Forum: Troubleshooting TVs and Video Sources
12-09-2021, 10:06 PM
|
|
Replies: 28
Views: 1,766
Re: TCL 75R615 has sound, no backlight
I replaced the cap as well as resoldering the heatsink and mosfets. I was too impatient to wait for the LCR meter to arrive. TV seems to power up normally!!! Great news. Thanks to all for the...
|
|
Forum: Troubleshooting TVs and Video Sources
12-09-2021, 08:30 AM
|
|
Replies: 28
Views: 1,766
Re: TCL 75R615 has sound, no backlight
I kind of thought about that, even though I was not sure.....is it because my meter is powered with a 9v battery it doesnt have enough voltage to trigger the mosfet to turn on/off? I know that...
|
|
Forum: Troubleshooting TVs and Video Sources
12-08-2021, 08:35 AM
|
|
Replies: 28
Views: 1,766
Re: TCL 75R615 has sound, no backlight
I am still struggling in testing out these two mosfets, Im unable to re-create the testing results using 3 different multimeters I have with diode mode......Im not sure if Im doing something wrong or...
|
|
Forum: Troubleshooting TVs and Video Sources
12-07-2021, 08:07 PM
|
|
Replies: 28
Views: 1,766
Re: TCL 75R615 has sound, no backlight
Ok, so I removed the heatsink that attaches to the two mosfets, I understand this is probably overkill but I wanted to be as throrough as possible. Please see the attached picture with both of the...
|
|
Forum: Troubleshooting TVs and Video Sources
12-07-2021, 09:53 AM
|
|
Replies: 28
Views: 1,766
Re: TCL 75R615 has sound, no backlight
Ok, does anyone have a good source for how I should be testing these particular mosfets? Ive viewed a few videos on youtube, but just looking for suggestions.....
Thanks!
|
|
Forum: Troubleshooting TVs and Video Sources
12-06-2021, 06:15 PM
|
|
Replies: 28
Views: 1,766
Re: TCL 75R615 has sound, no backlight
I tested both QW301 & QW302 in circuit and they are testing open across all legs.....I'm assuming per previous post that this means they are most likely good....
|
|
Forum: Troubleshooting TVs and Video Sources
12-06-2021, 01:01 PM
|
|
Replies: 28
Views: 1,766
|
|
Forum: Troubleshooting TVs and Video Sources
12-06-2021, 08:41 AM
|
|
Replies: 28
Views: 1,766
Re: TCL 75R615 has sound, no backlight
QW301 & QW302, as far as testing them....can they be tested in circuit, or do they need to be removed to be tested, I just want to make sure I do it the correct way.....im sure I can google a testing...
|
|
Forum: Troubleshooting TVs and Video Sources
12-05-2021, 09:18 PM
|
|
Replies: 28
Views: 1,766
Re: TCL 75R615 has sound, no backlight
When you say take the disc cap out of circuit, I'm assuming you mean the one that blew up and not another one near it or a different one? I did desolder it took it out of circuit and it tested...
|
|
Forum: Troubleshooting TVs and Video Sources
12-05-2021, 06:41 PM
|
|
Replies: 28
Views: 1,766
|
|
Forum: Troubleshooting TVs and Video Sources
12-05-2021, 05:37 PM
|
|
Replies: 28
Views: 1,766
|
|
Forum: Troubleshooting TVs and Video Sources
12-05-2021, 05:14 PM
|
|
Replies: 28
Views: 1,766
Re: TCL 75R615 has sound, no backlight
So, I got some help yesterday to take the TV off the wall and got the back off to check out the boards....I did find a capacitor that was blown out,looks to be C312 a ceramic disc capacitor, very...
|
|
Forum: Troubleshooting TVs and Video Sources
11-29-2021, 05:31 PM
|
|
Replies: 28
Views: 1,766
TCL 75R615 has sound, no backlight
Have had this TV since June 2019, worked fine till today. Daughter was watching it and made a noise and went dark. I unplugged, left off then powered back on, no change. You can see the image with...
|
