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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Note that if you don't find what you searched for, try it after a period of time; the site is a never ending job !

..............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!

©2010, 2011, 2012, 2013, 2014 Frank Sharp - You do not have permission to copy photos and words from this blog, and any content may be never used it for auctions or commercial purposes, however feel free to post anything you see here with a courtesy link back, btw a link to the original post here , is mandatory.
All posts are presented here for informative, historical and educative purposes as applicable within fair use. NOTHING HERE IS FOR SALE !

Monday 25 March 2019

SHARP DV-HR300 _ DV-HR350 H _ DV-HR350X _ TROUBLESHOOTING CHART _ DVD VIDEO RECORDER

SHARP DV-HR300 _ DV-HR350 H_ DV-HR350X _ TROUBLESHOOTING CHART _ DVD VIDEO RECORDER




TROUBLESHOOTING

LCD display does not light up.


YES


Is 5V applied to IC8001 pin 37?
NO
Check STANDBY_5V line.
YES


Is RESET signal released on IC8001 pin 36 (5V)?

NO
Check line between IC501 and IC8001 pin 36.
YES


Is 38KHz oscillation signal output on IC8001 pin 41?

NO
Check R8037 C8016, IC8001 and peripheral circuits.
YES


Are the following signals input to each pin of IC8001?
IC8001 pin 44 LCD_DATA
IC8001 pin 43 LCD_CLK
IC8001 pin 42 LCD_CS


NO
Check lines between pins of IC501 and IC8001.
IC501 pin 13 ® IC8001 pin 44 FIP DATA
IC501 pin 11 ® IC8001 pin 43 FIP CLK
IC501 pin 12 ® IC8001 pin 42 FIP_CS
YES


Are the following signals input to each pin of LCD8003?
LCD8003 pin 33 COM1
LCD8003 pin 34 COM2
LCD8003 pin 35 COM3



NO
Check lines between pins of IC8001 and LCD8003 as well as IC8001. IC8001 pin 33 ® LCD8003 pin 33 COM1 IC8001 pin 34 ® LCD8003 pin 34 COM2 IC8001 pin 35 ® LCD8003 pin 35 COM3
YES


Check display tube and main unit.

NO
Check if display tube is damaged (cracked, etc.).



Operation keys do not work.


YES


Is key switch connected properly?
NO
Check or replace key switch.
YES


Is control voltage properly input to IC501 pin 87 and 88?


YES


Check or replace IC501 peripheral circuits.





Power does not turn on.


YES


Is fuse normal?
NO
Replace fuse. If the problem persists, refer to Flow chart No.18 "Fuse is blown".
YES


Is R903 normal?
NO
Is primary circuit part leaking or short-circuited?
(L901, D901, T901, IC901, etc.)
YES
NO
Is primary circuit part leaking or short-circuited?
(L901, D901, T901, IC901, etc.)
Are voltages on AT40V, AT14V, AT5V and AT-8V normal?
NO
Check rectification circuits of secondary side circuit.
YES


Is IC501 pin 1 at "H" level?
NO
Check power failure detection circuit (Q513 and IC506).




FUSE PROBLEM

CASE-1: Is primary circuit part leaking or short-circuited?
(L901, D901, T901, IC901, etc.)

CASE-2: Check the presence or absence of rectifier diode and
short circuit in the rectifier of the secondary circuit.
(D9001,9005,9007)



Power does not switch from "OFF" to ON".





Is AT5V normal?
NO
Refer to Flow chart No.17 "Power does not turn on".
YES


Is IC501 pin 94 at "H" level?
NO
Check IC501 peripheral circuits.
YES


Is ST_5V (STNDBY 5V) output?
NO
Check ST_5V SW circuit.
(Q9061, Q9062, etc.)
YES


Is IC501 pin 4 at "H" level?
NO
Check IC501 peripheral circuits.
YES


Is P-CON-H line at "H" level?
NO
Check IC508 peripheral circuits.
YES


Are AT_14V and PC_5V (1) output?
NO
Check AT_14V line and PC_5V (1) circuit.
YES


Check IC501 peripheral circuits.


Posted By: FRANK at 03:34
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