I am looking at an old A1278 820-2530 just for practise, and I have checked resistance to GND on PP3V42_GSH at pin 2 of L6995 with coil fitted and it's 3.81K. Is this reading likely to mean a bad MCP, seeing as I have been told by a reliable source that on an 820-2879 (I realise that it's a different board but of similar vintage and general design?) a resistance to GND reading of PP3V42_G3H more than likely means a bad MCP and not to waste my time trying to go any further. It has green light on and fan spin on shorting SMC_ONOFF_L to GND and RTC_32K_XTALOUT_R is 32.76kHz. PM_PWRBTN_L pulsing on start up (3.4v -0 - 3.4v) U1000/1400 both getting warm. Thanks if anyone can offer an opinion please
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My YouTube channel - https://www.youtube.com/channel/UCiD...5d6OgizDqoi_SA -
Re: Does low RTG reading mean bad MCP
That's a good indication that it's not worth wasting time on it. It has to be measured with the board cold and all power drained from it. You can still try to go further if you have hope…
So what's the issue with it?OpenBoardView — https://github.com/OpenBoardView/OpenBoardView -
Re: Does low RTG reading mean bad MCP
Hi Piernov, thanks for the reply but I got it to boot somehow but I'll see how long that lasts
Cheers
My YouTube channel - https://www.youtube.com/channel/UCiD...5d6OgizDqoi_SAComment
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I did an hdmi port repair for a PS5 and I lost the small diode z71 SOD923 on the back of the port. I did a trace repair for pin 19 of the port as well. Without the diode I get no display at all. I tried replacing the diode twice but after I get flux on it the marking comes off so I can't tell if I have it on the right orientation. When I measure I get a reading of 1(open) and 923 in diode mode. Is 923 a normal reading for these and also which side should the reading be with regards to the arrow on the board?... -
Howdy all I have a 90uF Capacitor 200/275 VRMS and measured the ESR . Reading says 00.3 Ohms and about 1/2 a second later 00,0 and says low ESR (Really No Kidding).
I have checked it on the multimeter and reading is 94.7uF well within soec as ir has a 25% tolerance on it.
Can anyone advise me is this capacitor likely to fail in the near future or still good to use. -
Hi my board is HUSK MB 11309-248.4TU05.021
The board is plugg and consuming 13 milliamp
measuring the 3v coil no reading and the 5v coil no reading
Ive measure the pins in PU4103 ( RT8223M)
1- NO READING
2- NO READING
3- 4.4V
4-NO READING
5- NO RADING
6- NO RADING
7-3.3V
8- 5V
9-19V
10- NO RADING
11-3.3V
12- 3V
13-
14
15
16-4.4V
17-3.3V
18- NO READ
19-5V
20- NO READING
21-2V
22-2V
23-NO READING
24- 5V
... -
Hello there,
I have a issue with a tower UPS 3000XL with also an external battery tower that has almost new batteries and very little use.
A week ago it started entering boost mode because the read line voltage was below 210VAC, when it was in fact near 225 VAC.
The battery voltage was also low (48 or 49), when in fact the batteries are fully charged to 55.1 VDC.
I opened it up up, cleaned and tried a reset.
I updated lower transfer voltage to 196 with apctest and then used the serial port to adjust the configuration with a terminal in Prog mode... -
Have an A2141 which is reading about 5.2V 0.07A on all USB jacks, started doing the measurements.
PPBUS_3GH diode: measures good .45V
PPBUS_3GH Voltage: maybe not so good 12.25V maybe bad T2? Unit did not come up in DFU on configurator.
The weird so far is
PP3v3_G3H_RTC_X diode: .104V (WTF?)
PP3v3_G3H_RTC_X voltage: 3.39V (Normal)
Stopped there attempted reverse voltage injection at PP3v3_G3H_RTC_X with 1V. Instead of the circuit sinking any current, My PSU suddenly reads 3.4V with no current draw.
Not sure what any of this means...
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