Bad SMD Capacitor Caused No Display In HAIER LED TV MODEL LE32B9000
This TV was brought by a carpenter who had come home to do some work and happened to see me involved in Electronic service work. In fact, there are quite a few customers who are like him. This is in fact an added advantage whenever we engage someone for work in the house. The complaint was that picture went off suddenly when watching and sound was only heard. My immediate doubt was about backlight, which is quite common.
Anyhow, after opening and cleaning the inside thoroughly, I checked the LED strip using my LED Tester and found it to be working well. The output voltage from the driver of the board was also ok. So, next I probed the voltages on the scaler board and found these missing. In such circumstances, I followed the advice given by my techie friends, by doing a cold test of all the capacitors on the scaler board. By the way, recently I acquired one Microscope and bought an adjustable stand (in fact it was a Mike stand bought from Amazon) as guided by my techie friends.
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This came very handy in viewing the boards, which housed very tiny components, which are very difficult for the naked eye. Using a lens occupies one hand and we won’t be free. Even the table top lens with light does not serve the purpose fully.
As it was dead short, there was no way of knowing its correct value. So, as advised by my techie friends, I looked for a similar capacitor from an old scaler board (which was sent by a second hand dealer) and found it to be reading as 22uF.
Since the defective capacitor was in the DC supply for the level shifter IC, it is very important for replacing it. Then replaced the defective capacitor and powered the TV to see the display back.
Mission accomplished very satisfactorily, though devoid of any exciting challenges, and got added to its bag!
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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12 Comments
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Yogesh Panchal
May 7, 2021 at 3:29 pm
Sir,
Good JOB! and congratulations! for New microscope just want to know how is clarity of microscope?? can you provide us link for both the the material.
Parasuraman S
May 7, 2021 at 10:17 pm
I bought the camera from Ozone Electronics,Kanjangad, a technician member of our whatsup group. Mike stand was bought from Amazon. You yourself can search for it very easily. Many thanks for your comments!
Albert van Bemmelen
May 7, 2021 at 4:19 pm
Using such a mike stand on these microscopes is quite a handy feature. But I just use the stand that came with the microscope I bought on Aliexpress. But I experienced a lot of failures with the firmware in my scope when using it to make snapshots from components. It keeps freezing when it should take snapshots or at other moments when it isn't to suppose to quit. The reset button inside needs to be pressed quite often to de-block the bad functioning microscope. My badly firmware made scope needs much better firmware but sadly there isn't any better version update and the seller only sells these with very poor bugged firmware made scopes!
Parasuraman S
May 7, 2021 at 10:17 pm
Many thanks for your comments!
Waleed Rishmawi
May 7, 2021 at 5:54 pm
Microscopes are very important in our field of work. I bought mine from Amscope about four years ago and recently I ordered a HDMI camera that sits on top of the lens that can be connected to a big screen. that way I do not have to strain my eyes all the time. it is worth it although very expensive but helped me in many ways especially I deal with iphone board repair and it comes very handy. good job in the repair and thanks for sharing. have a blessed day
Parasuraman S
May 7, 2021 at 10:18 pm
Many thanks for your comments!
Parasuraman S
May 7, 2021 at 10:17 pm
Many thanks for your comments!
Anwar Y Shiekh
May 8, 2021 at 2:20 am
Concerning microscopes for electronics work, would a stereoscopic one be best?
Parasuraman S
May 8, 2021 at 9:08 am
Well, no idea!
John C
May 8, 2021 at 2:28 am
Albert, I was having similar problems using my Supereyes microscope until I switched it from a USB 3.0 port to a USB 2.0 port
Parasuraman S
May 8, 2021 at 9:09 am
That is a good input! Many thanks!
Lawrence Pina
May 16, 2022 at 9:22 pm
When I run into problems like this, the short is generally present on multiple components, scattered across the board and often, there is no burn mark to indicate which is actually shorted. How did you narrow it down to that one capacitor without having to remove every component affected? Thanks. Very much appreciate your posts. I've learned a lot from you!