REPAIRING AND NOT THROWING AWAY

REPAIRING AND NOT THROWING AWAY

Richtige Fernseher haben Röhren!

Richtige Fernseher haben Röhren!

In Brief: On this site you will find pictures and technical information about Service Modes, Circuit Diagrams, Firmware Update procedure, Disassemble procedure, Universal remote control set-up codes, Troubleshooting and more....

If you go into the profession, you will obtain or have access to a variety of tech tips databases HERE IT IS Master Electronics Repair !.

These are an excellent investment where the saying: 'time-is-money' rules. However, to learn, you need to develop a general troubleshooting approach - a logical, methodical, method of narrowing down the problem. A tech tip database might suggest: 'Replace C536' for a particular symptom. This is good advice for a specific problem on one model. However, what you really want to understand is why C536 was the cause and how to pinpoint the culprit in general even if you don't have a service manual or schematic and your tech tip database doesn't have an entry for your sick TV or VCR.

While schematics are nice, you won't always have them or be able to justify the purchase for a one-of repair. Therefore, in many cases, some reverse engineering will be necessary. The time will be well spent since even if you don't see another instance of the same model in your entire lifetime, you will have learned something in the process that can be applied to other equipment problems.
As always, when you get stuck, checking out a tech-tips database may quickly identify your problem and solution.In that case, you can greatly simplify your troubleshooting or at least confirm a diagnosis before ordering parts.

Happy repairing!
Today, the West is headed for the abyss. For the ultimate fate of our disposable society is for that society itself to be disposed of. And this will happen sooner, rather than later.

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..............The bitterness of poor quality is remembered long after the sweetness of todays funny gadgets low price has faded from memory........ . . . . . .....
Don't forget the past, the end of the world is upon us! Pretty soon it will all turn to dust!

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All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Tuesday, 5 February 2019

HOW TO TROUBLESHOOT LG DP132 DVD VIDEO PLAYER

How to troubleshoot LG DP132 DVD Video Player

DP132 LG DVD player - Troubleshooting
NO BOOTING WHEN YOU TURN THE UNIT ON
When you plug power cord and turn the unit on, LED light won’t turn red, the unit won’t
read disc normally.
Check every output voltage.
1) Please check if output voltage 3.3 V from main board Q4 C polarity is normal.
è If output voltage 3.3 V is not normal, please check the working status of SMPS board.
2) Please check if output voltage 5 V from main board XP9 pin11 is normal.
è If output voltage 5 V is not normal, please check the working status of SMPS board.
3) Please check if output voltage 1.2 V from main board Q5 C polarity is normal.
è If output voltage 1.2 V is not normal, please check the working status of main board Q5
When you plug power cord and turn the unit on, LED light won’t turn red, the unit won’t
read disc normally.
Check main board IC U1 signal and its peripheral circuit.
1) Please check if output voltage 3.3 V from U1 pin4, pin32, pin78, pin83 is normal.
è If output voltage 3.3 V is not normal, please check 3.3 V power circuit of main board.
2) Please check if output voltage 1.2 V from U1 pin10, pin77, pin86 is normal.
è If output voltage 1.2 V is not normal, please check 1.2 V power circuit of main board.
3) Please check if oscillating frequency 27 MHz of main board Y2 crystal is normal.
è If oscillating frequency 27 MHz is not normal, please check if Y2 and its peripheral circuit is in failure.
4) Please check if frequency 135 MHz of U1 pin31 RAM_CLK is normal.
è If oscillating frequency 135 MHz is not normal, please check if U1 is in failure.
When you plug power cord and turn the unit on, LED light won’t turn red, the unit won’t read disc normally.
Check main board IC U2 signal and its peripheral circuit.
1) Please check if output voltage 3.3 V from IC U2 pin1, 3, 9, 14, 27, 43, 49 is normal.
=>If output voltage 3.3 V is not normal, please check 3.3 V power circuit of main board.
Check every signal connected between IC U2 and IC U1, especially including DATA and ADDRESS signal.
=> If DATA and ADDRESS signal is not normally output, please check if U2 is in failure.
When you plug power cord and turn the unit on, LED light won’t turn red, the unit won’t read disc normally.
Check main board IC U3 signal and its peripheral circuit.
1) Please check if output voltage 3.3 V from IC U3 pin8 is normal.
è If output voltage 3.3 V is not normal, please check 3.3 V power circuit of main board.
2) Please check every signal connected between IC U3 and IC U1, especially including CE,DATA and CLK signal.
è If CE, DATA and CLK signal is not normally output, please check if U3 is in failure.
When you plug power cord and turn the unit on, LED light won’t turn red, the unit won’t read disc normally.
Please check main board IC U4 singal and its peripheral circuit.
1) Please check if output voltage 5 V from U4 pin8, pin19 is normal.
=> If output voltage 5 V is not normal, please check 5 V power circuit of main board.
2) Please check every singal connected between IC U4 and IC U1, especially including F+, F-, T+, T-,SP+, SP-, SL+, SL- signal to drive MD.
=> If F+, F-, T+, T-, SP+, SP-, SL+, SL- signal is not normally output, please check if U4 is in failure.
NO VIDEO OUTPUT WHEN YOU TURN THE UNIT ON
When you plug power cord and turn the unit on, LED light will turn red, the unit will read disc normally, but it won’t have video output.
1. Please check the solder joint status of main board connector P1.
è If P1 has cold solder joint, P2 pins should be oxidized, and please replace P1.
2. Please check CVBS signal of main board IC U1 pin69.
è If CVBS signal is not normally output, please check if U1 is in failure.
NO AUDIO OUTPUT WHEN YOU TURN THE UNIT ON
When you plug power cord and turn the unit on, LED light will turn red, the unit will read disc normally, but it won’t have audio output.
1. Please check the solder joint status of main board connector P1.
è If P1 has cold solder joint, P1 pins should be oxidated, and please replace P1.
2. Please check the working status of main board IC U927.
è If output voltage 5 V from U927 pin7 is not normal, please check 5 V power circuit of main board.
ÖIf AL and AR signal from U927 pin1, pin2, pin9, pin10 is not normally output, please check if U927 is in failure.
3. Please check the working status of main board IC U1.
è If AL and AR signal from U1 pin65, pin66 is not normally output, please check if U1 is in failure.
Posted By: FRANK at 07:08
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