## Sửa TV siêu tốc! Chuyên gia dự đoán chuẩn nhưng lý do khác
Bài báo dài:
Ngày 29 tháng 7 năm 2024, một chiếc TV IMPEX LED Gloria 32 được mang đến sửa chữa. Đến ngày 18 tháng 1 năm 2025, nó quay trở lại với lỗi không hiển thị hình ảnh, nhưng âm thanh vẫn hoạt động bình thường. Chủ nhân chiếc TV là một người hàng xóm tốt bụng, làm việc tại cửa hàng tạp hóa đối diện nhà tôi. Vì vậy, tôi ưu tiên sửa chữa cho anh ấy.
Nghi ngờ vấn đề nằm ở đèn nền, tôi tháo vỏ sau và kiểm tra. Điện áp đo được khoảng 72V rồi giảm xuống, xác nhận dự đoán của tôi. Tôi tháo cáp LVDS khỏi bo mạch và cả băng dính cố định, sau đó tháo bốn con ốc ở cạnh khung và nhẹ nhàng tách màn hình ra. Quá trình này khá dễ dàng vì màn hình không quá lớn.
Chỉ có một tấm tản sáng trên bộ phản xạ đèn nền. Sau khi tháo các ốc vít và hai tấm đệm ở giữa, tôi thấy các đèn LED. Mỗi dải có sáu đèn LED, các đầu bị cong. Một dải bị hỏng, dải còn lại hoạt động tốt (kiểm tra bằng thiết bị kiểm tra đèn nền LED, cho thấy điện áp tiêu thụ khoảng 35,5V, nghĩa là mỗi đèn LED là 6V). Các dải LED không được dán bằng băng keo, sáu ốc vít trên mỗi dải đủ để giữ chặt đế nhôm tản nhiệt.
Các kết nối ở giữa. Việc nối dây nối tiếp dẫn đến đèn nền tắt vì không có dòng điện được lấy và được bộ xử lý cảm nhận trong phản hồi.
Tôi gọi điện đến cửa hàng linh kiện điện tử, mang đèn LED bị hỏng đến lấy đồ thay thế (vì là tối muộn ngày thứ Bảy). Sau đó, tôi lắp lại bộ phản xạ, tấm tản sáng, màn hình và khung. Việc này cần sự cẩn thận. Sau khi bật nguồn, đèn nền sáng lên. Công việc hoàn tất nhanh chóng và dễ dàng hơn tôi tưởng.
Tác giả: Parasuraman Subramanian, 74 tuổi, hơn 30 năm kinh nghiệm sửa chữa thiết bị cổ điển (máy thu thanh, amply, máy ghi âm cuộn băng), hiện đang học các lớp công nghệ mới do Hiệp hội Kỹ thuật viên Điện tử Kerala tổ chức. Ông tốt nghiệp BBA, có bằng kỹ sư vô tuyến tư thục và nghỉ hưu với chức danh Giám đốc điều hành của một công ty Mỹ. Hiện ông đang làm cố vấn cho bệnh viện và các tổ chức khác.
Chi phí sửa chữa: Không được đề cập trong bài viết.
Bình luận của chuyên gia Albert van Bemmelen: “Tất cả các sửa đổi mới mà bạn phải thực hiện để khắc phục sự cố chắc chắn sẽ làm tăng cường độ khó cho bất kỳ lần sửa chữa nào trong tương lai nếu chiếc TV này quay lại với bạn.”
Hashtag:
#SuaChuaTV #SuaChuaNhanh #TVHong #DenNen #IMPEX #Gloria32 #KyThuật #ĐiệnTử #ChuyenGia #ThuThuat
Ghi chú: Do bài báo gốc không đề cập chi phí sửa chữa, nên tôi không thể chuyển đổi sang VND.
Hãy viết bài báo dài đầy đủ chuyên nghiệp hay bằng tiếng VIệt kèm hashtag In Came This TV As Predicted By An Expert, But For A Ddifferent Reason – IMPEX LED TV GLORIA 32
I request you all to read the article in this link and read our Repair Expert Albert van Bemmelen’s comments under it, which I am reproducing after giving the link:
‘All new made modifications you had to make to fix the issue no doubt will intensify any future repair if this tv revisits you next time’
This TV given out on 29th July, 2024 made a revisit on 18th of January, 2025 with the complaint that there was no display, but sound was ok. As mentioned in my previous article this belonged to an employee who works in the grocery shop opposite to my house and I had a social responsibility too to attend to it on priority as they do not have any other entertainment in the house and moreover, this guy was too nice, calm and composed to deal with. I had gone out to attend a meeting and his sons were waiting for my return to hand over the TV. I suspected backlight problem and quickly removed the back cover and checked and found that the voltage was building upto around 72V and dropping, which confirmed my doubt. I removed the LVDS cable from the scalar board and detached it from its tapes too and made it free. Then removed the four screws at the sides of the frame and gently detached it to view the panel. Then used an expired credit card to insert on the sides and detach it from the bottom sheet and gently moved the panel to my bed on the other room. This movement was easy as the size of the panel was not very big and I did not have to do belly dancing! (LOL)
There was only a single diffuser sheet on top of the backlight reflector, which I removed to view the backlights that were fixed with screws and not glued to the metal body:
The reflector could be removed once the screws and two sheet spacers in the middle portion were removed and then the lamps were visible. There were six LEDs in each strip, which had the ends bent as you can see in the following picture. One strip was dead whereas the other was ok, when I checked it with the backlight LED tester, which indicated a voltage of around 35.5 consumed, which meant that the LEDs were of 6V. The strips were not pasted with any tape as six screws on each strip were good enough for holding the aluminium base tight for heat dissipation. Let us have a look:
The last picture shows that the connectors were in the middle. The wiring was in series because of which the backlight shut off as there was no current drawn by the strip and sensed by the processor in the feedback.
I phoned up the electronic spare shop in the town and told him to hang on for me and carried the defective LED lights and rushed to fetch replacement, as it was a Saturday late evening and once it was closed I might have to wait until Monday afternoon on my return from duty in the hospital. Then re-fixed the reflector with screws and put the diffuser sheet on top and then moved the panel onto the top and fixed the frame. The frame was fixed only after ensuring that the panel was in its proper place and resting on its bed within the frame.
All these works were to be handled with due attention and care. Then applied power and I was glad to see the backlight lit up and I could finish the job in record time. The work was relatively very simple and I think that I have never replaced the backlight of a TV so easily before.
Mission accomplished with vigor and enthusiasm that made my week end job more than satisfactory to get qualified for entry into the collection 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.
Please give a support by clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.
P.S-If you enjoyed reading this, to subscribe to my blog (free subscription). That way, you’ll never miss a post. You can also forward this website link to your friends and colleagues-thanks!
You may check on his previous article on
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(tiêu đề viết lên đầu)
In Came This TV As Predicted By An Expert, But For A Ddifferent Reason – IMPEX LED TV GLORIA 32
I request you all to read the article in this link and read our Repair Expert Albert van Bemmelen’s comments under it, which I am reproducing after giving the link:
‘All new made modifications you had to make to fix the issue no doubt will intensify any future repair if this tv revisits you next time’
This TV given out on 29th July, 2024 made a revisit on 18th of January, 2025 with the complaint that there was no display, but sound was ok. As mentioned in my previous article this belonged to an employee who works in the grocery shop opposite to my house and I had a social responsibility too to attend to it on priority as they do not have any other entertainment in the house and moreover, this guy was too nice, calm and composed to deal with. I had gone out to attend a meeting and his sons were waiting for my return to hand over the TV. I suspected backlight problem and quickly removed the back cover and checked and found that the voltage was building upto around 72V and dropping, which confirmed my doubt. I removed the LVDS cable from the scalar board and detached it from its tapes too and made it free. Then removed the four screws at the sides of the frame and gently detached it to view the panel. Then used an expired credit card to insert on the sides and detach it from the bottom sheet and gently moved the panel to my bed on the other room. This movement was easy as the size of the panel was not very big and I did not have to do belly dancing! (LOL)
There was only a single diffuser sheet on top of the backlight reflector, which I removed to view the backlights that were fixed with screws and not glued to the metal body:
The reflector could be removed once the screws and two sheet spacers in the middle portion were removed and then the lamps were visible. There were six LEDs in each strip, which had the ends bent as you can see in the following picture. One strip was dead whereas the other was ok, when I checked it with the backlight LED tester, which indicated a voltage of around 35.5 consumed, which meant that the LEDs were of 6V. The strips were not pasted with any tape as six screws on each strip were good enough for holding the aluminium base tight for heat dissipation. Let us have a look:
The last picture shows that the connectors were in the middle. The wiring was in series because of which the backlight shut off as there was no current drawn by the strip and sensed by the processor in the feedback.
I phoned up the electronic spare shop in the town and told him to hang on for me and carried the defective LED lights and rushed to fetch replacement, as it was a Saturday late evening and once it was closed I might have to wait until Monday afternoon on my return from duty in the hospital. Then re-fixed the reflector with screws and put the diffuser sheet on top and then moved the panel onto the top and fixed the frame. The frame was fixed only after ensuring that the panel was in its proper place and resting on its bed within the frame.
All these works were to be handled with due attention and care. Then applied power and I was glad to see the backlight lit up and I could finish the job in record time. The work was relatively very simple and I think that I have never replaced the backlight of a TV so easily before.
Mission accomplished with vigor and enthusiasm that made my week end job more than satisfactory to get qualified for entry into the collection 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.
Please give a support by clicking on the social buttons below. Your feedback on the post is welcome. Please leave it in the comments.
P.S-If you enjoyed reading this, to subscribe to my blog (free subscription). That way, you’ll never miss a post. You can also forward this website link to your friends and colleagues-thanks!
You may check on his previous article on
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