SAMMY LN40A530P1F on the decline

[Penny.Jeter]

My question:
which mainboards can be used in this set (or am I strictly limited to the original BN97-01985n)? I'd imagine that the mainboard/power board combos span across a few models, and am wondering if anyone out there knows which would work with this set.

BACKSTORY:
I have the Samsung LN40A530P1F. Have used the extended warranty twice over the years to repair various CAP issues. Just recently (after almost 7 years or so of use), the TV shows very thin green vertical lines with a hint of picture behind it, and a high pitched audio screech.
With multiple restarts, it eventually started up.The other day it was unable to shake the green lines and screech though.

It would seem that I need a mainboard (a guess more than anything)-- as the DTV tuner also appears non-functioning. Was also having issues with composite and s video inputs.

The HDMI connected devices (apple TV and DTV on air tuner) have a normal startup splash screen (appear fine) when they first fire up, then when it switches to operating, said green lines and screeching.

Any additional ideas? Any recommended board retailers?

Thanks!

[tibimakai]

Re: SAMMY LN40A530P1F on the decline

If I remember well, somebody found a bad surface mount capacitor on a 46" mainboard and by replacing that, the TV it was working great after that.
Like a week ago, I have posted in that thread, asking if it can't be done, on a C series mainboard as well.

[Penny.Jeter]

Re: SAMMY LN40A530P1F on the decline

I am wondering if there is any particular mainboard model number compatible with this TV model that offers better results/stability than the original-- if for no other reason than the mainboard for this series is a bit pricey and hard to come by.

Had two different CAPS replaced over three repairs. On one repair, the service guy put in the higher capacity than original (wonder if that over time caused damage to boards).

[Penny.Jeter]

Re: SAMMY LN40A530P1F on the decline

FOLLOWUP-- so I ordered a TCON BOARD and the MAINBOARD for this model (just to be safe). Installed both and have only the "flashing standby" light on the TV. Nothing else.
Any ideas? What would cause a flashing standby light with no backlight or picture, no access to menus, etc.?

[Ltank]

Re: SAMMY LN40A530P1F on the decline

Are the P.S. Voltages good? What about the inverter if applicable? LED TV?

[Penny.Jeter]

Re: SAMMY LN40A530P1F on the decline

[my ignorance here-- I am here to learn]

Is there an easy way to test the PS voltages? and The ribbon cables to TCon and Mainboard too?

I only have a midrange multimeter on hand (no capacitance or ESR –– which is what I was told I may need to check in circuit).

Otherwise I'd have to yank each capacitor (is that right?).

I am also a bit skiddish to check-- I've never worked on a TV (generates high voltage to startup). I've only done a few small electronics, occasional stereo. I don't know if the meter I have can handle very high.

Thanks.

[nomoresonys]

Re: SAMMY LN40A530P1F on the decline

be careful when working with power supply HIGH VOLTAGE, I'd start with checking anything on your power supply marked F, F is for fuse, check with multimeter set on diode mode, should read 000 or close, if it's ol or gives no reading, then the fuse is probably bad.

[nomoresonys]

Re: SAMMY LN40A530P1F on the decline

I am wondering if there is any particular mainboard model number compatible with this TV model that offers better results/stability than the original-- if for no other reason than the mainboard for this series is a bit pricey and hard to come by.

Had two different CAPS replaced over three repairs. On one repair, the service guy put in the higher capacity than original (wonder if that over time caused damage to boards).

if the only part that was higher is volts, like the original was 25 volts and he put in 35, no problem but you want to keep the uf the same, from what I understand.

[nomoresonys]

Re: SAMMY LN40A530P1F on the decline

some good clear pics. might help.

[Penny.Jeter]

Re: SAMMY LN40A530P1F on the decline

[I will take some pics too.]

The CAPS all LOOK OK (no bulges or leaks). I believe the 25v were the replacements. It seemed to work OK after that repair for a few years.

more detailed history:
The first thing I noticed was the OTA tuner stopped working --about a year and a half ago (we had cable TV prior to that, so is possible that the tuner had failed earlier than that). I used an inexpensive OTA antenna to HDMI output tuner at that point for tuning in TV stations (OTA). OK for at least a year.

Then about a two months ago we noticed that on startup, we got the vertical lines and screech audio. We would restart several times, and then could watch TV throughout the day. (YES- at that point I should have intervened, but I was packed with work and vowed to address it when I had time).

A few weeks back (11/30), we started up the TV per our usual routine of multiple restarts, but that no longer worked. The vertical lines, barely a ghost image, and loud screech were persistent.

Bought a replacement Tcon and Mainboard online and replaced them just to be safe.

Went to turn on the set, and now I have only a flashing standby light on the front (no menus accessible, no apparent backlight, nothing but the flashing standby light.

The fuses all seem to have continuity, with no resistance.

The TV is the Fluo backlight (not LED).

[budm]

Re: SAMMY LN40A530P1F on the decline

Another 'A' series failure.
http://www.shopjimmy.com/catalogsear...?q=LN40A530P1F

[Penny.Jeter]

Re: SAMMY LN40A530P1F on the decline

Thanks nomore and lank.
attached images (sorry--will use a better device if needed)

[Penny.Jeter]

Re: SAMMY LN40A530P1F on the decline

Thanks budm.
Can you use any base fluo bulb? It makes me a bit nervous-- the board would handle the initial startup voltage like a ballast, right?

[budm]

Re: SAMMY LN40A530P1F on the decline

The red LED will flash then it should stop nit flashing all the time, it that what it doing?
If you go to the link at shopjimmy, you will see this:
Symptoms:
-TV turns on briefly, has no video on screen then shuts off, comes back on, shuts off, repeat.
-Takes 10 – 60 seconds to turn on, stays on for a bit and shuts off, comes back on, shuts off.
-Red power LED blinks forever, TV doesn't turn on.

Where did you get the main board from? I would not worry about the backlights right now.

[Penny.Jeter]

Re: SAMMY LN40A530P1F on the decline

Thanks budm.

The Red LED flashes all the time. I have only left it on for two minutes.

*I got the TCON as a "compatible model" via Shopjimmy.
*The main board I bought from EZK liquidators (Shopjimmy was out). It was a "tested/working" unit yanked from a TV. This was purchased due to the tuner issue anyway.

[budm]

Re: SAMMY LN40A530P1F on the decline

I just fixed my LN32A550P3FXZA that will not power on with just blinking RED LED or sometime it will make loud squeals through the speakers.
I replace the C102 (47uF 10V TONKIN NE AS7 cap) and it is working right now (it has been an hour) and I am burning in to see if that will be it.
Pictures provided by SHOPJIMMY.

[Penny.Jeter]

Re: SAMMY LN40A530P1F on the decline

I have tried combos of the new and old TCon and Main boards to no success. I have not checked the PSB outright, but I do "smell" the main board (heatsink and coax shields) warming.

There is no backlight that I can discern, and no: menus, static, or any kind of sound or screen image. The only thing I can see is a flashing standby light.

Would this indicate that the PSB is probably OK, and still problem with the main board? I bought it from an internet supplier, so I don't want to yank anything to test.

[alonecd]

Re: SAMMY LN40A530P1F on the decline

Thank's , work !!!!!!!!!!!!!!!

[Alastair E]

Re: SAMMY LN40A530P1F on the decline

Sounds like the usual Bordeaux-Plus Mainboard cap issue.....

Green lines crackling/screeching sound...

Two 1000uF 16V SM caps under the tinwork by side of the processor, plus a couple of 100uF by the PSU plug/connector on mainboard--These caps will LOOK Faultless, just change 'em.