I tread to start it from outside 20V power supply without success.
I have VCC 16.7V that is not enough to start....
AlexVG
Senior Member
Last Activity: 04-23-2025, 09:42 AM
Joined: 04-15-2022
Location: JAVEA
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Hi.
I tread to start it from outside 20V power supply without success.
I have VCC 16.7V that is not enough to start.... -
Thank youLeave a comment:
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LG55NANO806 PSU EAX68248011(1.9) identify PWM controller MDP16R
Hi everybody.
I have TV LG55NANO806 with faulty PSU EAX68248011(1.9)
EAY65169911
PLDK-L812A
3PCR02458A.
Missing standby voltage 13V
PWM controller MDP16R
It's marked on the body.
But I can't find datasheet or identify PWM chip
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Maybe somebody came across with this PSU, would you help me.
Thank you.Hi everybody.
I have TV LG55NANO806 with... -
CLK_PCI_LPC - pulsations is missing
But all these signals have 3.3v pull up....Last edited by AlexVG; 03-31-2025, 04:47 AM.Leave a comment:
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HP TPN-Q195 7265NGW main G3BA N17P not start
Hi everybody,
I come across with this main.
It starts and switch off with the button.
It has all voltages risen. PLT_RST is UP.
However, the LPC bus is risen but hasn't any exchange there (Hasn't any POS code).
I removed CODEC, but it doesn't help.
I haven't boardview and scheme for this board, only for G37.
I have not any ideas. Probably HUB issue?
Would you help me please.
Thank you.Last edited by AlexVG; 03-30-2025, 06:51 PM. -
PM...Leave a comment:
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JBL PARTYBOX 1000 NO sound NO 50V
Hi, I would like to share my experience...
So, I came across with common problem - no 50V on PSU 40-PF0750-PWD1G
L6566B was burned. Between pin 7 and GND were short circuit. I replaced L6566B with a new one, but it gave me nothing. However, it started if I touched pin 16 with multimeter probe. Obviously the protection is triggered.
If we look at the L6566B datasheet, we will see that to deactivate the protection (AC_OK), is enough to exceed 0.450 volts.
In my case, I have had 0.632 volts. This is enough at the first glance. But on the oscillogram on pin 16, I observed noise...Last edited by AlexVG; 03-11-2025, 07:06 PM. -
I am sure you know it, but I found out this article very useful.
[url]https://logi.wiki/index.php/Backlight_Troubleshooting[/url]https://I am sure you know it, but I...shooting[/url]Leave a comment:
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Hi, Montwo.
It were problem in missing BKLT_SCL, and BKLT_SDA going from U8549
I have managed to solve it.
It's a very interesting A2289 model.
Looks like the A1708, but without connected J5100 and J5110 it's not available to start the screen.
It makes this board complicated to check.
Thank you.Leave a comment:
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Hi Montwo.
So sorry for the yesterday.
Yes, I have replaced Q8400
And checked R8402
Moreover I tested U8400 in diod test mode and compare with another board.
What do you mean "the backlight pin does pull to 0v" ?
Where?Leave a comment:
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I am really stuck.
I replaced U8400 and Q8400.
I got [B]EDP_BKLT_EN[/B] signal from processor.
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Q8400 gets voltage drop on resistor R8402, However, voltage on gate of Q8400 does not change (always 12.6V). This voltage should drop to 5V, but it does not.
Please help meI am really stuck.
I replaced U8400 and Q8400.
I got [B]EDP_BKLT_EN[/B] signal from processor.
[ATTACH=JSON]{"data-align":"none","data-size":"thumb","data-attachmentid":3577286}[/ATTACH]...Leave a comment:
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I meant that I tested it without connected all connectors. Only power supply.
Keyboard light presents if the main is in the chassis with all connections.
I checked [B]EDP_BKLT_EN[/B] on the table. I did't know that it need lid open signal.
I am waiting for new 48B1A04. Hope that it is a problem.I meant that I tested it without connected all connectors. Only power supply.
Keyboard light presents if the main is in the chassis with all connections.
I checked [B]EDP_BKLT_EN[/B] on the table. I did't know that it need lid open signal.
I am waitingLeave a comment:
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I guess I have good luck! It doesn't work!
(I connected enable signal to 3.3V)
It most likely means that I have U8400 problem.
It's not a big problem.
I have ordered it and waiting for delivery.Last edited by AlexVG; 02-14-2025, 06:27 PM.Leave a comment:
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Thank you.
Yes, I thought about it.
Will try tomorrow.
It would be good luck if only U8400 damaged.Last edited by AlexVG; 02-13-2025, 08:10 PM.Leave a comment:
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Yes.
But keyboard lights is present (so as it were before)Last edited by AlexVG; 02-13-2025, 07:30 PM.Leave a comment:
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Hi Mon2.
Really thank you for your help.
Recently I have checked Lid lines.
I am sure that LID_ OPEN_RIGHT and LID_ OPEN_LEFT have reaction (Hi) (I checked them on U6650)
Moreover, machine starts when I open the lid.
But it's quite complicated to check IPD_LID_OPEN on U4802
and on U8400 with all connectors connected because they are on a back side of the main.
___________________________________
I Have managed to check IPD_LID_OPEN. Not directly, but throw J5100 connector.
IPD_LID_OPEN is present.
And now to check [B]EDP_BKLT_EN[/B]...Last edited by AlexVG; 02-13-2025, 07:26 PM.Leave a comment:
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Macbook A2289 820-01987A no backlight
Hi everybody,
I have Macbook A2289 820-01987A.
It have had 1.8V short circuit problem that I fixed.
But after 20 minutes working the backlight went out.
I found out missing of [B]EDP_BKLT_EN[/B] going to [B]U8400[/B] from U0500.
Ground down level goes from U0500. (I tread to remove R8442).
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The machine starts perfect. I can watch image on the screen with a flashlight, and it works with the external screen.
Do... -
Hi.
I have absolutely the same problem on
A1893 and A 2179 boards
Have somebody managed to solve that?
Thank you....Leave a comment:
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Sorry, this link shows me 404 error......Leave a comment:
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