Re: Samsung LN32B460 turns on only after repeated attempts
The PSU outputs are within good tolerance. Following the troubleshooting guide, the voltages on the main board are within tolerance with the exception of BD104, which should be 12V, but tests at 13.07V. That is the only reading that is too high.
Dardo
Member
Last Activity: 04-04-2020, 12:53 PM
Joined: 08-25-2012
Location: Philadelphia, NJ
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Re: 32 samsung lcd will not turn on just blinks 5 times
I'm having the exact same problems with my LN32B460 (led blinks 5 times, back-light works when the MB is unplugged), but still haven't pinpointed the problem. Maybe this is the service manual you are looking for?
[url]http://elektrotanya.com/?q=showresult&what=ln32c450e1d&kategoria=&kat2=all[/url]Re: 32 samsung lcd will not turn on ...n't pinpointedLeave a comment:
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Re: Samsung LN32B460 turns on only after repeated attempts
I'm still trying to pinpoint the problem and I managed to get service manual for this tv. I do have a question about the troubleshooting manual, it states voltages as A, B, or DDR (e.g. A5V, B12V, DDR1.9V). I'm assuming A is for standby-mode and B for power on, but I'm not sure about DDR. Can someone give me a clue? I've included the applicable pages from the manual.
Thanks....Leave a comment:
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Re: Samsung LN32B460 turns on only after repeated attempts
Can anyone tell me what the part circled red in the pic is? Does anyone have a schematic?
Thanks...Leave a comment:
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Re: Samsung LN32B460 turns on only after repeated attempts
Thanks for everyone's help. I'm thinking it is time to find a replacement main board, which is board # BN97-03466B, and the part # is BN96-11524A.
I'm finding 3 different part #'s for that board #
BN96-11524A
BN96-11524B
BN96-11524C
Does anyone know if I can use the B or C version, or if I need to stick with the A version?Leave a comment:
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Re: Samsung LN32B460 turns on only after repeated attempts
The voltages are the same on failed startups....Leave a comment:
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Re: Samsung LN32B460 turns on only after repeated attempts
Thanks selldor and retiredcaps.
OK I checked the voltage regulators. I assume I need the readings when the screen is on, as some have power only when in standby.
IC601
1117
0944EG
pin 1 = 0.017
pin 2 = 1.264
pin 3 = 3.28
IC505
1117
0944EG
pin 1 = 0.631
pin 2 = 1.891
pin 3 = 4.75
IC109
17-33
0944DG
pin 1 = 0.017
pin 2 = 3.29
pin 3 = 5.10
...Leave a comment:
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Re: Samsung LN32B460 turns on only after repeated attempts
Thanks Tom
There are 2 stickers with part #'s
BN97-03466B
BN96-11524A 657A...Leave a comment:
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Re: Samsung LN32B460 turns on only after repeated attempts
Yes it goes to 4.7V when it succeeds, < 0.5V during unsuccessful attempts...Leave a comment:
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Re: Samsung LN32B460 turns on only after repeated attempts
Since this does not go over 2V on power up, does that indicate a main board problem?...Leave a comment:
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Re: Samsung LN32B460 turns on only after repeated attempts
Thanks, I was hoping I read those numbers right. Any other ideas?Leave a comment:
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Re: Samsung LN32B460 turns on only after repeated attempts
I tested them but I am having a hard time finding the data sheets. What I have so far...
IC105
78M098
KV 9A
8.84
0.00
13.07
IC427
119nB
17-18
0.00
1.811
3.26...Leave a comment:
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Re: Samsung LN32B460 turns on only after repeated attempts
INV ON/OFF goes to <0.5V on power on attempts, 4.7V on the one rare attempt that succeeded....Leave a comment:
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Re: Samsung LN32B460 turns on only after repeated attempts
I didn't catch the typo, but just assumed the CM804. By PS_on do you mean pin 1 on CNM802? That goes up to 1.8V on power attempts, then back down close to 0. There is another ribbon cable connected to the main board beside the one coming from the PS It disappears behind the metal shielding, but I assume it leads to the T-CON board. Disconnecting that cable has no effect on powering up....Leave a comment:
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Re: Samsung LN32B460 turns on only after repeated attempts
The 13V all get 13V when the power button is activated, the 5.3V get 5.1V.
Standby gets a constant 5.1V...Leave a comment:
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Re: Samsung LN32B460 turns on only after repeated attempts
Yes, it goes to 378V while the standby light flashes for a few seconds, then back to 162V. If plugged in when CNM802 is disconnected, the backlight comes on and it reads a constant 378V....Leave a comment:
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Re: Samsung LN32B460 turns on only after repeated attempts
Thanks Budm
I get readings on CP815 of 162VDC plugged in, 378VDC when the power button is activated.
On pin 1 of CNM802 I get 1.18VDC when the power button is activated....Leave a comment:
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Re: Samsung LN32B460 turns on only after repeated attempts
Sorry I'm a noob at repairing electronics. You mean test each pin on the connector leading to the main board I assume?
There are 3 50v 47uf caps and one 50v 22uf cap on the hot side, is the 22uf one the startup cap (CM808 on the schematic you provided)?
Thanks...Leave a comment:
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Re: Samsung LN32B460 turns on only after repeated attempts
Thanks for the replies. Now the standby light only blinks a few times after pressing power...it won't turn on after many attempts.
Tom - I get the same response using the power button or the remote.
Duncan - I have posted pics of the back of the PS and main boards. Can you point out which photocouplers and how to test or diagnose if they are the problem?...Leave a comment:
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Re: Samsung LN32B460 turns on only after repeated attempts
I tried the hair dryer with no visible difference. The problem only seems to be getting worse...it will only turn on every 10 or so attempts now. Any other suggestions what to try next?
ThanksLeave a comment:
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