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Search: Posts Made By: SmartSarah
Forum: Troubleshooting TVs and Video Sources 08-10-2022, 11:27 AM
Replies: 43
Views: 1,068
Posted By SmartSarah
Re: Sharp LC70LE747 Flickering - darkening gradually to the right side

I am on to something. If I apply 12v to the PNL power supply beforehand, the unit seems to start up correctly every time. I am going to use a scope to further investigate whether this voltage reaches...
Forum: Troubleshooting TVs and Video Sources 07-02-2022, 06:21 AM
Replies: 43
Views: 1,068
Posted By SmartSarah
Re: Sharp LC70LE747 Flickering - darkening gradually to the right side

I'm puzzled why it remains good as soon as it starts good.
Once running fine, I can tap on components and parts, it stays good.
Running bad, it appears to be immune to mechanical interference like...
Forum: Troubleshooting TVs and Video Sources 07-02-2022, 05:20 AM
Replies: 43
Views: 1,068
Posted By SmartSarah
Re: Sharp LC70LE747 Flickering - darkening gradually to the right side

Small update on this.
It's all in the boot of the TV.
I follow this procedure nowadays.
Bad image -> pull the mains socket -> reboot (= cold restart with large red SHARP logo).
Again bad image ->...
Forum: Troubleshooting TVs and Video Sources 05-28-2022, 06:47 AM
Replies: 43
Views: 1,068
Posted By SmartSarah
Re: Sharp LC70LE747 Flickering - darkening gradually to the right side

I've measured 6 x caps 470F, all good. C7133, C7130, C7123, C7120, C7950A, C7950B.
Replaced C7123 by a new 1000F. No difference.
Forum: Troubleshooting TVs and Video Sources 05-28-2022, 04:44 AM
Replies: 43
Views: 1,068
Posted By SmartSarah
Re: Sharp LC70LE747 Flickering - darkening gradually to the right side

The original T-CON has always been in place. I just swapped it shortly but since it made no difference I installed the original back.
Ok, at least I'll start measuring the 12V caps. I'm not sure if...
Forum: Troubleshooting TVs and Video Sources 05-28-2022, 03:08 AM
Replies: 43
Views: 1,068
Posted By SmartSarah
Re: Sharp LC70LE747 Flickering - darkening gradually to the right side

Update - the problem returned
Inspection
- MONITOR ERR CAUSE: all 4 positions "00 0000000000000"
- BL voltages 190V, current 22mA (measured with DC current clamp)
Observations
- I've noticed...
Forum: Troubleshooting TVs and Video Sources 05-27-2022, 06:20 AM
Replies: 43
Views: 1,068
Posted By SmartSarah
Re: Sharp LC70LE747 Flickering - darkening gradually to the right side

Oh, I read only the page you indicated me earlier. I didn't realise what an information treasure you posted to me. I am sorry for this aberration.
Forum: Troubleshooting TVs and Video Sources 05-27-2022, 03:35 AM
Replies: 43
Views: 1,068
Posted By SmartSarah
Re: Sharp LC70LE747 Flickering - darkening gradually to the right side

Okay. that's the PNL 12V on the PSU board.
How did you figure out this detail?
Forum: Troubleshooting TVs and Video Sources 05-27-2022, 02:17 AM
Replies: 43
Views: 1,068
Posted By SmartSarah
Re: Sharp LC70LE747 Flickering - darkening gradually to the right side

The set appears to operate normally the last few days.
Reason? More in use lately, warmer room temperature, mechanical manipulations, ...
The vertical image jumping is there sometimes on top of the...
Forum: Troubleshooting TVs and Video Sources 05-26-2022, 08:18 AM
Replies: 43
Views: 1,068
Posted By SmartSarah
Re: Sharp LC70LE747 Flickering - darkening gradually to the right side

A few assumptions
Which module can move the image vertically?
The panel? I do not think so. Streaks, lines, dark, etc but not moving an image seems to me.
T-Con? Definitely, which is exactly what...
Forum: Troubleshooting TVs and Video Sources 05-25-2022, 03:05 PM
Replies: 43
Views: 1,068
Posted By SmartSarah
Re: Sharp LC70LE747 Flickering - darkening gradually to the right side

The included video is during a reasonable start-up.
(Don't be mislead by the colours my camera made out of it.. The start-up logo is red on black and not white on blue as the video apparently looks...
Forum: Troubleshooting TVs and Video Sources 05-25-2022, 09:39 AM
Replies: 43
Views: 1,068
Posted By SmartSarah
Re: Sharp LC70LE747 Flickering - darkening gradually to the right side

Bad news. The problem returned.
Backlight
- BL voltage on the 3 strings are identical, 190VDC and stable
- Looking from the back the backlight illumination is steady
I can't get my head around...
Forum: Troubleshooting TVs and Video Sources 05-24-2022, 11:56 AM
Replies: 43
Views: 1,068
Posted By SmartSarah
Re: Sharp LC70LE747 Flickering - darkening gradually to the right side

Small update
In order to measure the BL voltages I hooked up a small multi-meter with it's tilt-stand hanging on the power board.
Since then the TV worked normally.
So bad joint close to the upper...
Forum: Troubleshooting TVs and Video Sources 05-23-2022, 04:27 PM
Replies: 43
Views: 1,068
Posted By SmartSarah
Re: Sharp LC70LE747 Flickering - darkening gradually to the right side

Therefore I've set BL to where it was initially.
Anyway to be continued.
Forum: Troubleshooting TVs and Video Sources 05-23-2022, 04:18 PM
Replies: 43
Views: 1,068
Posted By SmartSarah
Re: Sharp LC70LE747 Flickering - darkening gradually to the right side

Need to wait before it goes bad again. There is no problem right now.
The voltages on the 3 led strings are identical now. Depending on BL level between 130 and 191 Volt. Assumingly normal.
Forum: Troubleshooting TVs and Video Sources 05-23-2022, 03:34 PM
Replies: 43
Views: 1,068
Posted By SmartSarah
Re: Sharp LC70LE747 Flickering - darkening gradually to the right side

BL goes from -16 tot +16 on this set. I brought it down to -8, no effect. Even after power cycle. Did the same BL to -16 and power cycle. No result.
I noticed something weird tough. After powering...
Forum: Troubleshooting TVs and Video Sources 05-23-2022, 03:12 PM
Replies: 43
Views: 1,068
Posted By SmartSarah
Re: Sharp LC70LE747 Flickering - darkening gradually to the right side

The video goes bad as well, vertically misplaced.
Sometimes when I power the TV off for 10 minutes and back on, the fault disappears and it won't return during that session. A short power cycle...
Forum: Troubleshooting TVs and Video Sources 05-23-2022, 01:00 PM
Replies: 43
Views: 1,068
Posted By SmartSarah
Sharp LC70LE747 Flickering - darkening gradually to the right side

Dear,

I can not pinpoint the following problem on my Sharp TV LC70LE747E.
While the left side of the screen is not affected at all the right side of the screen gradually fades to a kind of dark....
Forum: Troubleshooting TVs and Video Sources 12-18-2016, 02:29 AM
Replies: 18
Views: 7,684
Posted By SmartSarah
Re: Lg - 32lh3000, 32lh5000 - dead no output

Great!
As soon as I discovered R501 to be open, I stopped diagnosing and replaced parts.
Job done! Won a lot of time thanks to this thread!
Forum: Troubleshooting TVs and Video Sources 07-30-2016, 05:00 AM
Replies: 311
Views: 78,713
Posted By SmartSarah
Smile Re: Sharp LC-40LE810UN question

I had the AC-Det error (2 slow and 1 fast blinks) on a LC-40LE810E. Power at PB connector pins 1-2 and 3-4 came up for a few seconds to 12.9 V and then dropped to zero.
I didn't try anything else...
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