-Output) Jack Panel, CCD Comb Filter, Closed-

Caption Module, Automatic Volume Level Module (not in all

Models), and many Audio System options.

The new PTV features the TS-3D Tuning System (Figure 8).

The TS-3D Tuning System is an On-Screen, Total Remote,

Menu Driven Tuning System. The Tuning System is mounted

on the Signal/Deflection/High Voltage Module. The

Microcomputer for the Tuning System communicates via an 12C

Bus with the DAC IC, RF Switcher (optional), U/V Tuner, AVIO

Jack Panel, MDPIP Module, Closed-Caption Decoder Module,

and Convergence Panel.

Dedicated Serial Data and Serial Clock lines (SDA1 AND SCL1)

communicate with the Clock/Calendar and EEPROM IC's. The

Clock/Calendar and EEPROM IC's are used by the Tuning

System to store information needed later. The DAC (Digital-to-

Analog Convertor) IC receives serial digital data from the

Microcomputer and converts it into analog information for the

Brightness, Picture, Color, Tint, and Sharpness controls. A

Character Generator IC develops the RGB and Fast Blanking

signals for the On-Screen Graphics.

The PTV Signal/Deflection/High Voltage Module also features

an IF Signal Processor integrated circuit (IC200) and a NTSC

Signal Processor IC (IC600). The RGB signals from IC600 are

sent to the CRTs. A full-featured, one-chip, SteTeo Decoder IC

(IC120) is also included on the Signal/Deflection/Hiah VoltaGe

Module.

Signal Flow

The Signal/Deflection/High Voltage Module features split Audio

and Video IF processing. The TV signal is.applied to the U/V

Tuner, or through an optional RF Switch then to the UN Tuner.

The IF signal is developed in the UN Tuner and sent through a

dual output SAW Filter to the Audio and Video IF inputs of

IC200. The detected Baseband Audio signal exits IC200 and is

sent to the Stereo Decoder IC, IC120. Left and Right channel

audio signals exit the Stereo Decoder and are sent to the Jack

Panel for distribution. Some Models feature an Automatic

Volume Level control Module that is located on the frame of the

AVIO Jack Panel. This module acts like an AGC circuit for both

channels of audio.

The Video signal is developed by IC200 and is applied directly

to the Color MDPIP Module and also to the AVIO Jack Panel for

switching. The MDPIP Module is mounted on the Main Chassis

PCB next to the U/V Tuner. If an optional, chassis mounted,

Color MDPIP Module is used in the set, the composite video is

routed from the Jack Panel to the Color MDPIP Module to be

used as the PIP Picture. ReModulated Video (RMV) is sent

from the Color MDPIP Module to the S-VHS Switch IC, IC670.

External Video input from an External Video source can be

applied through the Jack Panel to the Color MDPIP Module.

Control of the Color MDPIP Module is via the 12C Bus.

The S-VHS Switch IC selects either the tuner signal or the

Super VHS signals from the Jack Panel. This composite video

is applied to the CCD Comb Filter, Closed-Caption Decoder

Module, and the NTSC Signal Processor. The combed

Chrominance signal is sent from the CCD Comb Filter Module

through the S-VHS Switch IC before being applied to IC600.

The combed Luminance is applied directly to IC600. The RGB

and Fast Blanking signals from the Character Generator, IC308,

are applied to the Closed-Caption Decoder before being applied

to IC600. These signals are matrixed when Closed-Caption or

On-Screen Graphics are needed and the product is output via

RGB lines to the Green CRT Board. Without RGB input from

IC308 or data from the Closed Caption Module, normal program

material is presented to the Green CRT Board. Both the Red

and Blue video information go through the Green CRT Board

before going to their respective boards.

The composite video signal from the Switch IC is also applied to

the NTSC Signal Processor to develop sync for the Vertical and

Horizontal Oscillators. The horizontal drive signal is applied to

the Horizontal Circuitry where the scan-derived voltages are

developed. The Horizontal Pulse (H Pulse) is sent to the High

Voltage Sync Processor, IC900, which drives the High Voltage

Output Circuit. This circuit develops the High Voltage, Screen

(G2) Voltage, and Focus Voltage. The vertical signal exits

IC600 and is applied to the Vertical Deflection IC, IC550. The

amplified vertical signal drives the vertical windings of the Yoke.

The Horizontal and Vertical signals are monitored by the

Shutdown Circuitry which will stop High Voltage development if

either signal is missing.

PTV Power Supply Module

The PTV Power Supply Block Diagram is shown in Figure 9.

The 120Vac Source is applied to a Bridge Rectifier circuit, which

produces approximately 155Vdc for the Switching Mode Power

Supply. There are two separate Switching Mode Power Supply

circuits used in the PTV. The 155V is supplied to both of these

circuits. Each circuit has its own transformer and Power MOS-

FET regulator. Both regulator circuits are controlled by one

Controller IC, IC401. One of the circuits is used for Standby

operation, with both circuits being used for Full Power operation.

As soon as the TV Set is plugged into an AC Receptacle, the

Standby Power Supply starts running from the voltage applied

through R415 to IC401-16. As the Standby Power Supply

comes up to full operation, approximately 12Vdc is provided via

Diode D405 to the Controller IC for the continuing Source

Voltage. A 15V-Standby Source is used as the source for the

5V Regulator, IC408.

The Standby Power Supply runs all the time the chassis is con-

nected to the AC Power Source. A square-wave signal exits

IC401-7 to drive the Standby Regulator, Q402. Q402 is a

Power MOSFET device that drives the Standby Transformer,

T402. The SMPS is switched to full-power by logic level control

from the Microcomputer. This logic level is input to the Control

IC, IC402-16. The Control IC operates the On/Off Opto-lsolator,

IC406. During Full Power On, the transister side of the Opto-

Isolator effectively opens and IC405 is allowed to control the

regulation of the Full Power Supply via IC401. A rectangular

wave signal is then allowed to exit IC401-10 to the Full Power

Regulator, Q401. Regulation is accomplished by monitoring the

130V Source via a voltage divider network. This feedback refer-

ence voltage is sent through the Control IC and the Output

Voltage Regulator Opto-lsolator to the Dual Controller IC. The

130V Source can be adjusted by changing the reference volt-

age via the 130V Adjust potentiometer.

Cable connections and voltage check points for the Power

Supply are shown in Figure 10. To assist in making connec-

tions, plugs and jacks have been color coded in the 1993

Projection Television. Note, Jack 402 has a yellow plug and

Jack 404 has a red plug. Another feature is that all boards have

been coded with a letter. The Signal/Deflection/High Voltage

board is the "A" Board and the Power Supply board is the "P"

Board (see Figure 18). The 404 cable end that connects to the

"A" Board is labeled "A404" and the other end of the cable that

connects to the "P" Board is labeled "P404". This labeling

method will help prevent incorrect connections.

All voltages from the Power Supply can be checked at the jacks

of either the "P" Board or the "A" Board. Also shown in Figure

10 are the Scan Derived voltages.

Shutdown Circuitry

The High Voltage circuitry, even though it is located on the main

chassis PCB, is separate from the Horizontal circuitry (Figure

11). The High Voltage is phase locked to the Horizontal signal

via the "Horiz Pulse" as input through Q900. This pulse is

applied to IC900-3, the High Voltage Sync Processor. Its output

drives the High Voltage stages to the HV Output Transformer,

T900. Here, the High Voltage and Focus/Screen Voltage is

developed. A Shutdown/Phase Sense winding from T900

develops the signal used for phase correction (input to IC900-8)

and Overvoltage Shutdown (input to IC902-1). Beam Current is

monitored from the bottom of the Diode Stack, Pin 10

(Aquadag).

The PTV will go into Shutdown when the High Voltage or Beam

Current increases beyond the designed safety limits. There are

four basic shutdown areas; too much High Voltage, too much

Beam Current, no Horizontal Scan, and no .Vertical Scan. In the

case of no Horizontal or Vertical scan, beam current must be

stopped quickly to prevent damage to the CRT's phosphor.

A sample of the High Voltage is taken from Pin 15 of T900 and

applied to the Programmable Shunt Regulator, IC901-1. This

sample can be adjusted by R943 to attain the desired High

Voltage. IC901 sends the product of this sample voltage

through Q903 to IC900-8 to regulate the output voltage. The

output of IC900 can be completely stopped if Q904 turns On

and inhibits the feedback path between IC901 and Q903. This

input via Q904 is the shutdown input for a scan type of failure.

There is also a sense input for the 15V Source called Low

Voltage Detection. Either one of these failures will blank the

Picture Tubes and turn On Q904, placing the set in shutdown.

The Shutdown Control IC, tC902, watches for too much High

Voltage and/or too much Beam Current. If IC902 is turned On

from either of these conditions, it must be reset by turning the

set Off and On again. Beam Current is monitored from the bot-

tom of the diode stack and applied to Q907/Q908. The output

from Q907/Q908 is applied to the Picture Control circuitry to

modify the contrast level and to IC900-8 to help control the reg-

ulation of High Voltage. When IC902 is turned On, Q901 is also

turned On, placing the set in shutdown.

The High Voltage shutdown comes from the Shutdown/Phase

Sense winding on the HV Output Transformer. If the level of

this pulse becomes too high, IC902 will turn On and shut the set

down.

SECTION 2

Troubleshooting the PTV System:

Access

To gain access to the various Modules and Panels in the PTV,

such as the Convergence Panel, CRT Boards, and Yokes - pro-

ceed as follows:

Gently pull off the two plastic railings on either side of the

Customer Keyboard. Next, remove the speaker grille. Now,

remove the screws holding the Convergence Panel and

place it into the service position.

Other Modules - remove the back cover.

The Signal/Deflection/High Voltage Module can be placed into a

troubleshooting position by removing one screw on each side of

the frame and two long screws from the top of the frame. Next,

release two tabs at the top and the module will hinge out. This

facilitates getting to the main board copper side without remov-

ing it from the set.

Diagnostic LEDs of the Power Supply

The Power Supply Module is equipped with two LEDs that are

visible when the cabinet back is removed. These LEDs are a

quick check for several possible problems or conditions. Under

normal operating (On) conditions both LEDs should be lit. If not,

these are the other possible conditions and what they indicate:

D429 (located on the front edge of the module):

On: Normal (lights up whenever AC is applied).

Blinking: Problem with 15Vdc Standby Supply.

D430 (located at the top of the module):

On: Normal (lights up at "Power-On" command).

Off: No 130Vdc Supply is present.

If there is a failure of the Power Supply Module, the voltages

shown in Figure 10 should be checked with a DVM. There are

three fuses located on the Power Supply Module that should be

checked. With the set connected to an AC Source, the 5V

Standby (P403-1) Source and 15V Standby (P403-2) Source

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