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Thread Tools | Display Modes |
12-06-2013, 02:27 PM
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#1 |
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Member
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samsung ps42c450b1w clicking
Hi there
I have a samsung ps42c450b1w plasma tv It seems to have the clicking relay on the psu and will not turn on. The psu was changed but no luck. When the main ysus is unhooked the tv powers up but no pic When just the xsus is unhooked I get the same clicking on the power board and nothing. There are no bad caps visible. Can you help please Thx Last edited by Manddave; 12-06-2013 at 03:21 PM.. |
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12-06-2013, 04:35 PM
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#2 |
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Re: samsung ps42c450b1w clicking
Anyone help plz
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12-07-2013, 06:39 AM
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#3 |
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Re: samsung ps42c450b1w clicking
Anyone help with identifying which board is at fault as I have limited experience
thanks |
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12-07-2013, 11:32 AM
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#4 |
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EVs Rule
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Re: samsung ps42c450b1w clicking
Most likely Y-main -- can you post some pictures of it? Have you checked VS voltage?
When replacing these boards it's sometimes needed and often a good idea to replace both X- and Y-main at same time, due to how they chain together, damage on one can damage the other.
__________________
Please do not PM me with questions! Questions via PM will not be answered. Post on the forums instead! Free service manuals: http://www.toms-service-manuals.com/ -- 72 LED/LCD TVs, 5 monitors, 28 plasma TVs, and 2 AVR 6.1 amplifiers fixed! -- I repair Pioneer 9G Plasma Main Boards & KRP-M01 Media Receivers (PM me for info) 2 Pioneer KURO 9G, 12 Panasonic LCD/Plasma, 1 Sony LCD, 1 NEC Plasma, 2 Yamaha HTS, 5 Sharp LCDs, 5 Toshiba LCDs, 7 Philips Plasma/LCD, 1 Hitachi Plasma, 11 LG LCD/Plasma, 18 Samsung LED/LCD/Plasma, 1 Thomson Plasma, 1 Atec LCD, 1 Hanspree LCD, 1 Xerox LCD, 1 Harwa LCD, 2 Proview LCD, 2 Hyundai LCD, 1 "Onn" LCD, 1 Grundig LCD, 1 Dell LCD, 1 iiyama LCD, 1 Acer LED, 1 Logik LCD, 1 Baird (China) LCD, 6 Bush LCDs, 22 Vestel LCDs (Best->Worst) |
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12-07-2013, 12:36 PM
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#5 |
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Re: samsung ps42c450b1w clicking
Hi thanks for the reply
I will have chance to look at this better tomorrow and get some pics I know it's not the power board for certain Can you tell me what voltage I need to check Thanks |
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12-07-2013, 01:17 PM
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#6 |
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EVs Rule
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Re: samsung ps42c450b1w clicking
Vs is marked on the power board, it should be around 200V.
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12-08-2013, 04:35 AM
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#7 |
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Re: samsung ps42c450b1w clicking
The vs on the power board to the ysus looks ok
The vs on the ysus to the x is virtually nothing. |
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12-08-2013, 04:43 AM
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#8 |
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Re: samsung ps42c450b1w clicking
Are you sure? They are directly connected to each other.
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12-08-2013, 04:47 AM
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#9 |
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Re: samsung ps42c450b1w clicking
How do you mean?
The vs pin on the psu is showing voltage. But the vs pin on the ysus that goes to the x board shows nothing |
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12-08-2013, 05:29 AM
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#10 |
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EVs Rule
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Re: samsung ps42c450b1w clicking
From what I remember there is a direct circuit trace between the Vs in and out on the Y-main.
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12-08-2013, 07:19 AM
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#11 |
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Re: samsung ps42c450b1w clicking
Ok my bad sorry I am getting voltage to the vs but losing it on and off with clicking psu
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12-08-2013, 07:38 AM
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#12 |
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Re: samsung ps42c450b1w clicking
Here are some pics
When ysus is unhooked the tv goes into its normal start up. when its plugged in again i get 5 or 6 clicks from the psu and then nothing. |
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12-08-2013, 10:26 AM
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#13 |
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Badcaps Veteran
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Re: samsung ps42c450b1w clicking
This may be one of those Samsungs in which you can test for shorts in the components on the heat sinks and quickly find your problem boards: http://www.badcaps.net/forum/showthr...t=ns-50p650a11
Last edited by capkid; 12-08-2013 at 10:29 AM.. |
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12-13-2013, 02:23 PM
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#14 |
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Member
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Re: samsung ps42c450b1w clicking
Changed out most of the boards on this tv and still the same
Anyone any ideas please Would the buffers cause this problem? |
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12-18-2013, 11:01 AM
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#15 |
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Member
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Re: samsung ps42c450b1w clicking
Any ideas what this could be please
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12-18-2013, 12:04 PM
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#16 |
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Badcaps Veteran
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Re: samsung ps42c450b1w clicking
So You removed the P.S. plug to Yand X board and it continued to cycle on/off? Remove the connector at P.S. from the main board. Does it still cycle on/off? If yes then its the P.S. No its the Logic board. according to the Tranining Module page 46
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12-18-2013, 02:44 PM
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#17 |
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Badcaps Veteran
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Re: samsung ps42c450b1w clicking
Sounds like a logic board issue, arethee any leds lit up on the logic board when its power cycling? check tthe white rectangular ceramic fuse on the logic board to see if its open.
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12-20-2013, 01:26 AM
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#18 |
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Member
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Re: samsung ps42c450b1w clicking
Led on logic board lights up when cycling. When main ysus is unhooked it starts up and displays nothing
Also when logic board is unhooked from ps it goes through start up. If I unhook main board then it does nothing. Could I have been sold a bad psu? Can anyone tell me how to test psu Thx |
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12-20-2013, 02:03 PM
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#19 |
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Member
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Re: samsung ps42c450b1w clicking
completely disconnected the logic board from everything and the tv starts up with no picture
when the logic board is connected to ps again it starts the cycling. Everytime it clicks the led on the logic board lights up. it does this a few times and shuts off. |
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12-22-2013, 01:57 AM
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#20 |
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Member
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Re: samsung ps42c450b1w clicking
Can anyone say if this is definitely the logic board. Due to it being replaced with a 2nd hand one
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