HDMI TV Broadcast Switcher With Faulty Output Repaired and Maintained
As I was walking out of church on a Sunday afternoon, the broadcast technician approached me with a technical problem in one of the broad cast devices that we have at church. He said that the HDMI output terminal was not signaling out any signals when plugged to the TV monitor. He wanted me to take it to my shop for check up.
That is an expensive device that we had in church for the past five years and
so far it was doing a great job till today so let us open the device and find out what went wrong.
That is the brand name and the technical information about this device. When I tried to open it in the shop I could not find any kind of screws to take out.
Since it has a rubber pads on both side I assumed there are hidden screws beneath; when I took the four screws out off the four corners and try to pry it open I discovered that there was another hidden screw under the center tag and once this screw was taken out as well I was able to open it and see the fault within.
I disconnected the fan and the ribbon cable and end up only with the main board that has all the HDMI inputs and outputs on.
Of course, more screws hidden under the heat tape over the heat sink and once these screws were out I was able to see the main board very clearly.
I checked all the filters around the HDMI and they all checked fine then I
moved on to the HDMI pins and when checking them under a microscope most of the pins had cold soldering joints and had to be addressed.
I applied flux and re soldered all the HDMI pins and hopped for the best because if that does not restore the display then I will be dealing with the main HDMI IC chip in that area and to be honest I do not have such an IC in my shop.
I could not use the heat gun in this case due to a lot of tiny components around there and there was plastic as well next to the port so I preferred to use my fine tip soldering iron and it worked just fine as seen in the photo.
The technician told me to keep it in the shop for trial to make sure all is well before using it again for our church broadcast next Sunday. I am sure it is going to be just fine.
Mission Accomplished
This article was prepared for you by Waleed Rishmawi, one of our ‘Master Authors’ and currently working in the Bethlehem area of Palestine repairing electrical and electronic equipment.
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Note: You can check his previous article on A Microwave Oven With Heat Issue Repaired And Maintained
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Albert van Bemmelen
April 19, 2025 at 5:29 pm
Fixing the 19 copper tracks and its soldered pins to any HDMi port is always a hassle. So good job!
And nowadays even audio is put out over the HDMi ports to attached television sets. Like on the Raspberry Pi 400 computers that do not have any ordinary audio output connectors anymore.
Waleed Rishmawi
April 20, 2025 at 12:12 am
Albert: yes they are hassle to do but it is easier when you have a microscope that give you a detailed closer look on all these pins. Have a blessed day
Parasuraman S
April 19, 2025 at 6:35 pm
An abrupt end to the article, without giving more details about the inside, was a bit disappointing, dear friend! Anyhow, I have not heard of such a device and was curious to know more!
Waleed Rishmawi
April 20, 2025 at 12:09 am
Parasuraman: sorry for the disappointment but I did not find any schematics for this device and the only fault was the HDMI port that had dry solder pins and it was fixed. Have a blessed day.
Mark
April 19, 2025 at 8:26 pm
Dry solder joint can be a real problem, but well done on such fine and detailed work.
Waleed Rishmawi
April 20, 2025 at 12:13 am
Mark: thanks man. Microscope can make things easier when doing such detailed work. Have a blessed day
Yogesh Panchal
April 19, 2025 at 11:22 pm
Good Job! Waleed
If there was no microscope, this would be difficult.using KAPTON tape for covering surrounding components would be helpful so that tiny components do not blew off.
Waleed Rishmawi
April 20, 2025 at 4:49 pm
Yogesh: yes totally agree. Have a blessed day
Mark J
April 20, 2025 at 2:47 am
Waleed great job on the repair. I am curious what microscope to you use in your repairs?
Waleed Rishmawi
April 21, 2025 at 3:26 pm
MarkJ: I am using Amscope microscope, expensive but worth every penny. Have a blessed day
Imoudu
April 21, 2025 at 5:21 am
Certainly this most be delicate repair,hope we are going to get a feedback if it worked or not in the church, well done.
Waleed Rishmawi
April 21, 2025 at 3:28 pm
Imoudu: yes it is a delicate work that I enjoyed very much and yes worked just fine. Have a blessed day