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Crumbtrail TV Forums: TV Equipment: TV Repair Forum:
Samsung ue40eh5000 no stand by light

 

 


ebalcsk
New User

Aug 30, 2020, 6:21 AM

Post #1 of 5 (112 views)
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Samsung ue40eh5000 no stand by light Can't Post

Hello my grandmother Samsung ue40eh5000 is died even no stand by light. After disassembly I found one busted capacitator (CM852 47F 200v) in the power board. I replaced it but still no standby light.

- If I disconnect the main board cable from the power board the backlight is light up.
- I measured the right voltages towards a main board 12.75v , 5.2v
- The 2 VAMP kable also have 12.75v
- (I dont really know what going on the PWM line)

I think the power board is working fine.

I think the mosfets are ok in the main board I measured 3.4v 1.8v .. and not found a short
What I found towards a switch button (ir, standby light) board instead of 3.3v only has 0.4v

My question is the problem with the main board?
What would be the problem? Where should I look?
Might be better to change the complete board?


Thank you



jts1957
Veteran


Aug 31, 2020, 5:32 AM

Post #2 of 5 (101 views)
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Re: [ebalcsk] Samsung ue40eh5000 no stand by light [In reply to] Can't Post

Sounds like Main board to me.

I'm presuming that LEDs for backlight are up for as long as that cable is disconnected, NOT just for a moment.

With ALL connected normally does anything happen differently if you 'insist' (external power source / two 1.5V batteries in series) that 3.3V is present to keyboard?


-------------------------
Location: Far, Far Away


ebalcsk
New User

Aug 31, 2020, 9:16 AM

Post #3 of 5 (99 views)
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Re: [jts1957] Samsung ue40eh5000 no stand by light [In reply to] Can't Post

yes it is continuously lighting if cable disconnected.

Thank you it is a good idea. I just tryed but don't worked. The voltage went down to 1.4v


jts1957
Veteran


Aug 31, 2020, 10:42 AM

Post #4 of 5 (96 views)
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Re: [ebalcsk] Samsung ue40eh5000 no stand by light [In reply to] Can't Post

So change the Main board and call me in the morning.Wink


-------------------------
Location: Far, Far Away


ebalcsk
New User

Sep 3, 2020, 6:33 AM

Post #5 of 5 (62 views)
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Re: [jts1957] Samsung ue40eh5000 no stand by light [In reply to] Can't Post

Just an update.

My main board is arrived and the TV is working :)
Thank you for your helps!

 
 
 


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