Sony D99 CHASSIS Troubleshooting

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D99

OPERA TION MANUAL TROUBLESHOOTING MANUAL

CHASSIS

TABLE OF CONTENTS

CIRCUIT DESCRIPTION

D Board (Power Supply Section)............. 2

D Board (Deflection Section) ................... 9

A Board .................................................. 2 0

GENERAL TROUBLESHOOTING .............. 26

PA RTS LEVEL BOARD REP AIR................ 3 7

TRINITRON® COLOR COMPUTER DISPLAY

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CIRCUIT DESCRIPTION

D BOARD POWER SUPPLY SECTION Power Supply Electrical Circuit

The power supply is located on the D Board. It has three modes of operation that are controlled by a microprocessor. The topology is a discontinuous mode flyback converter with photocoupler feedback for regulating the secondary voltages. Circuit operation and troubleshooting are explained in the following sections:

Operation Modes Secondary Circuitry AC Input Protection Cir cuits Degauss Circuit T roubleshooting Primary Circuitry

Operation Modes

The power supply has four modes of operation, ‘off’, ‘active off’, ‘suspend/standby’ and ‘active on’. These modes are related to power savings and are indicated by the front panel LED. Additional indications are failure diagnostics and aging mode. The table below lists operation mode, condition and LED status.

Mode S ync s Conditio n LED

Off N/A Power Switch Off Off

Active Off No H and V Low Power, Heater Off Amber

Suspend/Standby No H or V Low Power, Heater On Amber 0. 5s<- ->Green 0.5s

Active On H and V Present Phase Locked, Normal Oper ation Gr een

Failure 1 NA HV or +B Fai lure Amber 0. 5s<- - > O ff 0. 5s Failure 2 NA H Stop, V Stop, Therm al Fail ur e Amber 1. 5s<- ->Off 0.5s Failure 3 NA ABL Failure Amber 0. 5s<- - > O ff 1.5s

Aging/Self Test No H and V Aging Raster or Test Pattern Green 0.5s<- ->Off 0.5s

Except for power switch off, all modes of operation are controlled by the microprocessor located on the D Board. The failure modes are detected by the microprocessor and the power supply is forced into active off mode. These functions are discussed later (Deflection).

With the AC cord attached to the monitor and connected to an AC source, the monitor will be off until the power switch is turned on. When the power switch is turned on, the power supply starts and is in active off mode. The next step is active on mode. The power saving modes are activated by the microprocessor based upon the presence of either H or V sync. If no sync signals are present, the power supply is set to active off mode. If only horizontal sync is present the power supply moves to suspend mode. If only vertical sync is present the power supply enters standby mode.

Power supply operation control signals are “Remote On/Off” and “Heater On/Off”. Remote On/Off is digital low for active off and suspend/standby modes. Heater On/Off is digital low for active off mode. To enter active on mode, the microprocessor must set remote on/off to digital high. Heater on/off is also made digital high and the heater is turned on.

Output Off Active Off Suspend/Standb

Active O n

B+ 0V 13V 180V 180V

80V 0V 10V 77V 79V

+15V 0V 1V 14V +15V

-15V 0V -1V -14V -15V

+12V 0V 0V 0V +12V

5V 0V 0V 0V +5V

Heater 0V 0V 4.6V 6.3V

H. Centerin

0V +7V +10V

STB Y 5V 0V +5V +5V +5V

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AC Input and Degauss

1. AC Input Section

The AC input section provides EMI filtering, input protection, surge limiting and CRT degauss operation.

EMI Filter

The EMI filter comprises CN600 (inlet with filter), X-capacitors C604 and C605, Y-capacitors C606, C638, C660 and C643 and the line filter transformer, LF602. Input protection is provided by F601and VA601; surge current limiting by thermistor TH600 and resistor R600. Degauss is explained in the next section.

Degauss Circuit

The degauss circuit is used to demagnetize the CRT. After power on, the microprocessor located on the D Board sets the degauss signal to digital high and Q601 turns on relay RY601. This allows AC current into the degaussing coil through posistor TH601. The current heats up the posistor and its affective resistance increases, this dampens the current in the degauss coil to nearly zero. Duration time is approximately 5-6 seconds and the microprocessor then shuts off RY601, which disconnects the degauss coil from the AC line. This operation should sufficiently demagnetize the CRT.

2. Primary Circuitry Section

IC601

The heart of the primary section is the TEA1504/N2 power supply controller, IC601. The following describes the functions of each pin.

Pin 1 – Vin: This is a MOSFET drain connection internal to IC601, which is connected directly to the DC mains v oltage rail. The startup current source derives power from the DC mains via the Vin pin. It supplies current to charge the Vaux (IC supply) capacitors C616 and C617 and also provides current to the IC601 control circuitry.

Pin 2 – HVS: High voltage safety spacer pin is a no connection.

Pin 3 – NC: Connected to primary side DC mains return.

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Pin 4 – Driver: Outputs the pulse width modulated gate drive for switching transistor Q602. Maximum duty cycle is set

internally at 80%.

Pin 5 – Isense: Provides cycle by cy cle over current protection by turning off pin 4 dr iv er output when Q602 current e xceeds the current limit corresponding to 500mV at pin 5. This pin typically provides 425nS of leading edge blanking time. The threshold voltage for switch over to low frequency (low power) operation is sensed by pin 5. When the voltage sensed at pin 5 is below 165mV, IC601 transitions from operating at high frequency (56.5KHz) to low frequency (23.5KHz).

Pin 6 – Vaux: IC601 supply pin. An internal current source from IC601 charges the Vaux capacitors C616 and C617 for startup. Once the Vaux capacitors are charged to the startup voltage level (11V), then IC601 starts switching pin 4 driver output. The Vaux is also supplied by an auxiliary winding from T601 on the primary side once the secondary output voltages attain their nominal operating voltage values. Pin 6 also provides under voltage lockout detection (8V) and over voltage protection (14.7V).

Pin 7 – DS: Provides the power supply for the driver output (pin 4).

Pin 8 – Iref: Controls IC601 internal bias currents, which determines the pulse width modulated switching frequencies.

High frequency is 56.5KHz during active on mode. Low frequency is 23.5KHz during suspend/standby mode.

Pin 9 – Vctrl: Feedback voltage for duty cycle control.

Pin 10 – NC: No connection.

Pin 11 – Gnd: Connected to primary side DC mains return.

Pin 12 – NC: No connection.

Pin 13 – Dem: Guarantees discontinuous conduction mode operation for the power supply. Verifies that T601 is demagne-

tized by not activating the next gate drive pulse until the primary side auxiliary winding of T601 is lower than the threshold level of 65mV as detected at pin 13.

Pin 14 – OOB: On/Off/Burst mode input signal. A voltage greater than 2.5V enables IC601.

Operation

The power supply is a discontinuous-mode flyback converter with photocoupler feedback for regulating the secondary voltages. The PWM controls the pulse width of the gate drive.

When AC is applied to the power supply and IC601 pin 14 is greater than 2.5V, start up current is supplied though IC601 pin 1 to IC601 pin 6. Startup voltage is approximately 11V. After start up, the voltage to pin 6 and pin 7 of IC601 is supplied through D620 connected to T601 pin 2. The first mode of operation is acti v e off mode. The output drive pulse frequenc y will be in burst mode operation.

When the power supply enters active on mode, the switching frequency will be 56.5KHz. The Vaux level will be approximately 12.5 volts. O VP threshold is 14.7 volts and UVLO is 8.0 v olts. T herefore, if the Vaux voltage is not correct, the powe r supply will not operate properly.

Feedback from the secondary side comes through IC603 and IC604, which is connected to IC601 pin 9. (See diagram on page 5.)

3. Secondary Circuitry Section

The secondary section consists of the following circuits. Rectifier diodes and filters for all output voltages, horizontal centering, +5/12 volt regulators, +5 standby regulator, heater voltage regulator, voltage feedback circuit, active off mode feedback, and protection circuits. This section will describe each circuit and its function.

Secondary Rectifiers

The secondary rectifiers supply the following voltages, 180V (B+) deflection and video, 80V video, ±15V deflection and regulators, 6.3 volt heater regulator, +5V standby regulator, horizontal centering voltages.

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Horizontal Centering

This circuit supplies IC503, which is used to adjust horizontal raster position on the CRT. The horizontal centering circuit consists of fusible resistors R638 and R639, diodes D615 and D616 and filter capacitors C630 and C631. In respect to the secondary ground, the horizontal centering ground is floating and connected to –H DY line. T he voltages in reference to this floating ground are ±10 volts. Care should be taken to not short the floating ground to the secondary ground.

+5/12 V olt Regulator

IC605 is the 12 volt regulator and IC608 is the 5 volt regulator. The output voltages are supplied to the microprocessor, deflection and video circuits. The +15 volt line provides the input voltage for +12V regulator; the +12V line provides the input voltage for +5V regulator. During active off or suspend/standby mode, the 12 v olt regulator is disabled via remote on/ off and subsequently the 5V regulator is disabled.

+5V Standby Circuit

IC607 is the standby 5V regulator. In the acti v e on mode and the suspend/standby mode, the input to the regulator is supplied from T601 winding 14-13. During the activ e off mode, the regula tor input is supplied from T601 winding 10-13 via D612 and D613. T ypical input v oltages to the re gulator are acti ve on mode: 9.5V; suspend/standby mode: 7.4V ; acti v e of f mode: 11.5V.

Heater V oltage Regulator

Heater filament voltage is supplied by T601 winding 14-13 and is regulated by IC602. IC602 output is turned on and off by the heater on/off control line at pin 1, CTL. The output is off during active off mode.

Feedback Circuit

The feed back circuit is divided into two sections. One is for active on and suspend/standby modes; the other for active off mode. The following two sections explains the theory and operation.

Acti ve On and Suspend/Standby Mode Feedback

Shunt regulator IC604 regulates the B+ line to 179.2V by sinking current through the opto coupler 1C603 to ground. The

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Feedback Circuits

reference voltage at IC604 pin 1 determines the sink current into pin 3. The reference voltage is set to 2.50 volts by resistor divider R608, R650, R648, and R609. Since the B+ is connected to the resistor divider, any change in B+ voltage is detected at the reference terminal. The shunt regulator will either increase or decrease the current into pin 3 in order to decrease or increase the B+ voltage respectively and try to maintain the reference voltage to 2.50 volts. IC603 biases it's phototransistor accordingly and drives IC601 pin 9 (Vctrl) which changes the duty cycle at IC601 pin 4 (driver) to regulate the B+ voltage at 179.2V.

Active Off Mode Feedback

Heater control line is low (heater off) during active off mode and respectively Q603 is off. Voltage pulses from T601 pin 10 flow through C620, R636, and R660 triggering the gate of thyristor D613. D613 turns on effectively shorting the B+ rail to the standby 5V regulator input; current flows from T601 pin 10 through D612 and D613 to the standby 5V regulator input. When the standby 5V regulator input is increased to approximately 12.7V it forward biases zener diode D605 turning on Q604 and sinks current through IC603 to ground. The standby 5V input supplies this current to IC603 pin 1. IC603 biases it's phototransistor and drives current through D609 into IC601 pin 14 (OOB) triggering burst mode operation. IC601 pin 4 (driver) is pulled low turning of f switching transistor Q602. T601 pin 2 (auxiliary winding) feedback pulses are discontinued and IC601 pin 6 (Vaux) decreases to 8V. IC601 internal current source then charges pin 6 (Vaux) to the startup voltage level (11V) which starts switching pin 4 driver output. The feedback cycle is then repeated. The burst repetition rate is approximately every 110mS and when IC601 pin 4 is switching its frequency is 23.5KHz.

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4. Protection Circuits

Protection Circuits

The following are protection circuits: OCP, OVP, UVLO and secondary short circuits. OCP is pulse by pulse and is performed on the primary side. OVP detects excessive output voltages. UVLO detects output under voltages. The following will explain the operation of these functions.

OCP

OCP is activated if there is too much current passing through the po wer MOSFET, Q602. This condition will occur if either the B+ line or 80 volt line is shorted.

R614 and R654 are the current sense resistors. Current through these resistors will produce a positive voltage reference to ground. R623, R624 and C650 provide a voltage divider and filter to IC601 pin 5 (Isense). If the voltage level exceeds 0.5 volts, the IC does pulse by pulse current limit and the output voltages are reduced. This condition can be audible and characterized by a ‘chirping’ sound.

OVP and UVLO

The OVP and UVLO functions are detected by IC601 pin 6 (Vaux). Vaux is mornally 12.5V. In the event the regulation control loop were to fail, the output voltages would either increase or decrease; then Vaux would increase or decrease respectively via T601 transformer coupling . IC601 pin 6 will detect an O VP at 14.7V and UVLO at 8V turning of f the driver output and initiating a low dissipation safe-restart mode.

Secondary Short Circuits

Safe operation during secondary short circuits is provided by the demag function of IC601 pin 13. Demag protection decreases the switching frequency to a very low level, thereby reducing the input power level and providing safe operation. Demag also provides a soft start function during startup gradually increasing the switching frequency until fixed frequency operation is attained.

5. Troubleshooting

Warning

Before attempting to fix the power supply, safety should be considered first. Never connect test probes to the primary side circuits, unless proper isolation has been installed. If isolation for the AC mains is not present, serious harm can occur. Never assume you are safe.

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No Power

In the event that the monitor does not turn on, first verify input power is applied to CN600 and the front panel power switch is turned on; then check F601 and R605. If these parts are blown, the primary side circuitry should be checked. If the fuses are not blown, then check the secondary side circuitry, especially the protection circuits. If these circuits are causing a no power symptom, the problem can be more readily found.

AC Input and Degauss Cir cuit T r ouble Shooting

For no power or nonoperating power supply, the AC input circuitry should be checked. Open or short circuit elements will cause non-operation. F601, CN600, and R605 on the D Board should be checked first. Check the front panel power switch for continuity.

If all elements are correct, check whether F601 breaks when power is applied and the power switch is closed. If the fuse does blow, there may be problems with the primary circuitry or a component short.

The degauss will malfunction if CN601 is not connected. One problem could be loss of degauss signal from the microprocessor. This can be verified by using the manual degauss command found in the OSD menu. If the signal does not appear at Q601 base, then it is possible that the microprocessor does not function correctly or standby 5V is not functioning.

The second step is to place a short across the AC terminals of RY601 for less than two seconds. If degauss operates then check Q601 and RY601. If degauss does not work, check TH601 for an open condition and VA600 for a short condition.

Primary Section

Three main areas can diagnose primary circuit failures. These are IC601, Q602 and Feedback system. Visible checks of these areas will aid in finding problems. The following will discuss each section.

IC601

First apply AC to the monitor and check IC601 pin 4 output. If the output on pin 4 is not present, there could be problems with Q602 and related parts or pin 14 could be less than 2.5 volts. Further, check Vaux level at pin 6. If it less than 11 volts, the IC could be in safe-restart mode. If the voltage is very low, there could be a short on any of the IC pins. In reference to ground, check the impedance of pin 1, 8 and 14. If any of these pins are shorted, replace the IC and check components connected to the related pins. Take care that C617 and C616 are fully discharged before replacing the IC.

Q602

The switching transistor can be damaged in various ways. These are related to voltage, current and temperature.

Check whether the transistor is shorted across drain and source terminals. If there is a short, F601, R605, R614, R654, R623, R624 and C650 should be checked. Additional components to check are D608, R612 and IC601. If Q602 is shorted, all these parts should be replaced.

Failure of a secondary rectifier diode can also cause Q602 to fail. Check 180V and 80V diodes for open or short conditions. There is also a clamp circuit, which is used to clip the turn off spike found on Q602 drain. If the clamp circuit is broken, it can cause Q602 failures. Check D606, C612 and R635. Also check the snubber circuit components C613, D607, R619 and R656.

Secondary Circuit

Failure in the secondary circuits can be categorized by rectifier diodes, fusible resistors, regulators, feedback loops and protection circuits. These sections are interrelated and failure in one can affect another. Consequently, some failures will also affect the primary circuitry.

Rectifier Section

Rectifier diode failures are not common, but do occur. Deflection, video and high voltage circuitry failures contribute to diode damage. In the event a voltage is not present, check for shorts to ground, open or short diodes. Also check fusible resistors found on the voltage lines.

Horizontal Centering

Loss of horizontal center adjustment can be affected by the rectifier diodes, fusible resistors, IC503 and related circuitry. Measure the voltages in reference to the horizontal centering ground. Typically, the voltages are ±10 volts. However, the adjustment setting can reduce the voltages. If there are no problems found with the diodes or fusible resistors, the next step is to check the adjustment signal at Q506. If the adjustment signal is not present check the IC901 pin 4. Otherwise, check IC503 and related components.

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+5/12 Volt Regulator

Loss of voltage due to shorts or device failures on either +12 or +5 volt output lines can occur. Consequently, IC605 or IC608 can be damaged and need replacing. Before replacing either IC, check for shorts or damaged parts along the output lines. If +12 volt does not appear, check the remote on/off signal from IC901 pin 6.

Standby 5V Circuit

Failure of this circuit can be affected by IC607. In case the circuit does not work properly, check D605, D614, R634, R611 and Q604. If these components are good, check the remaining circuit parts.

Heater V oltage Regulator

This circuit may be affected by fusible resistor R634 or D619. If these parts are good, check the regulator output for a short to ground. Shorts can occur on the video board. In the case of an output short, IC602 may have been damaged. If the IC appears to have no damage, check for any problems with the heater on/off signal.

Feedback Cir cuit

Problems with feed back can cause power supply shut down or low voltages. First determine whether the power supply is operating in active off, active on modes or not at all.

The power supply can be stuck in active off mode. The remote on/off signal, Q603, Q604, D605 and IC603 can affect this condition. Likewise, if the power supply is always in active on mode, the same items should be checked.

Checking for voltages at IC603 pins 1 and 2, IC604 pins 1 and 3 can solve more difficult problems. Additionally, IC603 pins 4 and 5, and IC601 pin 9 should be checked. If there are problems with these devices, 180V or standby 5V line, the feedback systems will not work correctly. Also check the protection circuits.

Protection Circuits

OCP occurs when there is excessive current through Q602. Failures with Q510, Q507 or the video section could cause this condition. These areas should be checked. OCP condition can also occur if R614 or R654 are open; if R623 is shorted; or if R624 is open.

OVP usually occurs when the feedback loop is open, or loss of standby 5V. Isolate the OVP trigger condition, by first checking the operation of the feedback loop.

D BOARD DEFLECTION SECTION

1. Horizontal Deflection Circuit

Overview

These circuit drive the DY (Deflection Yoke) for Horizontal Deflection. The H size and H shape control (IC501 and around) is included in this page as well.

H Drive, H Out, Feedback

+12Vp-p HD pulse is generated by the inverter Q903 using the Jungle IC902 H. out pin #17. And switch Q511 through A push-pull amplifier (Q501 and Q502) buffers. The drive current which introduced in HDT (T504) by this switching will drive Q507 (H out Tr) and 1000V pulse appears on collector. D506 is the "Damper Diode" which avoid the negative pulse and discharge the energy for next Horizontal Drive. Q508 is the buffer for the "H BLK" feed back to Jungle IC 902 H. FLY pin #14 and it will be the reference of phase / jitter control of Jungle. HST (T505) is to sense the deflection current through DY. The voltage appeared on secondary side will be the feed back for H Size/Shape control.

H Size/Shape control

HD pulse also triggering the H Size/Shape control IC501 pin #8. IC501 is "PWM IC" and it controls H and HV B+ chopper duty. H Shape and H size information is already included and coming from Jungle IC902 E/W pin #9. It will be supplied to IC501 pin #2. H reg output pin #20 is switching pulse of Q520 (B+ chopper). The energy supplement from 180V to H Def circuit (through L503 HOT) is controlled by the duty of this pulse. The H Shape input and feedback voltage from T505 are compared by error amp (in IC501) and H Reg out pulse duty is controlled to keep the level of these two the same.

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C543

H Deflection Circuit

C563

R551

R553

320

H DefINH Reg

Out

PWM IC501

E/W PIN #9

IC902

FB506

R581

180V

C575

12V

TO:

H Lin and

Ringing Circuit

H SHAPEINHD

R569

C582

R586

R582

R583

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C574

C576

T504 HDT

D518

D516

FB504

Q520

B+CHOP

L503

Q518

4 3

T504

HST

HDYHDY-

HOC

CN801

HD output pin #17

IC902

R933

Q903

12V

R594

R506

Q501

Q502

12V

C502

R508

D501

Q511

D502

R513 C510

2 1

H DY+ H DY+

H BLK

R517 R518

Q507

H-OUT

D506

C518

C521

C522

Q508

TO IC901 #32 pin

IC902 #14 pin

R511

-16V

Troubleshooting

See attached “FLOW CHART” and confirm if it’s really H Deflection issue.

No H Deflection / No Power

Check Q507, Q520 and D506 first. In case any of these shorted, check T504, Q511, R511 and D502. Those parts might have been damaged. If both of Q507, 520 were not broken, check the HD pulse at the gate of Q511. If no pulse, check Q501, Q502, Q903. Otherwise, check R582, D518 or try changing IC501.

Bad Distortion

Check pin#2 of IC501 and confirm that proper DC level and AC waveform. If the distortion is on only right side, check all above (“No H Deflection”). Otherwise, refer to the Troubleshooting of next section (“H Lin and Ringing Correction”).

2. H Linearity and Raster/Distortion Ringing Correction Circuit

This section includes HLC Control circuit, S cap switching and HLC/S-Cap Damping circuits. These circuits are placed directly on the “cool side” of DY which is in series with deflection current line. H Centering circuit will be explained in next section.

HLC Switch Control and HLC Damping

There is HLC switch circuit. In case that Q519 is on, RY500 turn on then, L509 is shorted. Q519 is controlled by Microprocessor (IC901). D505, R577 and C581 are damping circuit to avoid the raster Ringing (mainly on left side of picture) caused by HLC, DY and S-caps.

S-Cap switching and S-cap Damping

H Def current is distorted by resonance between S-Cap and DY to correct the linearity. Since the resonance frequency has to be changed for each fH, S-Cap switching is controlled b y MICRO S-Cap Switch - FETs (Q512, Q513, Q514, Q515, Q516) are "On" when its gate is Hi(5V) and that moment, drain voltage should be grounded (0V).

L506, R578 and C573 is damping circuit to avoid Distortion Ringing (mainly on top of the picture) caused by S-caps and H Control loop gain. L505, R575 and C572 is also the same purpose as above but only works when Q519 (Switch for the Biggest S-Cap) is “On”.

Troubleshooting

See attached “FLOW CHART” and confirm if it’s really H lin issue.

Bad Linearity

Confirm that Raster is approximately in the center of the Bezel. If not, refer to next section (Raster Centering Circuit). Check S-cap switches (Q512, 513, 514, 515, 516, HLC switch (Q519)) and confirm that H Linearity changes proportional to the value of “S-Cap”.

Bad Top Distortion/ Left side Raster Ringing

Check damping circuits explained above.

3. H. Raster Centering Circuit

Overview

H Centering is changed by supplying DC current to DY. D99 is taking the common level on DY cool(-) side and +/- 8V from power supply transformer(T601 PIN#16, 17, 18. #17 is the common).

H Center Circuit

The DC current is outputted by powered OP-amp (IC503). This circuit is making “invert amp” with the gain of R573/R579 and input 1S Q518 collector. The level is controlled by MICRO”H CENT" pin #4 through Q506(buffer).

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CN501

HDY - #5.6 pin

R593

L508 HLC

H SIZE/Shape Feedback

12V

R592

150

1/2W

:RN

4 5

1SS119

R577

D512

T505

C517

0.01 :PT

R590

22k :RN

R589

4.7k

2SA1309A

:DFT T503

Q521

L509 HLC

C583

0.1 :PT

C573

4.7

250V

RY500

R578

39 2W :RS

TH502

R591

150

1/2W

R516

:RN

150

1/2W

:RN

C581

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D505

ERB91-02TP1

C511

0.22

R512

4.7

250V

:PP

R515

:FPRD

C507

0.19

400V

C512

0.01

B:CHIP

L506

820µH

R521

:FPRD

Q514

2SK3332

R519

56k :RN

R576

47k

12V

1SS119

C514

0.82

250V

C530 250V

D519

:PP

0.12

C568

0.047 400V

:PP

C515

0.01

B:CHIP

Q519

DTC114TSA

C572

4.7

250V

R575

1/2W

:FPRD

L505

2.2mH

C516 250V

R525

:FPRD

R524

56k :RN

0.3

:PP

250V:PP

2SK2098

H CENTERING CIRCUIT

C523

0.12

250V

C531

0.068

Q513

C520

0.01

B:CHIP

Q512

2SK3332

R533

:FPRD

R523

56k :RN

Q515

2SK3332

C536

0.01

B:CHIP

C525

0.047 400V

:PP

R536

:FPRD

R535

56k :RN

Q516

2SK3332

C538

B:CHIP

0.01

C529

0.047 400V

STBY

:PP

R537

56k :RN

(BOARD)

H. LINEARITY AND RASTER/DISTORTION RINGING CORRECTION CIRCUIT

FROM D615 IN P.S.

C670

HC+

C580

R579

HC+

HC-

IC502

R538

L510

R539

C570

TO H. DY(-) VIA L503

(DRAIN OF Q520)

TO H. DY(-) VIA L510

Q518

R580

R570

D511

R571

C559

R573

R572

FROM PIN #17 T601

FROM D616 IN A.S.

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H CENT

C506

C631

R514

R529

Q506

HC N

HC-

T120

R500

C509

(BOARD)

(19D99 H. CENTERING CIRCUIT)

!!! IMPORTANT !!!

COMMON (ISOLATED)

CENTER VOLTAGE

#1, 2 PIN

Rotation Coil (CN701)

R563

R562

Rotation/Vertical Key Circuit

STBY

+15V

IC502

C549

V+

V-

R558

R559

R560

ROTATION

C547

IC901

R566

-15V

C513

Trouble Shooting

See attached “FLOW CHART” and confirm if it’s really H Center Circuit issue.

No Raster Centering Control

Check R638, 639 (Right next the SRT) first. If it’s open, change IC503. Confirm that voltage of Q5l8 base is changing accordingly to “HCENT _MINFH, HCENT_LO_FBFH, HCENT_HI_FBFH, HCENT_MAXFH” register. If not, change Q506.

CAUTION!!

The heatsink of IC503 is connected to the H center(-) level, not GND! It could have up to 150V and should not be touched to any other metals.

4. Rotation Circuit

Rotation is a PWM waveform at approximately 125kHz measuring 5Vp-p at pin #3 of the micorprocessor IC901. Then filtered by R560 and C547 combination. The DC current is outputted by powered 0P-amp (IC502). The output current from pin #4 of IC502 flows through R563 and the rotation coil and returns to ground through R566. The feedback is sensed at R566 and sent back to the amplifier through R562.

No Rotation Control

Check the waveform pin #3 of microprocessor IC901 if it is 5Vp-p PWM and approximately 125kHz. Otherwise, check around IC502.

5. Dynamic Focus Circuit

Overview

Both H and V Dynamic F ocus are combined through DFT (T503).

- 14 -

H DF

Horizontal Parabola is injected into the secondary side of the focus transformer (DFT:T503). In order to keep the amount of parabola constant over the horizontal frequency range the values of the AC coupling capacitors are changed by the transistors, which switch the s-caps. This signal is amplified by the turns-ratio to the primary side of the transformer.

V DF

V DF waveform is buffered by Q505 and amplified by Q504 to about 150vp-p. VDF is controlled by Jungle IC902 pin #12. 300v Vcc is made by FBT through D515. This voltage is also used for HV Protector.

Troubleshooting

See attached “FLOW CHART” and confirm if it is really a DF issue.

Bad H DF

Check H. Linearity. If it's no problem, change T701, T503 (DFT).

Bad V DF

Confirm that waveform is around 1Vp-p. If it’s more than 2.0Vp-p, change Jungle IC902. Check 300v from FBT from Jungle pin 12 IC902.

6. High Voltage Pr otect Circuit

This circuit generates the High Voltage supply for the anode and G2 (1000V) of the CRT. It consists of a high voltage driver and regulator similar to a switching power supply function. In addition, there are High Voltage and Beam Current protection circuits. All those circuits are similar to D1 chassis circuits.

High Voltage Regulation and Output Circuit

The HV Drive pulse is generated by IC501 and synchronized with Horizontal drive pulse. It is supplied to the Gate of Q510 the HV Out FET .

The HV Out Pulse approximately 700V, is generated by Q510 switching with the peak voltage being controlled by the switching duty of Q503 (B+ chopper). Internal resistors and R540 and RV501 divide HV generated in the FBT. Since this voltage is the feedback for HV Regulation control. Adjusting RV501 will result in changing the HV Regulation level(= HV level). HV Feedback voltage is returned to IC501 at pin#12 to be compared with an internal reference voltage of IC501 at pin#13. According to this feedback level, IC501 changes the pulse duty cycle. This pulse is felt at pin #18 of IC501 thereby controlling the output of B+ chopper drive Q503.

G2 V oltage

G2 voltage at approximately 1250vdc is produced by the HV Out Pulse rectifying through D510, C528, D520, D521, C578 and C577. This voltage will be supplied to A board via CN 510, which contains the G2 control circuit.

HV Protect Cir cuit

HV Protect circuit will be activated by the Microprocessor when the signal at HV DET, Microprocessor pins#18 reaches a +5vdc level. HV DET indicates the level of the primary current developed by the 300V winding of the FBT through R543, D515.

Beam Current Protect

Beam Current Protect will be activated when ABL DET at microprocessor pin#16 reaches a level of 0V when operating in main mode. ABL DET level is corresponding to the Beam Current which is supplied to FBT through R596, R550 and R548. The voltage current relationship is inversely proportional Voltage (down) Current (up).

T roubleshooting Hints

See attached FLOW CHART to confirm if is really an HV/Protect Circuit issue.

No HV / No Power

Perform basic checks of Q510 and Q503 first. If both Q510 and Q503 were not broken, check the HV Drive pulse at the gate of Q503. If no pulse, check R534 and D509. Otherwise, check R520, D504 or try changing IC501.

No G2 Voltage

Check R532 and D510, D520 and D521.

- 15 -

Dynamic Focus Circuit

FBT

R543

D515

FBT

C540

:DFT

TO FBT

PIN #15

T503

R519

56k

:RN

C568

0.047 400V

:PP

C530

0.12

250V

C515

0.01

B:CHIP

C516

0.3

250V

:PP

R525

:FPRD

R524

56k :RN

2SK2098

C531

0.068 250V

:PP

C520

0.01

B:CHIP

C523

0.12

250V

2SK3332Q513

Q512

R533

:FPRD

R523

56k :RN

C509 100p 500V

Q506

2SA1309A

Q515

2SK3332

C536

0.01

B:CHIP

C525

0.047 400V

:PP

R536

:FPRD

R535

56k :RN

Q516

2SK3332

C538

B:CHIP

0.01

C529

0.047 400V

STBY

:PP

R537

56k :RN

C511

0.22

R512

4.7

250V

:PP

C512

0.01

R521

:FPRD

Q514

2SK3332

R515

:FPRD

C507

0.19

400V

B:CHIP

VDF PIN #12

IC902

12V

R502 180k

:RN-CP

- 16 -

C501

R501

100

R503

CHIP

10k

:RN-CP

Q505

2SA1309A

R505

10k

C503

0.01

-15V B:CHIP

D529

MTZJ-T-77-18

Q504

2SC3941A-QR

R506 330k

:RN

R507

2.7k :RN

R565

330k

:RN

C504 330p 500V

C505 15pF

2kV

Protect Malfunction

To see if HV Prot or ABL Prot are suspect check the Shutdown Log data at the Shutdown Log register. Refer to Shutdown Log Table below. When an HV Shutdown is indicated, check R917, R921 and D905 or, replace T501 (FBT). Where ABL Shutdown is indicated, check the voltage T901 pin#11. If it is higher than 0.5v immediately prior to shutdown, check connections all the way to N board. Should the voltage reach and remain at the 0 volt level, even after the first 2.0 seconds of Power On, check D909 and 904 or check White Balance.

SHUTDOWN LOG TABLE Bit Register value Shutdown Mode Comment

bit7 128 N/A N/A bit6 64 N/A N/A bit5 32 Thermal Explained later bit4 16 ABL Shutdown Hardware Controlled bit3 8 HV Ove r Hardware Controlled bit2 4 HV U Shutdown Not Used bit1 2 No Vertical Scan Explained later bit0 1 No H Scan Explained later

7. Protection Circuitry Overview

Overview

The D99 chassis was developed with protection circuits other than HV/ABL.These protection circuits are controlled by Microprocessor (IC901);

- Thermal Shutdown: Activates when S-Cap Switch in FET are broken (especially Q513 and Q514).

- V Scan Shutdown: Activates when Ver tical Deflection signal is absent or of insufficient level or of a distorted nature.

- H Scan Shutdown: Activates when Horizontal Deflection signal is absent or of insufficient level or of a distorted nature.

T roubleshooting Hints

S Cap Switch Shutdown

In the event of failure of any S-Cap Switching FETs, the Microprocessor detects temperature of FETs (Q513 and Q514) by TH501 and goes into shutdown mode. For these conditions, refer to the section of H Linearity Circuit.

V ertical Scan Shutdown

If the V FLY feedback at pin #19 the Microprocessor doesn't get pulse around 1.5 second, a Shutdown will be initiated. Power Supply problems may also produce a similar type failure. For these conditions, refer to the V Deflection Circuit or the Power Supply section.

Horizontal Scan Shutdown

If the H BLK feedback at pin #32 of the Microprocessor doesn't get pulse around 500mSec, Shutdown will be initiated. Some power Supply problems may also produce a similar type failure. For these conditions, refer to the H Deflection Circuit or Power Supply sections.

8. Vertical Deflection Cir cuit

Theory of Operation

The negative input of amplifier IC401 is driven by VSAW signal generated by Jungle IC902 pin #8. The positive input of the amplifier is Vref Signal generated by IC701 (Convergence IC) pin #5. VSAW is centered on 5. 0V, and sawtooth waveform that controls VSIZE. Vref is a reference that is compared to VSAW at IC401. VCENTER is controlled by the shift of VSAW. IC401 serves as a transconductance amplifier (it amplifies a low level voltage into a high level current) for VSAW and the DC difference between VSAW and Vref. The current gnerated by IC401 is feed to the Vertical Deflection Coil. At the return point of the Vertical Deflection Coil the current flows through R403 and R405 which generates a voltage across them which is feed back to the amplifier via R404. V FLY is generated by flyback pulse generated at pin 3 of IC401. If the flyback generation at IC401 does not work, then the

- 17 -

HV REG DRIVE

PIN # 18 IC501

R534 C527

D509

R527

180V

B+ CHOPPER HV

D513

FB502

Q503

R561 R530 R531

C526

L501 L502

T501

:FBT

- 18 -

HV DRIVE PIN # 19

IC501

R520

R574

D520

CN510

G2 1ku

C577

D521

HV DET PIN # 18

D517

IC901

C544

R552

BOARD

19 D99 CHASSIS HV/PROTECTOR CIRCUIT

D504

C542

Q510

HV OUT

C578

C528

R595

D510

R549 R510

R547

300V

C519

R532

D515

C540

R543

FV1

FV2

ANODE OF CRT

R597 R541 R568

C534

R542

R540

RV501

C532

CRT VIA

RED FV LEAD

H DF OUT

SG501

H&VDF OUT

CRT VIA

BLK FV

LEAD

D514

C535

R545

R546

C539

R544

R548 R550

ABL DET PIN #1

C556

R596

C541

IC501 PIN #12

"HV FEEDBACK"

12V

R934

ABL DET PIN #16

IC901

C928

IC401

C403 D401

+15V

+16V

C404

Flyback Generator

V+ V-

TDA8177

LVDY

5417

R401 C402

- 19 -

V-DY through CN501

C409 R409

R410

5 Vref

IC 701

(CONV)

IC 902

R406

8 VSAW

(Jungle)

R404

-15V C401

C406

D-BOARD

R402

R405R403

Front Input

C Communication

V Sync and H fly

Heater and Focus Voltages

from D Board

Video

Process

D/A Conv

RGB Cathode Drv

D/A Level

Cuttoff

Voltage

J001

CRT

G2 V oltage

OSD Generation

G2,Cutoff

17 D99 Chassis A

Board Block Diagram

monitor goes to be shutdown as a V scan failure by microprocessor after wait around 1.5sec w/o VFLY.

Troubleshooting Hints

Vertical Scan Failure

The first step is to check the shutdown log of the monitor and make sure the microprocessor has detected a loss of VFLY. Once this has been verified the output of IC401 should be checked. If a normal output exists after the remote on/off bit is turned on but the monitor still shuts down then the VFB detection circuit is malfunctioning. If no output exists signal tracing should begin at IC902 pin #8 (VSAW) and IC701 pin 5 (Vref). In shutdown mode both of these levels should be

5.0V DC. If the remote on/off bit is turned on a sawtooth waveform of about 1Vpk-pk should appear on VSAWN while DCC2 stays at 5.0V this should last about 1.5 seconds until a loss of VFLY is detected and the monitor shuts down again. If the signals make it this far, the problem is likely in the IC401 area.

VIDEO "A" BOARD ELECTRICAL CIRCUIT

The Main function of the A Board is to receive incoming video signals and then process them into the RGB video drives necessary for proper CRT biasing. The input signals (RGB, Separate & Composite Syncs and DDC) are received with the conventional 15 D-sub connector. The RGB signals (0.7Vpp) are sent to the preamplifier (IC001) where they are amplified with Contrast gain and Brightness offset. Next they are sent to the Video Driver for final amplication to drive the cathodes. The Horizontal Sync pulse is buffered and then sent to the Microprocessor along with the Vertical Sync pulse. DDC is no longer handled on the A Board. It passes through the A board directly to the micorprocessor. IC003 is the On Screen Display (OSD) generator. OSD mixing is performed in IC001. Additional functionalities of the A Board include processing of all the CRT cathodes operating voltages; heater, G2 control, cathode DC bias, and focus.

- Sync Timing Buffering.

- RGB video signal amplification and adjustment according to white balance requirements, contrast and brightness settings.

- On Screen Display mixing.

- D/A conversion for RGB CRT cathode cutoff G2 levels control.

- 20 -

Video Input (0.7Vpp)

Video Select and RGB Process Functions

+12V

+5V

IC001

20 24 27

D/A Cutoff Control

3 4 5

D/A G2 Control

R G B

Board

From N

From IC003

R G B

C Data

C CLK

CBLK

BPCLP R_OSD B_OSD B_OSD

OSD_BLK

9 7

1 2 18

12 15 14 13 17

+12V

8 9

IC004

IC003

+80V

D104

C206

R G B

C106

CRT

D106

D206

D306

5 3 1

C306 D105

1. RGB Signal Processing (A Board)

RGB Signal Amplifiers

RGB video signals are amplified by IC001. Here the individual Sub Contrasts, Brightness offsets, and Contrast gain levels are set by the Microprocessor via I2 C control. The OSD RGB video signals from IC003 are mixed into the main video channels inside IC001. IC002 provides a final amplifier stage for the RGB video signals. This video driver is internally set to a gain of –14. Therefore at the output pins of IC002 (Pin1, 3 & 5) the waveform is inverted with typical drives levels on the order of 45Vpp. The Video Driver IC002 drives the CRT cathodes via AC coupling.

RGB Cathode Cutoff Amplifiers

The Red cathode DC cutoff level is amplified by IC004. It is controlled by the D/A output of IC001. The Red cutoff level is clamped by discharging C106 via D106. The Green and Blue cathode Cutoff levels are clamped in a similar fashion. The individual cathode cutoff levels are set for white balance by the Microprocessor via I2C communication with IC001.

T roubleshooting Hints

1) If the screen is blank with no output check:

- Video signals with proper cutoff levels are provided to the CRT cathodes.

- Supply voltages are at the appropriate levels and locations starting at CN305.

- Heater voltage is correct and present at the heater cathode.

- Diode shorts at the cathodes.

- Sync timing signals are present at the output of IC006.

- That there is I2C communication to IC001.

2) If the screen is lighted with no video check:

- Control, blanking and clamp signals to IC001, IC002.

- +5V, +12V, and +80V to these circuits.

-For shorted diodes on the IC002 outputs.

- 21 -

Block Diagram IC003 OSD

VFLB

VCO

HFLB

VDD(A)

VSS(A)

MCLK

VPOL

CHS

VERD

2 5

HPOL

BUS ARBITRATION

8 6

BACKGROUND

SDA(MOSI) SCL(SCK)

DATA

RECEIVER MBUS/SPI

RFG

LOGIC

NROW

VERTICAL CONTROL

CIRCUIT

MCLK

HORIZONTAL

CONTROL

and PLL

WADDR

GENERATOR

DHOR

SC CCLK

8 DATA

9 ADR

9 ADDRC

32 Y

HORD

WCOLOUR and CONTROL

X32B

DISPLAY MEMORY

CONTROL

REGISTERS

and DATA

MANAGEMENT

RDATA

ROW

BUFFER

CRADDR

CHARACTER ROMS

HIGH RESOLUTION FONT 12 X 18

CHAR

12 BITS SHIFT

REGISTERS

OSD_EN

LUMINANCE

COLOUR ENCODER

15 14 13 12 11

8 6

BLACKEDGE

INT

FBKG

HORD VERD CH

OSD_EN SHADOW BSEN

X32B

VPOL HPOL

WADDR WCOLOUR

and

CONTROL

CCOLOURS and SELECT

CHS

CWS

CWS BSEN

SHADOW

CCOLOURS and SELECT

Block Diagram IC004 Cut-off Module

12 V

Vref

GND

Video signal (R)

+B voltage

R-Cont in

R-bias out

G b

l o c k

Similar to R block

CRT cathode (R)

B b

c k

- 22 -

3) If colors are wrong or missing and white balance cannot be adjusted check:

- Each individual color signal path comparing DC offset and peak to peak signal levels to each other to determine if there is any single amplifier at fault.

- For shorted diodes on the IC002 outputs.

2. On Screen Display Functions

On Screen Display(OSD)

IC003 is the On Screen Display character and graphic generator. It provides RGB and Fast Blanking data to IC001 for mixing with the main video channels when required. Outputs voltages are two dimensional, either 0V or 5V. IC003 is controlled by the Microprocessor via the I2C bus. The sync timings necessary are V sync and H Fly.

T roubleshooting Hints

1) No OSD is displayed, check:

- RGB and Fast Blanking inputs to IC001. If there are no signals then IC003 may be at fault.

- That +5V is supplied to IC003

- V FLB and H FLB signals are at pins 10 and 5 of IC003 respectfully.

- That there is I2C communication to IC003.

3. G2

G2 Amplifier

The G2 reference is provided to IC005 Pin 5 by the IC001 D/A converter. The G2 voltage at the cathode is typically 500v ~ 750V.

T roubleshooting Hints

1) If picture is black, check:

- G2 level at the cathode using HV probe.

- Input to G2 amp, Pin 5 of IC005.

- Heater voltage at the cathode.

-+12V, +5V, and G2 voltage coming from D board.

4. Display Data Channel Circuit (DDC)

For DDC2BIC007 is a serial memory device providing Extended Display Identification or EDID data that is read by the compatible Host Computer on Pin 5. The basic EDID format consist of 128 bytes which are described in the table below. The 15 Pin VGA connector allocation is also described. The compatible Host Computer provides a V CLK on Pin 7 that is derived from the V Sync input and is used to set the timing of each data reading cycle. The data is clocked by the input of IC007 Pin 6. The rear input supports DDC2Bi. The data is passed through the A Board to the Microprocessor on the N Board via CN311.

T roubleshooting Hints

1. The DDCB circuit should be checked if error DDC messages or erroneous monitor identification data is indicated by DDC2B the compliant Host Computer. Check that the V CLK and S CLK signals are input to IC007 on Pins 7 and 6. The Data transition should be visible at Pin 5.

- 23 -

DDC Data format and VGA Connector Allocations

Basic EDID consist of 128 b

tes 15 pin VGA type connector

Number Description Pin No. Assignment Pin No. Assignment

8 Bytes Header 1 RED Video 11 Option 10 Bytes Vender/Product Identification 2 GREEN Video 12 Data(SDA) 2 Bytes EDID Version/Revision 3 BLUE Video 13 H SYNC 5 Bytes Basic Display Parameters/Features 4 Option 14 V SYNC 10 Bytes Color Characteristics 5 Return 15 Clock(SCL) 3 Bytes Established Timings 6 Red Return 16 Bytes Standard Timings 7 Green Return 72 Bytes Detailed Timing Description 8 Blue Return 1 Bytes Extenion Flag 9 Option +5V 1 Bytes Checksum 10 Sync Retu rn

IN VIDEO IN SYNC DISPLAY DATA COMMUNICATION BUS

MAIN

JIG

(DDC)

POWER SW

I/O(RS232C)

D BOARD

HEATER

POWER SUPPLY

System Block Diagram

VIDEO BLOCK

DC POWER

C-BUS

Deflection

PS Mode

SYNC PROC.&

CONTROL

N-BOARD

Sync

1Kv

OSD

A-BOARD

FOCUS BLOCK

FBT

I/O

RGB VIDEO

FOCUS/G2

ST ATIC/

DYNAMIC

FOCUS

DEFLECTI

I/O

H & V

D.CONV

DEF.

TIL T

H/V

USER CONT

BOARD

- 24 -

Alignment jig

(factory,service)

DIGITAL CONTROL COMMUNICATION DIAGRAM

HV sync

Micro

DDC

processor

IC1001

VIDEO BOARD

A BOARD

Pre-AMP

BIAS

DRIVE

CONTRAST

BRIGHT

IC001

Info r ma ti o n fo r USE R

OSD

IC003

(Host computer)

User conrol/

Power sw

I2C-BUS

N BOARD

DSP IC

IC002

EEPROM

SIZE(ZOOM)

CENT

G EOM(P IN ,KE Y.x )

CONV.(STAT,DYNAMIC)

FOCUS

- 25 -

GENERAL TROUBLESHOOTING

Input crosshatch from generator

No Picture

Missing Color or Abnormal Color

Visible Retrace or Visible Raster

Mis-convergence

Poor Focus

Unsynchronized Image

Abnormal Geometry

Abnormal Image Size

Shutdown

No Communication

Other Trouble

See Manager

- 26 -

NO PICTURE

Is amber

power LED

blinking?

amber LED

on?

green

power LED

on?

Yes

Check the video

cable connection

Press power switch;

if LED does not turn

on, repair power supply (I)

Does

A-Board make proper

contact with

CRT gun?

Yes

Check heater, G2, red, green

and blue cathode voltage levels.

Repair video (12) if needed

Done

- 27 -

Press A Board carefully

to make proper contact with

CRT gun

Can

you get

picture?

Yes

MISSING COLOR

Check signal

generator &

cable

(See Parts Level Board

Repair Section)

Check IC004, IC001 pins 7,

8, 9 and +B

voltage

Are

proper video

levels present

on CN313 pins

2, 4 & 6?

Yes

Are

proper AC

voltages present on

all cathodes?

Yes

Are

proper DC

voltages present

on all

cathodes?

Check IC005,

G2 control,

circuit, IC001

pin 6 and FBT

Yes

G2 voltage

correct?

Yes

Change the

CRT

Done

- 28 -

Check IC005,

G2 control

circuit, IC001

pin 6 and

FBT

VISIBLE RETRACE

Check white balance

adjustment

G2 voltage

correct?

Yes

Check

FBT

signal at

IC901 pin

Check IC001

and related

components

Check IC002

and

IC004

blanking pulse

present on pin 18

of IC001 on

A-Board?

Yes

blanking pedestal

present in the waveforms

at pins 20, 24 &

27 of IC001?

Yes

blanking pulse

present on all

cathodes?

- 29 -

Yes

Done

MISCONVERGENCE

Reset using

front panel control

Try adjusting convergence

using front panel controls

Yes

Try adjusting convergence

using DAS

Is the convergence

within spec?

Yes

readjust convergence

Is the convergence

now within spec?

Check the convergence circuit (IC701 & IC702

& IC703)

Change DY and

convergence

within spec now?

Yes

Is the convergence circuit

(IC701, IC702, IC703)

OK?

Done

Repair &

adjust

Change CRT &

readjust convergence

Done

- 30 -

POOR FOCUS

Adjust

focusVRs

Age monitor and check for focus change

Yes

Improved

focus?

Check focus leads

from FBT to CRT

socket

Check CRT socket

Is dynamic focus

circuit OK?

(See Parts Level Board

Repair Section)

Yes

Replace CRT

and verify

focus

Done

- 31 -

UNSYNCHRONIZED IMAGE

Check input signals CN313 pins 4, 8 and 9

Check video

cable

Check sync

separation circuits

on video board

Check wire

dressing and

connections

Are signals

correct?

Yes

Signals at CN309

pins 4, 5 and 7 OK?

Yes

Signals at CN903

pins 4, 5 and 7 OK?

Yes

Check circuits on

D-board (IC901

and IC902)

Done

- 32 -

ABNORMAL GEOMETRIC DISTORTION

Download

factory settings

Identify distortion

problem and repair

(See Board Level Repair

Section)

Is geometric

distortion

correct?

Yes

Done

- 33 -

ABNORMAL IMAGE SIZE

With user controls

adjust picture size

(See Parts Level Board

Repair Section)

4 or 5

(See Parts Level Board

Repair Section)

Yes

Horizontal size

adjustment OK?

Yes

Vertical size

adjustment OK?

Yes

Adjust monitor

Done

- 34 -

SHUT DOWN

Check power

supply

Check horizontal, vertical

deflection system and

check power supply

secondary voltages

Check high

voltage system

Yes

Is amber

LED blinking?

Yes

Check shutdown

Scan failure?

High voltage

failure?

(See Parts Level Board

Repair Section)

ABL OK?

Yes

Set factory settings

inside IC901

Done

- 35 -

NO COMMUNICATION

Correct

connection

Correct settings and connections

Check Connector and power supply

Are connections

to monitor OK?

Yes

Are computer

settings and

connections OK?

Yes

Is 5 volts present

at CN901 pin 2?

Yes

Check IC901 and

related components

Done

- 36 -

PARTS LEVEL BOARD REPAIR

Parts Level Board Repair

(1) Power Supply

(2) Horizontal Deflection

(3) High Voltage

(4) V ertical Deflection

(5) Horizontal Size

(6) Horizontal Center

(7) Key and Pin

(8) Key and Pin Balance

(9) Rotation

(10) ABL

(11) Dynamic Focus

(12) Video

(13) Convergence

- 37 -

POWER SUPPLY

Check F601

and D601

Check R627, Q503

Q510, Q520, Q507,

and video board

Check IC602, IC603, Q503, Q510, R614, R654, R623, R624, D605, Q604,

R627, Q520, Q507

Check for overload

on IC607

Replace Q602, Check F601, R654, R623, R624, C650,

R612, IC601, D608,

R605 and R614

Replace parts,

verify voltages

Yes

Does power

supply make

chirping noise?

Tries to start?

Q602 OK?

Yes

Are F601, D608, R605, R614,

R654, R623, R624, R612,

C650, IC601 OK?

Check A board; if

OK, replace D board

Yes

Check secondary diodes, FPRD resistors,

IC501, IC901, IC902, IC605, IC401, IC607, IC608

Operating

Yes

Verify voltages and

adjust monitor

Done

- 38 -

HORIZONTAL DEFLECTION

Check IC901 and

related components

Check IC902 and

related components

Check Q501,

Q502 & R504

Replace and check

related circuitry

Is IC901 pin 27

output OK?

(H-USYNC)

Yes

Is IC902 pin 17

output OK?

(H. Out)

Yes

Is Q501 emitter

output OK?

Yes

Is Q511 OK?

Replace and check

related circuitry

Replace and check

related circuitry

Yes

Is T504 and FPRDs OK?

Yes

Is Q507 OK?

Yes

- 39 -

HIGH VOLTAGE

Replace Q503,

D509 and check

related components

Check Q510,

Q503 and related

components

Check IC501

and

related components

Is Q503 OK?

Yes

Are Q510, Q503

and related

components OK?

Yes

Is IC501 pins 18

&19 output

OK?

Resolder if necessary

Yes

Is soldering or

mount around

RV501, C532 OK?

Yes

Change FBT, verify

operation and

adjust monitor

Done

- 40 -

VERTICAL DEFLECTION

Check power

supply

Check IC902

& IC701

Verify IC401

and verify

Are +15V and

(VSAW), IC701 pin 5

(VrefOut) & IC401 pin 3

Is IC401 OK?

-15V OK?

Yes

Are

IC902 pin 8

waveforms

OK?

Yes

Change DY

Adjust

monitor

Done

- 41 -

HORIZONTAL SIZE

Check if IC501,

Q503 & Q510

Check Q520 and

check related

components

Check IC902

Yes

Are horizontal and vertical size large?

Is Q520 OK?

Yes

Is IC902 pin 9

(E/W) output OK?

Yes

Repair H. Lin/ringing

correction circuit

Check IC501 and

related components

Is H Linearity OK?

Yes

Is IC501 pins 18 & 19

output normal?

(Q503 Drive)

Yes

Check T505 and

related components

Done

- 42 -

HORIZONTAL CENTER

Check IC901

Check D615, D616

Replace corresponding

parts & adjust

monitor

pin 4 (HCENT)

of IC901 working

OK?

Yes

Are

voltages at D615

and D616 OK?

Yes

Are

Q518 and Q506

and R529 OK?

Check IC503

OK?

Yes

Check related

components or FRU

Replace

IC503

Yes

- 43 -

Done

KEY AND PIN

Check IC902

Check IC501 and

related components

IC902 pin 9 (E/W)

outputs normal?

Yes

Are IC501 and

related components

OK?

Yes

Check Q520 and

related components

Done

- 44 -

KEY AND PIN BALANCE

Check IC901

Check if

IC902 pin 18

output OK?

Yes

Check related circuit

components; fix

and adjust monitor

Done

- 45 -

Check for shorts, check power supply and check IC502

ROTATION

+15V and -15V

Normal?

Yes

Replace IC502 and

adjust monitor

IC502 OK?

Yes

Check rotation coil

and connections

Done

- 46 -

ABL FAILURE

Is anode voltage correct?

(27 kV)

Check IC901,

FBT and related

components

Is IC901 pin

input voltage OK?

(ABL)

Check

if R546,

R545 and FBT

related circuit

OK?

Replace parts

& verify

Yes

Yes Yes

Check IC901

ABL register

settings

Readjust

and verify

Check high voltage circuits

Replace CRT and verify ABL

Is white balance adjustment OK?

Yes

Is CRT OK?

Yes

Replace D board

and verify

Done

- 47 -

DYNAMIC FOCUS

Check IC902

Replace and

adjust monitor

Replace and

adjust monitor

Is IC902 pin 12

output normal?

(V. Focus)

Yes

Are Q504, Q505 and

related components

OK?

Yes

Are T503 and related

components OK?

Yes

Check connection

to FBT and

to Video board

Done

- 48 -

VIDEO

Check connector

CN306,

IC901 & +5V

Check signal in

Check IC001

and HV

Replace parts

& verify

Check if

C bus pins

1 & 2 of IC001

OK?

Check if

CN313 pins 2, 4

& 6 OK?

Yes

Check if IC001 pins 20, 24 and 27 OK?

Yes

Check if IC002

pins 1, 3 & 5

OK?

Check IC004

and +B

Check IC005,

G2 control circuit

and FBT

Yes

Are cathode

DC levels correct?

Yes

Is G2 voltage correct?

Yes

Change CRT

Done

- 49 -

CONVERGENCE

"CONV-OFF" REGISTER

Change

to "0" and

adjust monitor

Check IC701, IC605 outputs

and +15V

power supply

Check IC702

and IC703

+15V & -15V

line power supply

Check "CONV_OFF"

Yes

Check if

IC701 outputs

pins 8, 9, 6 and 7

are OK?

Yes

Check

if IC702 outpins 1,

6, and IC703 output pins

2 and 8 are OK?

Yes

Replace connector

and related

components

Yes

Check

CN701 connector

if OK?

Yes

Replace

DY and verify

if OK?

Change CRT

Done

- 50 -

- 51 -

9-978-862-01

Sony Corporation

Sony T echnology Center

Product Quality Division

Service Promotion Department

- 52 -

English

99JJ74183-1

Printed in USA

Sony D99 CHASSIS Troubleshooting

Specifications and Main Features

Frequently Asked Questions

User Manual

D BOARD DEFLECTION SECTION

GENERAL TROUBLESHOOTING

PARTS LEVEL BOARD REPAIR