Cracked Unknown PFC IC Resulted In Replacement Of PS Board In SAMSUNG LED TV MODEL UA32EH4800R
This TV was brought by a close family friend with the complaint that restarting sound was heard but there was no display. As you can see from the second picture above, the back cover screw holes were the haven for potter wasps and there were many like these. I had tough time in cleaning the mud and accessing the screw heads to remove the back cover.
I used blower and small bottle brush and after repeated attempts I could clear it off. It was time consuming and tedious. After cleaning the inside and the rear cover, I brought the TV onto my work table to investigate what went wrong in the power supply. I removed the board and subjected it to a visual inspection. I found that one eight pin PFC IC had cracked and there was no way of knowing its number.
With the available details like what comes to the pins I sent an SOS to my techie friends in three groups and requested for help. But inspite of vigorous follow-ups, none could help me as this type of PFC board of a 32” LED TV was very, very rare.
I informed the customer and waited for a couple of days and then one of the techie friends who deals with old boards offered me a compatible replacement board without the PFC. Well, I never had any other option except to pay and place order for that. That board reached my hands the next day and I checked and compared the pin connections and fit it and gave power. I was glad to see that the TV started working well again. I allowed it to run for a few hours before fitting the back cover and informing the customer to arrange pick up.
I put tapes on all screw holes to save my time; if at all the TV comes again for service. I gave the old board to the customer and advised him to preserve it carefully for any future use of components that could be salvaged. Mission accomplished with satisfaction finding its friends in the bag!
This article was prepared for you by Parasuraman Subramanian from India. He is 74 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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Yogesh Panchal
September 20, 2025 at 2:19 pm
Good Job! Sir,
Getting spare parts is the most challenging task for technicians these days.
Parasuraman S
September 20, 2025 at 7:22 pm
Yes, that too genuine ones! Many thanks, Yogesh Bhai!
Yogesh Panchal
September 20, 2025 at 2:25 pm
Si
Do you have IC Number you replaced.
Parasuraman S
September 20, 2025 at 7:27 pm
No dear, the IC number could not be traced as the replaced board was different without PFC.
Waleed Rishmawi
September 20, 2025 at 2:58 pm
a job well done my friend. sometime being smart is better than working hard. if the board not fixable we use other options and it work and in the long run it is good for us a technicians and for the customer..have a blessed day and thanks for sharing
Parasuraman S
September 20, 2025 at 7:28 pm
Many thanks for your involved comments, dear friend!
trebel
September 20, 2025 at 4:20 pm
Thank you for all your hard work.
Thank you kindly.
Good tutorial.
Cheers m8.
Parasuraman S
September 20, 2025 at 7:29 pm
Many thanks!
Mark
September 20, 2025 at 8:18 pm
I find it frustrating when the component is so damaged that you can't order the correct one to replace it.
I find it twice as frustrating when the manufacturer has purposely ground of the part number to stop any back-engineering or repairing.
Parasuraman S
September 21, 2025 at 12:05 am
Yes, both are very frustrating indeed, dear Mark! But, what to do, we have to face them! Many thanks!
Albert van Bemmelen
September 20, 2025 at 9:13 pm
Odd that this board couldn't be bought online because I found several offers while searching for about 40 dollar/euro. Used of course but obviously tested before presenting. It is good to know that another compatible replacement board without the PFC was available. But I have no idea what that meant?
Parasuraman S
September 21, 2025 at 12:10 am
Boards come with Power Factor Control and without that too. PFC is used in high end models as a statutory requirement to follow regulations of the Electricity Board. This model was also using a PS with PFC, which also depends upon the power consumption. The replacement board was not available and I had no other go but to do this. Many thanks, dear Albert for your expert comments and inputs! I prefer to buy from known techie friends instead of online as I get guarantee from my friends.
Jim Whalen
September 22, 2025 at 6:30 am
Hmmm well did you get to see what the pfc chip number is on replacement boards for sale? Asking for a friend lol
Parasuraman S
September 22, 2025 at 3:06 pm
As mentioned by me earlier, the replacement board did not have PFC in it and there was no chance of knowing the number. Many thanks!
Muykit
September 21, 2025 at 6:32 am
The IC to me bears a close resemblence to viper 22A, I know other than its internal electronic setup, appearance doesnt matter though I cant stop imagining that its certainly a PWM IC, concidering that it lies squarely in the SMPS territory and its beyond me to visualize what else it may well be intended for. And whats more, A22s are fond of bursting in protest as they quit duty, evidence lies in some DVD sets. Now,I'm pondering over this, wouldnt fitting a power module have more or less just worked ?
Parasuraman S
September 21, 2025 at 5:12 pm
Power module would not work properly in a PFC circuit! (Power factor correction) Many thanks for your comments!
Mark J
September 21, 2025 at 7:49 am
Parasuraman great job on the repair.
Parasuraman S
September 21, 2025 at 5:12 pm
Many thanks!