2.LED does not blink at all at the time of a power supply injection. Eject-SW does not react.

(1) Is it normal to the exterior Bus (Data-Bus, Address-Bus, control signal system) of MPU? Viewing — check: -- a short circuit, opening, etc.

•The device connected to the exterior Bus of MPU in DSP, and its signal list

Peripheral device

Flash -ROM

[Bus/Signal]

(IC302)

 

 

Address

A1~A20

 

 

Data

D0~D15

 

 

CS*

CS0B

 

 

WCK

WR

 

 

RCK

RD

 

 

=> It repairs, when abnormalities are discovered.

(2) Does the power supply circuit operate normally?

External input 12V, external input 5V, regulator 3.3V, regulator 2.8V, and regulator 1.5V

=>When the abnormalities are discovered, an external power supply, a power supply cable, and Regulator IC are exchanged.

=> Since a problem is in a load side when not improving, even if it exchanges the above, and attached sheet JR6 power-supply system figure is made reference, and poor portions, such as a short circuit of a power supply part, are found out and fixed.

(3) Is the clock of MPU in DSP oscillated correctly?

Checked the ceramic oscillation element’s X301 both-ends and DSP(106)(107) 33.87MHz oscillating.

=> When 3.3V power supply is correctly supplied to DSP and the clock is not oscillating correctly, it is the defect of MPU, or an oscillation element defect, and part exchange is performed in order of DSP and X301.

(4) The defect of Flash-ROM

Although the clock of DSP is oscillating correctly and the power supply circuit is also outputting normal voltage, when LED does not blink at all at the time of a power supply injection and Eject-SW does not react, either, poor Flash-ROM is the most doubtful.

=> Flash-ROM (IC302) are exchanged.

Note: Before Flash-ROM exchange, the CS signals of the external device of MPU in DSP connection, an Address signal, and a Data signal are observed on a waveform level, and since the but most amount of work and the special knowledge which can raise the discovery accuracy of a poor part are necessities, recommendation is impossible.

(5)Even if it performs the above-mentioned repair, when not improving, the disconnection and the short circuit which cannot be discovered, can be considered in viewing of PCB. Moreover, partial breakage (although a clock is oscillated, somewhere in insides do not operate.) of DSP can be considered.

=> When not improving above, the possibility that a PCB pattern is faulty is high, and judges repair to be difficult.

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LG Electronics GSA-4168B, GSA-4165B CS0B, Wck Rck, Does the power supply circuit operate normally?, Defect of Flash-ROM
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GSA-4167B, GSA-4165B, GSA-4168B specifications

LG Electronics has been a prominent name in the electronics industry, particularly known for its innovative optical storage solutions. Among its noteworthy products are the GSA-4167B, GSA-4165B, and GSA-4168B DVD writers, each showcasing a blend of advanced technology and user-friendly features tailored to meet diverse consumer needs.

The LG GSA-4167B stands out for its versatility and performance. This model supports a wide range of disc formats, including DVD-R, DVD+R, DVD-RW, DVD+RW, and dual-layer DVDs, enhancing its usability for various applications. With a generous writing speed of up to 16x for DVD+R and 8x for dual-layer DVDs, users can create and backup data efficiently. This device is equipped with LG’s Super Multi technology which allows it to read and write multiple formats, making it a perfect choice for users who wish to maximize their media experience without being restricted to a single format.

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On the other hand, the LG GSA-4168B is known for its advanced capabilities, particularly in terms of burning dual-layer DVDs. Supporting speeds up to 16x for standard DVDs and 4x for dual-layer formats, it combines speed with efficiency. This model incorporates LightScribe technology, enabling users to etch labels directly onto specially coated discs, adding a personal touch to data storage. Its efficient cooling system helps maintain performance during extensive usage, ensuring longevity and reliability.

All three models represent LG's commitment to quality and innovation in optical storage technology. With features such as Power Burn technology and Seamless Link, they provide users peace of mind during high-speed data transfers. Their compatibility with different operating systems further enhances their versatility, making them suitable for both home users and professionals. Overall, the GSA-4167B, GSA-4165B, and GSA-4168B are exemplary models that reflect LG Electronics' dedication to advancing technology and enhancing user experience in the realm of optical drives.
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