Tuesday, 18 February 2020

Sony LCD digital color TV - KDL-46HX900, KDL-46HX900 KDL-52HX900- Service mode, error codes, service adjustments


KDL-46HX900- Hong Kong, KDL-52HX900 & KDL-46HX900-Australia- Remote control RM-GD012 - Error codes and details, how to enter the service mode, Service adjustments
The units  contain a self-diagnostic function. If an error occurs, the STANDBY LED will automatically begin to flash.
The number of times the LED flashes translates to a probable source of the problem.
A definition of the STANDBY LED 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 LED will flash a set number.
of times to indicate the possible cause of the problem.
If there is more than one error, the LED will identify the first of the problem areas.
Result for all of the following diagnostic items are displayed on screen.
If the screen displays a “0”, no error has occurred.
self-diagnostic screen display
For errors with symptoms such as “power sometimes shuts off” or “screen sometimes goes out” 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:
Since the diagnostic results displayed on the screen are not automatically cleared, always check the self-diagnostic screen.
After you have completed the repairs, clear the result display to “0”.
Clearing the Self Check Diagnostic List
Error history and Error count: Press the Channel 8 => Channel 0
Panel operation time: Press the Channel 7 > Channel 0.
Exiting the Self-diagnostic screen
Turn off the power to the TV by pressing the POWER button on the remote or the POWER button on the TV
How to entering service mode
1) Turn on the main power switch to place this set in standby mode.
2) Press the buttons on the remote commander as follows, and entering service mode.
Service mode display.
Note: First of all, when you enter Service Mode, you can see “Digital” service mode.
Whenever you press “OPTIONS” or “JUMP” on remote, each service mode is changed. “Digital”> “Chassis”> “Sub” > “PEM”
How to use the remote commander in Service Mode
After entering service mode, then turn off the power switch.
White balance adjustment
Execute this adjustment if necessary.
Change Data of “PEM” service mode.
a. Select
“010 WB_GAIN2_A categories by pressing “2 or 5” on remote.
b. Select “000” ~ “005” item by pressing “1or4” on remote.
c. Change data “0 ~ 255” by pressing “3 / 6” on remote.
d. Press “0” or “10” to save data.
It shows red “
WRITE”. 
It indicates writing is processing.
Writing process is done after a while. (Takes about a couple of seconds)
Save changing data
1) Change Data of “Chassis” or “Sub” or “PEM” service mode
2) Write data for “Chassis” or “Sub” or “PEM” service mode
a. Press “Mute” on remote.
It shows green “
SERVICE” changes to green “WRITE”.
b. Press “0” or “enter” 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
Note: “Digital” service mode don’t have to Save. (Except “002 MODEL” category)
1) 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 “0 / 10” on remote to select item.
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 next step. Press “return”, when returning on the previous page
Write data for “Digital” service mode. ( “002 MODEL” category)
Note: This procedure operation, when replaced the B board.
Note: Do not write a wrong segment or destination information in Product ID.
When the wrong setting is written, TV may not operate.
000 SEG ・・・ Product ID - segment information.
001 DEST
・・・ Product ID – destination information.
a. Change data for each model.
b. Press “0” or “enter” on remote.
It shows red “
WRITE”. It indicates writing is processing.
c. Writing process is done at this point.
Set to shipping condition
How to do shipping condition.
a. Move to “Digital” service mode.
Press “8” on remote.
It shows green “
SERVICE” changes to green “RST-”.
Press “mute” on remote.
Added green “
EXE” after green “RST-” .
d. Press “0” or “enter” on remote. Green “
EXE-RST” changes to red “EXE-RST”. It indicates writing is processing.
After a while, red “
EXE-RST” changes to green “SERVICE”.
And all LED lights.
Writing process is done at this point.
Another way
You can set to shipping condition w/o entering Service Mode.
> “Cursor Up” on remote + “Power Key” on Front panel of the TV.
Change the emitter output level [back-light fault]
Note: To reduce the emitter LED output power strength.
Change Data of “PEM” service mode.
a. Select
“009 3D” category by pressing “2 / 5” on remote.
b. Select “000 EMIT_STR items by pressing “1 / 4” on remote.
c. Change data from “0” to “1” by pressing “3 / 6” on remote.
0: Strong (Default)
1: Weak
d. Save & Reboot.

Wednesday, 12 February 2020

JBL SUB350 Dolby Pro-Logic Surround-Amplifier/Subwoofer Schematic-general troubleshooting - schematic


Used Ics: TLO74, UPC1237HA, IC4558, STK4151, UPC1298V
200 watts
Front channels – 35 watts x 3 @ .1% THD
Surround channels – 15 watts x 2 @.1% THD
Subwoofer – 65 watts @ .1% THD
If there is no sound from any of the speakers, check the following
• Make sure the subwoofer is plugged into an active AC wall outlet.
• Make sure the Master Power Switch, located on the rear of the subwoofer, is in the “On/Standby” position.
• Make sure there is a source – for example, a VCR or television – hooked up to the TV or tape/aux input jacks on The Source.
• Make sure that the program material is playing.
• Recheck the hookup connections.
If most of the sound comes from the center-channel speaker, with little or no information from the surround channels, note the following:
Although most of today’s televisions are equipped with stereo audio output jacks, some stereo televisions have poor audio sections and are unable to provide a Dolby Pro Logic encoded signal. In the unlikely event that you experience this problem, connecting the audio outputs from your hi-fi VCR, laser disc player, DVD player, or satellite receiver directly to one of the inputs on The Source will provide a proper audio signal and allow you to enjoy true Dolby Pro Logic surround sound.
If there is no sound from the surround speakers or sound is very low, check the following:
• Check all connections between the amplifier and each of the speakers.
• Raise the surround volume from the remote control
• Make sure the TV show or movie you are watching is recorded in Dolby Surround.
If there is no sound from the center speaker, check the following:
• Make sure that the processor is in the Pro Logic mode. If it is in Phantom or Stereo mode, the center speaker will not play.
• Check the connections between the subwoofer and the center speaker.
If you have low bass output, check the following:
• Experiment with placement of the subwoofer. Remember, place the subwoofer in a corner to get maximum bass output from the system.
• Increase the level of bass, using the remote control.
• Adjust the level control on the rear of the subwoofer.
If you are having trouble picking up radio stations, check the following:
• Make sure the antenna is hooked up properly.
• Depending on your distance from the station’s transmitter, you may need to install an FM antenna on the roof or in the attic.
Schematic [Circuit diagram]

Thursday, 6 February 2020

Philips AH325 Amplificador schematic - tuner amplifier

Using BD333, BD334 Power transistors [dual]
Level meter schematic
Main schematic
Wiring diagram