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Re: 820-01521 only shows 5V 0.04A
What are the voltage readings of the following ?
PP1V1_UPC_XA_LDO_BMC
PP1V1_UPC_XB_LDO_BMC
only the port that is powered will enable the above LDO rail.
Do test each port side of the logic board for the above points.Comment
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Re: 820-01521 only shows 5V 0.04A
any suggestions?Comment
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Re: 820-01521 only shows 5V 0.04A
The last measurements are ok.
PPBUS_G3H = 12.26V
This reading is low. This means the SMC has not yet boosted the output to be 12v6 using the I2C lines.
On the ISL9240 chip that is supplying the ppbus_g3h, locate the I2C lines. Measure the voltage of the SCL and SDA lines.
Post your readings.Comment
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Re: 820-01521 only shows 5V 0.04A
The I2C voltage is fine.
1) Measure each AWAKE line and post the measurements.
PPVDDCPU_AWAKE
PPVDDCPUSRAM_AWAKE
PP1V2_AWAKE
PP3V3_AWAKE
and
PP0V8_SLPS2R
2) As per comments by @reassor, PP5V_G3S is created by U7650. Enable = EN1 = P5VG3S_EN_DLY.
See attached.
Check the INPUT and OUTPUT voltage of this single gate delay IC (schmitt trigger).
Post your results.
You may have a damaged T2 but first let us confirm the above rails.Attached FilesLast edited by mon2; 05-14-2022, 06:32 AM.Comment
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I read EBOOK of Testing Electronic Component and found that
"In order to test the small blue resin coated ceramic disk capacitor which has 104 50v specification,it is possible to test this small ceramic capacitor by making use of analogue meter.
Set to times 10Kohm that has 12v output from the probe to check disorder of ceramic capacitor.
It is not uncommon that testing result of digital capacitance meter is okay,But It show shorted reading when you check it with analogue meter."
Is it really possible to test small ceramic disc capacitor with analogue... -
I have had with regular AA batteries that leak this meter is expensive new I already replaced the battery battery clips once and the same thing happened again and I am tried of so it is getting modified to accommodate lithium ion batteries that are the same size excluding the positive terminal and removing the battery clips I will have enough room for the BMS protection board
I going to put 3 lithium ion battery in parallel with the BMS protection board and a way to charge the battery externally and heat shrink the battery pack and use a JST connector so I easily remove the battery... -
Hi
I want to change the scale of an analog meter, to monitor the charge of an li-ion single cell, so the needle at the end would point 4.2 volts and the 0 on the meter would point 2.5 volts or so, i tried to add diodes or a zener in series with the meter but the changes of the ambient temperature also changes the voltage value on the meter
I wonder how i can accomplish this so the meter would be precise at any temperature ?
Thnaks -
About a month ago we had a transformer jumper wire that burned in two different places between two transformers caused over $200 thousand dollars worth of damage to VFD drives at least 10 of them and a memory card and quite a few power supply as well
Now we have most of the equipment that got damaged back up and running except a feeder that has issues and we are waiting for some parts for
Now we also have another piece of equipment that was blowing fuses on the 110 volt controller switch circuit with the “E” stops and one switching power (24 volt) supply and a transformer... -
Hello, this is my first post on this forum, and my first attempted to repair a TV.
My Philips 58PUS7805/12 stopped working recently. It is not that old, about 5 years. We were on a trip for a few days and when we came back, it had stopped working out of a blue (Perhaps our house was hit by a lightning strike? Don't know.)
Read from a guide that I should test if the screen shows picture with one of the T-Con cables disconnected. Did that, it showed perfect picture (first on left, later on right side).
Read also that we should test what happens if we...
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