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Re: BenQ W1070 Projector 5v rail
There does seem to be a dozen caps on the TVDD_3.3V line and 5 on the CVDD_1.8V line, You can use a 1.5 volt battery and with ground connected, touch the positive from the battery to the shorted line (only for a second at a time) while keeping a finger on the suspected cap, If the ic is shorted it should get hot also.
1.5 volts is below the 1.8 or the 3.3 the circuit would normally see, so the voltage won't harm the ic.Comment
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Re: BenQ W1070 Projector 5v rail
U29 is an ADV7612 (HDMI Receiver), when i remove U29 the shorts are gone and the voltage coming from the two regulators is good. I'm going to order a new one and hope for the best. Thanks for all your answers it was really helpful !Comment
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Re: BenQ W1070 Projector 5v rail
I've received the ยตc and everything is working fine ! Thanks everyone !Comment
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Re: BenQ W1070 Projector 5v rail
Thank you for following up on the repair. Good to here you have it working.Comment
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Hi, I'm Daniel, and I'm new to the world of repairing motherboards.
I would like to create a table, or more likely a guideline about the voltage rails and their possible resistance rail.
I know that the motherboard design has a very big depend on the rail's resistance, but I would like to know what is the smallest value for a rail that can be acceptable. For example, I heard that some new gaming motherboards can have 0,5 Ohm resistance on the GPU rail, but on an older type, it could be a sign of a shorted GPU rail.
So, I generated a table with AI so I can... -
Hello everyone,
I'm trying to repair my old Acer Nitro 5 (AN517-54-55T5). I've already bought a new laptop, so this is more of a learning project. For the experience, with no high expectations of success.
Well, my decice specs are the following:
Model: Acer Nitro 5 AN517-54-55T5
CPU: Intel Core i5-11400H
GPU: NVIDIA GeForce GTX 1650
Motherboard: GH51G LA-L181P Rev:1c
The symptom:
When pressing the power button, the power LED lights up for about 5 seconds and then turns off. Initially, the issue was intermittent: sometimes...05-26-2025, 10:49 AM -
This specification for the Lenovo ThinkPad P51s + ThinkPad Stack Mobile Projector Mobile workstation can be useful for upgrading or repairing a laptop that is not working. As a community we are working through our specifications to add valuable data like the P51s + ThinkPad Stack Mobile Projector boardview and P51s + ThinkPad Stack Mobile Projector schematic. Our users have donated over 1 million documents which are being added to the site. This page will be updated soon with additional information. Alternatively you can request additional help from our users directly on the relevant badcaps forum....09-06-2024, 06:11 AM
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Hello Everyone,
Long story short, I got this unit for very cheap.
I've started to experiment with it's BIOS, as I did before successfully with an M900. However my very bad quality SOIC clip broken while dumping of the biosof and it must have damaged something on the panel, because it does not turn on, and does exactly nothing when powered. The maximum voltage that could have affected something is the 3.3 or 5v from the IC clip, because the unit was not powered while the bios dumping was in progress.
I've performed some measurements:
- 20V rail perfectly... -
I have got this projector for free.
The only symptom, that I can see is, when I plug in the AC cord, the power button starts blinking like every two seconds, continuously.
Power, Lamp and Temp LEDs do not turn on.
Previous owner thinks, that is a bad transformer. I'm not convinced about that.
I have took it apart, inspected the power supply and ballast driver and did not see anything obviously bad.
At elektrotanya, is available the SM(schematics):
elektrotanya.com/benq_w1070_w1080st_ver.00a_level3.pdf/download.html
Here it is, the level 2 SM:...
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