Mits VS-6071 Repairman removed a part and left never came back
My tv picture went out, still had sound. repairman removed a circuit board, left, never came back. the board is approximately 4 1/2 inches by 3 inches, has a silver protective cover over part of the board. imprinted on the silver cover is; VR7001, VR7002, LC7101, LC7102, on the reverse of the board, on a metal protective cover is the following TR-RC, TR-WC, GND, GND. could someone explain what this is and it's function, then remedies? thanks in advance. i tried to turn on the tv, it sounds like this, click-click, that's it.
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The main power supply regulator section circuit fault. Either it will be a separate board, or the part of main board. Check and replace damaged component/s at its main power regulator [SMPS] section circuit. Check the Va and Vs voltages. These voltages should be so accurate as marked on the silk screen behind the display panel. Contact any service technician. If you wish to get some details; check the site linked here. Pull up older posts. http://electronicshelponline.blogspot.com/
It will be best to replace the power supply regulator board as card basis rather than making "Surgery" to it; which usually will make loss for both money and time. Even though you can make it right, it will cost around an amount equal to the cost of a new board; including the cost of (spare parts + service charge) More to say, most of the spare parts to it will be difficult to get from open electronic spare part market. This is true to most of the flat panel TV power supply boards; irrespective of its brand and screen size.
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.
YOU HAVE A INTERNAL TV PROBLEM ON A ELECTRICAL CIRCUIT BOARD. SOUND WILL COME THRU BUT NO PICTURE. IT WILL NEED TO BE SERVICED BY A TV REPAIRMAN. ON CERTAIN TVS IT MAY BE AS SIMPLE AS A CONNECTION CABLE FROM THE CIRCUIT BOARD TO THE TV SCREEN, BUT IT IS STILL A TV SERVICE REPAIR FIX. - SORRY
If this Tv is a model year 1996 or 1998, It is quite possible your vertical IC needs resoldered. It is located on the small signal board. This board [quite large anyway] is the board on the left. I don't know the location off hand. The IC has seven pins and located on a heatsink, It is a TDA series. Resolder any and all grounds you see. May as well get the Large Signal board [On the right] resoldered. The other problem would be the P I P board, a small board standing up, that can be removed and replaced. But try the earlier first. This is tedious, but will produce results.
YOU HAVE THE DREEDED CAPACITORS GOING OUT...AFTER A FEW YEARS-THE CAPS LOOSE THERE PURPOSE AND DEPENDING ON WHAT CIRCUIT THERE IN --YOU WILL SEE THE ASSOCIATED PROBLEM,,,EXAMPLE--COULD BE SOUND ,PICTURE (YOURS) OR VERTICAL(PICTURE CLOSING UP) ETC... YOU CAN HAVE CHECKED BY A REPAIRMAN BUUUUT ,MAY NOT BE COST EFFECTIVE ,,TUNICA
That sounds like a bad vertical circuit. Do you know how to use a meter and solder? If so we can troubleshoot otherwise you will need to call a repairman. A good repairman should run you $300-$500 to repair this. Let me know what you would like to do!
Let me preface what I'm about to suggest with my own comments. I've been a TV Technician for more than 20 years. That said, you don't fix it without calling repairman or you wouldn't have posted here.
In this unit there are common lytic caps that should be replaced without question. By location number and value they are:
Next it might be a good idea to ESR test other caps in the B+ line. ESR stands for (equivalent series resistance) It's a way of measuring the cap's effectiveness in a circuit. There are testers on the market for just under $200.00 for the backyard technician and they are a must.
Check the set for ring cracked solder joints. The symptom of leaving it off for awhile and then being able to get a picture suggests that it could be ring cracked in one or more areas, usually areas of high heat.
When all else fails there is calling the repairman. If you don't know how to find a reputable shop in your area I might suggest contacting NESDA (National Electronic Service Dealers Assn.) who can give you some reputable shop contacts in your area.