electronics, repairs, service manuals and datasheets discussion community for the repairs professionals and technicians
FAQSearchMembersGroupsRegisterProfilePM'sLogin/Out
KV25F2U standby light flashes twice - help
Goto page Previous  1, 2
 
Post new topic   Reply to topic    Electronic equipment repair and service manual search discussion Forum Index -> Equipment Repairs
View previous topic :: View next topic  
Author Message
gary



Joined: 05 Apr 2005
Posts: 584
Location: MANCHESTER, uk
PostPosted: Thu Dec 14, 2006 9:13 am    Post subject: Reply with quote
just replace the resistor, if that doesnt solve the problem check r602 150k, r616 123k, r620 470k, check voltage on pin 9 of cn902 should be low, if high protection is being triggered, have also had this voltage floating caused by micro but adding a 22k resistor to ground allowed me to trace it.
Back to top
View user's profile Send private message
Guest
PostPosted: Sun Dec 17, 2006 2:12 pm    Post subject: Reply with quote
gary wrote:
just replace the resistor,

I have replaced R608, same problem.
gary wrote:
if that doesnt solve the problem check r602 150k, r616 123k, r620 470k, check voltage on pin 9 of cn902 should be low, if high protection is being triggered.

r602 =76k
r616 = 71k
r620 = 400k
Note: I did not diconnect them from the board.

Pin 9 on CN902 = -0.62v
I also measured the pins with 9v and 33v labels:
9v = 1.49 volts
33v = 26.5volts

All these are around the Left Right Amp area of the of the board, do you suspect some thing there?

Also someone else was suggesting I "measure the collector coltage on the big transistor near the Line Transformer" What voltage should I get?

and also "does the heater come on?".
I guess the heater is the glass tube on the neck of the CRT? That does not come on. Could that be because the TV does not stay ON long enough for it to heat up? as its only on for 2 seconds.

I have also noticed that in that 2 seconds there is only picture, no sound.

What else can I check next guys?
Back to top
Guest
PostPosted: Sun Dec 17, 2006 2:30 pm    Post subject: Reply with quote
Anonymous wrote:

Pin 9 on CN902 = -0.62v


Sorry, Pin 9, PROT = 0.89 volts
Back to top
gary



Joined: 05 Apr 2005
Posts: 584
Location: MANCHESTER, uk
PostPosted: Mon Dec 18, 2006 9:13 am    Post subject: Reply with quote
the crt heaters must be lit as the picture is briefly present so that idea can be ignored, the resistors need to be removed to check them,.
Back to top
View user's profile Send private message
roks



Joined: 10 Dec 2006
Posts: 3
PostPosted: Tue Dec 19, 2006 4:53 pm    Post subject: Reply with quote
gary wrote:
the resistors need to be removed to check them.

I was dreding you we're going to say this. I'll take them off and let you know.

Thanks gary
Back to top
View user's profile Send private message
roks



Joined: 10 Dec 2006
Posts: 3
PostPosted: Tue Dec 19, 2006 5:03 pm    Post subject: Reply with quote
Anonymous wrote:
H.OUT (Q5030) is shorted. (D board)
• +B PWM (Q5003) is shorted. (D board)
• IC9001,9002, 9003 is shorted.(C board)
check these out.


Guest, non of these can be found on the boards, are you sure you are refering me to the correct model and/or pcb?

Thanks
Back to top
View user's profile Send private message
Guest
PostPosted: Tue Jan 09, 2007 8:41 pm    Post subject: Reply with quote
Hi Gary,

Sorry mate, didnt have time to take out those resistors. However, I have noticed something else, the voltage on IC600 (STR-S6709).

The service manual says pin1 =173 volts.

During the 2 seconds of picture, voltage=142 volts.
After picture goes, voltage=28volts

This IC600 pin1 goes to a transformer, T601, which seems to bridge between the Primary and Secondary power supply.

Note:
The diagrams I have is of a PCB 1-659-827-16, but my TV PCB has 1-659-827-14, identical PCB but few components missing on mine.
Back to top
Display posts from previous:   
Post new topic   Reply to topic    Electronic equipment repair and service manual search discussion Forum Index -> Equipment Repairs All times are GMT
Goto page Previous  1, 2
Page 2 of 2

 
Jump to:  
You can post new topics in this forum
You can reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum


eServiceInfo on FB - Service Manuals Free Download - Service Diagrams

Free TV Schematics Download - HARDW.net - Pinout Master - Jabse Service Manual Search - Jabse.InK  - onTap.bg

SnimkiOt.com - Poblizo.com : пътешествия  

Latest Service Manuals : trc61 Realistic • IL50 Infinity • RRCD-4203PLL Grundig • ndc7002n Fairchild Semiconductor • IBM T41 LENOVO • mmbta55l mmbta56 Motorola • DF-075 Kyocera • RM-70 1 NOKIA • OEM Beko 4H194 [SCH] . Various • TX-32PK25D Panasonic •