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Johnnybgood2007
on January 1, 2008 2:16 PM
Larry how was your new year? I have a small question last time I told you, my sony tv kp-43ht20 was blinking six time and I didn't have my
remote rm-y908 to diagnostic my tv so I bought a sony remote rm-v202 but is not doing anything. The diagnostic can only be done with sony
remote rm-y908? Thank you Larry
mark peterson on January 2, 2008 5:15 PM
Ok I have a sony kp57hw40 i have removed the board(D) and cleand it with acetone Tv turns on sound ok picture ok for about 5 seconds then
shuts down error code 8 looks like solder joints are ok? should I replace flyback and if so what outher componits around the FB should I
replace caps resistors dioads ?? or check?? sorry did not finish highschool spelling is 1st grade level thanks larry for the help that You provide
You r the man....mark
mark peterson on January 2, 2008 5:15 PM
Ok I have a sony kp57hw40 i have removed the board(D) and cleand it with acetone Tv turns on sound ok picture ok for about 5 seconds then
shuts down error code 8 looks like solder joints are ok? should I replace flyback and if so what outher componits around the FB should I
replace caps resistors dioads ?? or check?? sorry did not finish highschool spelling is 1st grade level thanks larry for the help that You provide
You r the man....mark
mark peterson on January 2, 2008 5:15 PM
Ok I have a sony kp57hw40 i have removed the board(D) and cleand it with acetone Tv turns on sound ok picture ok for about 5 seconds then
shuts down error code 8 looks like solder joints are ok? should I replace flyback and if so what outher componits around the FB should I
replace caps resistors dioads ?? or check?? sorry did not finish highschool spelling is 1st grade level thanks larry for the help that You provide
You r the man....mark
projects4joe on January 2, 2008 9:51 PM
Hi Larry,
I was given a Sony KP51WS500 last month. Previous owner said a service tech told him the Blue bulb was going bad. I setup the TV and it showed a nice picture for
about 5-10 seconds, then the screen when blue, then shut off. (The blue bulb was lit). Then the standby light started blinking 8 times repeatedly.
I purchased a refurbed D board from Sony for $175 and installed it today thinking that was the issue after viewing prior comments and seeing the Blue bulb lit, but the
above issue still persists. What could be the issue? Is there a way to test the blue bulb without having to purchase one? Why would it lite at all if it is bad?
Looking forward to your response! And please send me the manual for this set, if you have it projects4joe@gmail.com!
Joe
justin nichols on January 3, 2008 9:58 PM
I'm looking for a schematic for an 51hw40 or 57hw40. My email is justin.e.nichols@gmail.com
I just aquired a sony 51hw40 and I suspect it has a bad flyback transformer. the symtom is 6 blinks, no picture, and the power supply chirps
then goes into protection. I checked voltages coming off the power supply and found that the +/- 22v and +/- 15v were high and the 135v b+
was slightly low. I disconnected the 135v line and the tv powered on and stayed on and the power supply voltages went back to normal which
indicates a problem with the D board. I removed the pcb and started probing for shorts but was unable to find any. It seems that the
horizontal drive and hi-voltage power suppy are 2 seperate circuts on opposite sides of the D board so I decided to disconnect one and try to
isolate where the short is. I disconnected L8011 which feeds the high voltage p.s. and tested. the tv powered up with a different error code.
In looking more closely I found that the FET that drives the flyback also drives another transformer (T8004) which supplies 200v and
filament voltages to the video boards. I also noticed that these two transformers were running parallel to each other. figuring that T8004
would keep a load on the circut I removed the flyback and powered the tv on again. this time I had filaments on the picture tubes. I didn't
really expect that since there seems to be a referance wire coming from the HV splitted block that that p.s. relies on for regulation and
protection, at least I thought. Anyways I put the flyback transformer back and one by one started disconnecting picture tubes to make sure
none were shorted. As far as I can tell none were.
I would not consider myself an expert on tv repair. I'm a computer tech by trade but I like to tinker and I have enough experience to know
my way around a chassis.
Larry, this is a crazy long thread and I appreciate ppl like you that take the time to try and help.
Anyways my questions are. Do you agree that this may be a shorted flyback and If not is there anything else I should check. I don't like
replacing boards, If the D board can be repaired I want to repair it. My other question is about the retrace lines of death. It seems that the
picture tube are prone to failure on this model. Is this something to be worried about being that I've never seen this tv with a picture.
thanks for your time
justin nichols on January 5, 2008 1:38 AM
Hi Joe,
I couldn't help but notice you're post so I'm gonna reply. With a picture tube you could get an internal short and still have it be "lit". the
question is, when the screen goes blue, do you see retrace lines, (lines running horizontally across the screen at a slight angle). If you do,
there's a good chance of a short or at least leakage in the picture tube. It's a hard thing to test for because like a capacitor, alot of times the
short will only appear with a load........or overload (current leakage). The picture tube could also be hitting it's cut off point due to the
insulation materials breaking down inside it. maybe you should try turning down the screen voltage for the blue tube. It's an adjustment on
the focustat block. (a black block with six adjustments, 3 for focus, and 3 for screen voltages. If it's anything like my tv, It will be behind the
speaker grill and be the bottom left adjustment on the block for blue. you might try turning it counter clockwise a quarter of a turn and see
what happens. of course it would throw your color off so you'd be doing some adjusting to get color cal right. I'm not sure what goes wrong
with these tubes but it's not uncommon to get a heater-cathode short.
It could also be a failing cap on the video board. a shorted coupling cap might cause somthing like that. The tv I'm using now is an RCA 52"
hi def that had a shorted coupling cap that was wreaking havoc on the green gun. that was another case of the tv shop telling the customer