Toshiba ColorStream TP43H60 Handbuch

NTDMOD02

TOSHIBA

Service Training

PROJECTION

TELEVISIONS

Main Power Supply

& Complete

Shutdown Guide

TP43H60

TP43H95

TP50H15

TP50H50

TP50H60

TP50H64

TP50H95

TP55H60

TP55H64

TP55H95

TP61H60

TZ43V61

TZ50V51

TZ50V61

TZ55V61

TZ61V61

TOSHIBA AMERICA CONSUMER PRODUCTS, INC.

NATIONAL SERVICE DIVISION

1420-B TOSHIBA DRIVE, LEBANON, TN 37087

Contents

Main Power Supply...............3

Overall Block Diagram .................................................................................... 4

Operation........................................................................................................... 5

Surge Protection Relay ................................................................................... 6

Start-up and Over Voltage Protect................................................................. 7

Logic and Drivers............................................................................................. 8

Oscillator ........................................................................................................... 8

Oscillator Control............................................................................................. 9

Latch .................................................................................................................. 9

Thermal Shock Detection Block .................................................................... 9

Over Current Protection................................................................................. 10

Soft Start........................................................................................................... 10

Resonance Correction ................................................................................... 10

Additional Information on Q801 .................................................................... 11

Block Diagram of Q801 (STR-Z4117) ............................................................ 11

Pin Descriptions.............................................................................................. 11

Waveforms ....................................................................................................... 12

Troubleshooting Flowchart........................................................................... 13

Shutdown Guide.................15

Summary of Shutdown Circuits.................................................................... 16

Peak-Response Meter .................................................................................... 17

No Peak-Response Meter .............................................................................. 18

Monitoring Circuits ......................................................................................... 18

X-Ray Protect ................................................................................................... 19

+125V Over Current Protect .......................................................................... 20

+36V Over Current Protect ............................................................................ 21

+18V and – 18V Over Current Protect.......................................................... 22

+35V Over Current Protect ............................................................................ 23

+9V Under Voltage Protect............................................................................. 24

+35V Under Voltage Protect........................................................................... 24

+200V Under Voltage Protect ........................................................................ 24

Troubleshooting Flowchart........................................................................... 25

Main Power Supply

D882

D884

D891

D894

D886

D889

D851

D854

D856

D855

11 +36

+18

-18

+38

+12

+125

Q760 30V

Reg. To Q752

Conv. Output

To Q752 & Q751

Conv. Outputs

Q754 5V

Reg. To Digital Conv. PC,

Q764 & Q767

Q755 9V

Reg. To Q752

Conv. Output

To Q752 & Q751

Conv. Outputs

Q756 -9V

Reg. To Digital Conv. PC,

To Q601 Audio Out

Q430 9V

Reg. To Q501

Horizontal Start-up

To Shutdown & Surge protect:

Q846,SR82,Q757, & Q758

Q832 9V

Reg. +9-2 To Numerous Circuits

Q830 5V&9V

Reg. +5-2 To Numerous Circuits

+9-1 To Numerous Circuits

Q831 5V

Reg. +5-3 To PIP Module & QBB3

To Horizontal Output

D101 32V

Reg. To Tuner(s)

C870

T862

Main Switching IC

Q801

Z801

Error

Amp.

Q862

Photo

Coupler

D801

Rectifiers

Rectifier

165V

Feedback

SR81

Relay

Stand-by

Regulator

Rectifier &

Isolation Trans.

Q840

Microprocessor

QA01

QB30

Q843 Relay Drivers

D840

T840

Reg.= Regulator

Conv.= Convergence

+5-1

5V=Relay On

0V=Relay Off

AC Line

Input

From Shutdown

Stand-By Supply

Main Power Supply

VDD

Reset

Overall Block Diagram

Figure 1 is the overall block diagram of the main

switching power supply and the standby power

supply. The standby supply is always active when

the television is plugged into an AC line source.

This supply delivers a 5VVDD and a Reset 5V to

themicroprocessortokeepthemicroprocessorfunc-

tioningat all times, even when the television is not

operating. Transformer T840 isolates the standby

supply from the live ground, and D840 is a full-

wave bridge rectifier that supplies 12Vdc to volt-

age regulator Q840 and relay SR81 (connection

notshown). When the microprocessor receives an

ON command from the remote control or power

key, on the front of the television, it sends 5V to

relay drivers QB30 and Q843 to close relay SR81.

When the relay closes, theAC line input is applied

directlyto themain powersupply. Thesupplystarts

to operate and turns ON the television. D801 is

the full-wave bridge rectifier for the main power

supply. It rectifies the 120V AC line input to

165Vdc and applies it to the main switching IC,

Q801. The primary side of the power supply is

not isolated and, therefore, is at live ground. De-

tailed explanations of the main power supply are

covered in the remainder of this section.

TroubleshootingTip:

IfSR81 never closes,check the standbypowersup-

ply. Both the5V VDDand theReset 5Vare manda-

toryfor the microprocessor to operate.

Figure1.

PowerSupplyBlock Diagram

Load

Current

Resonant Freq.

Operating Freq.

Switching

Freq.

Increased

Load

Decreased

Load

Normal Operating Frequency is 70-80kHz

rent, the oscillator frequency decreases and oper-

atescloser tothe LCresonantfrequency. Thecloser

theswitchingfrequencyistoresonance,thehigher

the current flow through the primary windings of

T862andthelargertheelectromagneticfield. The

largertheelectromagneticfield iswhen itcollapses,

the higher the induced current is in the secondary

winding. When the load decreases and requires

lesscurrent, the switching frequency increases and

moves away from resonance. As a result, less cur-

rent is induced in the secondary windings.

Photo

Coupler

Error

Amp

T862

C870

Q801

Q862 Z801

125V

Operation

Themainpower supplyis acurrentresonantswitch-

ing power supply. Figure 2 is a basic block dia-

gramfor thissupply. TheprimarywindingofT862

and capacitor C870 create an LC series resonant

circuit. An oscillator (OSC), drive circuit, and two

MOSFETs are located internally to Q801 (STR-

Z4117). The OSC determines the power supply’s

switching frequency. The drive circuit alternately

switches the MOSFETs ON and OFF. The two

power MOSFETs, in a push-pull configuration,

alternate the current flow through the LC circuit

during normal operation. The alternating current

continuallybuilds andcollapses anelectromagnetic

field around T862’s primary windings. The col-

lapsing of the electromagnetic field induces cur-

rent into the secondary windings of T862. A full-

wave bridge rectifier converts the induced current

into 125Vdc.

To regulate the 125Vdc, an error amplifier moni-

tors the voltage and supplies a negative feedback

to the oscillator through photo-coupler Q862.

Q862 isolates the primary side of the power sup-

ply from the secondary side.

Refer to Figure 3. The power supply’s switching

frequency operates above the LC resonant fre-

quency. When the load on the secondary side of

the power supply increases and requires more cur-

Figure2

OperationalBlockDiagram

Figure3

LoadCurrentCharacteristics

Surge Protection Relay

Figure4 showsthe surgeprotectionoperation. To

prolong the life of the power supply, a surge cir-

cuit reduces current through the main power sup-

ply at startup. When the television is OFF, relays

SR81 and SR82 are open. At turn-on, SR81

closes and the switching power supply begins to

operate. Duringthis time,the power supplydraws

a large amount of current. To reduce the current,

the ground path for bridge rectifier D801 is

through resistor R810. Once the power supply

becomes fully operational and produces output

voltages, one of these voltages is applied to the

base of transistor Q846. This voltage turns Q846

ON and allows current to flow through the coil of

SR82. SR82’s switch closes and creates a direct

ground path for D801 by bypassing R810. SR82

remains closed during normal operation.

SR82

Q801

and

T862

D801

Q846

R846

12V

125V

Relay

SR81

R810

Main Power Supply

R809

Figure4

SurgeProtect

TroubleshootingTip:

R810 is a fusible resistor. If SR82 does not close

afterthepowersupplyisfullyoperational,R810even-

tuallyopensandprevents thepowersupplyfromop-

erating. Whenevertroubleshooting the power sup-

ply, check R810 first. If R810 is open, replace it,

usingToshiba part number 24007061, and look for

coldsolderjointsaroundQ846andR846.

Vcc

Start

OVP

R871

T862

C868

D864

R861

Q801

From

D801

16-20 Vdc 8

D876

Start-up and Over Voltage Protect

The positive cycle of the AC line input supplies a

16V start-up pulse to pin 8 of Q801 via resistor

R861. Figure 5 is the block diagram for this cir-

cuit. After start-up, a drive circuit consisting of a

secondary winding of T862, diode D864, and ca-

pacitor C868 supply 16-20Vdc to pin 8 of Q801 to

maintain its operation. The voltage developed by

the drive circuit fluctuates with the switching fre-

quency of the power supply. Therefore, the volt-

age on pin 8 is also applied to an over voltage pro-

tect (OVP) block internal to Q801. If the voltage

on pin 8 increases to 25V, the OVP triggers the

latch and switching stops. Refer to the Latch sec-

tion for further information. D876 is a 27V zener

diodethat protects Q801by preventing excessvolt-

age increases on pin 8.

Figure5

Start-upandOverCurrentProtect

Logic and Drivers

As shown in Figure 6, the logic block controls the

MOSFETs’ switching frequency. The outputs of

the logic block feed two drivers that are powered

by the start block. After the start-up voltage is

applied to pin 8, the start block supplies a drive

Vcc (DRI Vcc) of approximately 8V to pin 9.

Delaying the driver supplies at start-up prevents

damaging the MOSFETs. The 8V on pin 9 pow-

ers driver B internally. To power driverA, resistor

R862 and diode D862 add the voltage from pin 9

to the voltage on pin 15. D875, C863, D873 and

C873 are voltage regulators and filters for these

supplies.

Oscillator

Refer to Figure 7. Q801’s internal Oscillator de-

velops the power supply’s switching frequency by

generating a ramp waveform internally. During

normal operation, both MOSFETs are OFF for a

shorttimewhen theyare alternatelyswitching. This

OFF time is called dead time and determined by

the value of resistor R867 on the dead time (DT)

terminal pin 7.

Logic

COM.

Out

Vcc DRI Vcc

Start

R862 D862

C863

D875

C873

D873

T862

Q801

8915

B+

130V

Figure6

LogicCircuit

Figure7

Q801’sInternalOscillator

OSC

R867

Q801

Oscillator Control

If the load current drawn from the 125Vdc line in-

creases, the 125Vdc voltage begins to drop, de-

creasingthe currentthrough Q862’sLED side. The

current drop causes the LED to couple less light to

thephoto transistorside andreduce thecurrentflow

into pin 4 of Q801. This reduction in current flow

varies the OSC frequency,moving it closer to reso-

nance to increase the supply of current to maintain

the 125Vdc level. Conversely, if the load current

decreases,the 125Vdc rises and increases the light

through Q862 and the current into pin 4 of Q801.

The increased current causes the OSC operating

frequency to move away from resonance to de-

creasethe current supplied to the load and level the

125Vdc.

Figure8

OscillatorControl

Latch

The latch block stops the operation of Q801 until

the voltage on pin 1 of Q801 is removed by turn-

ing OFF the television. As outlined in Figure 9,

any one of the following detection blocks can trig-

ger the latch.

• Over voltage protection (OVP) Block (Refer

toStart-up section)

• Thermal shock detection (TSD) Block

• Over current protection (OCP) Block

The charging time of capacitor C869, connected

to the capacitor delay (CD) terminal pin 6, delays

the operation of the latch circuit during start-up.

Thermal Shock Detection Block

Thethermal shockdetection blocktriggers thelatch

if Q801’s internal temperature exceeds 150°C.

OSC

4Cont.

OSC

Control

Q862

R864

Z801

125 Vdc Load

Out

B+ Q862

C891

R884

R883 Q801

TSD OVP

LatchDelay

OC/RC

C869

Q801 1 V

Figure9Latch

Css

Q801

T862

C870

R870

C867

To pin 14,

Q801

C866

R866

R872

165V from D801

OSC

Control

C874

C872

11 RC

Over Current Protection

Figure 10 is the schematic diagram for the over

current protection and soft start circuits. The over

current detect (OC) senses excess current in the

LC series resonant circuit. As current in the LC

series resonant circuit increases, a voltage devel-

ops at the over current protect (OC) terminal pin

10. Resistor R870 and C874 detect the current

flowthroughthe LCcircuit. Resistor R866samples

thevoltage andappliesit topin10. Capacitor C867

is a filter to reduce ripple. Depending on the input

voltageon pin 10,theover current protect responds

in one of two ways:

(1) OC Low Threshold Voltage: +2V

When the input voltage at the OC terminal is

higher than +2V, the voltage at the soft start (Css)

terminal pin 5 lowers and the soft start engages.

Byreengaging the softstart, the mainoscillatorfre-

quencyincreases,reducing thecurrent flowthrough

the LC circuit. The soft start continues to operate

until the voltage on pin 10 drops below 2V.

(2) OC High Threshold Voltage: +2.5V

If the input voltage at the OC terminal exceeds

+2.5V,theoscillatorfrequencyincreases toits maxi-

mum frequency and C866 discharges rapidly.

When the Css terminal voltage decreases to 0.7V,

thecircuitresetsand C866charges again. Themain

oscillator frequency decreases gradually. If this

conditioncontinues, the latch engages and oscilla-

tionstops.

Soft Start

Still referring to Figure 10. At start-up, the soft

start is engaged by capacitor C866 on pin 5, soft

start(Css) terminal. Whilecapacitor C866 charges,

the switching frequency increases to reduce surge

currentthrough the MOSFETs. Once C866isfully

charged, the switching frequency goes to its nor-

mal operating frequency (approximately 70-80

kHz).

Figure10

OverCurrent Protect and Soft Start

Resonance Correction

Bymonitoring thecurrentflow throughpin11, The

resonance correction (RC) block prevents the

oscillator’s switching frequency from dropping

below the LC resonate frequency. As the switch-

ingfrequency decreases, current increases through

pin 11 of Q801. When the switching frequency

comes close to resonance, the RC block engages

the over current protect to increase the switching

frequency and move it away from resonance.

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