Samsung LA22A350C1, unable to power up

[tom66]

Re: Samsung LA22A350C1, unable to power up

What voltages do you measure on each pin, red probe on pin and black on chassis?

[vernond]

Re: Samsung LA22A350C1, unable to power up

What voltages do you measure on each pin, red probe on pin and black on chassis?

Will get the readings and post.

[vernond]

Re: Samsung LA22A350C1, unable to power up

Not really sure what the first few wordings are on the IC.

Two pins does not have a voltage as in the second edited picture.

[tw2005]

Re: Samsung LA22A350C1, unable to power up

Not really sure what the first few wordings are on the IC.

Two pins does not have a voltage as in the second edited picture.

Diodes Incorporated, AP1117 1A LOW DROPOUT POSITIVE ADJUSTABLE

[budm]

Re: Samsung LA22A350C1, unable to power up

It looks like it is a fixed regulator since I do not see the two resistors for setting the output voltage. Can you take the resistance reading between pin 1 (bottom pin as hsown in your pictures) and ground?

[tom66]

Re: Samsung LA22A350C1, unable to power up

Looks to me like adjustable type set to 1.25V by grounding the adjust pin. You can even see a 1.25V labelling.

[budm]

Re: Samsung LA22A350C1, unable to power up

Ah! I just see that 1.25V Silk screen on the board, good eyes Tom.

[vernond]

Re: Samsung LA22A350C1, unable to power up

It looks like it is a fixed regulator since I do not see the two resistors for setting the output voltage. Can you take the resistance reading between pin 1 (bottom pin as hsown in your pictures) and ground?

The resistance reading on pin 1 (top most pin as viewed in the picture) is around 1 Mega ohm.

My apologies on the earlies posting, in which the voltage reading of IC 108 is wrong. Could not access the bottom side of the mainboard properly. The correct reading on the tab of IC 108, AP1117 is 2.73 volts with respect to ground.

The voltage I'm getting at B1.25VD point is 2.73 volts. Looks like IC 108, AP1117 is faulty?

[tom66]

Re: Samsung LA22A350C1, unable to power up

2.7V (instead of 1.25V) may well have damaged something like a processor, so you might need a new board :/

[shaju]

Re: Samsung LA22A350C1, unable to power up

I do have a same problem. Everything seems OK. Still TV is not coming out of standby. Bye the way what is the conclusion/ fault found in this post

[shaju]

Re: Samsung LA22A350C1, unable to power up

Hurray................ Finaly i solved my problem.... I found a post somewhere on the net that by just heating the metal casing for the microprocessor will turn on the set, and i did the same. It worked fine. Then i opened the case and checked. Nothing found wrong. So i heated up all the component inside the casing one by one and finally got the culprit. An electrolytic capacitor of 100 mf/ 16v. Just replaced the same and everything is fine now....

[jpbtalk]

Re: Samsung LA22A350C1, unable to power up

Hi Shaju,
I do have the same problem on my TV.
There are 3 caps with value 100 mf/ 16v (close to IC 707 inside the metal casing).
can you tell which one you have replaced?

[jpbtalk]

Re: Samsung LA22A350C1, unable to power up

Hi ,
I do have the same problem on my TV.
There are 3 caps with value 100 mf/ 16v (close to IC 707 inside the metal casing).
can you tell which one you have replaced?

[budm]

Re: Samsung LA22A350C1, unable to power up

3 of them with 100 16J printed on the tops of all 3 caps.

[jpbtalk]

Re: Samsung LA22A350C1, unable to power up

Hi,
How to check the Aluminium electrolytic cap is working fine or not .
Not sure which 100 mf/ 16v cap need to be replacing.
Please guide.

[budm]

Re: Samsung LA22A350C1, unable to power up

You need to remove them then use the cap tester that can at least do the capacitance and ESR measurement, or just install the proper new caps.

[jpbtalk]

Re: Samsung LA22A350C1, unable to power up

I have installed the New caps (all three) and it is working properly.
It was very difficult for me to remove them using a normal solder iron.
Used the hor air soldering and replaced them .

When I took the Tv to authorized service center , they informed Mother board is fault and need to replaced totally. But the issue was resolved just by replacing 3 caps inside the metallic enclosure for LA22A350C1 (in few $5).
Thanks for the post.

[budm]

Re: Samsung LA22A350C1, unable to power up

Thanks for the follow-up.

[rafiemh]

Re: Samsung LA22A350C1, unable to power up

Hi.. Anyone here still have this TV model or just really clear picture of the mainboard? I need ic6004 number on the top of mainboard, I think the repairmen that try to fix my TV just remove that ic and not replacing with the new one, now I don't know what model number for that ic any help would be appreciated

[budm]

Re: Samsung LA22A350C1, unable to power up

Service manual:


This file is downloadable free of charge: ...processing... just wait until 'GET MANUAL' comes up to allow you to download the file.