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!

©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 !

Tuesday 19 February 2019

TOSHIBA 26HL83 32-HL83 LCD TV POWER SUPPLY SHUT DOWN

TOSHIBA 26HL83 32-HL83 LCD TV POWER SUPPLY SHUT DOWN

     The power supply used in these models televisions contained on two PCB assemblies.  They are [1] Main Switching Power  and [2] low B (DD power module) power boards.  These two power supply boards are serviceable to board level only.
     P801 is the AC input to the power supply and is fused by F001.  P803 is a tuner ground on the power PCB.  It is occupied by a green slide on connector rooted to the tuner area.  P802 is a jumper between points located in the AC input.
     P802 is used in non US models requiring the product to have a mechanical AC switch.    In this model PE02 is on the power supply board but it is not used.  This plug is available for ATSC ready models using Digital Board.
     P804 is the supply for LCD.  The following table illustrates voltages and resistances that should be measured to Cold Ground at P804.


Pin
Voltage
Resistance to Cold Ground
1
3.2V
90K
2
5V
11K
3
3.3V
55K
4
3.2V
46K
5
0V
0
6
0V
0
7
9V
>500 OHMS
8
9V
>500 OHMS
9
0V
0
10
0V
0
11
5V
>500 OHMS
12
5V
>500 OHMS
     The resistance readings may vary depending on the instruments used to measure them, but a reading significantly below what is listed above indicates a problem and should be checked.
SHUTDOWN
     Shutdown on the receiver will, in most cases related to a thermal cause, one of the power supply lines, or power supply panels themselves.  It will be indicated by a blinking of Power LED.
     When a blinking LED symptom is observed, check the fans for rotation first.  If there is no or only a partial rotation of either fan, check the voltage sources for them, then change the fan/s if necessary.  If the fan voltage sources are incorrect, suspect problem with a Low B power supply panel.
     If nothing related to fans or thermal shutdown is detected, since the unit is serviced to modular level, use the voltage and resistance values located in the above chart to detect other possible modular problems.
Posted By: FRANK at 06:14
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