Re: Samsung LN40B610 flickering and dying

Tried shorting PC803S just now, no change. Monitored voltage while doing that and they were steady at 390v.

Re: Samsung LN40B610 flickering and dying

Dammit, I shoulda known that! Yeah, the probe ground was on the chassis. Used my second probe on the negative lead and the signals are basically identical.

I'll try shorting the PC803S later, but for now I watched the voltage, and at no point did it go below 389v, mostly sitting at 390v even when the backlight went off completely.

Re: Samsung LN40B610 flickering and dying

Alright guys, keep it civil.


Screen is definitely flashing uniformly. Backlight looks pretty stable for a couple seconds, then starts flickering (and you can hear the inverter struggling), and within 30 seconds from power on the backlight goes completely dead. It's possible to turn the TV off and back on and start that all over again.

I measured the transformers, they range from 1.52k to 1.58k, which is well within 5% tolerance (little under 2%).

Looking around at the "repair kits"...

Re: Samsung LN40B610 flickering and dying

Here's the pictures. I'll pull the board out tomorrow or sometime to get the bottom pic, but it's the same power supply as this one:

[url]http://www.shopjimmy.com/samsung-bn44-00264a-power-supply-backlight-inverter.htm[/url]

Don't think it's a panel issue, as the backlight [I]is[/I] actually what's flickering/flashing - I can see the backlight from the back of the TV, and it's definitely what is flashing. Tapping/squeezing didn't do anything, fyi.Re: Samsung LN40B610 flickering and ...<br /> Here's...

Picked this TV up as a freebie today. The backlight is flickering quite badly immediately after powering on, and eventually dies completely after a minute or two. First thought is the obvious - caps.

Stuck my scope on the two biggest caps in the TV (82uf 450v), and I'm getting around 150v of ripple on them! DC voltage is measuring around 389v across those caps, which are paralleled. I soldered a 120uf 450v cap across one of them, and it didn't help the flickering at all.

Suggestions? Not hard to replace all the caps, but I'd have to order and wait for good caps [I]or[/I]...

Re: New Members - please post your introductions here

Hello from Vancouver BC! I only signed up due to the restriction of not being able to view image attachments without an account (a dumb rule if you ask me).