Hitachi 57S715 User manual

CONTENTS... 2004 DP-4X Chassis Projection Television Information
Materials Prepared by… Alvie Rodgers C.E.T. (Chamblee, GA.)
September 2006 (ver v)
2004 MODEL RELEASE
DIGITAL HD READY PTV
Model Chassis Remote P/N
57S715 DP-47 CLU-3842WL HL02062
51S715 DP-47 CLU-3842WL HL02062
65F710 DP-45 CLU-4341UG2 HL02071
57F710 DP-45 CLU-4341UG2 HL02071
51F710 DP-45 CLU-4341UG2 HL02071
51F510 *DP-43 CLU-4341UG2 HL02071
57F510 *DP-43 CLU-4341UG2 HL02071
Service Web Site
http://www.hitachiserviceusa.com
HITACHI
PROJECTION
TELEVISION
* Does Not Have a
Digital Module. No
ATSC Tuner.

DP-4X BLANK PAGE (NOTES)
BLANK PAGE

DP-4X TABLE OF CONTENTS
Table of Contents Page 1 of 2
September 2006(ver v) Materials prepared by
Alvie Rodgers C.E.T.
TOPICS PAGE
Continued on Next Page
SECTION (1) POWER SUPPLY DIAGRAMS:
•Generic Power Supply Circuits Explained ---------------------------------------------------------- 01-01
•Deflection Side Shutdown Circuit Diagram Explained ------------------------------------------- 01-04
•Deflection Side Shutdown Circuit Diagram Explained ------------------------------------------- 01-05
•PROT_OVP and PROT_OCP Shut Down Circuit Diagram Explanation -------------------- 01-06
•PROT_OVP and PROT_OCP Shut Down Circuit Diagram ----------------------------------- 01-07
•Deflection Power Supply Shutdown Output Circuit Diagram Explained -------------------- 01-08
•Deflection Power Supply Shutdown Output Circuit Diagram --------------------------------- 01-09
•Signal Power Supply Shutdown Circuit Diagram Explained ----------------------------------- 01-10
•Signal Power Supply Shutdown Circuit Diagram ------------------------------------------------ 01-12
•Stand By +5V Power Supply Generation Circuit Diagram and Explanation ----------------- 01-13
•Power Supply Relay Control Circuit Diagram Explained --------------------------------------- 01-14
•Power Supply Relay Control Circuit Diagram ---------------------------------------------------- 01-15
•SW +115V Hi Voltage Regulation Circuit Diagram Explained --------------------------------- 01-17
•SW +115V Hi Voltage Regulation Circuit Diagram ---------------------------------------------- 01-18
•IP01 Voltages and Waveforms ---------------------------------------------------------------------- 01-18A
•5.7V Volt Regulation Circuit Diagram Explained ------------------------------------------------- 01-19
•5.7V Volt Regulation Circuit Diagram -------------------------------------------------------------- 01-20
•LEDs (Visual Trouble Shooting) Deflection Power Supply Circuit Diagram Explained ----- 01-21
•LEDs (Visual Trouble Shooting) Deflection Power Supply Circuit Diagram ------------------ 01-22
SECTION (2) MICROPROCESSOR INFORMATION:
•Microprocessor DATA COMMUNICATION Explanation ------------------------------------- 02-01
•Microprocessor DATA COMMUNICATION Circuit Diagram ------------------------------------ 02-05
•Audio Video Mute Circuit Diagram Explanation -------------------------------------------------- 02-06
•Audio Video Mute Circuit Diagram------------------------------------------------------------------ 02-09
•Microprocessor NTSC Sync Input Circuit Diagram Explained --------------------------------- 02-10
•Microprocessor NTSC Sync Input Circuit Diagram Circuit Diagram ------------------------------ 02-11
SECTION (3) VIDEO CIRCUIT INFORMATION:
•Video Signal Selection Circuit Diagram Explained ----------------------------------------------- 03-01
•Video Signal Selection Circuit Diagram ------------------------------------------------------------ 03-03
•Composite Video Signal Path 1H NTSC Circuit Diagram Explanation ----------------------- 03-04
•Composite Video Signal Path 1H NTSC Circuit Diagram -------------------------------------- 03-06
•RGB Processor (Rainforest) Circuit Explanation ------------------------------------------------- 03-07
•RGB Processor (Rainforest) Circuit Explanation ------------------------------------------------- 03-09
•ABL Circuit Diagram Explanation-------------------------------------------------------------------- 03-10
•ABL Circuit Diagram ----------------------------------------------------------------------------------- 03-11
•H and V Sync to the Rainforest IC Circuit Diagram Explanation ----------------------------- 03-12
•H and V Sync to the Rainforest IC Circuit Diagram --------------------------------------------- 03-14

DP-4X TABLE OF CONTENTS
Table of Contents Page 2 of 2
September 2006(ver v) Materials prepared by
Alvie Rodgers C.E.T.
TOPICS PAGE
SECTION (4) AUDIO CIRCUIT INFORMATION:
•Audio Signal Selection Circuit Diagram Explanation --------------------------------------------- 04-01
•Audio Signal Selection Circuit Diagram Explanation --------------------------------------------- 04-03
SECTION (5) DEFLECTION CIRCUIT:
•Horizontal Drive Circuit Diagram Explanation ---------------------------------------------------- 05-01
•Horizontal Drive Circuit Diagram ------------------------------------------------------------------- 05-03
•IH01 Horizontal Drive IC Voltages and Waveforms (Also, Not Running Info.) ------------- 05-04
•Sweep Loss Detection Circuit Diagram Explanation ----------------------------------------------- 05-05
•Sweep Loss Detection Circuit Diagram--------------------------------------------------------------- 05-06
•Vertical Output Circuit Diagram Explanation ----------------------------------------------------- 05-07
•Vertical Output Circuit Diagram --------------------------------------------------------------------- 05-08
•Side Pincushion Circuit Diagram --------------------------------------------------------------------- 05-09
•Side Pincushion Circuit Diagram --------------------------------------------------------------------- 05-10
SECTION (6) DIGITAL CONVERGENCE CIRCUIT INFORMATION:
•Digital Convergence Interconnect Circuit Diagram Explanation ------------------------------- 06-01
•Digital Convergence Interconnect Circuit Diagram ---------------------------------------------- 06-06
•CLU-3842WL Remote Control ----------------------------------------------------------------------- 06-07
•CLU-4341UG2 Remote Control ---------------------------------------------------------------------- 06-08
•Adjustment Marker On/Off Explanation ----------------------------------------------------------- 06-09
•Adjustment Marker Movement by CH UP and CH DOWN Explanation --------------------- 06-10
•Convergence Adjustment Using and Outside Signal Explanation ------------------------------ 06-12
•Sensor Error Codes Explanation and Chart -------------------------------------------------------- 06-13
SECTION (7) CHASSIS PICTURES:
•Main Chassis Picture ---------------------------------------------------------------------------------- 07-01
•Signal PWB Picture ------------------------------------------------------------------------------------ 07-01
•Deflection PWB Picture ------------------------------------------------------------------------------- 07-02
•Convergence Output PWB Picture ----------------------------------------------------------------- 07-02
•Digital Convergence Unit (DCU) Picture --------------------------------------------------------- 07-03
•Sub (Signal) Power Supply PWB Picture --------------------------------------------------------- 07-03
•Tuner PWB Picture ------------------------------------------------------------------------------------ 07-04
•HDMI to DVI Adaptor Cable Comparison Picture --------------------------------------------- 07-04
•DP-43 Rear Panel (Rear Inputs) Picture ---------------------------------------------------------- 07-05
•DP-45 Rear Panel (Rear Inputs) Picture ---------------------------------------------------------- 07-06
•DP-47 Rear Panel (Rear Inputs) Picture ---------------------------------------------------------- 07-07
SECTION (8) SERVICE ADJUSTMENTS:
•See the index for this section after the Section 8 Divider. -------------------------------------- 08-00
SECTION (9) THINGS YOU SHOULD KNOW: Must be downloaded separately.
•See the index for this section after the Section 9 Divider. -------------------------------------- 09-00
SECTION (10) SERVICE POLICY:
Service Policy and PWB Part Numbers. --------------------------------------------------------------------- 10-01

DP-4X
CHASSIS INFORMATION
POWER SUPPLY
INFORMATION
SECTION 1

DP-4X BLANK PAGE “NOTES”
BLANK PAGE

DP-4X GENERIC POWER SUPPLY SHUTDOWN EXPLANATION
PAGE 01-01
GENERIC SHUTDOWN CIRCUITS EXPLAINED:
The following circuits are commonly used in Hitachi product and relate to the drawings for Shutdown:
SW +115V EXCESSIVE CURRENT DETECTION
(See Figure 1)
One very common circuit used in many Hitachi tele-
vision products is the B+ Excessive Current Sens-
ing circuit. In this circuit is a low ohm resistor RP34
in series with the SW +115V. The value of this resis-
tor is 0.39 ohm. When the current demand in-
creases, the voltage drop across the resistor in-
creases. If the voltage drop is sufficient to reduce the
voltage on the base of QP05, the transistor will con-
duct, producing a Shutdown signal that is directed to
the appropriate circuits indicated on the drawing for
Deflection Power Supply Shutdown Output Circuit,
OCP & OVP.
NEGATIVE VOLTAGE LOSS DETECTION
(See Figure 2)
The purpose of the Negative Voltage Loss detection circuit is to
compare the negative voltage with its counter part positive volt-
age. If at any time, the negative voltage drops or disappears, the
circuit will produce a Shutdown signal.
In Figure 2, there are two resistors. One to the positive voltage
+5V and one to the negative voltage –5V. At their tie point,
(neutral point), the voltage is effectually zero (0) volts, actually
about 1 Volt negative. If however, the negative voltage is lost,
the neutral point will go positive. This in turn will create a Shut-
down Signal through DK18 and on to the appropriate circuit in-
dicated on the drawing for Deflection Power Supply Shutdown
Output Circuit, OCP & OVP.
VOLTAGE TOO HIGH DETECTION
(See Figure 3)
Another circuit used is the Voltage Too High Detec-
tion circuit. In the example shown in Figure 3, the
zener diode DP39 is connected to a voltage divider
RP38 and RP39. If the voltage source rises too high,
the voltage at the divider center point will rise as well
and trigger or fire the zener diode which produces a
Shutdown signal through DP38 and on to the appro-
priate circuit indicated on the drawing for Deflection
Power Supply Shutdown Output Circuit, OCP & OVP.
Figure 1
SW +5V
Shutdown Signal
DK18
SW -5V
RK23
2.7K
RK22
1.8K
Negative
Voltage Loss
Detector
Figure 2
SW +115V
Voltage Too
High Detector
Shutdown
Signal
DP39
DP38
RP38
RP39
Figure 3
(Continued on page 6)
Current Sensor
Base
Bias
Shutdown Signal
RP34
0.39
QP05
SW+115V
CP46
RP36
RP35

DP-4X GENERIC POWER SUPPLY SHUTDOWN EXPLANATION
PAGE 01-02
GENERAL INFORMATION:
This explains the Overall Power Supply Shutdown Circuits:
Which turns off the Relay Driver for the Deflection Power Supply and the Relay for the Signal Power Supply.
DEFLECTION (High Voltage) POWER SUPPLY:
The Deflection Power supply is centered around the Switching Transformer TP01 and the driver IC, IP01.
This power supply creates voltages that are Switched on when the Set is turned on.
1. SW +115V 2. +220V
3. +28V 4. SW-28V
5. +7V 6. SW +6.3V
Other supplies are generated from these 6 main voltages.
SIGNAL (Low Voltage) POWER SUPPLY:
The Signal Power supply is centered around the Switching Transformer T201 and the driver IC, I201.
This power supply creates voltages that are Switched on when the Set is turned on.
1. 38.5V or 29V 2. +10.5V
3. +21V 4. SW-5.6V
5. +16V 6. SW +5.7V
Other supplies are generated from these 6 main voltages.
Q204 and Q203 Relay Inhibit Activation. (SHUTDOWN) called COMMON ACTION CIRCUIT.
All Shutdown events will cause the main power relays to turn off. This action will stop all secondary power supplies.
The Low Voltage power supply (Stand-By) will Shutdown along with the Deflection Power Supply.
See the DP-4X Signal Power Supply Shutdown Circuit for details.
If any of the shutdown circuits activate, the base of Q203 will go High. This turns on Q203 and removes the Power On Highs
from PPS1 connector pins 9(Power_Sig) and 11 (Power_Def) called Power_1 and Power_3. With this, the main power sup-
plies will STOP. Q204 operates as a “latch”. This prevents Q203 from turning off if the shutdown signal disappears after
shutdown.
SOME SHUTDOWN CIRCUITS ARE DEFEATED IN STANDBY MODE. (Set Off).
When the set is turned off (called Stand By), some of the shutdown inputs are not active because the voltages being monitored
are not on.
•Shorted FAN +10V (from from pin 3of IC303). This voltage is monitored by D313.
•Stopped Fans PPF2 and PPF3 pin 2. This is monitored by D313.
•Shorted Drv 16.5V (from pin 2of IC301) This voltage is monitored by D312.
•Prot_Drv (from pin 48 of PPS1) This voltage is monitored by D312.
•Prot_OCP (6 shutdown inputs) This voltage is monitored by D944.
1. SW +2.2V (IV01) * 2. SW +3.3V (IY01) * 3. SW +9V (IY07) *
4. VM +220V (QEA8) * 5. SW +6.3V (QP04) ** 6. SW +28V (DP30) **
* See the PROT_OVP and PROT_OCP Shutdown Diagram.
** See the Deflection Power Supply Shutdown Output Circuit Diagram. (Continued on page 3)
Any Positive
B+ Supply
B+
Q1
Shutdown Signal
Voltage
Loss
Detector
Figure 4
VOLTAGE LOSS or SHORT DETECTION
(See Figure 4)
One circuit used is the Voltage Loss Detection cir-
cuit. This is a very simple circuit that detects a loss of
a particular power supply and supplies a Pull-Down
path for the base of a PNP transistor.
This circuit consist of a diode connected by its cath-
ode to a positive B+ power supply. Under normal
conditions, the diode is reversed biases, which keeps
the base of Q1 pulled up, forcing it OFF. However, if
there is a short or excessive load on the B+ line that’s
being monitored, the diode in effect will have a LOW
on its cathode, turning it ON. This will allow a cur-
rent path for the base bias of Q1, which will turn it
ON and generates a Shutdown Signal.

DP-4X GENERIC POWER SUPPLY SHUTDOWN EXPLANATION
PAGE 01-03
(Continued from page 2)
See the DP-4X Signal Power Supply Shutdown Circuit for details.
These shutdown circuits are defeated because the SW (Switched) power supplies are turned off in standby. So to prevent
faults triggering of the shutdown circuit, the sensing circuits are turned off also..
Q206 generates the shutdown high signal if any of the shutdown circuits attached to its base become low. Q206 requires emit-
ter voltage to operated. RY05 supplies the 5.7V to the Emitter of Q206. This voltage must be active for Q206 to function.
When the set is turned off, RY05 opens and the 5.7V disappears so Q206 can no longer operate.
SHUTDOWN INPUTS EXPLAINED:
GENERAL INFORMATION CONTINUED: (See previous two pages for generic shutdown circuit details):
All of the Power Supply Shutdown circuitry can be broken down into the following categories;
•Voltage Missing Detection or Short Detection or Negative Voltage Loss Detection
•Voltage Too High Detection
•Excessive Current Detection
COLD GROUND SIDE SHUTDOWN SENSING CIRCUITS. (AC must be removed to recover).
All shutdown events arrive at the base of Q203. The shutdown events are categorized in the following pages.
The shutdown circuit are broken down into four pages. The shutdown outputs from each page are interconnected and indi-
cated by symbols shown below;
A
Please refer to the following Diagrams as you continue to read the following explanations.
1. The DP-4X Deflection Side Shutdown Diagram for (A), (B), (C), (D).
2. The DP-4X PROT_OVP and PROT_OCP Shutdown Diagram for (A), (B), (E), (F).
3. The DP-4X Deflection Power Supply Shutdown Output Circuit Diagram for (C), (D).
4. The DP-4X Signal Power Supply Shutdown Circuit for (E), (F).
B C D E F

DP-4X DEFLECTION SIDE SHUTDOWN DIAGRAM EXPLANATION
PAGE 01-04
See The DP-4X Deflection Side Shutdown Diagram for (A), (B), (C), (D).
HIGH VOLTAGE TOO HIGH DETECTION: One of the Shutdown circuits for output (A).
•DH15 High Voltage Too High Sensing Circuit.
This circuit monitors the High Voltage line generated by rectifying the pulse from the flyback TH01 pin
7. If the voltage created by rectifier DH13 and capacitor CH17 at the cathode of DH15 goes too high, this
zener will fire. This high will be routed to pin 8of PDS3 PROT_OVP (A) to the PROT_OVP and
PROT_OCP Shutdown Diagram.
•At the same time, the zener diode DH14 will fire and this high will be routed to pin 7of IH01. This is the
Horizontal Drive for High Voltage and this IC will shut off, turning off High Voltage drive pulses.
•The ABL is tied to the cathode of DH15 via RH32. This resistor offers slight “Trigger Point” deviations
as the screen brightness fluctuates and caused the High Voltage to bounce. By tying ABL to the Excessive
High Voltage detection voltage, the firing point is slightly altered.
VERTICAL OUTPUT CIRCUIT EXCESSIVE CURRENT DETECTION: One of the Shutdown circuits for
output (A).
•Q604 Vertical Circuit Excessive Current Sensing Circuit.
This circuit monitors the SW+28V line going to I601 Vertical Output IC. If the IC draws too much cur-
rent, R629 will develop a larger voltage drop. This will cause the base voltage of Q604 to fall turning on
this transistor. When this happens, its collector will go high. This high will be routed through D608 and to
pin 8of PDS3 PROT_OVP (A) to the PROT_OVP and PROT_OCP Shutdown Diagram.
-5V NEGATIVE VOLTAGE LOSS DETECTION: One of the Shutdown circuits for output (A).
•DK18 –5V Loss Detection Circuit.
The purpose of the Negative Voltage Loss detection circuit is to compare the negative voltage with its
counter part positive voltage. If at any time, the negative voltage drops or disappears, the circuit will pro-
duce a Shutdown signal.
There are two resistors. One to the positive voltage +5V RK23 and one to the negative voltage –5V
RK22. At their tie point, (neutral point), the voltage is approximately (-1V). If however, the negative
voltage is lost, the neutral point will go positive. This in turn will create a Shutdown Signal through
DK18. This high will be routed to pin 8of PDS3 PROT_OVP (A) to the PROT_OVP and PROT_OCP
Shutdown Diagram.
PROT_OVP INPUT INDICATED BY (C) One of several Shutdown outputs for item (A).
•The PROT_OVP signal (Active High) is shown in the center left hand side of the diagram. This is an in-
put from the Deflection Power Supply Shutdown Circuit Diagram. There are 3 circuits from the Deflec-
tion Power Supply Shutdown Circuit Diagram that provide inputs to this diagram.
•This is explained on Page 01-06.
SW +10.5V SHORT DETECT INDICATED BY (D) Shutdown output for item (B).
•D723 is attached to the B+ SW +10.5V line which is generated on the Signal PWB by QY62. If this volt-
age disappears or is shorted, D723 cathode will be pulled low generating a Low on Pin 9of PDS3 and
output as a shutdown signal on the PROTECT_OCP indicated as item (B).