Question about Sharp LC26DV20U 26 in. LCD HDTV/DVD Combo
Only analog channel reception now, HD channels too weak. Same symptoms w/ DVDs (left half blank, rt half OK). All other functions good.
Training manual above,
http://www.eserviceinfo.com/equipment_type/TV_2.html Above and below, are service and repair manuals. Follow troubleshooting steps.
This is a common problem, and is discussed in the training manuals above, please download and use these manuals to troubleshoot your issue, you will no doubt have to replace a board or two, but just work through the troubleshooting steps, starting at the power supply and work out, you should be able to isolate and repair your issue. When servicing try not to let the entire thing overwhelm you as one, treat the set as a conjunction of “Units”. Meaning that we can break the unit up into sections, for instance we have a Power Supply, and Audio section, a Remote Control section, we have a Input Control section, we have a Video Control section, and so on. Now all these connect to specific parts of the circuit. Some have no relationship with each other and some are dependent upon each other. What we need to do is try to understand our “Fault” and isolate it to at least an “Area”. Now when we have isolated the apparent problem, we then need to check our “Input” to that section and also the “Output” of that section, also we must first check that sections supply voltage and current, are correct. Depending on the unit being serviced, the Repair options, may be limited to changing a “Board” to clear the fault. Often these boards are exchangeable, and you get a rebate back, if when you purchase the new board, you send them you old broken board, and they then repair that, and around it goes. Other times, one must go down to “Board level” to effect a repair, always double check, before determining some component is faulty, it is best to isolate/remove, the component to test, often an “in situ” test can give erroneous reading due to “Other” components connected, altering the readings. Always replace with as good if not better components that you are replacing, skimping of component costs is counterproductive, in the long run. It can often be a great troubleshooting method, to completely isolate the “Faulty” part of the circuit, if you can, isolate the in & out, and also remove, the “Native” power from, it too. You power from and external source, then also you can provide an External “Drive” to this circuit which you will NOW, be able to test under a, “know good” situation, which is so important to gain a benchmark for operation. NEVER EVER simply replace a Board or Component without ascertaining WHY, it has failed, as seldom does anything spontaneously fail, unless placed under stress at all operating times, such as a power Supply or the like.
Of course, it is my professional opinion though that everyone should take their units to their manufacturers approved service center, contacting a head office, of your unit & getting an approved service center is just SO important, even worth the extra to ship it, you see, at those places, the Engineers, are trained on the equipment you have, they usually have parts on hand, and do the job quicker. Anyway do that and get a "Quote". This way, at least, you'll know weather to repair or replace.
Posted on Jun 02, 2010
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Posted on Jan 02, 2017
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