Electrohelponline: September 2012

Thursday 27 September 2012

SHARP 63CS-03SN _ SERVICE MODE

Swich OFF the TV by its front Power Switch.
Press and Hold [Channel + & Volume ( - ) ] buttons at the front panel of the TV, Switch On the TV by its front panel Power Switch.
Service Menu will be displayed.
To select an item to adjust, use Prog + | Prog - button on the remote control.
To adjust the data value, use Vol + | Vol - button on the remote control.
To save the new values in memory and to 'Exit' service mode, press 'Standby' button on the remote control.

SHARP 25G M60 _ SERVICE MODE

Locate the test points [TP2001 & TP2002], near IC 2001.
Short these test points for one second.
Service mode window will be displayed.
To call an item to adjust, use Chennel Up | Channel Dn buttons on the remote control.
To adjust the data value to selected item, use Vol Up | Vol Dn buttons on the remote control.
To Exit service mode, Switch Off the TV by its main power button at the front panel.

SHARP WONDER & SHARP UNIVERSE _ SERVICE MODE

Press "Menu" button on the remote control.
Select 'Feature'.
Select 'Blue Back'.
Activate 'Blue Back'
Press ( -/---) button on the remote control for more than 5 seconds.
Enter the code [1 => 3 => 7 => 9].
Service Menu window will be displayed.
Use Prog Up/Prog Dn & Vol Up | Vol Dn buttons to select items, and to adjust the data values.
Press (V +) button to "Exit' service mode.

SIEMENS FS-369M4 _ CS-9409 SERVICE MODE

Power ON the TV.
Press "Info" => Special Functions => Service => 0,8,9.
Service mode window will be displayed.
To exit service mode, switch OFF the TV
To call an item to adjust, use Ch Up \ Ch Dn buttons.
To adjust the data value to selected item, use Vol Up | Vol - buttons.

SHARP LC-13AV4U _ SERVICE MODE

Unplug the TV from AC mains wall socket.
Simultaneously press [Volume ( - ) & Input], re-connect the TV to AC mains.
The TV will come On with service mode with letter "K" on the screen displayed.
To call an item to adjust, use Channel Up | Channel Down buttons.
To adjust the data value to selected item, use Volume Up | Volume Dn buttons.
Switch off the TV by AC mains switch [by pull out the AC cord from AC wall socket] to "Exit' Service mode.

SHARP EURO DS-1 CTV _ SERVICE MODE

Short contact '2' & '6' on the Digital Module, and press 'Mode" button on the remote cotnrol.
Use Ch + | Ch - buttons to select and item to adjust.
Use Vol + | Vol - buttons on the remote control to adjust the data value to selected item
Switch OFf the set by its main power control switch to 'Exit' Service Mode.

LG SERVICE MODE [FACTORY MODE]

TO ENTER SERVICE MODE

simultaneously press and Hold "Menu" & "Channel Up" buttons on the TV for 3 seconds.
Press CH+ | CH - buttons to select an item to adjust.
Press Vol + | Vol - buttons to adjust the data value to selected item.

HAIER LD 2010A _ SERVICE MODE [FACTORY MODE]

TO ENTER SERVICE MODE

Press "Display" key, and then press color key [Red => Green => Yellow => Display] keys by remote control in sequence.
Factory [2] will be displayed on screen.
To call an item to adjust, use Prog Up | Prog Dn keys.
To adjust the data value to selected item, use Vol + \ Vol - keys.
Press 'OK' key to return to normal screen.

AKIRA TB-1238 _ TB-14BS3 _ TB 21BSS3W_HOW TO ENTER SERVICE MODE.

into channel '12' by pressing '1 & 2' buttons on the remote control.
Then press '3' & '8' to go to channel 38.
Press 'Menu, Menu lock and Mute.
Enter numbers {1 > 2 > 3 > 8].
Factory mode will be displayed.

AKAI CT-V252NTF - HOW TO ENTER SERVICE MODE

Press the "Menu' button.
In menu is displayed, enter {4,7,2,5} by the remote control.
Service Mode will be displayed.
Use, Red, Green, Blue & Yellow buttons on the remote control to select item.
To adjust the data value to selected item, use Volume Up | Volume Dn buttons on the remote control.
Press 'OK' button to save the settings.
Press 'Menu' button to 'Exit' Service Mode.

ALBA CTV 3418 11AK36 _ HOW TO ENTER SERVICE MODE

Press "Menu" button to display customer menu.
Enter [4 => 7 => 2 => 5] in quick succession, withing '5' seconds.
Use 'Red', 'Blue', 'Green' & 'Yellow' buttons to call an item to adjust, and to adjust the data value to selected item.
Press 'OK" button to save the changes.
Press "Menu" button to 'Exit' Service Mode.

APEX CN-12C2 GT 15_20_24_27_32 _ SERVICE MODE

Press the volume DN button to make Volume to [0] level.
Simultaneously Press "Quality" button on the remote control & "Mute" button on the TV.
The letter "S" will appear on the TV screen indicating that the set is in Service Mode.
Use Ch Up | Ch Dn & Vol Up | Vol Dn to select and item to adjust, and change the data value to selected item accoridingly.
To save and Exit Service Mode, press "Standby" button on the remote control.

ARISTONA_GR 2.4 63TA 71111 _SERVICE MODE ENTRY

Turn ON the TV.
Press and Hod the "Menu" button on the remote control & press the "Menu" button on the front panel of the TV>
Press colored buttons to select an item to adjust.
Press 'Volume Up | Volume Dn buttons to adjust the data value to selected item.
Press "Menu" button again to Exit service mode.

Tuesday 25 September 2012

HUNDAI HY-DVD-580 _ UNLOCK_MULTIREGION

Open the "Disc Tray".
Enter [2,4,0,5,9,1,5].
Press "Enter" several times to set the Region = 9.
Close the disc tray.
Unplug the device from mains socket.
Re-plug it after. Now the set is region free.

Friday 21 September 2012

SHARP LC-32P55E _ PROTECTION MODE UNLOCK _ Service Help

Fault: Standby LED appears as the set is switched ON, but disappears, and shuts down.

Check the resistor [R751] of open. If it is found opened, check and replace [R751 & IC704].

TO CLEAR THE PROTECTION ERROR STORED IN MEMORY

Press & Hold the 'Channel Down' & 'Volume Up' buttons on the TV panel simultaneously. The protection error will be cleared.

Wednesday 19 September 2012

HOW TO CLEAN A REMOTE CONTROL

Remote control handsets of most of the electronic devices will get damaged after some time. Some of them can be set right by cleaning the remote control. Remote handsets of some devices will be not available to get from the open market or even from the service centers of the producers. In such cases, cleaning them may get it to work.

Normally, all infrared type remote controls are made up of silicon rubber touch pads. Each touch button in it will have a small carbon button inside it, which comes in contact with the carbon track on the internal circuit board. These carbon tracks are connected to various pins of an IC [Integrated Circuit] on the remote's circuit board. For each button touch, generates signals of different frequency, which in turn activates the infrared LED [Light Emitting Diode], which emits infrared light waves of the same frequency. This infrared light waves are received at the device to which controlled [whether it is a TV, DVD, VCR, DVR etc:]. There is an infrared receiver inside the device, usually called "remote sensor", which receives this signals, convert it to corresponding frequency signals, and processed by the main system control IC inside the device and controls it.

Generally, the remote handset can be called a neglected device. The customer will give no extra care to it. The batteries in the remote control will get damaged after one to two years. It will finally get leaked and the electrolyte in the battery will get in contact with the battery contacts at the battery compartment. This electrolyte will react with metal contacts at the battery compartment that in turn supplies the battery voltage to internal circuits of the remote control handset. If these contacts get rusted due to this electrolyte contact, supply line to the remote control will be interrupted and the remote control will be dead, even after replacing it with new batteries. First thing to check with for a dead remote is this battery contacts. If there is rust or dirt accumulated, clean them using anything like a razor blade, very small file [seen with some nail cutters]. If the fault was due to battery contact, this process of cleaning will rectify the problem.

To clean the inner circuits of the remote control, you have to open the remote control. Most of the remote controls' case is 'press fitted' with lower and upper case parts. There may be 4 to 6 of such locks. Some remotes will have screws also. Detach the lower and upper case, by using any sharp tool. A guitar pick will be efficicant to do this work. Just look for the locks at one side, press the lock position inwards and try to lift up or pull out the case part. Do this work with caution and patience. Never try to get it apart quickly. Get the case open without breaking it.

Inside the remote control, you can see a printed circuit board, with carbon tracks, and IC two or three other components, and an infrared LED. Check the soldering terminals of the infrared LED [two soldering] for any loose solder. If loose solder is detected, resolder that points by applying a little more solder.

Cleaning should be done very carefully. Never use strong solvents like petrol. Rectified spirit is most preferable. Medical quality turpentine can also be used. This can be bought from most of the medical shops. Just dip a piece of soft cloth in these solvents, and wipe out the carbon track and inside of the touch pad. If you use petrol for this purpose, the rubber part of the touch pad will get damaged and will turn sticky. After clean up, let it dry under a fan for some time. Reset the unit as it was before. If no other damage to IC or other components is there, the remote control should work properly.

Saturday 1 September 2012

CRT BASED TVS _ FAULT FINDING_ PICTURE COMES ON BUT FADES OFF GRADUALLY _ AFTER SOME TIME, WILL COME BACK, THEN GOES OFF AND THE SEQUENCE CONTINUES

     The main cause to this type of a fault to CRT based TVs, might be of some loose solder terminals. Some components of any color TV, irrespective of its brand and model, will heat up to an extent while it works. repeated heating and cooling may make the solder terminals to these components to get loose contacted, due to difference in the coiafficiant of the leaner expansion of both the solder material and the metal made of the solder terminals of the component. Normally, the fault will be very difficult to detect, as thy might be microscopically small to naked eye. If you examine these terminals by the help of a goog magnifying glass, can see tinty cracks around the solder terminals.

     Suppose that we switch ON the TV for the first time. Actually, these loose solder points are still there, but in cold condition, thy might be in good elelctrical contact, and the set will work properly. But, after some time, the components will heat up, the gap between the solder terminals and solder points may get aparted. The microscopic gap that have been already there befor ewe switch ON the set, will get enough expanded to cuto off the electrical connection, the set will begin to show porblems. When this happens, naturally, we will switch Off the set and call for service,. But, when the service person come to you, and switch On the set, he can't detact any fault with it.

     This is a common porblem caused by loose solder terminlas. As I've explained above, the fault will be very difficult to detect. If the set is either dead, or hav a distorted picture, or with any othr fault, it will be easy to reach the faulty point, becuse, we have visual indications on the screen. But this case id different. The oly thing I did to these faults, is to resolder all the suspected solder terminals by applying a little more freash solder. In most cases I've made it right.

      The most of these type of fault, can be identified by the screen of the TV itself. Switch On the set. Look whether raster is there or not. If raster is there, make sure that the horizontal and vertical secion of the TV isl functioning well, otherwise, there will be no raster. Ask the customer, about the probelem he faces with this set, listen him carefully. By doing this, we can get an idea about the fault to the set.

     Just imagine, the customer complaints that, the set will work fine at switch ON, and after 10 or 15 minutes, its color combination will go out. The customer can say ony this to us, because, he might not know nothing more than this, as he is not a technician. 'Suppose the customer says that, the picture will go out after sometime, and only a red screen with some lines can be seen. But , if switch off the set for some time, and when switch it back On, the picture will be alright, and after some time, the fault said above repeats'. This is the only information that we've got from the customer's side. His complaint might look like this.

See the complaint. Set works fine and after some time the raster will appear like this, with some horizontal retrace lines across it. A clear indication, that the voltage at the 'Red' cathode of the piclture tube is less than normal than the other two; Blue and Green. In this case, if we tune to any station, the audio output will be OK, but will not have any picture except this red screen. The picture and sound was perfect for some time and after 5 or 10 minutes, the picture suddenly goes out, leaving only a red screen like above, still sound is perfect.

From this sympton itself, we can conculde that there is no component failure in the circuit, but some solder defects are.

The first thing to do is. Switch On the set while its back cover opened, and wait till the fault occurs. When the set begin to show this problem, check the voltages at the Blue, Green and Red cathodes of the picture tube base card. Can note that, the voltage at the red cathode will be much less than the other two this time.

This is the fault; because, if the voltage of the red cathode is not almost equal to the two others,the Red Cathode will emit more electrons than the other two cathodes and will cause to a red predominant screen. This is not a picture tube fault. The fault lies on the circuit itself. Check the red output transistor first. Just desolder it out from the circuit. Without this transistor, switch ON the set. There must not be any trace of red color. If so, be sure; the red output section is faulty.

Check the soldered out transistor for collector to emitter leak. Check it well. Replace it with an other one of the same number. Check the resistor that supplies voltage to this transistor. Usually it will be between the the value of 12 to 15 K Ohms 2Watts. Check this resistor for continuity, and be sure that it has the rated resistance value marked on it. If found opened, replace it with an other one of same value. Re-solder all the solder terminals of this board including CRT base socket solder terminals [CRT base board]. Be sure not to make any solder bridge short in between adjacent solder terminals. You've already won in this case. You've repaired your TV. OK? Do you see any other color predominant screen to your TV, Blue, Green? Check for it as I described here for the Red predominant screen. OK?

If you've any more to know, please leave a comment. I'm ready to share my 40 years of service experience in this field to you.