Question about Sharp Aquos LC-37G4U 37 in. HD-Ready LCD Television

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LC37GA8 RESET After replacing the backlight generator board which was faulty [open cicuit transformer] the set now switches into standby I suspect there is a reset that is required to eraise the original fault condition do you know what it is Also someone contacted me from your organisation and is suposed to be sending me schematics for the above reciever and also a sonny that i have in for repair

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You must unplug the unit, and while unplugged depress the volume up and channel down buttons at the same time (the buttons on the tv) and while buttons are depressed, plug the power cord in. Hold the buttons for 1 sec. then release. The unit should no be on in the service mode. A small k should appear on the screen. With the remote press the channel up button. There should now be a menu on the screen where you can see lamp error line. The lamp errors will most likely read 5 and 5 lamp errors in this unit will cause shut down. Use the channel down button on the remote until you highlight that line. Withe the curser right arrow button select the 5 and now with the channe up button you should be able to reset the 5 to a 0. Now unplug the unit and wait 30 sec. before powering the unit. That should return the unit to normal operation.

Posted on Feb 07, 2008


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I have a Bravia-Kdl40W580B led tv . I have backlight but no picture. I replaced all three boards. I did a firmware update . I have backlight and the LED light is blinking slowly and its blue

These blinks [flashes] are fault indication (Error Codes). From the number of blinks occur at one time switch ON, you can get an idea about the faulty circuit section inside it. This will make repair easy. These are called blinking codes. Make sure about the exact number of blinking of the standby/power LED, by switching On & OFF the set, for at least two times. Count it carefully. If you wish to get some details, check the site linked here. It has details about blinking codes, and fault locating procedure, to many popular brand TVs and other devices.
If blinks continue without any pause, the main board is faulty.
Search the site by type in the "brand name" to your device, in the "Search box at the top right of the display window of the Homepage" to get gathered related posts.

Jul 15, 2016 | Televison & Video

4 Answers

Standby light

Ok sounds like you need a technician to look at it due to a transformer failure. Keep me posted

Jun 16, 2008 | Sony FD Trinitron WEGA KV-36HS510 36" TV


Troubleshooting Guide

  • Problem: Totally dead oven.
    Possible causes:
    1. No power to outlet (blown fuse or tripped breaker or GFCI).
    2. Blown main fuse - likely due to other problems.
    3. Open thermal protector or thermal fuse.
    4. Defective controller or its power supply.
    5. Clock needs to be set before other functions will operate (some models).

  • Problem: Totally dead oven after repair.
    Possible causes:
    1. Cabinet screws replaced in incorrect location (safety interlock not engaged).
    2. Any number of screwups. :)

  • Problem: No response to any buttons on touchpad.
    Possible causes:
    1. Door is not closed (some models).
    2. You waited to long (open and close door to wake it up).
    3. Controller is confused (pull plug for a minute or two to reset).
    4. Defective interlock switches.
    5. Faulty controller or its power supply.
    6. Touchpad or controller board contaminated by overenthusiastic cleaning.
    7. Defective/damaged touchpad.

  • Problem: Oven runs when door is still open.
    Possible causes:
    1. Damaged interlock assembly.
    2. Cooling fans (only) running due to bad sensor or still warm.

  • Problem: Oven starts on its own as soon as door is closed.
    Possible causes:
    1. Defective triac or relay.
    2. Controller is confused (pull plug for a minute or two to reset).
    3. Defective controller or its power supply.
    4. Touchpad or controller board contaminated by overenthusiastic cleaning.
    5. Defective/damaged touchpad.

  • Problem: Oven works but display is blank.
    Possible causes:
    1. Defective controller or its power supply.
    2. Broken display panel.
    3. Oven needs to be reset (pull plug for a minute or two to reset).

  • Problem: Whacked out controller or incorrect operation.
    Possible causes:
    1. Previous or multipart cook cycle not complete.
    2. Controller is confused (pull plug for a minute or two to reset).
    3. Defective controller or its power supply.
    4. Touchpad or controller board contaminated by overenthusiastic cleaning.
    5. Defective/damaged touchpad.
    6. Defective sensor (particulalry covection/mirowave combos).

  • Problem: Erratic behavior.
    Possible causes:
    1. Previous or multipart cook cycle not complete.
    2. Bad connections in controller or microwave generator.
    3. Faulty relay - primary (or HV side, much less commonly used).
    4. Defective controller or its power supply.
    5. Bad contacts/connections on mechanical timers. Intermittent fuse.
    6. Power surge at start of cook cycle confusing controller.
    7. Microwave (RF) leakage into electronics bay.

  • Problem: Some keys on the touchpad do not function or perform the wrong action.
    Possible causes:
    1. Touchpad or controller board contaminated by overenthusiastic cleaning.
    2. Defective/damaged touchpad.
    3. Controller is confused (pull plug for a minute or two to reset).
    4. Faulty controller.

  • Problem: Microwave oven does not respond to START button.
    Possible causes:
    1. Defective START button.
    2. Faulty interlock switches.
    3. Door is not securely closed.
    4. Faulty controller.
    5. You waited too long - open and close door to wake it up!

  • Problem: No heat but otherwise normal operation.
    Possible causes:
    1. Blown fuse in HV transformer primary circuit or HV fuse (if used).
    2. Bad connections (particularly to magnetron filament).
    3. Open thermal protector or thermal fuse.
    4. Open HV capacitor, HV diode, HV transformer, or magnetron filament.
    5. Shorted HV diode, HV capacitor (will blow a fuse), or magnetron.
    6. Defective HV relay (not commonly used).

  • Problem: Timer and light work but no heat, cooling fan, or turntable rotation.
    Possible causes:
    1. Defective (lower) door interlock switch or door not closing fully.
    2. Faulty relay or triac.

  • Problem: Fuse blows when closing or opening door:
    Possible causes:
    1. Defective door interlock switch(s).
    2. Interlock switch knocked out of position.
    3. Misaligned door.

  • Problem: Loud hum and/or burning smell when attempting to cook.
    Possible causes:
    1. Shorted HV diode, magnetron.
    2. Burnt carbonized food in or above oven chamber.
    3. Shorted winding in HV transformer.
    4. Frayed insulation on HV wiring.

  • Problem: Arcing in or above oven chamber.
    Possible causes:
    1. Burnt carbonized food deposits.
    2. Exposed sharp metal edges.

  • Problem: Fuse blows when initiating cook cycle.
    Possible causes:
    1. Defective interlock switches or misaligned door.
    2. Shorted HV capacitor.
    3. Shorted HV diode.
    4. Shorted magnetron (probably won't blow main fuse but HV fuse if used).
    5. Defective triac.
    6. Old age or power surges.
    7. Defective HV transformer.
    8. Short in wiring due to vibration or poor manufacturing.

  • Problem: Fuse blows when microwave shuts off (during or at end of cook cycle).
    Possible causes:
    1. Defective triac (doesn't turn off properly).
    2. Defective relay.
    3. Shorting wires.

  • Problem: Oven heats on high setting regardless of power setting.
    Possible causes:
    1. Faulty primary relay or triac or HV relay (not commonly used).
    2. Faulty controller.

  • Problem: Oven immediately starts to cook when door is closed.
    Possible causes:
    1. Shorted relay or triac.
    2. Faulty controller.

  • Problem: Oven heats but power seems low or erratic.
    Possible causes:
    1. Low line voltage.
    2. Magnetron with low emission.
    3. Faulty controller or set for wrong mode.
    4. Stirrer (or turntable) not working.
    5. Intermittent connections to magnetron filament or elsewhere.
    6. Faulty primary relay or triac or HV relay (not commonly used).

  • Problem: Oven heats but shuts off randomly.
    Possible causes:
    1. Overheating due to blocked air vents or inoperative cooling fan.
    2. Overheating due to bad magnetron.
    3. Bad connections in controller or microwave generator.
    4. Faulty interlock switch or marginal door alignment.
    5. Faulty controller.
    6. Overheating due to extremely high line voltage.
    7. Stuck stirrer fan resulting hot spots detected by sensors.

  • Problem: Oven makes (possibly erratic) buzzing noise when heating.
    Possible causes:
    1. Fan blades hitting support or shroud.
    2. Vibrating sheet metal.
    3. Vibrating transformer laminations.
    4. Turntable or stirrer hitting some debris.

  • Problem: Oven light does not work.
    Possible causes:
    1. Burnt out bulb :-).
    2. Bad connections.

  • Problem: Fans or turntables that do not work.
    Possible causes:
    1. Gummed up lubrication or bad motor bearing(s).
    2. Loose or broken belt.
    3. Bad motor.
    4. Bad thermostat.
    5. Bad connections.

on Mar 30, 2008 | Kenmore 80412 Microwave Oven

2 Answers

I have a bush tv its got sound but no picture

Check and replace damaged component/s at its horizontal scan output section circuit. Check the LOT (Line Output Transformer) too for damage. Replace the horizontal scan output transistor. Check the input voltage to LOT. If the voltage is absent check the feeder resistor; if any. If you wish to get some details; check the site linked here. Surf the site with patience. Pull up older posts.

Apr 08, 2015 | Bush Televison & Video

1 Answer

Why my LCD TV blinks picture and goes off when backlight is high

When you set the backlights to high it causes the inverter board to generate more energy, as well as consume more from the power supply, all the while both are generating more heat. If you have your set mounted (restricting the vents) and/or you regularly use the high setting, that could cause capacitors to bulge and leak due to excessive heat damage. I would open her up and have a look at the power supply and inverter boards. Check for bad caps or board surface discolorations.

May 26, 2014 | Sharp Aquos LC-37GD6U 37 in. LCD HDTV

1 Answer

The video on our Insignia 32" LED-LCD HDTV, 1080p

Hi Joyce,

First of all thank you for posting your question here at Fixya.
I've suspected that the fault is not the cable reception, hook up, but inside the set. To confirm it, check if the symptoms remain the same no matter what the input is (DVD/BD player, game console, direct TV, etc.). If the problem still persist, then the fault is either the inverter board or the backlight of the TV.

Backlights are the one generating the brightness backround of LCD to see the images generated at the LCD panel. It has a high voltage source that will light it up and that is the inverter board. If one of the backlights fail, it will produce overload to the high voltage transformer of the inverter board and will sensed by the feedback circuitry and will automatically shuts off the power supply of the inverter board to avoid further damaged. Same when the inverter board gone to malfunction, the feecback circuitry will automatically shut off its power supply.
The backlights and the inverter board must be checked to isolate where the fault came from. Most of the faulty backlight has a physical indication of fault like blacked end, and can be easily identify through visual inspection. If the backlights are in good condition, then the fault is the inverter board. and is a reliable supplier of parts, check your model no. at the rear panel and then search it to their search engine and all available parts will be displays.

Also, I would advice you to double check if your unit is under warranty period (1 year), if so, avail it because the manufacturer will fix it for free. Opening the rear panel will void the warranty.

Please let me know if you need further assistance.
Hope I gave you an idea what's going wrong to your unit.

Have a nice day!
Good luck and take care!
Kind Regards,

Dec 15, 2011 | Insignia Televison & Video

1 Answer

Hi, my tv screen just went off. When i switch it on it shows a picture then becomes black on screen, please advise

Your backlight controller board is faulty and requires repair. It may be due to bad capacitors or a faulty inverter transformer. Capacitors are fairly easy to replace, the inverter transformer is harder to replace and it is often easier to replace the whole controller board. This type of repair should only be carried out by an experienced electronics engineer.

Mar 15, 2011 | Televison & Video

1 Answer

F-20 has sound but no picture, on VGA, or TV cables. Power looks ok. where can i find more info on testing for the problem and fixing. Thanks

Sound but no picture usually implies a faulty backlight. It may be simple case of replacing one or more electrolytic capacitors in the power supply or on the backlight inverter board. It may be that one or more inverter transformers has gone open circuit or short circuit, causing the inverter board to shut down. If this is the case then you can replace the inverter board with a universal inverter board but you will need to figure out the wiring. In most cases there are only three wires required - 12V, 0V and switching wire.

Feb 25, 2011 | Acer Ferrari F-20 20" LCD Monitor

1 Answer

Samsung's LCD monitor SyncMaster 740N; backlight failed, I replaced bulging capacitors on PSU and burnt fuse but backlight is still not coming on

There is a inverter transformer on the board that may be defective that generates the high voltage that drives the lamp, you may end up having to replace the whole inverter board to get it working again.

Jan 26, 2011 | Samsung SyncMaster 740N 17" LCD Monitor

1 Answer

Avr 235 power at standby mode but sometime unable to power up, please help. A lot of thanks.

Open the unit and measure the voltage across the reset microswitch on the transformer board (with the unit in standby). It should be a hi signal, over 3 volts. If it is low, below 1 volt (when you can't turn it on) it is sending a constant reset signal to the cpu. Remove the switch and try again. If the problem goes away, the switch was bad. Its a service switch so you don't have to replace it.

Mar 25, 2010 | Harman Kardon AVR 235 Receiver

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