Re: Samsung LN40B530p7 sound ok picture inop
Thanks Reecey, goog info
MLOO55
Member
Last Activity: 02-08-2016, 02:49 AM
Joined: 01-28-2016
Location: Lima
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Re: Samsung LN40B530p7 sound ok picture inop
John,
I disassembled the tv to reach the lamps, followed your instructions and found some of the lamps are worn out so I will buy them to replace . They are 35.5 inches long. Again thanks.
mloo55Leave a comment:
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Re: Samsung LN40B530p7 sound ok picture inop
John, it means i have to remove the black bezzel which in the front so i can reach the lamps by this side no from he back,is correcta?
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Re: Samsung LN40B530p7 sound ok picture inop
I need your help for this task, how to reach the lámps? I removed the back cover and found the two boards so can you letra me Know what is the next Step or Steps.
Rgds
Mloo55Leave a comment:
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Re: troubleshooting TV SMPS sequence
Un short, the proble sm arises un los voltage at the output,really, as I can read even withouth load so the problem should be un the hoy si de por the feedback, I think so. It would be good idea to check the voltage at the ic un spite the voltage at the main capa are ok.Mayor the resistir change its value.
Rgds
Mloo55Leave a comment:
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Re: Samsung LN40B530p7 sound ok picture inop
I checked all inverter transformer and no signos of spots por something like it, all hace the same resistance readings.
The voltage at the on/off inverter pin is the same all the time as the tv is connected to the outlet.
I resoldered several points but the problem continúe. By the way, I have not replaced any ñamp until this momento mayor you indicate the steps to reach the lamps forma this tv.
Thanks
Mloo55Leave a comment:
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Re: troubleshooting TV SMPS sequence
Have you checked the optocoupler IC4 and the IC LD7550, is this ic getting the
rigth voltage on the vcc pin. If you get at the main capacitor less than 380v
the output voltage will be not the rigth. By the way, the 5vsb value is normal?
Check and advise
rgds
mloo55Leave a comment:
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Re: Samsung LN40B530p7 sound ok picture inop
Here are the name of each pin and voltage with tv on and effectively the board is BN44-0264B.
1 3.17 ON/OFF
2 2.59 H_sync
3 5.2 5VSB
4,5,6 0 GND
7,8 13 13V
9,10,11,12 0 GND
13,14,15,16 5.2 5.3V
17,18 0 GND
19 13 13V(MAIN)
20 0 GND
21,22...Leave a comment:
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Re: Samsung LN40B530p7 sound ok picture inop
Copying again the reading of voltages at connector CN801:
1 3.17
2 2.59
3 5.2
4,5,6 0
7,8 13
9,10,11,12 0
13,14,15,16 5.2
17,18 0
19 13
20 0
21,22 13
23 4.46
24 0
25 3.34
26,27,28,29,30 0
At pin 27 DET_5v voltage is 0 v? is correct
thanks
mloo55Leave a comment:
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Samsung LN40B530p7 sound ok picture inop
I Have a problem with this tv, it happens that when I turn on the picture is normal but after 10 sec it turns black but sound or other functions work fine.
I checked all caps with an esr tester and a cap tester so no cap damage was found.
The voltage at the two main filter are:
tv on 380 volts tv off 290 volts.
Checked for any other component damaged ,resistors,diodes,mosfet and at first sight found none.
As you can see in the picture where the connector is I took the voltages when the tv is on is as follow:
1 3.17 v 16 5.22 v
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Re: New Members - please post your introductions here
Hi everyboby, well I think of I found a forum with a very clear rules, cross knowldege and expertise with all the members about the problems we found in our job. Thanks for accepting me and I hope to help you. rgds
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