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LG 50PZ950T - No picture, sound ok.

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Turnip:
Hi folks,

Got one in where cust said he needed turn set on and off several times before a picture would occur - Sound fine. Now picture doesn't appear at all. Wonder if anyone has ideas ? - Thanks - Chris.

downunder:

Hi Chris,

I usually start off by ohms checking Vs to ground. If shorted, unplug Z-SUS and check again. If still shorted, Y-SUS is the culprit.
I'll upload the Trump version of the service manual to the forum, but there's probably not much that will be helpful.


Bruce

Turnip:
Thanks Bruce,

Turned it on this morning - Normal sound and picture. Tried again - Just sound. Tried again, nothing at all so left it on for a half hour, rewarded with normal sound and picture.

Whilst it wasn't working, measured all voltages on power board - All OK. As its an LG - Maybe cook the SSB ?  - Chris.

downunder:

Hi Chris,

When its n/w, are you able to bring up test patterns by shorting the copper pinholes on the control board?

Bruce

Turnip:
Hi Bruce,

Noted when the set gives a picture the Led on the control board flashes four and four. When just sound, it doesn't flash at all.

Checked regulators and both read 3.4v out whether picture or not. Manual suggests if Led doesn't flash there's an issue on the control board where an oscillator isn't working.

Dubious, as at times don't even get sound, so feel the control board isn't the issue. Itching to cook the SSB - Chris.

PS - Manual gave no info about shorting pinholes for test patterns. Noticed a couple but unsure.

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