Philips 14PT2665/00 CRT TV Repair
I wanted to connect an extension cable to mains supply to charge my phone. When I reconnect the TV plug, the screen did not turn on and the red standby light started flashing with a slight click. I unplugged the TV to check the motherboard. Indeed I was afraid this short circuit had damaged sensitive components such as transformer high voltage THV … Fortunately there were no black traces of burn, but a capacitor behind the THV seems to be bit inflated. When I measured its capacity, the DMM displayed 4.28nF while the nominal value is 47uF.
I decide to replace it with a new 250V 10uF capacitor, guessing the gap between capacities will have no effect on the video performance and the capacitor will be able to fulfill its duty since its operating voltage is better. But this was no longer the case; the result was a restless and fuzzy picture.
As usual, I had to resort to my gadgets in search of the “savior” capacitor. I got my hands on the power supply of an old digital receiver from which I removed the required capacitor
The 10uF 250Vcapacitor after being soldered did not properly troubleshoot
It has the same capacity as the other damaged and its great threshold voltage of 450V offers a wide margin of surge protection.
The defect is the shorter unsuitable legs:
I had to solder some bits of wire to lengthen them.
In attempt to recognize its function it is hard to track the paths between components surrounding the soldered capacitor, a look to its position behind the THV let say it should be part of the circuit responsible of screen illumination and picture display…
the two capacitor pins beside transformer high voltage ten pins
I manage to repair my Philips CRT TV, its video quality and its powerful sound are effectively worth it.
… Thanks to the electronic treasures hidden in my gadgets to help me successfully achieve such troubleshooting.
This article was prepared for you by Abdellah Kamli from Morocco. He is an electronic hobbyist and followed a training of higher technician patent at Educatel and he repair electrical and electronic devices.
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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
12 comments on “Philips 14PT2665/00 CRT TV Repair”
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Good job, Abdellah.
The 10uF capacitor was just about one fifth of the required 47uF that did the job in the end. And you explained the fuzzy and restless picture very well as a result of the lesser 10uF capacity you first used. Luckily the extension cable to mains supply you plugged back into your at that moment not turning on tv was just a bad coincidence. Most likely the tv’s 47uF capacitor was already bad before.
Hello Albert, I am delighted to read your technical comment on my article, it gives me more confidence and strengthens my attachment to electronics and my desire to learn more about this vast and vital area. Your sixth sense did not betray you by guessing that the 47uF capacitor was already damaged before,(Philips is a Dutch brand if I’m not wrong),I remember a little while before the breakdown I noticed the mediocre aspect of the capacitor and thought to replace it…Your article on crystals is significant fromwhich I try to collect some ideas to apply on my sound system I coincidentally developed from the metronome circuit to which I added a photo coupler and a parallel capacitor with an inductor to form a resonator,the system generates various melodies such as bird songs and other sounds according to transistors types , resonator frequency and metronome oscillation.
You are exactly right Abdellah, Philips is a Dutch brand that started from lightcity Eindhoven long ago. I used to work there for more than 7 years until the end of 2002 in the Medical division of Philips in a town called Best near Eindhoven. Best colleagues I ever had, like a few other jobs before that, but very long days including traffic time. Days from 06:00 to about 17:30 and often longer when many traffic Jams made them even longer! (Mainly because Eindhoven has no underground Metro, unlike The Hague, Rotterdam or Amsterdam).
The metronome audio circuit you are working on sounds very interesting. I’m glad to hear my article on those tiny crystals may be of significant help to you in finishing your project! As you probably know, most great inventions resulted from accidental coincidences, like super glue, the microwave oven, Teflon, and the Pacemaker. Maybe your circuit is next in line, and we read about it in your next article?
hi Abdullah
I read your first article and I’m glad that I’ve read your second one also.
Your explanations and illustrations are clear and to the point.
Hope you’ll continue in contributing to Jestin’s blog.
Thank you Ghashaan for your encouraging comment, it stimulates my thoughts and invites me to contribute again on the wonderful Jestin’s blog.
Greetings
Abdellah Kamli,
welcome! to Jestin Sir’s Blog….
Congratulations! for your First article on this blog,awesome place to share Knowledge & experience in electronics field.
always good idea to salvage some kits and parts.
Keep up sharing the articles.
Well done! Please keep up the good spirits!
Thanks
Too helpful Mr. Yong
Selaam abdelah thanks 👍 dear friend i am Also from Nederland where Philips has born from a little city named Zaltbommel!
im new in electronics,iv learn a lot in very short space of time.i wish i can manage to be inpossesion of every information from books and also the useful equipment for tv’s and radios or audios.thankyou
Desmond from south africa