Re: Samsung LCD TV Power Supply BN44-00438B
Just thought of the possibility of using a separate power supply to power the backlights?
liomendonca
Member
Last Activity: 12-31-2014, 07:15 AM
Joined: 10-30-2014
Location: Port of Spain, WI
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Re: Samsung LCD TV Power Supply BN44-00438B
OK I am now stuck as I have been bitten by the "repair" bug. In my younger days I built I think every Heathkit so now nostalgia has set in. But I must be able to find the schematic for the BN4400438B. Is the BN4400438A similar? Any schematic for that?Leave a comment:
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Re: Samsung LCD TV Power Supply BN44-00438B
OK so at this stage should I order the power supply or is it likely that I can repair it with my limited knowledge A quick question. Why do guys like you spend all this time and effort to help people
Do you gain anything besides satisfaction?
If we stop here then thamks againLeave a comment:
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Re: Samsung LCD TV Power Supply BN44-00438B
ok I have gone back and checked the PS_ON and it seems to be Ok
TV off LED ON PS_ON is 3.5v
TV on LED OFF PS_ON is 0 V
Capacitor stays at 160v with TV on or off
As long as 110 plugged in capacitor 160V
Maybe after a few hours it should discharge to zero even with 110 plugged in?
You said if PS_ON is OK then it is definitely Power Supply
Still need photos?
If you do hope my photography is up to mark
Thanks againLeave a comment:
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Re: Samsung LCD TV Power Supply BN44-00438B
Allout means CN801 and CN802 not plugged inLeave a comment:
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Re: Samsung LCD TV Power Supply BN44-00438B
to budm I cannot get over the quick replies to my problems. I really just needed to know if it was definitely the power board to replace (bn4400438b) but if you think it can be repaired well hurrah. The TV is a 32 in LCD Samsung LN32D430GLeave a comment:
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Re: Samsung LCD TV Power Supply BN44-00438B
Sorry when I transferred numbers no longer aligned
Thanks for your prompt reply
Will check voltages with tv on and tb off
Is that what is neededLeave a comment:
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Re: Samsung LCD TV Power Supply BN44-00438B
allin no802 no801 ALLOut
1 B13V 13 13 13 13.1
2 P_DIM 2 5 2.1 5.1
3 B13V 13 13 13 13.1
4 NC NC NC NC NC
5 B13V 13 13 13 13.1
6 BLU_ON 5.2 1.3 5.1 1.3
7 B13V 13 13 13 13.1
8,10 9 GND 0 0 0 0
11,13 B5V 5.1 5 5.2 5.2
12 A5V 5.1 5 5.2 5.2
14 PS_ON 3.5 3.2 3.5 3.2Leave a comment:
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Re: Samsung LCD TV Power Supply BN44-00438B
Decided to post voltages to facilitate help with connectors in and out
These are the voltages at the power supply read at CN801
ALL IN CN802out CN801out ALL OUT
HIGH FET 0 0 0 0
LOW FET 0 0 0 0
OVP 0 0 0 0
CNT_PRT 13v 13v 0 0
VCC 13v 13v 13v 13v
LD 11.6v 11.6v 0 0
voltage at big cap 160vdcLeave a comment:
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Re: Samsung LCD TV Power Supply BN44-00438B
i want to order a new power supply but first must ensure that it is indeed the power supply has failed
Symptons no back light tv working fine (via flash light)
cn801 voltages
HIGH FET 0
LOW FET 0
OVP 0
CNT_PRT 13V
LD 11.6V
VOLTAGE AT BIG CAP 160DC?V
I have voltages at both CN802 and CN801
available with CN801 or CN802 connected or not
if necessary
What can I do to make sure it is Powe supplyLeave a comment:
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