| Author |
Message |
Clarence
Joined: 08 Mar 2006
Posts: 3827
Location: Smith Mtn Lake, VA
|
| Posted: Fri Jul 11, 2008 2:52 am Post subject: family room RPTV Akai PTH-5498 blue geometry went wacko |
|
|
We have an Akai PTH-5498 (mfg Apr 2003) 54" 1080i CRT RPTV in the family room.
Here are the bookmark pages that I have. We bought it at Sam's Club 5 years ago. It's a rebadged Samsung, so the Sammy service codes work on it:
http://forum.ecoustics.com/cgi-bin/bbs/discus.pl?pg=prev&topic=2&page=1526
| Quote: | Service Menu: Power "off" the TV and then hit the buttons in the following order mute, 1, 8, 2, and then Power "on" and once the projection turns on you should be faced with a new menu if not do that over again and make sure the power is off.Use the volume and channel buttons to navigate and change vaules.
NOTE: once you do this any settings you already done, such as picture and the time will be reset every time you enter the service menu.Make sure you write down ALL info you have done already and make sure you write ALL settings you see once in the service menu,You do this at your own risk.If you want to make a change but to be safe just change the VML setting to "0" and hit the add/erase button to save then power off to exit, turn back on the tv and reset your picture and etc settings back and notice a truer picture.
For a 56 point convergence, it's the same as the Samsung except this time the power is left on to punch in the code.Remember with this menu to exit you hit the "S.Mode" button.You can find the instructions at the link below but I reccomend if you're skiddish on doing any advanced tech service to your tv, call an ISF calibrator after you've broke it in(100 to 150 hours):
http://www.keohi.com/keohihdtv/brandspecific/samsung/samsung_convergence.html |
Samsung Secret Service Mode Convergence:
http://www.keohi.com/keohihdtv/brandspecific/samsung/samsung_convergence.html
| Quote: | I have a Samsung HCJ552W (a 55" widescreen, HDTV-ready RPTV), and I have a "tip" that is closely related to your posted tip about the service menu.
Normally, my set permits convergence only by aligning a cross-hair pattern in the center of the screen. Unfortunately, converging the center of the screen does not work for the entire screen, and the set does not have any type of "automated" convergence routine.
To enter the full-blown convergence mode, one must press mute (with power on or off) and then press 183. A convergence grid appears on screen and the remote control permits the user to adjust convergence on any particular intersection in the grid. I cannot remember off the top of my head what all the buttons on the remote do in this mode, but the service manual does have a "map" of the remote buttons when used in this convergence mode. If necessary, I could provide more info about this map because I have used the remote for convergence many times.
When in convergence mode, pressing the "1" button on the remote causes the convergence settings to revert to factory "zero" (i.e., no convergence compensation), pressing the "2" button causes the convergence settings to revert to the factory default (terrible settings on my TV), and pressing "3" causes the convergence settings to revert to the previously saved settings. Also, saving the settings requires pressing the "Add/Erase" button under the sliding cover on the bottom half of the remote. I can't provide any more than that in the time I've got, but these "keys" will help." |
I don't watch it much, but the kids have it on all day. Last week I noticed a yellow blob in the left corner. Today I walk by and the whole picture is wacko.
I've found the secret service menus before and tweak the convergence about once a year. But this is well beyond what can be fixed by convergence. It looks like the blue grid has collapsed... like it needs massive top/bottom PIN adjustment (AFAIK, there is no PIN adj on this set.)
The blue doesn't really respond well to basic convergence... some points move, some don't, some move opposite of the cursor direction.
R&G still work fine... both main menu conv and service mode conv.
I did a unplug and wait 30 sec reset. No change.
I did a service menu RESET. No change (other than resetting CONV to factory default as expected).
I've never opened the chassis. Does this look like a hardware issue (beyond what can be fixed via service menu)?
| Description: |
|
| Filesize: |
123.72 KB |
| Viewed: |
22315 Time(s) |
|
|
|
| Back to top |
|
 |
Brooklyn
Joined: 17 Sep 2007
Posts: 494
Location: Morgan Hill, CA
|
| Posted: Fri Jul 11, 2008 3:04 am Post subject: |
|
|
|
Possible one of the convergence IC's has gone. This happens to my friend's sony, and it was repairable. You just need to be good with an iron. The IC was like $15.
|
|
| Back to top |
|
|
Clarence
Joined: 08 Mar 2006
Posts: 3827
Location: Smith Mtn Lake, VA
|
| Posted: Fri Jul 11, 2008 3:13 am Post subject: |
|
|
Yep, I think you're right.
Here's a thread where someone's Red went wacko the same way...
http://forum.ecoustics.com/bbs/messages/2/300719.html
| Tad Whittom wrote: | | I've had my Akai for a couple years and it has been great! However, my kids turned it on this morning and the picture is all messed up. It looks like the convergence is completely shot. I can get into the convergence menu with the "Mute 183" and I see the red lines are way out of whack. It has been about a year or better since I last adjusted this. How do you switch between the different colored guns? It pulls up green first; how do I get to red? What would cause my tv to suddenly lose it's convergence settings? Thanks |
| steve starr wrote: | | Your red convergence output IC has failed. Trying to adjust it isn't going to help. |
|
|
| Back to top |
|
|
Clarence
Joined: 08 Mar 2006
Posts: 3827
Location: Smith Mtn Lake, VA
|
| Posted: Fri Jul 11, 2008 3:15 am Post subject: |
|
|
More notes to myself...
http://www.techlore.com/forum/thread/21787/akai-5498-focus-or-convergence/
| sixtyyearsyoung wrote: | akai 5498 focus or convergence
have a 5 year-old set that recently lost the red gun convergence, but, thanks to you guys, was able to fix the problem by replacing the board and redoing the convergence. |
| kroakinmike wrote: | Akai pth5498 repair
I just replaced the convergence board on my Akai model PTH5498 rear projection TV using part number aa9501846d as recommended on fixya.com |
http://www.techlore.com/forum/thread/19105/AKAI-PTH5498-convergance/?highlight=pth5498
| Larry Dillon wrote: | | What you need to do, if you have any experience working on solid state printed circuit boards, is to replace both of the STK392-040 convergence correction amp IC's. These Inc's go bad in a lot of TV sets. They both need to be replace together. But look on the printed circuit board first and see if you see any liquid on the convergence board or any other board around. If not proceed to the convergence IC's. But if you do see any liquid, or any indication of any oily substance, repair the gaskets on the picture tubes first or replace the picture tubes. This could be a very costly proposition. I would recommend to go HERE http://www.electronic-repair-kits.com/STK392-040.htm to find the right replacement IC's. You want to make sure you only replace the IC's with true Sanyo parts. there are a lot of peeps out there selling the Sanyo rejects that do not last very long, so if the IC's you get do not say Sanyo on them, send them back! If you have no solid state repair experience, play it safe and call out a pro to assist you in this repair. |
ERK-500 Kit contains total 2-pcs
SANYO 100% ORIGINAL ONLY
Part Number: STK392-040-E (LEAD FREE)
Manufacture: Sanyo
Category: Hybrid IC
Description: TV Convergence IC
Information: 3 - Channel Correction Circuit
2 for $27.95
Last edited by Clarence on Fri Jul 11, 2008 3:22 am; edited 1 time in total
|
|
| Back to top |
|
|
macgyver655
Joined: 22 Aug 2007
Posts: 8508
|
| Posted: Fri Jul 11, 2008 3:19 am Post subject: |
|
|
|
Hey Clarence. Its a good possibility the the convergence IC's went bad or have bad solder joints. A quick search shows that your tv uses STK392-040 ic's which currently dont have an upgrade so would have to be replaced with the same. On some occasions, other parts can be damaged as well when these ic's go out. Parts aren't very expensive, but replacing them takes a little skill. If you do decide to replace them make sure you get original Sanyo ic's. After market ones will surely go out in a very short time if not immediately.
|
|
| Back to top |
|
|
Clarence
Joined: 08 Mar 2006
Posts: 3827
Location: Smith Mtn Lake, VA
|
| Posted: Fri Jul 11, 2008 3:24 am Post subject: |
|
|
Thanks... that's concurs with the info I was adding in to my notes above.
$27.95 for a pair of Sanyo OEM IC's: http://www.electronic-repair-kits.com/STK392-040.htm
Not too bad.
I'll see if Wallace or MP will do the soldering for me.
Why are there 2?
One for up/down and one for left/right?
It seems like there'd be 3... one for R,G,B.
|
|
| Back to top |
|
|
Brooklyn
Joined: 17 Sep 2007
Posts: 494
Location: Morgan Hill, CA
|
| Posted: Fri Jul 11, 2008 3:28 am Post subject: |
|
|
|
On my friends sony I think there were only 2 as well. I don't know how the tasks distributed between them though.
|
|
| Back to top |
|
|
macgyver655
Joined: 22 Aug 2007
Posts: 8508
|
| Posted: Fri Jul 11, 2008 3:33 am Post subject: |
|
|
|
3 channels per chip. red horz = channel 1, red vert = channel 2 and so on. 1 color is split between the 2 ic's for horz and vert. Dont forget there maybe other parts damaged from the chip going out. Resistors in the convergence circuit and fuses in the power supply section. Good luck.
|
|
| Back to top |
|
|
Clarence
Joined: 08 Mar 2006
Posts: 3827
Location: Smith Mtn Lake, VA
|
| Posted: Fri Jul 11, 2008 3:39 am Post subject: |
|
|
http://www.bluestar-online.com/STK392_040_p/stk392-040.htm
Our Price: $8.49
Quantity in Stock: 856
Availability: Usually Ships in 24 Hours
Product Code: STK392-040
Description: Convergence Correction Circuit Three Channel in a Single Package(Maximum Output Current:6A)
but this one doesn't say "Sanyo OEM"
| Description: |
|
| Filesize: |
21.23 KB |
| Viewed: |
22273 Time(s) |
|
|
|
| Back to top |
|
|
Clarence
Joined: 08 Mar 2006
Posts: 3827
Location: Smith Mtn Lake, VA
|
| Posted: Fri Jul 11, 2008 3:46 am Post subject: |
|
|
Cheap and nearby on ebay:
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=370066312848
Shipping costs: US $5.00
Each Additional Item: FREE
Item location: Baltimore, MD, United States
Quantity: 2339 available
Does anyone know how to tell if these are Sanyo OEM?
Also, why are the numbers different in the top-right corner?
| Description: |
|
| Filesize: |
21.74 KB |
| Viewed: |
22269 Time(s) |
|
| Description: |
|
| Filesize: |
18.42 KB |
| Viewed: |
22269 Time(s) |
|
|
|
| Back to top |
|
|
macgyver655
Joined: 22 Aug 2007
Posts: 8508
|
| Posted: Fri Jul 11, 2008 3:46 am Post subject: |
|
|
Probably after market. Avoid it like the plague. 
|
|
| Back to top |
|
|
Clarence
Joined: 08 Mar 2006
Posts: 3827
Location: Smith Mtn Lake, VA
|
|
| Back to top |
|
|
Clarence
Joined: 08 Mar 2006
Posts: 3827
Location: Smith Mtn Lake, VA
|
| Posted: Fri Jul 11, 2008 3:55 am Post subject: |
|
|
http://www.freelists.org/archives/techassist/12-2005/msg00744.html
| Dale Lubow at Harris TV wrote: | I have a Samsung HCN4226W with the red convergence bad. I ordered
2-STK392-040 from Tritronics and the packages they came in said Sanyo
original IC. Before I did anything I verified the problem again. The red
convergence was very distorted. I then examined and checked the resistors on
the convergence board. Everything checked OK. I first just replaced the one
STK392-040 that had the red drivers in it just to see if it would take care
of the problem. ResistorsRZ123,124,125, 126 started smoking and the little
pico fuse went out. Then I stuck the original STK back in it and replaced
the pico fuse(resistors were still ok). I was back to my original distorted
red convergence. I though maybe I got a bad new IC so I tried the 2nd one I
ordered and it started burning the same resistors again. I have to concluded
the IC's I got from Tritronics are not compatible with the originals. They
look the same with the Sanyo name on it and the rest of the numbers in the
same places. I re-estimated the original 1201-001225 Samsung IC's to my
customer because I know they should work OK. I looked through the previous
posts but I didn't see any problem like this listed. Has anyone else had any
similar problems? I usually feel safe with Sanyo originals in this
application, but now I am not so sure?
TIA
Dale
--
Dale A. Lubow CET
Harris TV & Appliance
335 Lincoln Way
Ames, IA 50010
515-232-1109 (Voice)
515-232-3356 (Fax)
HarrisTV@xxxxxxxxx |
http://www.freelists.org/archives/techassist/12-2005/msg00811.html
| Robert wrote: | I used two stk392-040e from tritronics last friday in the same Samsung model
HLN4226XA?XAA they both worked well.
They were original Sanyo IC's the "E" means lead free.
I paid $15.89 each for the IC's
By the way the module BP94-00155A with the ic's is only $64 outright from Samsung.
Robert
tvservice@xxxxxxxxxxxxx
H & H Electronics Inc
http://supertek.igniteinc.biz |
|
|
| Back to top |
|
|
Clarence
Joined: 08 Mar 2006
Posts: 3827
Location: Smith Mtn Lake, VA
|
|
| Back to top |
|
|
Clarence
Joined: 08 Mar 2006
Posts: 3827
Location: Smith Mtn Lake, VA
|
| Posted: Tue Sep 16, 2008 12:09 am Post subject: |
|
|
Just to close the loop for the archives, when the part above arrived, I popped the back off of the TV and knew immediately that it wasn't the right part. It had the two STK392-040's, but the rest of the board was 8x larger than the Sub Deflection Board in my TV.
So I kept googling until I found the correct board... PCB CONVERGENCE AMP:
http://www.samsungparts.com/part_detail.asp?catalog%5Fname=Parts+and+Accessories&category%5Fname=&product%5Fid=BP94%2D00155A
$89
It arrived today. Popped it in, did a complete reset and reconvergence from the Service Menu (Off, Mute, 1, 8, 2, Power On, Mute, 1, 8, 3). It has never looked better.
Anybody need a Samsung AA95-01846D ?
|
|
| Back to top |
|
|
Stacks
Joined: 29 Dec 2011
Posts: 1
|
| Posted: Thu Dec 29, 2011 10:37 pm Post subject: |
|
|
I'm in the same boat you were in at the time of this post, not sure if you still check this form, but if you do, shoot me an email, i will buy that board off you 
|
|
| Back to top |
|
|
wallace123456
Joined: 14 Aug 2006
Posts: 2236
Location: Northwest VA area
|
| Posted: Fri Dec 30, 2011 4:36 pm Post subject: |
|
|
Clarence,
You don't want me to mess around with the soldering; I'll destroy it! I have not even replaced my burnt out iron.
This stuff is a piece-of-cake for Mac, MP and Craig.
wallace
_________________
Life Is Good, But BBQ Is Better! BBQ Competition Team
|
|
| Back to top |
|
|
|
|
