The BenQ LCD Observe design FP731 challenge is no power symptom. Should you have study my previous content articles, you would realize that I’d not instant use all my testing gear to check the entire power and inverter board instead I would use my eyes to scan all of the elements very first just before beginning to use my digital multimeter to examine about the fuse along with other elements first.
I saw about 8 filter capacitors that had bulged and leaked on top of its capacitor casing. We have the very first clue and when my assumption is suitable, only the capacitors that triggered no energy signs and symptoms. However to be able to be within the secure side we need to examine other elements at the same time.
Seeking in the energy primary side did not reveal any burnt or cracked components within the board. It’s not wonderful sufficient just by seeking in the board, we must check few of the vital components initial to be able to validate that it is safe to switch to the power after the alternative from the eight faulty capacitors. The crucial elements that I referred to was the fuse, energy or chopper fet (mosfet), change mode power provide main winding and secondary diodes. If you ever have the experienced, you can examine all the components on board without removing it but obviously the smps primary winding you must use a flyback tester to examination it.
Following all the essential components tested alright, I’d presume that following the alternative from the defective capacitors, I could right away switch for the LCD Keep an eye on without connecting a light bulb initial. There is no required to connect the light bulb given that the energy side elements were tested alright apart from the fuse didn’t blow in the 1st place.
For your information, a lot of the capacitors used within the LCD power supply had been from the 105 degree Celsius so that you can last longer and stand the heat create through the power supply alone. If you ever swap with the 85 Celsius capacitor, it would not last lengthy and may perhaps arrive back again with capacitor challenges once again.
The Benq FP731 LCD Check difficulties was restored to normal operation following the 8 filter capacitors was replaced. Capacitors breakdown was extremely frequent inside the LCD Watch because of it compact design where the heat have problems to transfer out because of the power supply board was covered by an aluminum shielding. In some cases following few hrs of operation, you might really feel the severe heat at the aluminum shielding and bordering area. This is a superior news to us as an electronic repairer because much more and additional LCD Keep track of mail in for restore due to capacitors faults only.