Blue Screen In TV Repaired
This Syber CRT TV 21″ came in with the complaint of no tuning and no channel. Later the display became blue screen- see the photo below:
I took out the cover and head straight to the tuner section to see if there is any dry joints or not. There were no dry joints found so I deceided to check on the Tuner important voltages with power On.
The first point I checked was the AGC voltage and it was found to be good (4.2 volt).
Next I checked on the VT voltage and it was found to be good too (33 volt)-see the photo below:
The other tuner pins all the voltages were found to be good.
From experience, if all the voltages in the Tuner pins are good then the biggest suspect is the tuner itself.
I kept a used tuner in my compartment and took it out and fixed into the TV and powered On.
Guess what? All the channels came back. I was delighted because I can charge my customer.
Conclusion- For your information, it is not easy to repair tuner circuitry because of lack of schematic and the parts are very small. The time spent on repairing tuner just not worth it. Get a used or new tuner so that the extra time you can use it to repair some other equipment. Ok will see you again in the next article.
This article was prepared for you by Suranga Bandara who owns an Electronics repair shop in Anuradapura, Sri Lanka.
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Jestine Yong works as an Electronics Repair Lecturer in Kuala Lumpur Malaysia and his training website is http://www.NoahtechElectronicsTraining.com. You can check out his repair blog at http://www.JestineYong.com
16 comments on “Blue Screen In TV Repaired”
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Well done! As usual, a free walk for, because of your expertise!
Sound advice and quick repair!
I like the fact that you mentioned not repairing items that are just not worth the money you can get for fixing, way too many techs will waste time on low-profit repairs for little or no money.
My Decision was that, repairs are necessary in large quantities. A single item is time waster. But as if that’s not enough, clients mix their acquittance with problem solutions. Is it true that in Japan, no repair shops exist?
I am grateful to learn repairs of different television sets and I have one issue of television set of not showing anything on the screen but it is giving sound.What are possible faults and the solutions to such issue.?
thanks for sharing this wonderful and helpful infor as usual. it is very time saving!
Good job, Suranga. Whether or not a device is worth repairing depends on what the customer is willing to pay for the repair. Sometimes sentimental value may be a contributing factor in their decision.
Good job
Well elaborated article regarding RF tuner.keep on educating us on maters electronics.Thanks
I’m really surprised to hear that you still have analog TV channels in your area. I stay in Uganda, but it’s now 4 years since the transition from analog to digital took place. That article greatly reminds me of such days of tuner failures. Thanks a lot bro!
Good job! Suranga
My lg ultra sim tv when switched on!
Only red led lights up but not worki g on screen at all! Please help Jes
Tuner can be repaired,they are also prone to crack board, loose connection/ cold solder,dirty pcb. I made these tuner back to life by simply cleaning and resoldering them with the use of small tip soldering iron,thin solder and magnifying glass..specially on Jvc,Sharp,Panasonic and Sony tuners.
Thanks a lot for sharing this tutorials us. A customer brought similar problem to me. The TV is working quite alright but all of a sudden there would be a horizontal line at the middle dividing the TV into two, the upper will show while nothing showing below, and until it’s being hit by the side of the TV before getting back to normal. I have not opened it but I just need a clue towards the solution.
Thanks
I have a problem with CRT TV telefunken when connect to a receiver it switches on and off but when I disconnect it from a receiver it turns on with no problem. What is a problem with it?
Hi a have a panasonic tv it turns on with sound but there is no picture it only shows the line in the middle on the side I like to know what is the problem…