Based on circuit diagram you provided
Measure at R13 R14, at the leads connected to charge IC pin 19 & 20, resistance value is 20Ohm
In addition, I found the small capacitor C11, connected R13 R14, when measure in continuity mode, it is shorted....
StefanNg
Member
Last Activity: 07-13-2026, 11:09 PM
Joined: 10-28-2022
Location: Kuala Lumpur
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The battery on low voltage 0.027v.
Every 10sec, voltage drop to 0.010v, the go back 0.027v.
Repeat again and again, like a heartbeat.
Total 8 pins, start from the black wire connect pin.
P- : 0Ohm
P- : 0Ohm
R : 150.7kOhm
D : 81.3 kOhm
C : 81.3kOhm
no connect : OL
P+ : Ignore
P+ : Ignore
All individual battery cell is at 4.0V. Battery fuse D6SC3, Pin 1 at 12.0v...Leave a comment:
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I didn't measure at charge IC, I measure it at socket connector.
Black meter leads to GND on motherboard.
Red meter leads to battery's red wire pin/male connector pin as shown in photo....Leave a comment:
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yes, it does looks like the same motherboard.
The charger IC is BQ24780S
I redo the measurements
with power adapter, without battery
- voltage - 8.39v (starting voltage, it maintain this level for 30sec)
- voltage - 0.25v (after 30sec, it drop to this level)
with power adapter, with battery
- voltage - 8.39v (starting voltage, it maintain this level for 3sec)
- voltage - 0.86v (after 3sec, it drop to this level)...Leave a comment:
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Battery rating is 11.52v
without power adapter
- voltage 0.006v
with power adapter
- voltage - 8.39v (starting voltage, it maintain this level for 30sec)
- voltage - 0.25v (after 30sec, it drop to this level)Leave a comment:
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Asus K513EA, Laptop Battery not Supplying Power
Hi, to all Badcaps member.
I run into a problem with my Asus K513E laptop and need help.
I found the charging LED flashing amber during charging my laptop.
Since then, it failed to start on battery mode.
Battery still detected in BIOS, 100% charge. I teardown the battery and measured each cells, all showing 4.0V
Done a hard reset by remove battery, press and hold power button 30 sec, but no luck.
I am not sure it is a soft bricked or the battery BMS is having issue.
I don't have a spare battery to verify.
I check the fuse, I get 0.43kOhm, maybe it... -
Tape the left flat ribbon. You either have to identify which pins are the clock signal or you do it trial and error.
But it might not last long if the right side also become short.
My last panel fixed only lasted for 2 months. It is luck to have it fixed.Leave a comment:
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Updates
The U-ribbon supply clock signal from right panel board to the left panel board. I am able to get a full image after block clock signal using tape (STV, CKVs, VSS, LCs)
However, full image I get has some visible horizontal line, caused by some line is dimmer, refer photo.
Turning on the monitor, I measure CKV of the good side compared to the faulty side.
CKV voltage of the good side is stable at 8.2v, while the faulty side voltage is fluctuating from -0.5v to 2.5v (each line varies)
Is there any suggestions can improve image quality?...Leave a comment:
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sam_sam_sam
Thank you for your valuable suggestions.
I sent them inquiry once but nothing reply back.
I will try again....Leave a comment:
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Looking for datasheet or help to identify component CRE2032A
Hello.
I tried to Google this component CRE2032A, but couldn't find one, no datasheet, no stock even in alibaba.
The company making this power chip still exist and making product e.g. CRE6511.
The chip is toasted and I wish to get a compatible replacement. -
Viewsonic VX2718-PC-mhd SG2701B01-8
Hi, Badcaps.
I am troubleshooting a monitor
Viewsonic VX2718-PC-mhd.
Panel model SG2701BSG2701-8
Symptoms is no image.
This panel has 2 panel board connected by a U-ribbon.
When I disconnected the ribbon, I get a perfect half screen image.
I took some test point voltage, when ribbon disconnected.
HVAA 8.38v
FVDD12 1.21v
FDD33 3.3v
VIN 11.79v
VAA 16.85v
VGHF 30.16v
VGL -8.02v
CK1_I ~ CK8_I 1.403v
CK1_L ~ CK8_L 8.26v
When I connect both panel board
HVAA, VGHF, and CKx_L... -
Re: Asus X554L No Power
Hi @mon2
Reading is 470
Marking is BQ735. I make a search, it is Texas Instruments bq24735 Li+ Battery SMBus Charge Controller....Leave a comment:
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Re: Asus X554L No Power
I watch some asus main board repair video. Is PL8801 part of the battery charging circuit? If yes, then 3.19v seems to be too low, it need to be around 12v.
IC PU8101 +3VAO is connected somewhere near to IC PU8800, which may work together with PL8801? Or could it be some problem near to EC U3001? Is there a way to further checking?
I still haven't find the way out yet. Hmm..... any suggestion?Last edited by StefanNg; 11-13-2022, 07:06 PM.Leave a comment:
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Re: Asus X554L No Power
Hi @mon2
I follow your instruction
PL8003 60.4 Ohm
PL8501 6.2 Ohm
PL8502 6.2 Ohm
PL85xx is located close to GPU U7001, PL8003 is located close to processor U0301Leave a comment:
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Re: Asus X554L No Power
I temporary patch up PSL8104, connect adapter and took big coil voltage measurement on the main board
PL8003 0v
PL8101 5v
PL8102 3.32v
PL8201 1.09v
PL8301 1.37v
PL8501 0v
PL8502 0v
PL8801 3.19v
Compare to boardview information, I feel this result looks normal. Hmm..... what else I can check further?🤔Leave a comment:
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Re: Asus X554L No Power
I check on this section previously, I will re-check it again tonight. In previous measurement Pin#4 is +24.3v, Pin#1 is +19.5v. Source voltage is present for both mosfet, +19.5v. Is this measurement sounds OK? Gate voltage is slightly lower but Drain voltage is present.
Just an additional thought. Both mosfet is interconnected for Pin#1 and Pin#4. With power adapter connected, only PQ8801 is check in this measurement?Leave a comment:
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Re: Asus X554L No Power
Please correct me if any point I get it wrong.
I assume dcin mosfet means PQ8801 and PQ8802
The mosfet marking is M0930M, I could not find datasheet, so I don't know which type of mosfet I have. I test it on diode mode, roughly guess where to contact the +ve and -ve probe. I took pin1 as drain, D
______________PQ8801 PQ8802
S(-) and D(+) 16MOhm 16MOhm
S(-) and G(+) 1136kOhm 1030kOhm
G(-) and D(+) 16.5MOhm 16.5MOhm
I have no idea what I am looking at
Leave a comment:
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Re: Asus X554L No Power
Should I say the rail is powering ON? It receive +3V from PU8101, but the rail voltage dropped to around +2V, there is continuity on it. Because of the voltage drop, power switch is not functioning.
The +3VA is connected to few parts. I need to find a way to narrow down....
Is this main board still worth a try?
Leave a comment:
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Re: Asus X554L No Power
I watched few voltage injection video. Voltage is inject from the point shorted to ground, current injected will flow thru shorted caps, then heat up the bad cap.
In my case, PSL8104 pin2 is not shorted to ground, resistance is 90kOhm. Is it safe to do voltage injection? If not safe, what should I check next?
Thank you.Leave a comment:
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Re: Asus X554L No Power
Hi, mcplslg123
I manage to cut open PSL8104. First time do on a multi layer PCB, so I did it slowly.
+3VAO is now +3.3V, +5VAO 0V (+4.9V if I short the gap I cut on PSL8104), the IC is good. Maybe is a bad news for me because now I need further deal with the whole +3VA rail.
The only safe way to do voltage inject is using a bench top power supply? I don't have it and I will need to learn the correct way to use. While I source for a suitable power supply, I am welcome any suggestions on alternative way to repair the main...Last edited by StefanNg; 11-06-2022, 08:19 PM.Leave a comment:
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