Samsung No Start fix.

[Twithers]

I recently had a Samsung LN46A550 that wouldn't power on. It would click with the red light flashing with no other progress.

I went to ShopJimmy to look at buying a Mainboard and came across the repair kit:

http://www.shopjimmy.com/samsung-bn9...550p3fxza.htm#

I work at an electronics repair business, so I took the mainboard in to have a better look at it.

I pulled the cap mentioned in the repair kit off to put a new one on, but the only one I had on hand that was close enough was physically too big and I didn't want to rig it on there.

So, I reattached the cap and while I was there, I reflowed the legs of the IC just below the cap that is listed in the repair kit.

After reinstalling the mainboard, the TV works great, so my assumption is that either the cap or the IC or both had solder issues causing the no start condition.

If you have the same problem, you might try reflowing those 2 components and see what happens.

Hope this helps.

[budm]

Re: Samsung No Start fix.

It's known the common failure issue on these Samsung, just replace C102 will fix the problem. You can also try 100uF low ESR lytics cap in parallel just to see if the problem will go away to verify if it is the cap problem or not, I never have to replace the IC yet.

[Twithers]

Re: Samsung No Start fix.

I have 2 Sanyo's (DP42740 and DP 37647) with nearly identical no start problems. Have you seen similar component failures on the mainboard? I found good info on the Samsung problem, but very little on these Sanyo's.

[Shane711]

Re: Samsung No Start fix.

Clicking while trying to turn on: The Sanyo (DP42740 and DP 37647) most likely have a problem with the EEPROM which is different from the Samsung's which is usually bad capacitors on the power board or the problem with the capacitor and or IC on the main board that budm describes in post #2

If you do not see blown capacitors on the power board then the problem is likely to be the main board.