Sunday, August 30, 2015

GRUNDIG W56-2020 – SERVICE MODE – ADJUSTMENTS – CIRCUIT DIAGRAM

Used ICs: TDA884x – SDA 55xx – TDA4605 - TDA8351 or TDA8356 – TDA6107 or TDA6108 – MSP3405C or MSP3415G – U4468B or TDA4445B – TDA7057A
SERVICE MODE
All other service settings of TV set are made in so called service mode of TV set operation. 
To enter this mode of operation press the keys in the following sequence: "TV", "I", and "STOP" within 5 seconds from switching on the TV set to normal mode of operation. 
When the TV set is switched over to service mode the following status line with service parameter and parameter value appears on the screen:
The parameter to be set is selected with keys (P+/P-), and selected parameter is set with keys (volume+ /volume-). Each time you press the key for parameter selection (UP/DN ) the value of pre-selected parameter is stored. Therefore when the last setting is performed you must press one of the two keys once again. Values of individual parameters are expressed in hexadecimal form due to limited capacity of the memory. Values of individual parameters are variable from 0 to 3F, with the exception of some parameters where values are changed from 0 to 7F and O1, O2, O3, O4, O5 which have value range between 0 and FF.  
When setting is finished it should obligatory be concluded with "STOP" key. After a few seconds the status line disappears and service adjustment is accomplished.
LIST OF SERVICE MODE PARAMETERS
COMPONENT LOCATION AND MEASURING POINTS FOR SUPPLY VOLTAGES ON MAIN CHASSIS – COMPONENT SIDE
FATAL ERROR DETECTION: [VIDEO PROCESSOR NOT DETECTED, or POWER UP RESET of Video Processor not finished – LED flashing with 1Hz.]
TDA8843 PIN DESCRIPTION
SDA553 and 24C16 PIN DESCRIPTION
MSP3411G (MSP3401G – MSP3405G – MSP3415G) PIN DESCRIPTION
CIRCUIT DIAGRAM
CLICK ON THE PICTURES TO MAGNIFY
DEMAGNETIZING OF PICTURE TUBE
Correctness of picture tube demagnetizing is usually automatically checked. Magnetization of picture tube is presented as one or more color "clouds", consequently color reproduction of the picture is not correct.  Each time the TV set is switched on with mains switch, demagnetizing system is activated. For correct demagnetizing procedure disconnect the TV set with mains switch and leave it disconnected for about 15 minutes. Afterwards when you switch on the TV, demagnetizing procedure is performed. In case distortion of color reproduction still persists, special demagnetizing coil should be used.

GRUNDIG K15 PFCD 2602 TXT CRT TV DVD – SERVICE MODE – ADJUSTMENTS – CIRCUIT DIAGRAM

K15 PFCD 2602 TXT (GML2300)
TDA9351PS/N2 or TDA9381PS/N2 – TEA1507 (SMPS Control) – BSC25-N1641A (LOT) – 24MC08 (Memory)
MEMORY IC REPLACEMENT
This TV uses memory IC. In the memory IC are memorized data for correctly operating the video and deflection circuits.
PROCEDURE FOR REPLACING MEMORY IC
> Switch the power off and unplug the power cord from AC outlet.
> Be sure to use memory IC written with the initial data values.
> Plug the power cord into the AC outlet and switch the power on.
Check and set SYSTEM default value:
Press “MENU” x3+1752 buttons in sequence to enter into factory status.
> If the memory IC haven’t been written with the initial data, press [P+] / [P-] to select item INIT and press [V+] / [V-] to start initialize memory IC.
> Check the setting value of the SYSTEM default value of Table below. If the value is different, select items by [P+] / [P-] keys and set value by [V+] / [V-] keys.
> Press “TV/AV” button to return to the normal screen.
SERVICE ADJUSTMENTS
Specific operation: use remote controller
Press “MENU” x3+1752” buttons in sequence to enter into factory mode.
Press [P+] / [P-] to select items and press [V+] / [V-] key, to make data adjustment of corresponding factory menus.
Press “AV/TV” key to exit factory mode.
Focus adjustment
> Receive a crosshatch signal.
> While watching the screen, adjust the FOCUS VR on the FBT to make the vertical and horizontal lines as fine and sharp as possible.
Geometrical adjustment
Receive PAL standard complete pattern signal.
Adjustment steps
> Adjust VSL, to the centre horizontal line just appears from half bottom shadow.
> Adjust VAM, to get 92% of vertical picture contents would be displayed on CRT.
> Adjust VSH, the centre horizontal line corresponds to CRT vertical centre.
> Adjust SCL, to the linearity of P card field is in proper condition.
> Adjust HSH, to get the picture horizontal centre correspond to CRT horizontal centre.
Receive NTSC signal and repeat above adjustment.
AGC Adjustment
Receive 60dBμ (1mV) VH color bar pattern signal.
Select TOP item.
Adjust value, to noise reduce gradually and just disappeared point.
CRT cut off and white balance adjustment
a CRT cut off adjustment
> Select item VG2B, then adjust value to 32.
> PRESS “0” key, when the screen shows”VG2” adjust the SCREEN control on Fly back transformer to make the screen show alternating flashing characters of “INSIDE HIGH INSIDE LOW”.
b White balance adjustment
> Receive a Black and White pattern.
> Adjust WRP, WRG, WRB items to get color temperature 9300K ±3 JND.
MAIN BOARD CIRCUIT DIAGRAM
TDA9351 PIN DETAILS
NICAM OPTION
STEREO OPTION
SMPS CIRCUIT DIAGRAM
DVD Part: Introduction of MTK1389D maintenance
NOTE: MTK1389D is a type of LSIC for DVD decode .MTK1389D IC consists of RF,SERVO,DSP,DECODE,VIDEO DAC and AUDIO DAC.
1. Under normal power supply conditions, the maintenance plan for MT1389D mono-chip is: first the reset circuit resets the MT1389D, after the crystal oscillator circuit gave the clock signal to MT1389D, MT1389D will start the initialization check for Flash E2PROM SDRAM, after everything is checked to be normal, it will start initialization check for built-in Audio DAC, servo and motor Driver IC .
2. If the all the a.m. parts are good, then MT1389D will send signal to motor Driver to drive the servo system pick up then to generate DVD light for collection, tracing the main shaft to check if there is any disc, and confirm if it is CD format or DVD format disc. If the disc is in DVD format, the system will read the data from the disc directly; if it is in CD format built-in servo will drive the CD laser to send out CD light and read the data, the data then will be amplified through built-in RF amplifier and sent to MT1389D decode part for data processing, released by MPEG and resolved into video data and audio data, then they will be returned to analog signals through built-in VIDEO DAC AUDIO DAC.
Decoder section
3. There is power supply, clock and reset, but the system does not work.
- Check if all the address wires required for FLASH are exist, and if they are in normal status, especially check if the A0~A15 of FLASH have normal signals, if there aren’t, then inspect MT1389D to see if there is faulty soldering. If there are normal signals at A0~A15, check if the address data signal of MT1389D and SDRAM is normal. If it is normal, then check the signal at A16~A19 of MT1389D; if there are also signals, then check the video output wires and AV filter circuit; if there is no signal, then check the corresponding pins of MT1389D to see if there is any short circuit, break or faulty soldering.
4. System in normal operation, but the audio has no sound.
- Because the AUDIO DAC is built in MTK1389D IC.you need to check the lower passing amplifying circuit and the MUTE circuit at the back of the LPF circuit. Also check if there is any power supply to the LPF circuit.
- Check if the power supply voltage required for playing is at normal level.
Servo Section
5. After the LOGO of the machine shows normally, there is no OSD display. This problem mainly is caused by the abnormality built-in RF and servo, possible problems may be:
- Built in RF and its surrounding circuits have problems.
- Servo part of MT1389D has problems.
6. OSD display is normal while there is no action of servo part feeding motor does not work, main shaft does no turn, possible fault status are:
- The corresponding signals giving by MT1389D to DMSO FMSO are missing, the reason may be the problem of MT1389D or the communication between MT1389D and motor Driver IC SA5668.
- Not output from Motor Driver, the reason may be the problem on motor Driver or its corresponding circuit.
7. Servo part in good status, while there is no pick up action no light, no focus
- No light, check the power supply power supply for pick up , or the light producing driving circuit to see if they are in normal status.
- No focus, check MT1389D to see if there is signal output from FOSO TRSO. Secondly, check motor driver to see if there is F+ F- T+ T-signal output.
Thirdly, check the external corresponding circuit of the motor driver to see if there is any problem.
8. All the servo part has action, while it cannot read out the disc
- Check MT1389D if there is RF net picture output, if there isn’t, then it must be the problem of MT1389D and external surrounding circuits, it there is output, then it might the problem of MT1389D and its surrounding circuits.
- There is RF signal but not in normal status then check MT1389D and surrounding circuits.
- Everything is normal, but the disc cannot be read out, check MT1389D and its surrounding circuit.

Friday, August 28, 2015

TOSHIBA 19DV616DG 22DV616DG LCD TV/DVD COMBINATION – HOW TO ENTER SERVICE MODE – HOTEL MODE – PARENTAL CONTROL CANCELLATION – SOFTWARE UPDATE – SMPS SCHEMATIC

How to take out disc in emergency – How to enter Service Mode – Replacing the EEPROM IC and adjustments – Unlock the parental control password -  Power Supply Circuit Diagram - TOSHIBA 19V616 - TOSHIBA 22DV616 LCD TVA- LCD TV-DVD Combination.
SMPS CIRCUIT: USED ICs - KIA431A-AT (Voltage regulator) _ MP1580HP _ FA5571N-D1 (Power Control)
DISC REMOVAL METHOD AT NO POWER SUPPLY - (Disc removal at Emergency)
1. Remove the Stand, Front Cabinet Ass'y and LCD Panel.
2. Slide the Gear Middle toward the arrow direction by hand to release the lock.
3. Take out the Disc from the DVD Deck. Be careful not to scratch on the Disc.
PARENTAL CONTROL - RATING LEVEL & 4 DIGIT PASSWORD CANCELLATION.
FOR DVD MODE
If the stored 4 digit password in the Rating Level menu needs to be cancelled, please follow the steps below.
1. Turn Unit ON.
2. Set the DVD to the Stop Mode.
3. Check that “No disc” is displayed on the screen.
4. Press and hold the “STOP” button on the front panel.
5. Simultaneously press and hold the “7” key on the remote control unit.
6. Hold both keys for more than 2 seconds.
7. The On Screen Display message “PASSWORD CLEAR” will appear.
8. The 4 digit password has now been cleared.
FOR DTV MODE
If the stored 4 digit password in the Rating Level menu needs to be cancelled, please follow the steps below.
1. Turn on the power.
2. Set the VOLUME to minimum.
3. Press both VOL. DOWN button on the set and Channel button (3) on the remote control for more than 2 seconds.
4. The 4 digit password has now been cancelled. [NOTE: No indications on the screen when the Parental Lock is setting.  Initializing password is 0000.]
HOTEL MODE FUNCTION
In power on mode, set the VOLUME to minimum.
> Press and hold the VOLUME DOWN button on the side panel.
> Simultaneously press and hold the channel button (7) on the remote control for more than 2 seconds.
> The Hotel mode setting menu will appear.
> Using the UP/DOWN button on the remote control, select the desired mode. Then press the ENTER button.
> Using the LEFT/RIGHT button on the remote control, set the mode to desired setting.
The Hotel mode has now been set up.
To Re-set the Hotel mode
1. In power on mode, set the VOLUME to minimum.
2. Press and hold the VOLUME DOWN button on the side panel.
3. Simultaneously press and hold the channel button (7) on the remote control for more than 2 seconds.
4. The Hotel mode setting menu will appear.
5. Using the UP/DOWN button on the remote control, select the RESET.  Then press the ENTER button.
6. The setting items have now been returned to initial value.
Note-1 Even if setting it to "No Respond", the service mode function are effective.  Note 2 - If setting it to "OFF", it start up in same input source when you turn off the power before.
TRAY LOCK
The disk cannot be taken out by setting the Tray Lock, please follow the steps below.
1. Turn Unit ON.
2. Set the DVD to the Stop Mode.
3. Press it in order of "SEPUP", "SUBTITLE", "3", "AUDIO SELECT" and "0" key of a remote control unit.
4. The On Screen Display message will appear.
5. The Tray Lock has now been set up.
To unlock the Tray Lock, please follow the steps below.
1. Turn Unit ON.
2. Set the DVD to the Stop Mode.
3. Press it in order of "SETUP", "SUBTITLE", "3", "AUDIO SELECT" and "0" key of a remote control unit.
4. The On Screen Display message will appear.
5. The Tray Lock has now been cleared.
Power circuit
SERVICE MODE LIST
To enter to the SERVICE MODE function, press and hold both buttons simultaneously on the main unit and on the remote control for more than a the standard time in the appropriate condition.
Press the following remocon keys continuously.
SETUP > SUBTITLE > 3 > AUDIO SELECT > 0
The disk cannot be taken out. [Refer to the "TRAY LOCK".]
RE-WRITE FOR DVD FIRMWARE
>Turn on the power, and set the DVD mode.
> Confirm that the "No Disc" will be appeared on the screen.
Press both VOL. DOWN button on the set and Channel button (5) on the remote control for more than 2 seconds.
> Press VOL. UP/DOWN button on the unit to check if all the keys on the unit do not function.  NOTE: To check if DVD Write mode is set.  When inserting Up-Date Disc at Non DVD Write mode, the read error will happen.
> Insert the Up-Date Disc. (Refer to SERVICING FIXTURE AND TOOLS)
> Automatic read will start and "Firmware upgrade Please Wait" will be displayed on the screen.  At this time, the horizontal noise lines may appear. But no problem.  NOTE: Do not turn off the unit on the way or operate the keys on the unit and remocon.  Up-Date error will happen and cannot be done with the Up-Date of Up-Date Disc.
> Unplug the AC cord, then plug it in.  After the write, set to the initializing of shipping.
> Turn on the power, and set the DVD mode.
> Press both VOL. DOWN button on the set and Channel button (4) on the remote control for more than 2 seconds.
The "INITIALIZE 5 > COMPLETE" will appear on the screen.  Then unplug the AC cord, and plug it in.
CHECK FOR THE FIRMWARE VERSION
> Turn on the power, and set the DVD mode.
> Press both Channel button (1) on the remote control and the STOP button on the set for more than 2 seconds.  Firmware version will be displayed on the top left of the screen.
When the changed version displays, the Re-write will be completed. 
>Turn off the power.
WHEN REPLACING EEPROM (MEMORY) IC
Initial total of MEMORY IC, POWER ON total hours and MICON VERSION can be checked on the screen. Total hours are displayed in 16 system of notation.
If you set a factory initialization, the total hours is reset to "0".  Refer to "CONFIRMATION OF INITIAL DATA" when SUM DATA is not corresponding.
1. Turn on the POWER, and set to the ALL mode.
2. Set the VOLUME to minimum.
3. Press both VOL. DOWN button on the set and Channel button (2) on the remote control for more than 2 seconds.
4. After the confirmation of each check sum, turn off the power.  NOTE: The each item value might be different according to each set.
CONFIRMATION OF INITIAL DATA
If a service repair is undertaken where it has been required to change the MEMORY IC, the following steps should be
taken to ensure correct data settings while making reference to INITIAL SETTING TABLE (Attached "INITIAL DATA").
1. Turn on the POWER, and set to the ALL mode.
2. Set the VOLUME to minimum.
3. Press both VOL. DOWN button on the set and Channel button (6) on the remote control for more than 2 seconds.  ADDRESS and DATA should appear as FIG.  NOTE: No need to set data other position than 0D00~0E3F and 1000~7FFF.
4. ADDRESS is now selected and should "blink". Using the UP/DOWN buton on the remote, step through the ADDRESS until required ADDRESS to be changed is reached.
5. Press LEFT/RIGHT button to select DATA. When DATA is selected, it will "blink".
6. Again, step through the DATA using UP/DOWN button until required DATA value has been selected.
7. Pressing LEFT/RIGHT button will take you back to ADDRESS for further selection if necessary.
8. Repeat steps 4 to 6 until all data has been checked.
9. When satisfied correct DATA has been entered, turn POWER off (return to STANDBY MODE) to finish DATA input.  After the data input, set to the initializing of shipping.
10. Turn on the Power.
11. Set the VOLUME to minimum.
12. Press both VOL. DOWN button on the set and Channel button (1) on the remote control for more than 2 seconds.
13. After the finishing of the initializing of shipping, the unit will turn off automatically.  The unit will now have the correct DATA for the new MEMORY IC.
CONFIRMATION OF CHECK SUM, POWER ON TOTAL HOURS AND MICON VERSION
Initial total of MEMORY IC, POWER ON total hours and MICON VERSION can be checked on the screen. Total hours are
displayed in 16 system of notation.
NOTE: If you set a factory initialization, the total hours is reset to "0".  Refer to "CONFIRMATION OF INITIAL DATA" when SUM DATA is not corresponding
1. Turn on the POWER, and set to the ALL mode.
2. Set the VOLUME to minimum.
3. Press both VOL. DOWN button on the set and Channel button (2) on the remote control for more than 2 seconds.
4. After the confirmation of each check sum, turn off the power.  NOTE: The each item value might be different according to each set.  If a service repair is undertaken where it has been required to change the MEMORY IC, the following steps should be taken to ensure correct data settings while making reference to INITIAL SETTING TABLE (Attached "INITIAL DATA").
1. Turn on the POWER, and set to the ALL mode.
2. Set the VOLUME to minimum.
3. Press both VOL. DOWN button on the set and Channel button (6) on the remote control for more than 2 seconds.  ADDRESS and DATA should appear.  NOTE: No need to set data other position than 0D00~0E3F and 1000~7FFF.
4. ADDRESS is now selected and should "blink". Using the UP/DOWN button on the remote, step through the ADDRESS until required ADDRESS to be changed is reached.
5. Press LEFT/RIGHT button to select DATA. When DATA is selected, it will "blink".
6. Again, step through the DATA using UP/DOWN button until required DATA value has been selected.
7. Pressing LEFT/RIGHT button will take you back to ADDRESS for further selection if necessary.
8. Repeat steps 4 to 6 until all data has been checked.
9. When satisfied correct DATA has been entered, turn POWER off (return to STANDBY MODE) to finish DATA input.  After the data input, set to the initializing of shipping.
10. Turn on the Power.
11. Set the VOLUME to minimum.
12. Press both VOL. DOWN button on the set and Channel button (1) on the remote control for more than 2 seconds.
13. After the finishing of the initializing of shipping, the unit will turn off automatically.  The unit will now have the correct DATA for the new MEMORY IC.
SMPS SCHEMATICS (Circuit Diagram) & PWB
CLICK ON THE PICTURES TO MAGNIFY

GRUNDIG LCD TV Power Supply VRA194-04 SMPS CIRCUIT DIAGRAM

Grundig LCD TV - SMPS Schematic VRA 194-04
COMPONENT SIDE
SOLDER SIDE

Thursday, August 27, 2015

LG PLASMA TV LG - LG42PM1M TROUBLESHOOTING

Plasma Monitor troubleshooting - LG 42PM1M/MA - LG 42PM1M/MA-ZA


NO POWER
Does’t minute discharge at module.
None does not come in into the front LED.
PROTECT MODE
After once shining, it does not discharge minutely from module.
The Rely falls (The sound is audible “click”)
It is converted with the color where the front LED is red from green.
NO RASTER
Doesn’t minute discharge at module.
It maintains the condition where the front LED is green.
In case of occurring strange screen into specific mode. The OSD does not display.
LED is green.
The minute discharged continuously becomes accomplished from module.
In case of doesn’t display the screen into specific mode
The screen does not become the display from specific input mode (RF, AV, Component, RGB, DVI).
Check the all input mode should become normality display.
Check the Video (Main)/Data (Sub), Video (Main)/ Video (Sub) should become normality display from the PIP mode or DW mode. (Re-Check it Swap).
In case of becomes unusual display from RF mode
In the case of becomes unusual display from RF, AV mode.
In the case of becomes unusual display from Component, RGB mode
In the case of becomes unusual display from HDMI mode
In case of no sound
LED is green
Screen display but sound is not output.
SMPS [Power regulator] BOARD CONNECTOR VOLTAGES.
Sony & Sanken power boards are used with different sets.
SONY POWER BOARD STRUCTURE
SANKEN POWER BOARD STRUCTURE
CLICK ON THE PICTURES TO ZOOM IN

Tuesday, August 25, 2015

SONY HCD-EC68P HCD-EC78P - COMPACT DISC RECEIVER - DISASSEMBLY - POWER AMPLIFIER SCHEMATIC

HCD-EC68P is the amplifier, CD player and tuner section in MHC-EC68Pi.
HCD-EC78P is the amplifier, CD player and tuner section in MHC-EC78Pi.

Model Name Using Similar Mechanism
CDM77B-K6BD90-WOD: NEW
CDM88A-K6BD90-WOD: HCD-EC68
Mechanism Type
Except EC78P (UK): CDM77B-K6BD90-WOD
EC78P (UK): CDM88A-K6BD90-WOD
Base Unit Name
BU-K6BD90-WOD
Optical Pick-up Block Name
KSM-213DCP
HCD-EC78P: UK model
Power output (rated):
Low channel
50 W + 50 W (at 8 Ω, 1 kHz, 1% THD)
High channel
50 W + 50 W (at 8 Ω, 8 kHz, 1% THD)
RMS output power (reference)
Low channel
70 W + 70 W (per channel at 8 Ω, 1 kHz, 10% THD)
High channel
HCD-EC68P
RMS output power (reference)
70 W + 70 W (per channel at 6 Ω, 1 kHz, 10% THD) W (per channel at 8 Ω, 8 kHz, 10% THD)
HOW TO TAKE OUT THE DISC IN EMERGENCY [POWER OFF]
HOW TO REMOVE THE VOLUME CONTROL KNOB
CAPACITOR DISCHARGE FOR ELECTRIC SHOCK PREVENTION
FRONT PANEL BLOCK (EC78P: UK)
MECHANISM BELTS
HI & LOW AMPLIFIER CIRCUIT DIAGRAM