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 !

Friday, 29 March 2019

PIONEER PLASMA TV - SCAN BOARD & IC TROUBLESHOOTING - SCAN IC REPLACEMENT PROCEDURE

PIONEER PLASMA TV - Scan Board & IC Troubleshooting - Scan IC replacement procedure

Scan Board & IC Troubleshooting Pioneer Plamsa TV _ Scan IC Removal & Re-installation _ Pioneer Plasma TV
Almost all plasma displays will have same circuit configuration; irrespective of its brand name.
  First determine which scan board has the problem by doing a diode check between VH and GNDH after disconnecting the ribbon cable between the Y drive and the upper and lower scan assembly.  To some panels, you have to remove the blue glue by using flux remover or acetone. Measure between the output pins of the scan ICs and the bus bar on the scan board using either an analogue meter or a digital meter in manual mode.  All outputs on all scan ICs should measure about the same resistance [between 300 to 600Ohms].  If not, that IC is defective.  Remove it and then re-check VH.  There can be more than one bad scan IC.
Checking drives and Scan ICs.
  Do not operate with any connectors unplugged.  Replacing scan ICs in home is not recommended.  If scan board is disconnected, be sure to isolate buss bar also.  Discharge all scan board connections including buss before reconnecting.  Unplug power connector from the X or Y drive.  Perform diode check with DVM from Vsus to ground.  Should check as a diode.  If Y drvie is horted, next unplug scan PCBs.  If short goes away, check scan ICs.  If still shorted, replace the drive.
With scan PCB unplugged, perform diode check from Vh to Psus [bus bar].  Should check as a diode.  Ifg shorted, check the resistance from Vh and Gndh [buss bar] to HVxxx (each IC has 2 test pads).  Should measure 3 to 5 Meg Ohms.  Remove IC that measures different from other and recheck.  If all check is the same, but Vh is still shorted, check all 64HV pins of each IC.  Remove side rail, and 32 feed throughs are accessible near the panel connection.  If nothing shows up, loosen Scan PCB and flip over to access all 64 connections.
How to replace the SCAN ICs
There are two methods
With a nozzle type soldering station
With the CHIPQUICK SMD1 removal kit
With nozzle type disordering station
Mount the right type of nozzle.
Add solder to all pins of the defective SCAN IC
Heat up all pins with the nozzle. When solder reflows, remove IC with pick up tool.
Remove IC and clean PCB. Check PCB for damaged patterns and short-circuits.
Once the IC is positioned, tip it diagonal so it cannot move anymore.  Solder two opposite corners.
Solder all pins and check very carefully for dry joints or short circuits.
With Chipquick
Another way to remove SMDs is with a special solder made by Chip Quik.The solder is an alloy of tin, lead, indium, and bismuth. Bismuth has a very low thermal conductivity. If it is mixed with tin, the melting point is reduced to 65°C. and so it becomes difficult to damage the PCB . Another advantage is that there is no additional desolder equipment required.  It can be ordered with part number SMD1. This package contains chipquick flux , chipquick solder and alcohol pads.
Apply flux to all pins of the defective SCAN IC.
Adjust the temperature of the solder iron to +/- 200°C and melt CHIPQUICK alloy uniformly on all pins.
Maintain the alloy in molten state and remove the SCAN IC with a pick - up tool.
Move the excess with the solder iron to an unused section of the PCB.  Remove after it is cooled down.
Clean site with swab dipped in flux while applying heat.
At room temperature, clean the residue with alcohol pad.
PCB is ready to mount the new SCAN IC
How to remove the coating of SCAN IC.
Peel the coating a little at the lower left corner of the SCAN IC which has rather more coating. (be careful not to damage the pattern.)
Make a notch at the peeled coating.
Pick up the peeled coating by tweezers, and wind them around the point of the tweezers while rotating tweezers.
Peel off the coating while rotating tweezers along the SCAN IC After all the coating around the SCAN IC is peeled off continue.
After removing the larger portion of blue glue with a pair of tweezers, spray the IC pins with flux remover and scrub with soft brush.  Let stand and repeat several times to remove and soften the glue under the IC.
When positive all blue glue has been removed from the leads and underside, proceed to the removal steps. [Glue not removed from the IC pins or underneath chip could result in a damaged PC board at the time of IC removal.]
Posted By: FRANK at 03:26
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