Philips CRT TV set was slow to coming on repaired
A guy brought this TV to my shop. He explained the problem of the TV set. He turned it on but it took about five minutes to come on. From experience, this is a capacitor problem and it should be an easy fix. At least, that is what I thought but it turns out to be a difficult one. Here is the story.
To be honest with you, I do not like Philips TV sets. It does not matter what kind of TV set it is. I just do not like Philips TV sets. They are too complicated to work on. Anyway, the moment I took the cover off, I saw all this dust covering the board. The customer told me that this TV set was put in the storage room for more than a year.
Testing with ESR meter, I had to replace all the capacitor you can see in the photo. Before I did that, I had to blow all the dust away so I can see what parts I am dealing with. Sorry I do not have the photo of the clean board. Anyway, after replacing all these capacitors, the TV started coming on in less than five minutes. This was a step closer to fixing it but not fully repaired yet.
What could be the problem here? I was thinking out loud. From experience, replacing these capacitors should have solved the problem.
Then I realized something, the fly back transformer was humming too loud, and it did not sound right. I took out the hair dryer and heated up the fly back transformer and to my surprise, the TV came on. It stayed on for a long time but the moment I unplug it, the same problem happens again and I have to heated up to get it working. Again, capacitor problem but why this is happening?
The answer to the humming noise on the fly back, I found a transistor C368 just in the fly back area. It was failing under load. I also found 4.7 UF/35 volts in the power supply. It was a small capacitor that I did not see before that was causing this delay in powering up the TV set. Mission accomplished.
This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment. Please give a support by clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.
By the way if you have any good repair article that you want me to publish in this blog please do contact me HERE.
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Mircea
August 29, 2013 at 1:33 am
Congratulation!
Naseem
August 29, 2013 at 12:19 pm
thanks for the repair report sir!
could tell us more what capacitor exactly you replaced and in which areas/circuits they were located. also the same with the transistor.
thanks again
Waleed Rishmawi
August 29, 2013 at 2:42 pm
thanks Mircea.
Waleed Rishmawi
August 30, 2013 at 2:52 pm
hi Naseem. your are welcome. the capacitors were some in the power supply and some in the fly back area. also the transister was in the fly back area.
Naseem
September 1, 2013 at 12:34 pm
Hi Dear Waleed,
thank you very much.
Waleed Rishmawi
September 2, 2013 at 9:58 pm
Naseem. you are welcome
OSCAR
February 8, 2018 at 1:09 am
thanks sir,what was the behaviour of transistor that shows you that it was bad,was the pins shorting or other symptom?
Elijah Frank
February 21, 2022 at 12:16 am
Philips CRT type 29GX 1891/73R,I want the number of Power IC