LG 60PZ550-UA has picture and sound via tuner but no HDMI and no video on AV

[SdlewisSr]

Hi everyone
I have an LG 60PZ550-UA that has picture and sound via the tuner but no HDMI and no video on AV, but has audio on AV.
The main board identifiers are: (see attached photos)
GP2-R-BCM PDP PU13A
EAX63546403(1)
10.10.30 L.S.W

I have the service manual but have found typos. Some of the typos I have figured out. On the main board I still cannot find L201 or IC200, but I did find an L200 and IC201.

These are the voltages that I have check and are good.
Main board voltages:
L402, L405, L414, L415, L416 = +5V
L403 = +17V
L411, L413 = +3.3V
IC403 = +2.5V

L200 and IC201 are on the back of the main board. I would appreciate any suggestions on how to measure the voltages on the back of the main board with the cables connected to it.

My thinking thus far is that I should be looking for something that HDMI and AV (video) have in common.

Thanks in advance for any help

[dick_barton]

Re: LG 60PZ550-UA has picture and sound via tuner but no HDMI and no video on AV

If the problem was due to a lightning strike then it may have taken down the HDMI/AV chip which looks like IC200 which is alongside the 3 hdmi ports in your photo.

[SdlewisSr]

Re: LG 60PZ550-UA has picture and sound via tuner but no HDMI and no video on AV

Thanks dick_barton
I said that I "cannot find L201 or IC200", but I did not mean to include "IC200". It was only L201 that I could not find.
We did think that it may have been a lightning strike.

[SdlewisSr]

Re: LG 60PZ550-UA has picture and sound via tuner but no HDMI and no video on AV

UPDATE
I believe the problem is IC501 ( LGE3549XSP). I have since verified that the COMP and RGB-PC inputs do not work, in addition to the HDMI and AV (video) inputs. Since the TV works just fine through the tuner, I plan on replacing the main board.

[SdlewisSr]

Re: LG 60PZ550-UA has picture and sound via tuner but no HDMI and no video on AV

Just a note to finalize this thread. I was unable to find a replacement main board. Therefore I sent the bad main board out to be repaired and got it back 9 days later. I put it in and the TV works like a charm. Thanks for the help

[syaoran123]

Re: LG 60PZ550-UA has picture and sound via tuner but no HDMI and no video on AV

so which part of the mainboard was defective?

[SdlewisSr]

Re: LG 60PZ550-UA has picture and sound via tuner but no HDMI and no video on AV

I wish I knew. They did not provide me with that information. If I can find out I will update this thread later.

[SdlewisSr]

Re: LG 60PZ550-UA has picture and sound via tuner but no HDMI and no video on AV

I contacted the company that did the repair to find out what was actually replaced on the board. I was told "the tech changed the IC that corresponds with your issue. I'm sorry but we do give out the part number and the location of the part that was changed."
As I mentioned earlier in this thread, I believe the problem was IC501 ( LGE3549XSP) since it is common to all the affected video inputs (see attached pages from the service manual).

[Malachi]

Re: LG 60PZ550-UA has picture and sound via tuner but no HDMI and no video on AV

Pretty crappy that they won't tell you. You should be able to tell by looking at the soldering. .

[SdlewisSr]

Re: LG 60PZ550-UA has picture and sound via tuner but no HDMI and no video on AV

I no longer have the TV. I returned it to the owner.