LG 32LC7D no sound

[jstiene]

Re: LG 32LC7D no sound

Here are a couple pictures of the main board. Thanks for taking a look.

[tom66]

Re: LG 32LC7D no sound

As expected there are a variety of voltage regulators on this main board. See this post for how to identify and test such devices.

https://www.badcaps.net/forum/showth...329#post261329

[jstiene]

Re: LG 32LC7D no sound

Hi Tom, so I went ahead and checked voltage readings on all the regulators that I could locate. I listed the values below. Problem is I dont recognize any of the part numbers and have difficulty matching them on datasheet.com. Are you familiar with any of these or recognize any faulty values

Measured values: LG 32LC7D-UB

IC4022
BA022 7197
Pin1: 4.95
Pin 2: 0
Pin 3: 3.34

IC4016
KA78 09R
Pin 1: 12.02
Pin 2: 0
Pin 3: 8.95

IC4003
EH16A 64J48
Pin 1: 0
Pin 2: 3.27
Pin 3: 4.95

IC4008
SC156615M 0637 G0613111-1
Pin 1: 3.37
Pin 2: 3.34
Pin 3: 0
Pin 4: 1.19
Pin 5: 2.60

IC4013
05DZ11 sharp HU0
Pin 1: 6.45
Pin 2: 3.22
Pin 3: 4.95
Pin 4: 0.01
Pin 5: 0.00

[tom66]

Re: LG 32LC7D no sound

All regulators appear to be working fine. I can think of a few other tests, but will need a schematic of the main board.

[jstiene]

Re: LG 32LC7D no sound

Hi Tom, thanks for the assistance. Unfortunately I do not have access to a schematic diagram. I will take a look online and see if I can find one.

Have you seen this problem before where the HDMI video is find but not the cable input?

[tom66]

Re: LG 32LC7D no sound

Yes. It can be caused by a power surge damaging the HDMI processor (the device marked "10Bit")

[jstiene]

Re: LG 32LC7D no sound

So the HDMI processor also controls the analog/digital cable input? Just to be clear, the HDMI works fine.

Sorry..you probably already knew that but wanted to make sure...

[tom66]

Re: LG 32LC7D no sound

Sorry, got that the wrong way around. In this case it would be a result of the cable/DTV tuner being damaged by a power surge or external event (wire touching cable line or local transient.)