Re: Samsung LA40C530F1R Backlight goes off/ 5v detect drops
Hi thanks for your input.....
I tried cleaning Main board with isopropyl alcohol and tv is on now! Weird! is this then due to flux on board?
EDE
Member
Last Activity: 02-12-2019, 12:27 AM
Joined: 02-07-2019
Location: Cape town
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Re: Samsung LA40C530F1R Backlight goes off/ 5v detect drops
Hi Budm.
I measured Pin 2 DET on main board 21.9kohm (isolted from PS Board)
and when connected Main to PS = 7.5Kohm@ pin2 DETLeave a comment:
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Re: Samsung LA40C530F1R Backlight goes off/ 5v detect drops
Hi Budm,
Ok, it makes sense. I will check today and get back to you. I actually measured the wrong board(PS).
Apologies.Leave a comment:
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Re: Samsung LA40C530F1R Backlight goes off/ 5v detect drops
I will check today and get back to you.Leave a comment:
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Re: Samsung LA40C530F1R Backlight goes off/ 5v detect drops
I will check today. And get back to you soonest.
What was strange is the TV came on for a minute then shut down again after trying to clean main board.Leave a comment:
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Re: Samsung LA40C530F1R Backlight goes off/ 5v detect drops
Hi Budm.
If for instance the resistamce is low on main board side for 5VDET will this mean its a problem on main board?Leave a comment:
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Re: Samsung LA40C530F1R Backlight goes off/ 5v detect drops
Apologies, the resistance I measured was on the PS side. I will measure the main board side today and get back to you.Leave a comment:
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Re: Samsung LA40C530F1R Backlight goes off/ 5v detect drops
Hi there.
I have measured the resistance on pin 2 and I got 11.47kohm. I need to inform you that I tried cleaning the Main board With alcohol wipes due to flux but it was difficult to remove . I howewer tried switching on tv again and guess what tv switched on for a minute and then cut out again. I would like to give the pcb a proper clean with brush and alcohol and try it again. please let me know what you thinking. much appreciated.Leave a comment:
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Re: Samsung LA40C530F1R Backlight goes off/ 5v detect drops
Ok I will check the resistance and get back to you. At work now so will check this evening and get back to you. Thanks!Leave a comment:
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Re: Samsung LA40C530F1R Backlight goes off/ 5v detect drops
Hi budm,
Thanks for the reply.....
The following I am observing........
When Main Board is disconnected from PS Board the backlights go on but as soon as I am adding main board the lights go off.
In terms of measurements when Mainboard is disconnected I do get 5.28V @ DET on PS board but as soon as I connect Main board Voltage drops to 0.02V.
Can I suspect Main board defective?
Also, H_SYNC no voltage...
I've also noticed on the...Last edited by EDE; 02-08-2019, 01:17 AM.Leave a comment:
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Re: Samsung LA40C530F1R Backlight goes off/ 5v detect drops
Hi, nomoresonys
Thanks for the response....
DET should read in the range 5V but im getting 0.02V
Is this voltage supplied by the main board and not the power board?Last edited by EDE; 02-07-2019, 06:50 AM.Leave a comment:
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Re: Samsung LA40C530F1R Backlight goes off/ 5v detect drops
Hi All.
My question is wrt LA40C530F1R. When switching power on at the power socket the standby light starts blinking 6 times then it goes off for approx 5 sec then it repeats the process every time without the display turning on. I have done the following troubleshooting:
Disconnect the main board from the supply board then I've noticed the leds are coming on.
Next I measured the voltges on CN802 and I compared my measurements with the (Gruders see the previous post) and the only difference...Leave a comment:
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