Saved Another CRT Monitor From Dump-Model LG 500G
Since I have already covered a similar case in another article, link is provided below; I am skipping some images that might be repetitive. Kindly see them here: https://jestineyong.com/servicing-lg-monitor-model-500g/
This CRT monitor belonged to the hospital where I work and was brought with the complaint that it became dead while it was being used and some smoke came out. The Monitor was delivered to my home. I opened and cleaned it thoroughly and quickly located the problems.
One diode in in the secondary power supply and controlling Mosfet was short and two capacitors were bulged. The Output transistor was also short. Saw fungus formation in a few places. The corresponding circuits are also given below.
After I replaced all the defective components and cleaned the board using IPA, it looked like ok and I fit the board back for a power on trial.
The monitor got on and when I used my Signal Feeder, the output was seen very good.
After testing the monitor for several hours, I fixed the back cover for pick up by the hospital. Mission accomplished gladly adding satisfaction to the collection.
This article was prepared for you by Parasuraman Subramanian from India. He is 72 years old and has more than 30 years’ experience in handling antique equipment like Valve Radio, Amps, Reel Tape Recorders and currently studying latest tech-classes conducted by Kerala State Electronics Technicians’ Association. He has done graduation in BBA degree, private diploma in Radio Engineering and retired as MD of a USA company. Presently working as Consultant to Hospital and other institutions.
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You may check on his previous article on Customer Demanded Replacement Of All Caps In Cambridge CD Player CD6!
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Anwar Shiekh
August 26, 2023 at 8:47 am
I am all for keeping old equipment running, except perhaps when it is costly to do so, in this case I am weary of the cost of electricity to run a CRT.
Parasuraman S
August 26, 2023 at 8:58 pm
Yes, agree with you! Many thanks for your comments!
Andrew F. Ali
August 26, 2023 at 9:47 am
OOPS!!! I vlicked 'dislike' in error.
Admin please remove it for me please.
Jestine Yong
August 26, 2023 at 9:53 am
Hi Andrew,
Sorry, it can't be removed as I can't control the software. It's okay coz Parasuraman can see your sincerity in posting this comment.
Jestine
Parasuraman S
August 26, 2023 at 9:01 pm
Ha! Ha! A dislike is also one that should be liked! It gives us the opportunity to retrospect and rectify our mistakes and wrongs! Moreover, it also ensures reading and scrutiny!
Parasuraman S
August 26, 2023 at 9:01 pm
Yes, dear!
Kelvin
August 26, 2023 at 11:44 am
Yes sir, mission accomplished in did.
Parasuraman S
August 26, 2023 at 9:02 pm
Many thanks for your comments!
Yogesh Panchal
August 27, 2023 at 11:59 pm
Good refreshing time to repair old technology equipment's,
I was planning to buy a pattern generator majorly used for calibrating CRT YOKE but till the time CRT monitors & TVs were obsolete.
Parasuraman S
August 28, 2023 at 3:38 pm
Many thanks for your comments and encouragement!
H S Mann
August 30, 2023 at 4:51 pm
Why two output transistors J6810 and TT2206
Parasuraman S
August 30, 2023 at 10:56 pm
Had to replace twice!