20 Most Recent LG DU-37LZ30 37 in. LCD HDTV Questions & Answers

If you wish to get some details; visit the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ Circuit diagrams of SMPS section of many popular brand devices are given. Search the site by type in the "brand name" of your device, in the "Search box at the top right of the Homepage" to get gathered related posts. Search the site by type in the "BRAND NAME" of your device; (Exclude the model number), in the "Search box at the top right of the display window of the Homepage" to get gathered related posts

Fault at its main digital board. Short circuited component/s at it. Contact any service technician; or the authorized service center. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/ In most cases, the main board might have to be replaced. If so, a software [firmware] update too might be necessary. Before going further; try a hard reset first. If it does not help you, replace the main digital board. There are two methods to reset TVs. The first is simple to do; a Hard Reset. The other is somewhat skilled; is a Factory Reset (System Reset). To make it a hard reset, just unplug the TV from AC mains wall socket, and re-plug it back after 15 minutes or so. If you do this by overnight is better. This procedure will make it a hard reset. If you want to make it a system reset [Factory Reset]; you have to enter its service mode option, and select the factory reset option. If you wish to get some details; visit the site linked here.

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. http://electronicshelponline.blogspot.com/ http://electro-medical.blogspot.com/ Blinking codes details of many popular brand TVs are given. Surf the site with patience. If blinks continue without any pause, the main board is faulty.

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. http://electro-medical.blogspot.com/

If you wish to get some details; check the site linked here. Pull up older posts. Surf the site with patience. http://electronicshelponline.blogspot.com/

It is a bad symptom. Might be related to its display panel. Contact any service technician to confirm. If you wish to get some details; check the site linked here. Viewing it in "Mosaic" will make surf easy. http://electronicshelponline.blogspot.com/

For LG DU-37LZ30 specifically - On the power supply board, look for IC101, an 8-pin DIP IC. There will be three smaller electrolytic capacitors near it (C107, C113 and C125) marked 47uF, 35V. I'm being lazy here, but replace all three (only one is the real culprit). What is happening is that one of these caps is charged by line voltage until the IC (power supply controller) can start running. When this capacitor gets leaky, it cannot reach the proper voltage to start the controller. I used a 47uF, 50V replacement.
I have fixed two LG sets with this same problem. The other was a 26". It's a cheap fix!

go in touch with LG customer service....they will help u with ur problem

The power board of your TV is known to go bad as you will soon find out if you try to find a replacement. While the described symptom may or may not be caused by the power board the above fact is a serious reason to look there first. In all fairness we haven't worked on this particular power board, but we've worked on many others and you can send it over for evaluation if you wish. See more at www.coppelltvrepair.com/newservice .

What model of tv is it?

Common problems for most LCD and Plasma tvs sets.The tv power supply board it is the causes and problems,that the board where the tv a/c power cord plug into it.Take the tv aparts and check tv power supply board carefully looking for dying an leaking components capacitors parts.These dying and leaking capacitors parts are alway bulges up onto it tops or puffing up onto it tops.U have all the tools and understanding basic electronic also can do basic soldering work too?Yes.All these dying and leaking components capacitors parts are bulges up or puffng up onto it tops u must have to replace them.Replaces all these dying and leaking capacitors components parts with the same Miro Farad but upgraded all those capacitors parts voltages higher voltages like 5 or 10 voltages higher than those old capacitors components parts u are replacing.By replacing all those old dying and leakages capacitors parts voltages higher 5 or 10 voltages higher.The capacitors parts will with stand heat better than those old capacitors parts was in the power supply board earlier.Or tries websites like Shopjimmy.com,Ebay.com to buy a whole refurbish power supply board for the replacement.

llok for Bad Capaciotrs on power supply board they will be vented or swollen on Top. 1000uf 16v 2200uf 10v 3300uf 10v

This is a classic switchmode power supply, has sensed a severe potential problem, and is shutting down to avoid a fire, explosion, or both. This set had developed a problem, that is so severe that the set must be shut down, This set should be removed from the Power, and in my professional recommendation, you should get a "Quote" for repair, from, an, Approved Service Center, this point is very important for a good result, Always contact, their local, "Head Office" Now, when you get the information you want, then you can decide as to repair of replacement. The reason we want an approved agent, is that way, all the engineers are trained on their own brand sets, they have seen almost all faults, and will get the job done quicker, and for less cost, and usually have parts on hand, also sometimes, there has been a service bulletin in issued and the repair may be subsided or even free. There are many, many, many reasons that display this symptom, one must work through the troubleshooting steps to isolate and identify, the Cause and repair that and any damage done

Good day.

Please check the power supply.
This the procedure:

1. Open the cover,remove all screws at the back.
2. Plug in the cord then power on the TV to perform voltage data/voltage check.
3. Check the output voltage of power supply by using a voltmeter.5vdc,for system board 12vdc for sounds and 24vdc for inverter board/back-light.
4. If the supply got voltage drop specially on 5vdc.Unplug your TV then check some leak/bulge on top capacitor and replace it.
5. After you replace the capacitor.Plug-in the cord and power it ON again to test if it is OK.

I hope that procedure will fix your problem.Thank you and good luck.

Hi - that's fairly simple. Using the original remote, enter 7-7-7-7 when asked for the password. It should then be cleared of the unknown password and ready to go.
Enjoy, Mikeywaf