Re: 820-4924-A Missing PM_SLP_S4_L
nevermind, 0.6ohm short on vcore, cpu toast
powerblackout
Senior Member
Last Activity: 06-05-2023, 10:09 PM
Joined: 02-25-2018
Location: Indianapolis
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820-4924-A Missing PM_SLP_S4_L
mystery board no history!
no corrosion or liquid damage anywhere.
green light on charger, 24ma power draw.
PM_SLP_S5_L 0,0v pulses on SMC_ONOFF_L
PM_SLP_S4_L 0.0v pulses on SMC_ONOFF_L
PM_SLP_S3_L 0.0v pulses on SMC_ONOFF_L
PM_SLP_S0_L 0.0v pulses on SMC_ONOFF_L
PM_SYSRST_L 0.016v no pulse on SMC_ONOFF_L
PM_S0_PGOOD 0.00v pulses on SMC_ONOFF_L
SYS_PWROK pulses on SMC_ONOFF_L
PPBUS_G3H 12.67v
PP3V3_S5 3.3v
PP3v3_S4 0.0v
pch_intruder_l 3.3v
PM_RSMRST_L 3.3v
PPVRTC_G3H 3.34v
RTC_RESET_L...Last edited by powerblackout; 01-07-2023, 11:38 PM. -
Re: 820-00923-A No left side USB activity
I reballed UB300 and UB400 and now 5V is being generated and USB devices work on both sides now!
I think this would be worth adding to the repair wiki? even if UB300/400 can get up to 20V, boot, and charge battery, there could still be something shorting the 5V enable line coming from UB300/400 going to UB700?
Thank you for your help mon2!Leave a comment:
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Re: 820-00923-A No left side USB activity
After looking at the schematic more I found the line that turns on the 5V when a usb device is plugged in, [b]UPC_T_5V_EN[/b] which has a 0.5ohm short to ground. Checked [b]UPC_X_5V_EN[/b] which has 11K resistance.
EDIT: removed UB700 and the 0.5ohm short remains, meaning UB300 or UB400. Inject voltage to figure out which CD3215 has the short? 1V do the trick?Re: 820-00923-A No left side USB activity
After looking at the schematic more I found the line that turns on the 5V when a usb device is plugged in, [b]UPC_T_5V_EN[/b]Last edited by powerblackout; 01-03-2023, 07:58 AM.Leave a comment:
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Re: 820-00923-A No left side USB activity
the readings from both sides of the board (2 working right side 2 non working left side) all match.
D+/- are 0L on all four ports (including the ones that work)
Everything else is 0L except for these:
VBUS 0.173
CC1 0.593
CC2 0,593
RX2- 0.350
RX2+0.350
RX1- 0.350
RX1+ 0.350Leave a comment:
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Re: 820-00923-A No left side USB activity
Finally got the password and was able to reset machine back to factory. after SMC reset the touch bar started working again.
When looking in the system information panel for USB it only lists one of the hubs. Any ideas?Leave a comment:
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820-00923-A No left side USB activity
Board couldn't boot due to corrosion under UB090, stuck at 5v 20-30mah. After cleaning that up the board boots and charges, 20V on all 4 TB ports.
Trackpad and keyboard currently don't work due to a failed battery swap that left gouges in the trackpad board exposing traces. Touch bar doesn't work either, haven't started troubleshooting that.
USB devices aren't detected on the JB500 connector. any orientation, either of the ports. Tried known working flex connector. When using an ammeter I see no power flowing out to the USB device, when connected to J3300 5V 200mah goes...Last edited by powerblackout; 01-01-2023, 11:45 PM. -
Re: Sony Bravia XBR-65X850B Clicking On and Off
I have been very careful with all of the TCON ribbons, here are some pictures.
When the bottom left jumper is connected the board has the original symptoms. this was happening before i even opened the tv.
I pulled all of the ribbons out and wiped them down with IPA and a q tip incase there was any dirt on them....Leave a comment:
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Re: Sony Bravia XBR-65X850B Clicking On and Off
Along the bottom and the top of the panel are little tcon ribbon "jumpers". I removed the bottom left one and the TV started turning on with an actual image. Does this look like something that can be repaired?...Leave a comment:
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Re: Sony Bravia XBR-65X850B Clicking On and Off
I found the update process for this tv on another forum: [url]https://www.avsforum.com/threads/official-2014-sony-xbr-49x850b-xbr-55x850b-xbr-65x850b-xbr-70x850b-thread.1530461/page-194#post-33225713[/url]
after following those steps and getting the replacement TCON board firmware updated, the same problem happens with both now, clicking on and off no display.Re: Sony Bravia XBR-65X850B Clicking...33225713[/url]Leave a comment:
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Re: Sony Bravia XBR-65X850B Clicking On and Off
When I have any number of ribbons connected it will also randomly click off then back on again, sometimes a few seconds apart sometimes a minute or so.
There is a high pitch whine coming from the TCON board I picked up on video [url]https://www.youtube.com/watch?v=PKkUfh0ThV4[/url]
I went ahead and did this same process for the replacement TCON board. when I only connect a single ribbon the status LED flashes yellow/green meaning it wants a firmware update, but Sony's website doesn't have it anymore..Re: Sony...Last edited by powerblackout; 11-27-2022, 10:26 PM.Leave a comment:
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Re: Sony Bravia XBR-65X850B Clicking On and Off
Here is the top right and bottom left connected. I can hear a rapid clicking sound coming from the TCON board, possibly from one of the ICs....Leave a comment:
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Re: Sony Bravia XBR-65X850B Clicking On and Off
The TCON board has 4 ribbon cables that go to the panel, 2 up and 2 down.
When I only plug one ribbon in with everything else stock the TV comes on and the back light comes on. Here it what it looks like with only the top left ribbon connected.
I started adding in more ribbons one at a time, after I get to 3 ribbons connected it starts restarting and clicking like originally....Last edited by powerblackout; 11-27-2022, 09:42 PM.Leave a comment:
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Sony Bravia XBR-65X850B Clicking On and Off
XBR-65X850B tv clicks on and off constantly after power is applied, the status LED turns on white like normal, getting brighter, but then the power supply clicks and the status LED goes off.
[B]POWER_ON[/B] 3.3V constant
[B]T-CON_ON[/B] 0V until the "off" click where it blips up to 3V then back to 0V
[B]REG12V[/B] is 12.6V until the "off" click, drops to 0V
[B]T-CON_VCC12V[/B] is 0V until the "off" click, where it looks like the voltage goes up, my meter tries to get a reading but it goes back to 0V too soon.
I unplugged...Last edited by powerblackout; 11-27-2022, 08:46 PM. -
A2251 touch bar causing system crashes
I have an A2251 with a touch bar that doesn't always show up under the system info window. Randomly after an SMC reset it will be detected and the screen will look like the attachment. After booting into a fresh install of Ventura the system will lock up, the fans will go to 100% for half a second, and the system turns off.
The board looks pristine, I think the problem is with the touchbar itself because the system info window picks up the other usb devices like the trackpad, camera, and ambient light sensor.
Does the [URL="https://www.ebay.com/itm/175306957254"]AMS910-WM04-0[/URL]... -
Re: Ipad mini 2 boardview plz
does anyone have a version of this that isn't .pcb extension?Leave a comment:
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Re: 820-00840 20v 0a
I measured at U8205 pin 13/14. I have a donor board that has several 10k ohm resistance in the same spot.
The SDL/SDA lines aren't "cycling", just pulsing up and down half a volt.
PPBUS_G3H is steady 13V, no cycling.Leave a comment:
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Re: 820-00840 20v 0a
0.421 Diode for both
3.418V for both, pulsing about every second.Leave a comment:
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820-00840 20v 0a
suddenly stopped turning on. no corrosion at all board seems in great shape. ammeter sits at 20V 0A.
PPBUS_G3H - 13.0V
PP5V_S5 - 4.99V
PP3V3_S5 - 3.3V
PP5V_S4 - 0V no shorts
SMC_PM_G2_EN - 3.4V
PP3V1_RTC - 3.1V
PM_DSW_PWRGD - 3.4V
PCH_INTRUDER_L - 2.84V
PCH_SRTCRST_L - 3.1V
PPDCPRTC_PCH - 1.14V
PM_SLP_S5_L - 0V
PM_SLP_S4_L - 0V
Any ideas on where to start? This seems like the PCH is dead or not getting power?
more measurements:
PM_EN_P3V3S5G - 3.3V
PP3V3_S5G...Last edited by powerblackout; 03-18-2022, 09:47 PM. -
Re: 820-2915-A 1 beep
Any ideas? I can't find any information on how to troubleshoot SMBUS issues for this board.Leave a comment:
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