Philco PH28B25DG LED TV - Schematic

Using Ics: MP1582, MP1495, MP2143,  NC/AZ1117, RD29581G, TC58NVG0S3ETA00, M24C32MN/NC, RT910NBGCP, 7N65(SMPS FET), TEA1733(SMPS CONTROL), MC34063, MP3394

DENON AVR-1909 - AVR-789 - AVC-1909 - Factory reset - Micom version check - error check - Idle current adjustment

DENON AVR-1909 - AVR-789 - AVC-1909

Initializing AV SURROUND RECEIVER/AMPLIFIER
AV SURROUND RECEIVER/AMPLIFIER initialization should be performed when the µcom, peripheral parts of µcom, and Digital P.W.B. are replaced.
1. Switch off the unit.
2. With the "INPUTMODE" and "SPEAKERS" buttons pressed, press the "ON/OFF" button to turn the power on.
3. Check that the entire display is flashing with an interval of about 1 second, and release your fingers from the 2 buttons and the microprocessor will be initialized.

Note: If step 3 does not work, start over from step 1.
# All user settings will be lost and this factory setting will be recovered when this initialization mode.
So make sure to m+emorize your setting for restoring after the initialization.

JIG to use for servicing
When you repair the printing board, you can use the following
JIG (Extension cable kit). Please order to Denon Official Service Distributor in your region if necessary.
00D SPK- 561 EXTENSION UNIT KIT : 1 Set
00D SPK- 562 9120 CONN. JOINT KIT : 1 Set
When you update the firmware, you can use the following
JIG (RS232C to internal connector conversion adapter with
8P cable kit ). Please order to Denon Official Service Distributor in your region if necessary.

Check mode for Micom/DSP version
Micom/DSP Version Display Mode
1. Operation specifications
µcom/DSP version display mode:
When started up, the version information is displayed.
Starting up:
# E3, EA, JP model
With the "DYN VOL" and "VIDEO SELECT" buttons pressed, press the "ON/OFF" button to turn the power on. Now, press the "STATUS" button to the display the 2^nd item information on the FL Display.
# E2 model
With the "DYN VOL" and "RDS" buttons pressed, press the "ON/OFF" button to turn the power on. Now, press the "STATUS" button to the display the 2^nd item information on the FL Display.

2. Display Order
Destination information > Main-µcom version information >  DSP version information

PROCEDURE FOR CHECKING ERRORS
Displaying the protection history
1. Operation specifications
ERROR MODE(displaying the protection history)
When started up, the error information is displayed.
Starting up:
With the "MENU" and "MULTEQ" buttons pressed, press the "ON/OFF" button to turn the power on. The error (protection history display) mode is set. Now, press the "STATUS" button to turn on the FL display.

2. About the display on the FL display
When the "STATUS" button is pressed after setting the error (protection history display) mode, a history like the one shown below is displayed, depending on the conditions.
(1) Normally (when there has been no protection incident

(2) For ASO/DC (when the last protection incident was ASO or DC protection)

(3) For THERMAL (when the last protection incident was THERMALprotection)

When the "STATUS" button is pressed again after the above protection history is displayed, the normal display reappears.

3. Clearing the protection history

There are two ways to clear the protection history, as described below.
(1) Start up the error (protection display) mode, display the error, then press and hold in the "ENTER" button for 3 seconds.

Press and hold in the "ENTER" button for 3 seconds

The protection history is cleared.

2) Initialize.
# If you want to save a backup, use the method in 3.(1) above.
Warning indication by the STANDBY LED
If the power is turned off when a protection incident has been detected, the STANDBY LED (red) flashes as follows as warning according to the conditions in which the protection incident occurred.
(1) ASO/DC PROTECTION : Flashes in cycles of 0.5 seconds (0.25 seconds lit, 0.25 seconds off)
(2) THERMAL PROTECTION : Flashes in cycles of 2 seconds (1 second lit, 1 second off)

Idling Current adjustment
Required measurement equipment: DC Voltmeter
1. Preparation
(1) Avoid direct blow from an air conditioner or an electric fan, and adjust the unit at normal room temperature 15 °C > 30 °C (59 °F > 86 °F).
(2) Presetting
# POWER (Power source switch) OFF
# SPEAKER (Speaker terminal) No load (Do not connect speaker, dummy resistor, etc.)
2. Adjustment
(1) Remove top cover and set VR101 FL, FR, C, SL, SR, on Main Amp. Unit, VR401, VR402 on 2ch- Amp. Unit at fully counterclockwise position.
(2) Connect DC Voltmeter to test points (FRONT-Lch: TP101, FRONT-Rch: TP105, CENTER ch: TP103, SURROUND-Lch: TP102, SURROUND-Rch: TP104, SURROUND-BACK Lch: TP401, SURROUND-BACK Rch: TP402).
(3) Connect power cord to AC Line, and turn power switch "ON".
(4) Presetting.
MASTER VOLUME : "---" counterclockwise (c min.)
SPEAKER (Speaker terminal) : No load
(Do not connect speaker, dummy resistor, etc.) MODE : 7CH STEREO (5CH STEREO)
FUNCTION : CD
(5) Within 2 minutes after the power on, turn VR101 clockwise to adjust the TEST POINT voltage to 1.5 mV ± 0.5 mV DC.
(6) After 10 minutes from the preset above, turn VR101 to set the voltage to 2.0 mV ± 0.5 mV DC.
(7) Adjust the Variable Resistors of other channels in the same way.

ONKYO TX-RZ900 AV Receiver - Factory reset procedure - Self diagnosis - Firmware checking and updating procedure - Troubleshooting

 Factory reset procedure - Self diagnosis - Firmware checking and updating procedure - Troubleshooting ONKYO TX-RZ900 AV Receiver

 Resetting the Unit

# How to reset:

Step:1

While holding down CBL/SAT on the main unit (note that step 2 must be performed with this button pressed down)

Step:2

Press ON/STANDBY on the main unit. ("Clear" appears on the display and the unit returns to standby.)

# Do not unplug the power cord until "Clear" disappears from the display.

# How to reset the remote controller:

Step:1

While holding down RECEIVER on the remote controller, press Q until the remote indicator stays lit (about 3 seconds).

Step:2

Within 30 seconds, press RECEIVER again.

Self-diagnostics

This function is For avoiding the rupture of electrolytic capacitors with amplifier circuit failure during power-ON.

Operation of Self diagnostic

Self-diagnostic will start at the timing of next power on, after goes to the protect mode by Current detection or DC voltage detection.

Only On/Standby key could work in this mode. Also remote control does not work.

However, the CLEAR operation is enabled.

During Self-diagnostic, the power supply for amplifier circuit become low voltage state(SEC1-LOW), and the speaker relay will be turned off. Then, MPU will check each amplifier circuits internally by entering the test signal (20 kHz,-20 dBFS sine wave) to each channel from DSP.

MPU will judge the amplifier circuit is good or not from VOLH value.

The normal range of VOLH value is 0.04 V < VOLH < 0.20 V.

If VOLH value is in the out of this range, it will be judged as NG (No good).

No problem found

When protected by current detection, and no problem found, "CHECK SP WIRE“ will be displayed in this State, Only the On/Standby key is effective. And it do not anything for 3 minutes, unit goes into stand by automatically.

When protected by a DC voltage detection, and no problem found, unit goes into normal operation.

Problem found

When judged as there is a problem on any channel, the information of channel that has a problem will be displayed. In this State, Only the On/Standby key is effective. Also remote control does not work. if do not anything for 3 minutes, unit goes into standby automatically. This state will keep also after unit turn on/off, or AC unplugged.

The power supply for the amplifier becomes low voltage state and the speaker relay will be turned on.

Repair Process and How to Confirm

Confirmation of the protect cause

While NG channel is displayed, You can confirm the protect cause by following the step below

1. Press the Enter button

2. The protection causes are displayed for 5 seconds.

Please check the around of those amplifier circuit and repair it.

Clear of NG CH information

After repair, you can clear NG CH information by following the steps below.

1. Press the On!Standby key while pressing the Enter key.

2. Display as in the right figure appears.

3. Unit goes into Standby automatically after 5 seconds.

Self-diagnostic will start again at the timing of next power on.

By this, You can verify whether repair was properly or not.

If problem found after repair, please re-check the around of its circuit.

Cancel of Self-diagnostic

You can cancel this mode by clear operation (press Standby key while pressing CBL/SAT key)

After cancel this mode, receiver will be started as normal operation.

How to check Firmware Version & Preparation of Update

Step1 : [DISPLAY] + [ON/STANDBY] x 2

Main Firmware Version will appear on the main unit’s display.

Step2 : [TONE +]

NET Firmware Version will appear on the main unit’s display.

Step3 : [TONE +]

DSP Firmware Version will appear on the main unit's display.

Step4 : [TONE +]

VIDEO Firmware Version will appear on the main unit’s display.

Step5 : [TONE +]

OSD Firmware Version will appear on the main unit’s display.

Step6 : [TONE +]

V8100 Firmware Version will appear on the main unit’s display ( DTR-40.7 only)

Preparation of Update

How to update (service mode)

Overwriting is also possible.

1.Turn on the unit. It takes some time to start after you switch on the unit.

2.Select the USB input source.

3.Connect the USB storage device to USB port on the unit. Wait until Initializing of USBINET finishes.

4.Hold down [DISPLAY] button and then press [ONISTANDBY] button twice.

Main version will be displayed, and HYBRID STANDBY indicator will start to flash.

5.Press [RETURN] button. “NET -> ALL_D" will be displayed.

6.Select "USB -> ALL_D" by [PRESET(left/right)] cursors and [TUNING(up/down)] cursors, then press [ENTER] button, updating will begin.

7.Wait until update is completed. When the update ends, "Completed!" is displayed (if you leave it, it automatically turns standby mode. )

8.Press [ON/STANDBY] button, and the unit turns on.

9.Check the new FW version number.

Note:If the procedure might not be successful, please select "USB -> ALL_M”.

TROUBLESHOOTING

No Sound

No sound from connected player

# Chose input selector which is assigned to connected input terminal ?

# Isn't muting on ?

No sound from connected TV

# Chose wrong input selector ?

# Connect to this model's HDMI OUT terminal from TV by HDMI cable ?

# When TV supports ARC function, connect to his model's HDMI OUT terminal from TV's HDMI input terminal for ARC function ?

# When TV doesn't support ARC function, connect TV to this model with optical cable etc. ?

# Isn't muting on ?

No sound from some connected loudspeaker(s)

# No sound loudspeaker(s) config is enabled ?

No sound from all connected TV or Bluray player etc.

# After chose loudspeaker volume level setting, test tone is OK ?

No problem about above items

# Unplug power cord

After 10 seconds, connect power cord again.

# Execute Reset 

NO Picture

In general

# Connection cable is bent , twisted or damaged ?

# Input is switched on TV ?

No picture from connected player by HDMI input terminal

# Chose input selector which is connected to player ?

# Listening mode is not Pure Audio ?

# Don't use HDMI-DVI adaptor. From personal computer ?

No picture from connected player by component video terminal

# Output to TV connected to component video out terminal from player's picture connected to the composite video input terminals ?

No problem about above items

# Unplug power cord

After 10 seconds connect the power cord again

# Execute Reset 

No Power

In general

# Doesn't be connection cable bent, be it twisted and be it damaged?

There is time when indication on the front panel doesn't just light up.

# Please check the connecting cord of a DISPLAY PCB.

No problem about above items

# Unplug power cord

After 10 seconds, connect power cord again

# Execute Reset.

How to disassemble - Dell Adamo XPS – How to remove the keyboard – how to remove Solid state driver – AC adapter specification

Dell Adamo XPS - AC Adapter specification

Type DA45NM102-00

Input voltage (nominal) 100 V – 240 V (nominal)

Input current (maximum) 1.5 A (continuous)

Input frequency 50 Hz – 60 Hz (single phase nomina

Output power (maximum) 45 W Output current (maximum) 3.21 A.

DISASSEMBLING PARTS 

How to remove the Computer Battery

1. Follow the instructions in Before You Begin.

2. Turn the computer over.

3. Slide and hold the battery release latch.

4. Using the grip on the computer battery, push the computer battery towards the computer and rotate it upwards.

5. Lift the computer battery out of the computer.

How to remove the Coin-Cell Battery

1. Follow the instructions in Before You Begin.

2. Remove the computer battery

3. Open the display

4. Remove the palm rest assembly

5. Disconnect the coin-cell battery cable from the connector on the system board.

6. The coin-cell battery is glued to the system board. Using a plastic scribe pry the coin-cell battery out of the system board.

How to remove the Bridge Battery

1. Follow the instructions in Before You Begin.

2. Remove the computer battery

3. Open the display

4. Remove the palm rest assembly

5. Disconnect the bridge battery cable from the connector on the left daughter board.

6. The bridge battery is glued to the base cover. Using a plastic scribe pry the bridge battery out of the base cover.

How to remove the Display Assembly

1. Follow the instructions in Before You Begin.

2. Remove the computer battery

3. Open the display

4. Remove the palm rest assembly

5. Remove the Bluetooth card

6. Remove the WLAN card

7. Make note of the antenna cable routing and the tape placement.

8. Disconnect the following cables from their corresponding connectors on the system board:
# display cable — lift the tab and pull the cable away from the connector
# left I/O board cable — lift the tab and pull the cable away from the connector
# battery power cable — pull the cable away from the connector
# AC adapter power cable — pull the cable away from the connector
# right I/O board cable — lift the tab and pull the cable away from the connector

9. Remove the two screws that secure the display assembly to the computer base.

10. Slide and lift the computer base away from the display assembly.

How to remove the Solid State Drive

1. Follow the instructions in Before You Begin.

2. Remove the computer battery

3. Open the display

4. Remove the palm rest assembly

5. Remove the screw that secures the solid state drive to the computer base.

6. Slide and lift the solid state drive to disconnect it from the connector on the right daughter board.

How to remove the Keyboard

1. Follow the instructions in Before You Begin.

2. Remove the computer battery

3. Open the display

4. Remove the palm rest assembly

5. Remove the four screws that secure the keyboard to the computer base.

6. Ease the keyboard up using a plastic scribe.

7. Carefully rotate the keyboard away from the computer as indicated in the following illustration.