LG LCD Monitor Flatron M1721A M1921A – Circuit Diagram – Functions detail – EDID adjustment

1. Power Supply Block (LIPS)
This Block Generates DC Voltage (5V,15V) to Main Control system from AC Power (100-240V, 50/60Hz, 1.0A)
Also it has the inverter function converts input voltage to AC Rms value for the LCD lamp.
2. DC/DC Converter Block
DC/DC Converter convert the input 5V, 15V to proper 3.3V, 5V, 8V, 12V for Main control system.
For shooting heat trouble, we use the DC/DC converting IC
3. Audio Amplifier
This block is composed of TPA3005D2 and peripheral device.
The function of the audio amplifier is that to amplify audio L / R signal transmitted from audio decoder.  The audio signal is amplified according to pre-defined DC volume control curve.
4. Audio / Video / IF Decoder / Scaler
This block is composed of LOC1 and peripheral devices.
1) Video Decoder
This Block Selects input Video signals (like CVBS, Y/C) and output RGB signal.
On decoding, We can control signal like Contrast, Brightness, Sharpness, Color, Tint signals including Adaptive Comb Filter.
2) Audio Decoder
This Block analyzes audio input signal through A/V Jack and PC audio and Tuner IF.
The analyzed signals transmitted to audio amplifier.
On decoding, We can control signal like Bass, Treble.
3) IF Decoder
This block can change IF signal to audio and video signal that transmitted to Video/Audio decoder.
4) Scaler
This IC includes A/D Converter and LVDS Transmitter.
This IC is directly inputted Analog signal and transmits it to LCD Module.

5) Micom
This block controls each IC through IIC communication line.
5. Switch IC (PI3V512QE)
It is composed of PI3V512Q.
This IC selects between D-sub RGB signal and LOC1 RGB signal, and it transmits the selected signal to video signal processor.
6. Tuner (included Tuner Pack (TN200)
Micom controls this through IIC Line.
Tuner makes IF and transmits IF signal to LOC1.

Operation description LIPS

1. EMI components.
This part contains of EMI components to comply with global marketing EMI standards like FCC, VCCI, CISPR, the circuit included a line-filter, across line capacitor and of course the primary protection fuse.
2. Input rectifier and filter.
This part function is for transfer the input AC voltage to a DC voltage through a bridge rectifier and a bulk capacitor.
3. Energy Transfer.
This part function is for transfer the primary energy to secondary through a power transformer.
4. Output rectifier and filter.
This part function is to make a pulse with modulation control and to provide the driver signal to power switch, to adjust the duty cycle during different AC input and output loading condition to achieve the DC output stabilized, and also the over power protection is also monitor by this part.
5. Photo-Coupler isolation.
This part function is to feed back the DC output changing status through a photo transistor to primary controller to achieve the stabilized DC output voltage.
6. Signal collection.
This part function is to collect the any change from the DC output and feed back to the primary through photo transistor.

LIPS [SMPS] Circuit Diagram

EDID ADJUSTMENT

Operating System: MS Windows 98, 2000, XP
Port Setup: Windows 98 => Don’t need setup
Windows 2000, XP => Need to Port Setup.
This program is available to LCD Monitor only.

Port Setup
a) Copy “UserPort.sys” file to
“c:\WINNT\system32\drivers” folder
b) Run Userport.exe

c) Remove all default number
d) Add 300-3FF. 
e) Click Start button.

f) Click Exit button.

If you don't write EDID, check below
1. Enter "SVC Menu"
 Enter "Etc"
 Enter "Write Protect
1 : EDID protection (No write)
0 : EDID wirte
 Write EDID
2. Escape " SVC Menu" and push "In-stop" Button on SVC-Remote controller.

2. EDID Read & Write
1) Run WinEDID.exe

2) Edit Week of Manufacture, Year of Manufacture,
Serial Number
a) Input User Info Data
b) Click “Update” button
c) Click “ Write” button.

Schematic

Audio amplifier

Power

Scalar and Memory

Tuner LVDS

ADC ADJUSTMENT

1. DCXO setting in Video (AV2)

 Convert to AV2 in Input-source

 Signal equipment display

Output Voltage : 700 mVp-p

Impress Resolution : NTSC J (Model No.207 at MSPG925L)  Pattern : Color Bar (Pattern No.33 ant MSPG925L)

1) IN-START selection of Service Remote Controller

2) OPTION4 Selection

3) Right button selection in DCXO-AUTO(AV2).

Then, DCXO-AUTO may change from 0 to 1.

4) DCXO value confirmation  (Exit and Enter again Option4 _ Menu+Option4 selection)

2. Video (AV2) input ADC
 Signal equipment display
Output Voltage : 700 mVp-p
Impress Resolution : NTSC J (Model No.207 at MSPG925L)
Pattern : Gray pattern that left & right is black and center is white signal.
(Pattern No.29 ant MSPG925L)
1) IN-START selection of Service Remote Controller
2) AUTOADC Selection
3) Right button selection in Auto Gain.  Then, Value of Offset and Gain may change.

3. RGB-PC input ADC

 Signal equipment display

Output Voltage : 730 mVp-p

Impress Resolution : SXGA (Model No.45 at MSPG925L)

Pattern : Gray pattern that left & right is black and center is white signal (Pattern No.28 ant MSPG925L)

1) If Source change from AV2 to RGB-PC, Monitor executes auto intelligent.  Do not ADC In this condition.

2) Execute ADC after AC power off/on.

3) IN-START selection of Service Remote Controller

4) AUTOADC Selection

5) Right button selection in Auto Gain

Then, Value of Offset and Gain may change.

SERVICE OSD
Service Menu
Auto ADC
Reserved
Option 1
Option 2
Option 3
Reset All
200X. 0X. 0X
NTSC - XX
0X. 0X
LOC Ver X. XX. XX
Sedna Ver X. XX. XX. XX
Option 4
Description of operation
- Auto ADC : Adjust Auto ADC and Adjust RGB Gain/Offset
- Option 1 : Adjust Tuning
- Option 2 : Adjust Sound
- Option 3 : Adjust Country, Language
- Option 4 : Adjust etc..
- Reset All : Default setting.

Panasonic Plasma TV - How to enter service mode – adjustments – LED blinking timing chart - TX-P42S30B TX-P42S30Y

Service Mode – Mirror option – SOS history – Hotel mode – Data copy – and more - Panasonic Plasma TV

How to enter into Service Mode

While pressing [VOLUME ( - )] button of the main unit, press [0] button of the remote control three times within 2 seconds.
Note
Service Mode cannot be entered when 3D signal input.
Input 2D signal to enter Service Mode.

Key command
[1] button...Main items Selection in forward direction
[2] button...Main items Selection in reverse direction
[3] button...Sub items Selection in forward direction
[4] button...Sub items Selection in reverse direction
[RED] button...All Sub items Selection in reverse direction
[GREEN] button...All Sub items Selection in forward direction
[VOL] button...Value of sub items change in forward direction ( + ), in reverse direction ( - )

How to exit

Switch off the power with the [POWER] button on the main unit or the [POWER] button on the remote control.

Option - Mirror

Picture can be reversed left and right or up and down.

00 : Default (Normal picture is displayed)

01 : Picture is reversed left and right.

02 : Picture is reversed up and down.

[If the defective symptom (e.g. Vertical bar or Horizontal bar) is moved by selection of this mirror, the possible cause is in A-board.]

Service tool mode

1. Select [SRV-TOOL] in Service Mode.
2. Press [OK] button on the remote control.

Display of SOS History
SOS History (Number of LED blinking) indication.
From left side; Last SOS, before Last, three occurrence before, 2nd occurrence after shipment, 1st occurrence after shipment.
This indication will be cleared by [Self-check indication and forced to factory shipment setting].

Service mode display

POWER ON Time, On/Off

Note : To display TIME/COUNT menu, highlight position, then press MUTE for 3 sec.

Time : Cumulative power on time, indicated hour : minute by decimal

On/Off : Number of On/Off switching by decimal

Note : This indication will not be cleared by either of the self-checks or any other command.

Exit

1. Disconnect the AC cord from wall outlet or switch off the power with [ Power ] button on the main unit.

Hotel mode

Access command to the Hotel mode setup menu

In order to display the Hotel mode setup menu:

While pressing [VOLUME (-)] button of the main unit, press [AV] button of the remote control three times within 2 seconds.

Then, the Hotel mode setup menu is displayed.

To exit the Hotel mode setup menu

Disconnect AC power cord from wall outlet.

Data Copy by SD Card

Board replacement (Copy the data when exchanging A-board):
When exchanging A-board, the data in original A-board can be copied to SD card and then copy to new A-board.

Hotel (Copy the data when installing a number of units in hotel or any facility):
When installing a number of units in hotel or any facility, the data in master TV can be copied to SD card and then copy to other TVs.

Preparation
Make pwd file as startup file for (a) or (b) in a empty SD card.
1. Insert a empty SD card to your PC.
2. Right-click a blank area in a SD card window, point to New, and then click text document. A new file is created by default (New Text Document.txt).
3. Right-click the new text document that you just created and select rename, and then change the name and extension of the file to the following file name for (a) or (b) and press ENTER.

File name
(a) For Board replacement : boardreplace.pwd
(b) For Hotel : hotel.pwd
Note
Please make only one file to prevent the operation error.  No any other file should not be in SD card.

Data copy from TV set to SD Card

1. Turn on the TV set.

2. Insert SD card with a startup file (pwd file) to SD slot.  On-screen Display will be appeared according to the startup file automatically.

3. Input a following password for (a) or (b) by using remote control.

(a) For Board replacement : 2770

(b) For Hotel : 4850

Data will be copied from TV set to SD card.

It takes around 2 to 6 minutes maximum for copying.

4. After the completion of copying to SD card, remove SD card from TV set.

5. Turn off the TV set.

Following new folder will be created in SD card for data from TV set.

(a) For Board replacement : user_setup

(b) For Hotel : hotel

Data copy from SD Card to TV set
1. Turn on the TV set.
2. Insert SD card with Data to SD slot.  On-screen Display will be appeared according to the Data folder automatically.
3. Input a following password for (a) or (b) by using remote control.
(a) For Board replacement : 2771
(b) For Hotel : 4851
Data will be copied from SD card to TV set.
4. After the completion of copying to SD card, remove SD card from TV set.
(a) For Board replacement : Data will be deleted after copying (Limited one copy).
(b) For Hotel : Data will not be deleted and can be used for other TVs.
5. Turn off the TV set.
Note
1. Depending on the failure of boards, function of Data copy for board replacement does not work.
2. This function can be effective among the same model numbers.

Self-check indication only

Produce TV reception screen, and while pressing [VOLUME ( - )] button on the main unit, press [OK] button on the remote control for more than 3 seconds.

Self-check indication and forced to factory shipment setting
Produce TV reception screen, and while pressing [VOLUME ( - )] button on the main unit, press [MENU] button on the remote control for more than 3 seconds.

Exit
Disconnect the AC cord from wall outlet or switch off the power with [ Power ] button on the main unit.

Power LED Blinking timing chart

When an abnormality has occurred the unit, the protection circuit operates and reset to the stand by mode. At this time, the defective block can be identified by the number of blinks of the Power LED on the front panel of the unit.

Line faults and rlated PWBs

Local screen failure
Plasma display may have local area failure on the screen.  Is the possible defect P.C.B. for each local area.

Sony LCD TV48W605 - How to enter service mode – adjustments – Self check mode W585 – W605 – W608 models.

Applicable to: W580B/W585B/W590B/W600B/W605B/W607B/W608B/WM15B

KDL-40W580B KDL-48W580B KDL-60W600B
KDL-40W590B KDL-48W585B KDL-60W605B
KDL-40W600B KDL-48W590B KDL-60W607B
KDL-40W605B KDL-48W600B KDL-60W608B
KDL-40W607B KDL-48W605B KDL-60W610B
KDL-40W608B KDL-48W607B KDL-60W630B
KDL-48W608B KDL-60WM15B
KDL-48WM15B

ASIA CHINA AMERICA JAPAN & EUROPE

SERVICE ADJUSTMENTS

Accessing Service Mode

1) Go to TV standby condition by remote commander.

2) Press “i+ (info)”, “5”, “Volume +” then “TV power” on remote.

3) You can see Service Mode on display.

* The above operation should be finished within 15 seconds after the set go to STBY mode.

Transition of Each Micro’s Service Mode
OPTIONS
1. First of all, when you enter Service Mode, you can see “Digital” service mode.
2. Whenever you press “OPTIONS” on remote, service mode is changed according to the flow below:

Digital” > “Chassis” > “VPC”

Part A “Chassis” & “VPC”

Part B “Digital” service mode.

Change Data by Service Mode 1 (Part A)

Change Data of “Chassis” or “VPC” service mode

a. Press “2 / 5” on remote to select (up / down) category.

b. Press “1 / 4” on remote to select (up / down) Item.

c. Press “3 / 6” on remote to change (up / down) data.

Save Changing Data by Service Mode 1

2. Write data for “Chassis” or “VPC” service mode.

a. Press “Mute” on remote.  It shows green “SERVICE” changes to green “WRITE”.

b. Press “0” on remote. Green “WRITE” changes to red “WRITE”. It indicates writing is processing.

c. After a while, red “WRITE” changes to green “SERVICE”. Writing process is done at this point.

3. TV reboot is necessary for applying data change.

Change Data by Service Mode 2 (Part B)

Change Data of “Digital” service mode (except “003 DIG_SRV_MODE” category)
a. Press “2 / 5” on remote to select (up / down) category.
b. Press “1 / 4” on remote to select (up / down) Item.
c. Press “3 / 6” on remote to change (up / down) data.

[“Digital” service mode don’t have to Save. (except “002 MODEL”)]

2. Change Data of “Digital” service mode ( “003 DIG_SRV_MODE” category). “003 DIG_SRV_MODE” is one category of “Digital” service mode. Please note because this operation is special.
a. Press “2 / 5” on remote to select “003 DIG_SRV_MODE”.
b. Press “1 / 4” on remote to select (up / down) Item.
c. Press “0 / 10” on remote to select item.
d. Press number key “1”~”9” directly. “*” stamp move.
e. Press “12 / enter / select” to decide and advance to the next step. Press “return”, to return to the previous page.

Checking Board Information

In “Digital” service mode ( “002 MODEL” category)
2. Press “0 / 10” on remote to select item.

3. Press “1” on Remote

Note : Check the Result. Result 1 : NG ,
Result 2: OK, Result 3 : OK (With “TUNER BOARD OPTION is changed correctly”) comment.

This case is NG. The main board is mismatch to the tuner board.
The value of Tuner Board Option was kept.

4. Press “Return” on Remote
5. Press “2” on Remote.

This case is NG.
The main board is mismatch to the tuner board.
The value of Tuner Board Option was kept.

This case is OK.
The value of Tuner Board Option was kept.
In this case, The value of Tuner Board Option is never changed automatically.

6. Press “Return” on Remote.

 [IF “OK” Go to Save Changing Data by Service Mode 2.]

Save Changing Data by Service Mode 2 [Only when B* board is replaced.]

In “Digital” service mode ( “002 MODEL” category)
001 SEG Select segment information
002 DEST Select destination information
003 MODELNAME Select Model Name
004 SERIAL Can be set Only Once for the new board
005 SHIP_CONFIRM...Can set correct Product Code
006 VAR_TYPE Select variable information.

Change data for each model.
b. Press “Mute”, “0” on remote sequentially. Red “WRITE” is shown. This indicates writing is in process.
c. After a while, red “WRITE” disappears. Green Done will be displayed for a while, which means writing process is done.
d. For the items SEG, DEST, MODELNAME after changing each item, service save (“mute”+”0”) is required. For the item SERIAL, after inputting the serial number, press key “12” or “Enter” to save the data.

Please save the items according to the sequence “SEG -> DEST -> MODELNAME-> VAR_TYPE”
– When Saving the item "SEG", sometimes instead of "Writing", the word "Pending" will appear. In this case, skip "SEG", saving "DEST“ , "MODELNAME“ and “VAR_TYPE” is OK.

Restore WB / Gamma Adj. Data to B board.

[apply after USB-DL when B board is replaced.  HE,HS Models]

1.in “VPC” service mode
a.Select “000 DATA_COPY” category by pressing “2 / 5” on remote.
b.Change data from “0” to “1” by pressing “3 / 6” on remote.
c.Wait until data is changed from 1 to 3.
d.When data is changed from 1 to 3, restoring process is finished.
e.In case data is changed from 1 to 2, keep default setting. (No more process is needed.)

WB [White Balance] Adjustment by Service Mode
1. in “VPC” service mode (“004 WB” category)
a. Press “1” or “4” on remote to select WB adjustment menu.
b. Change data by pressing “3” or “6”. Each range of these items is 0~1023.
c. Press “mute” ＋”0” on remote to save the data. “SERVICE” comment is changed to “WRITE”, indicating writing process.
d. After a while, “WRITE” comment returns to “SERVICE”, which means writing process is done. (takes about a couple of seconds)

VCOM Adjustment (NFR-AUO/SDC/FXC Panel)

STEP1

DIGITAL (DIG_SRV_MODE) SERVICE

TEST PATTERN

> 1 Video

*1 White

2 Ramp

3 R Raster

4 G Raster

5 B Raster

6 Color Bar

7 VCOM Pattern1

8 VCOM Pattern2

9 Off

1. in “Digital” service mode

a. Select “003 DIG_SRV_MODE”  category by pressing “2 / 5” on remote.

b. Press “0” to go to “TEST PATTERN” Mode.

c. Press “Enter” or “12” to go into Video TEST PATTERN.

d. Press “7” or “8” to select the test pattern

e. Press “Enter” or “12” twice to show the VCOM TEST PATTERN.

STEP2

VPC SERVICE

002 VCOM

000 ENABLE 0

2.in “VPC” service mode

a. Select “002 VCOM” category by pressing “2 / 5” on remote.

b. Select “000 ENABLE” item by pressing “1 / 4” on remote.

c. Change ENABLE from “0” to “1” by pressing “3” to enable VCOM adjustment.

STEP3

VPC SERVICE

002 VCOM

001 ADJUST 64

3. in “VPC” service mode

a. Select “002 VCOM” category by pressing “2 / 5” on remote.

b. Select “001 ADJUST” item by pressing “1 / 4” on remote.

c. Change data by pressing “3 / 6” on remote.

STEP4

4. in “Digital” service mode

a. Select “007 VCOM” category by pressing “2 / 5” on remote.

b. Change data from “1” to “0” by pressing “3 or 6 ” on remote.

c. Confirm the final result of the VCOM adjustment .

d. If OK, Finish the VCOM adjustment. If NG, pressing “3 or

6” to show the OSD again and go back to VCOM adjustment Step 3.

VCOM Adjustment (HFR-AUO/FXC Panel)

VPC SERVICE

002 VCOM

000 ENABLE 0

1. in “VPC” service mode

Select “002 VCOM” category by pressing “2 / 5” on remote.

b. Select “000 ENABLE” item by pressing “1 / 4” on remote..

c. Change ENABLE from “0” to “1” by pressing “3” to enable VCOM adjustment.

-The Picture is change Vcom Pattern and you can’t see OSD

STEP2

in “VPC” service mode (There is no OSD.)

Select “002 VCOM” category by pressing “2 / 5” on remote.
b. Select “001 ADJUST” item by pressing “1 / 4” on remote.
c. Change data by pressing “3 / 6” on remote.
d. Finish the adjustment when the picture seems OK.
e. Select “000 ENABLE” item by pressing “1 / 4” on remote.
f. Change ENABLE from “1” to “0” by pressing “6” to disable VCOM adjustment. And you can see OSD.

REC Setting - STEP1

in “Digital” service mode
a.Select “003 DIG_SRV_MODE” category by pressing “2 / 5” on remote.
b. Select “006 REC_SETTING ” item by pressing “1 / 4” on remote.
c. Press “0” or “10” to go to detailed REC setting screen.

STEP2

in detailed REC setting screen
a. Press “1” to select “Key Copy” item
b. Press “Enter” or “12” twice to execute the command.
c. If OK, show the message “Key Copy OK”. If NG, show the message “Key Copy NG (= xx )”.
d. Press “Return” to return to previous page.

STEP3

in detailed REC setting screen
a. Press “2” to select “HDD Re-Register” Item.
b. Press “Enter” or “12” twice to execute the command.
c. If OK, xx= x+1. If NG, xx=x.
d. Press “Return” to return to previous page.

Reset Panel Operation Time [Only when Panel is replaced.]

In Self Diagnosis Display
a. Reset Panel Operation Time <7> -> <0>

Set to Shipping Condition

How to do shipping condition.

a. Move to “Digital” service mode.

b. Press “8” on remote. It shows green “SERVICE” changes to green “RST-”.

c. Press “mute” on remote. Added green “EXE” after green “RST-” .

d. Press “0” on remote. Green “EXE-RST” changes to red “EXERST”. It indicate writing is processing.

e. After a while, red “EXE-RST” changes to green “SERVICE”.

f. And blink Smart Core WHITE LED. Writing process is done at this point.

Another way
You can set to shipping condition w/o entering Service Mode.
> “Cursor Up” + “Power Key” on remote.

How to Enter Self Diagnosis Display

Go to TV standby condition by remote commander.
2. Press “i+ (info)”, “5”, “Volume-” then “TV power” on remote.
3. You can see Self Diagnosis Display.
4. To Exit , Press Power Off and On.

Self Diagnosis Display [Part i)

Format of error time stamps

YYMMDDhhmmss (in UTC)

Example:

120823132523 -> Aug 23 2012 13:25:23 UTC

* Only when time is set, an error timestamp is saved.

*Following error is invalid in RB1.

- FAN_ERR

- EMIT_ERR

- TCON_ERR

Error history clear  <8> -> <0>

Panel operation time clear  <7> -> <0>

•Panel Operation Time is recorded every 30 min, but Total Operation Time is recorded every 1 hr. Therefore, the panel op. time might become larger than the total op. time.

Self Diagnosis Display (Part ii)
USB dongle:
1. When no Wi-Fi USB dongle is connected, NA is displayed.
2. If you insert/disconnect Wi-Fi USB Dongle during Self Diagnosis Display, press <1> - > <4> on remote commander to refresh MAC address displayed on “USB dongle”.
- Alternatively, you can re-display Self Diagnosis Display to update the information.

Hitachi DIGITAL RECEIVER KHWS1W - KHWS1WUN - How to disassemble – Circuit Diagram

Used ICs: TA7358AP – TA8132AF – TC9327F-200 – BA4501F – BU4066BC – TA7368P – TA8126F – DRD3515A – PCF8574AT – MM1385P – MM1385H – HD6432128F A20 – 24LC194 – MAS3506D

FM/MW/SW1/SW2 4-bands Superheterodyne
FM: 87.5 - 108 MHz
MW: 522 - 1620 kHz (9 kHz steps)  520 - 1620 kHz (10 kHz steps)
SW1:2.300-7.300 MHz
Meter band: 120, 90, 75, 60,49, 41 m
SW2:9.500-26.100 MHz
Meter band: 31, 25, 21, 19, 16,13, 11 m
FM/SW1/SW2: Telescopic antenna (aerial)
MW: Built-in ferrite-core antenna (aerial)

Disassemble Procedure

Removal of Back Case 

(1) Remove 3 screws 1 from the back and 2 screws 2 inside the battery compartment.

(2) Detach the Antenna.

(3) Detach the connector A.

Removal of SATELLITE P.W.B. Board)

(1) Detach all connectors B, C and D.

(2) Remove 1 screw 3 from the Satellite P.W.B. Board.

(3) Remove 2 screws 4 from the Satellite P.W.B. Board.

(4) Release the 3 catches and slide the Satellite P.W.B. Board away.

Removal of TUNER P.W.B. Board
(1) Detach 5 connectors E, F, G, H and I from the Tuner P.W.B. Board.
(2) Turn to the opposite side, remove 1 screw 5 from the Tuner P.W.B. Board.
(3) Detach 9 catches and separate the Tuner P.W.B. Board from the sub-chassis.

Removal of Insulator Pad (Fig. 4)
(1) Remove 6 screws 5 from the Insulator pad.

Removal of Main Board.

(1) Remove 4 screws 6 from the Main Board.

Removal of Speaker.

(1) Release one end of the metal pin that secures the speaker position.

(2) Slide out the speaker.

Removal of POWER SUPPLY P.W.B. Board.

(1) Remove 4 screws 7 and detach 1 connector J from the Power Supply P.W.B. board.

Removal of ANTENNA P.W.B. Board

(1) Remove 1 screw 9 from the Antenna P.W.B. board.

(2) Gently pull the Antenna P.W.B. board outwards.

Removal of WS ANTENNA SUPPORT PLATE.

(1) Remove the 6 screws 8 and pull the WS Antenna Support Plate away from the Back case.

Wiring Diagram

Circuit diagram (Schematic)

Click on the pictures to magnify

marantz 1072 – marantz 1050 – Stereo amplifier Schematic

Stereophonic Amplifier - marantz 1072 / marantz 1050 Circuit Diagram - Click on the pictures to zoom in

Circuit Diagram

JVC KD A55 - Gradient CD6500 - Tape deck - Circuit Diagram - Wiring diagram

Schematic and Wiring Diagram - JVC KD A55 - Gradient CD6500

Schematic [Circuit Diagram]  Click on the pictures to magnify

Mechanism control

PWB & Wiring diagram

Samsung CRT TV CS14 CS21 – Service Mode – Adjustments - Circuit Diagram

Samsung CS14F10MJ0XBWT CS20F10MJ0XBWT CS21F10MJ0XBWT CZ21A083NXXEG COLOR TELEVISION RECEIVER – How to enter and adjust data values in Service Mode – Default data values – Service mode adjustments – Schematic

Factory Mode [Service Mode]
1. Do not attempt these adjustments in the Video Mode.
2. The Factory Mode adjustments are necessary when either the EEPROM (IC902) or the CRT is replaced.
3. Do not tamper with the “Adjustment” screen of the Factory Mode menu. This screen is intended only for factory use. 
When EEPROM (IC902) Is Replaced
1. When IC902 is replaced all adjustment data revert to initial values. It is necessary to re-program this data.
2. After IC902 is replaced, warm up the TV for 10 seconds.

When CRT Is Replaced

1. Make the following adjustments AFTER setting up after setting up purity and convergence :
White Balance
Sub-Brightness
Vertical Center
Vertical Size
Horizontal Size
Fail Safe (This adjustment must be the last step).
2. If the EEPROM or CRT is replaced, set PVA to 40 (factory mode) and set SC as follows.
14 inch : 0
20 inch : 9
21 inch : 9

Procedure for the “Adjustment” Mode

1. This mode uses the standard remote control.  The Service Mode is activated by entering the following remote-control sequence :

(1) DISPLAY=>FACTORY.

(2) STAND-BY=> DISPLAY=> MENU => MUTE => POWER ON.

2. The “SERVICE (FACTORY)” message will be displayed. The Service Mode has four components: ADJUST, OPTION and Reset.

3. Access the Adjustment Mode by pressing the

“VOLUME” keys ( Up or Down). The adjustment parameters are listed in the accompanying table, and selected by pressing the CHANNEL keys (▲/ ▼)

4. Selection sequences for the all system:

DOWN or UP key:

SCT>SBT>BLR>BLB>RG>GG>BG>VSL> VS>VA>HS>SC>SDL>STT>SSP>PDL> NDL>PSR>NSR>AGC>VOL>LCO>TXP

5. The VOLUME keys increase or decrease the adjustment values (stored in the non-volatile memory) when Adjustment Mode is cancelled.

6. Cancel the Adjustment Mode by re-pressing the “FACTORY” or “Power OFF” keys.

Default data values and options

Click on the pictures to zoom in

Circuit Diagram (Schematic)

White Balance Adjustment

Warm up the TV for at least 30 minutes in the Aging Mode (OSD White). This mode is displayed by entering the following sequence:

DISPLAY => FACTORY => FACTORY

2. Input a Toshiba pattern.

(b) Low-Light Adjustment

1. Set SBT to 3.5 ± 0.5 fL in the Factory Service Mode with using CA100.

2. Adjust RG,BG so that the levels are suitable to each local area.

(c) High-Light Adjustment

1. Set SCT to 55 FL (20”. 21”), 65 FL(14”) in the Factory Service Mode with using CA100.

Center Convergence Adjustment

1. Warm up the receiver for at least 20 minutes.

2. Adjust the two tabs of the 4 pole magnets to change the angle between them. Superimpose the red and blue vertical lines in the center area of the screen.

3. Adjust the Brightness and Contrast controls for a well defined picture.

4. Adjust the two-tab pairs of the 4 pole magnets, and change the angle between them.  Superimpose the red and the blue vertical lines in the center area of the screen.

5. Turn the both tabs at the same time, keeping the angle constant, and superimpose the red and blue horizontal line in the center of the screen.

6. Adjust the two-tab pairs of the 6-pole magnets to superimpose the red and blue line onto the green. (Changing the angle affects the vertical lines, and rotating both magnets affects the horizontal lines.)

7. Repeat adjustments 2~6, if necessary.

8. Since the 4-pole magnets and 6-pole magnets interact, the dot movement is complex

Sony KV DR29M93 Trinitron Color TV – Service mode – Power and Deflection Circuit Diagram – LED Blinking codes

Sony KV-DR29M93 - RM-991 Hong Kong – Flat Trinitron Color TV – LED blinking codes – Reset – SMPS and Deflection circuit diagram

Color system PAL, PAL 60, SECAM, NTSC3.58, NTSC4.43
Television system B/G, I, D/K, M

SELF DIAGNOSTIC FUNCTION

The units have a self-diagnostic function. If an error occurs, the STANDBY/TIMER lamp will automatically begin to flash.
The number of times the lamp flashes translates to a probable source of the problem. A definition of the STANDBY/TIMER lamp flash indicators is listed in the instruction manual for the user’s knowledge and reference. If an error symptom cannot be reproduced, the remote commander can be used to review the failure occurrence data stored in memory to reveal past problems and how often these problems occur.

DIAGNOSTIC TEST INDICATORS
When an error occurs, the STANDBY/TIMER lamp will flash a number of times to indicate the possible cause of the problem. If there is more than one error, the lamp will identify the first of the problem areas.
Result for all of the following diagnostic items are displayed on screen. No error has occurred if the screen displays a “0”.

STANDBY/TIMER LIGHT FLASH COUNT

+B overcurrent 2 times
+B overvoltage 3 times
V deflection stop 4 times
White balance failure 5 times
Horizontal Deflection Failure 6 times.

[One flash count is not used for self-diagnostic.]

STOPPING THE STANDBY/TIMER FLASH
Turn off the power switch on the TV main unit or unplug the power cord from the outlet to stop the STANDBY/TIMER lamp from flashing.

SELF-DIAGNOSTIC SCREEN DISPLAY
For errors with symptoms such as “power sometimes shuts off” or “screen sometimes goes off” that cannot be confirmed, it is possible to bring up past occurrences of failure for confirmation on the screen:
[To Bring Up Screen Test]
In standby mode, press buttons on the remote commander sequentially in rapid succession as shown below:

Screen display => channel [5] => Sound volume [-] => Power ON.  [Note that this differs from entering the service mode (mode volume [+])]

Since the diagnostic results displayed on the screen are not automatically cleared, always check the self-diagnostic screen during repairs. When you have completed the repairs, clear the result display to “0”.

Unless the result display is cleared to “0”, the self-diagnostic function will not be able to detect subsequent faults after completion of the repairs.

Clearing the result display

To clear the result display to “0”, press buttons on the remote commander sequentially as shown below when the diagnostic screen is being displayed.

Channel [8] > 0

Quitting Self-diagnostic screen

To quit the entire self-diagnostic screen, turn off the power switch on the remote commander or the main unit.

SELF-DIAGNOSTIC

+B overcurrent [OCP] => Occurs when an overcurrent on the +B(135) line is detected by Q6610 and Q6609.  If Q6610 and Q6609 go to ON, the voltage to the pin3 of IC001 go to UP.  The unit will automatically turn off.

+B overvoltage [OVP] => Occurs when an overvoltage on the +B(135) line is detected by D6635 and Q6611. If Q6611 go to ON, the voltage to pin6 of IC001 go to UP. The unit will automatically turn off.

Vertical deflection failure => Occurs when an absence of the vertical deflection pulse is detected by Q6819 and R6832. Shut down the power supply.

White balance failure => If the RGB levels do not balance or become low level within 5 seconds.  This error will be detected by IC4301.  TV will stay on, but there will be no picture.

High voltage protector of Horizontal Deflection => Occurs when an overvoltage of horizontal pulse is detected by D6809 and IC6801.  If the voltage of anode D6830, Q6800 and D6825 goes to High, the voltage to pin34 of IC4301 go to UP. The unit will automatically turn off.

SMPS and Deflection - Circuit Diagram

Deflection control

Velocity Modulation

Click on the schematics to magnify

"RESET" FUNCTION

There are 2 ways to access to the "RESET" Function
a) By pressing "RESET" button on the Remote Commander.
b) By pressing "MENU" button on the Front Key Input and hold it down for 5 seconds.

Sequential to the resetting operation (either methods being used in No. 2), TV set would shut down once and automatically turn on again. The power-off duration is expected to be about 500msec. An OSD message, "RESET" tentatively will be displayed for 10 sec after IK status gets stable.  As a result, some items will be reset to an initial condition (shipment condition) whereas some other remains at the last selection by user.

[An electrolytic capacitor installed with the wrong polarity might explode.]

Attack 6400 – PROFESSIONAL Power Amplifier – Circuit Diagram – Working voltage + 103 -- 103Vdc

High Power Processional Amplifier - Used Semiconductors - LM339 – 2SC5200 – 2SA1943

Power Supply

Power Amplifier 

Attack PP8002 - Power Amp Section

Click on the pictures to magnify