JVC LT-32A61SU bad picture

[coojoe_213]

Hi all.
I have this tv, when i turn on tv without signal, everything is perfect /i have perfect blue screen, perfect ''menu panel''/.
When i put the cable for tv, or then i connect dvd or blu ray player, the picture is.....some of solarized or ... i don't know...., but the menu panel is still perfect.

I thing..., may be chip AS15-F on the t-con, but i don't have this chip on the t-con.
On the t-con i have 32 pin chip MAXIM1518E.
Should I check the Tcon or the Mainboard first?

[dick_barton]

Re: JVC LT-32A61SU bad picture

Post a phoro of your circuit boards.

[Andrew F. Ali]

Re: JVC LT-32A61SU bad picture

Let's see pics of your symptom please.

[coojoe_213]

Re: JVC LT-32A61SU bad picture

Pics 4, 5 and 6 of first post is a pictures with symptoms /bad pictures/.

Here is a serv. maunal:

[dick_barton]

Re: JVC LT-32A61SU bad picture

it does look like a Tcon fault but better to see what others think. There are various voltage points on the Tcon board which you could measure the volatges at.
V3D3, V5V, VGHC, VGH, V2D5 etc.

[coojoe_213]

Re: JVC LT-32A61SU bad picture

All GAMMA voltages is no more than 1.30V (0.98, 1.13, 1.26, 0.18 V etc), this is may be bad.

Here is voltage on my T-con:

2VS/DC- 4.91V
VGHC-26.1V
VGH-26.6
VGL-6.1V
VCOM2-6.1V
COMF2-6.1V
VIN-3.31V
V2D5-2.5V
AVDD-13.6V
V5V-5.0V
V3D3-3.3V
ASYC RST-3.3V
LVDS- 3.23V
VGMA- 12.91V
V2REF1 - 2.5V
REF/F1-12.86V

[dick_barton]

Re: JVC LT-32A61SU bad picture

The supply voltages look reasonable and the reference voltages appear to be there. Looks like you may be right and the gamma chip is faulty.

[coojoe_213]

Re: JVC LT-32A61SU bad picture

Thanks for reply, i'll buy this one from aliexpress
http://www.aliexpress.com/item/MAX15...e-b1b118556ea8

[dick_barton]

Re: JVC LT-32A61SU bad picture

That center area of the chip will be soldered onto the pcb. Do you have the equipment to remove it?

[coojoe_213]

Re: JVC LT-32A61SU bad picture

Yes, i know. I find in Bulgaria this chip. Saturday will be here. I'll post a pics.

[coojoe_213]

Re: JVC LT-32A61SU bad picture

The problem is on main board. I find worked t-con, and when i replaced t-con, the problem was the same. Thanks all for help.

[kc8adu]

Re: JVC LT-32A61SU bad picture

not sure how mainboard can do that.thats a gamma regulator issue.
i suspect your replacement tcon is bad too.

[coojoe_213]

Re: JVC LT-32A61SU bad picture

No, i told you. I find anather one, which work, absolutly same number part, and the problem was same. What you thing about AV Processor on main board?

[Kilroys]

Re: JVC LT-32A61SU bad picture

Or could it be noise in the picture as the service informations said

[coojoe_213]

Re: JVC LT-32A61SU bad picture

Or could it be noise in the picture as the service informations said

Thanks a lot. Excellent information!!!