60 Watt Bulb Were Used In Fault Finding
Opened the TV for visual inspection and found fuse blown off
So first of all I have connected 60W bulb across the fuse terminal for fault finding.
The bulb lighten in its full intensity indicates shorting in the circuit.
So started troubleshooting
So I have turned off the unit and decided to start troubleshooting by cold testing method i.e. without powering unit and by testing surrounding components one by one. First I have removed the main filter capacitor and tested found OK.
First culprit I have found is main switching Transistor C5386 meter showing transistor Base collector full short on diode test range.
Tested another surrounding components and Driver transistor also (most of time switching driver transistor also get Damage with main switching tr.) were found ok so further I have decided to replace the main transistor and check.
I have replaced the main transistor and turned on the TV this time Bulb lightened and immediately turned dim that is indication of now there is no shorting in power supply section hence I have applied video signal to AV port and now TV is back to the life.
This article was prepared for you by Yogesh Panchal who works as a Computer Hardware Engineer in Mumbai India.
P.S- Do you know of any your friends who would benefit from this content that you are reading now? If so, forward this website to your friends or you can invite your friends to subscribe to my newsletter for free in this Link.
Note: You can check his previous repair articles in the link below:
https://www.electronicsrepairfaq.com/ptc-secrets
About admin
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
28 comments on “60 Watt Bulb Were Used In Fault Finding”
Leave a Reply
Leave a Reply
This site uses Akismet to reduce spam. Learn how your comment data is processed.
Hi thanks for this article. If my main AC supply is 240 V cani use a 60 watt bulb or should i use a 100V bulb?
Yes. Use a 240/250V rated Bulb. The draw of current is what matters here and not voltage,though it indeed is significant.
if i’m repairing a power supply with 240Vac input at 5A, how many watt bulb should i use?
Yes You can use 60w bulb in series
You should use a 220Vac 60W or 240Vac 60W household light bulb. A 120Vac household or the 100V bulb will blow out immediately.
hello sir I have a problem with my tv, the name of CRT tv is sansui, it is not turn on even if the fuse is ok , please help
I’ve properlly understood the method of using a bulb, thanks alot
Good job, Yogesh.
Very informative for new comers. Thanks for sharing!
Nice work, Yogesh
Thank for sharing this,articles
Good and well done.
Nice sir.good job
Good Job.
Mr.Yogesh.
Hello Yogesh Panchal AND ALL
thanks for the share, i use 220V 100W.
Nice article Yogesh,i used to blow a lot of fuses before i could get the smps fixed,now the bulb idea is a lifesaver..thanks again
Good repair. Thanks for sharing it.
Helpful information for us beginners keep up the good work and keep posting
Master Electronic Repairs/Sales
Thanks, Good troubleshooting Technology
Helpful information. How can a Samsung 14″CRT of computer monitor be used as TV picture tube.
Nice one, you people are really boosting technician’s, please keep up the good work
Henry
Thanks for the article you’d shared it helped me so much for getting idea or technique to learn for a newbie like mw. God bless!!!
Can I use d2499transistor instead of d2498 please answer …
The tv is on but the picture takes more time to be clear just 3-5 minute. Now the tv doesn’t turn on totally. What will be the problem sir?
Panasonic crt tv no power and I checked all parts it’s seems okay please help to solve this problem
gud job sir,thanks a lot,,
Crt tv Nikura 29 inch horizontal section details 110 drop
Hello sir, I have a problem with crt tv repairing it when I connect the deflection horizontal wires it cuts power and a clicking sound is heard but when disconnected power is OK, please help, thanks
Good job