Toshiba CX32D70 picture=horizontal line


	FORUM HOME	SEARCH POSTS	WHO'S ONLINE	LOG IN	RULES F.A.Q.

TV Forums: TV Equipment: TV Repair Forum:
Toshiba CX32D70 picture=horizontal line

Print Thread

snackwell1953
New User

May 7, 2008, 9:12 AM

Post #1 of 5 (97 views)
Shortcut

Toshiba CX32D70 picture=horizontal line	Can't Post

Hi, I have two Toshiba CX32D70 TVs purchased within one month of each other. Both failed within a month a decade later. One has the picture squashed into a single bright horizontal line across the middle of the screen (sound is fine), the other has an unstable picture that is sometimes full, but other time shrinks vertically or shrinks completely into the same bright horizontal line. I can usually restore the picture for a short period of time by gently banging on the top of the set.

Since they both failed similarly, I am wondering if anyone knows if this is a known specific problem with this model and what the fix might involve, both partwise and ~ service cost. I can solder components, swap chips, etc., but I cannot diagnose and would need to have a repair tech to my house as these are VERY heavy.

Thanks!--if this appeared earlier in the forum, I get a Server Error when using the model #

Jeff

techchris
Veteran

May 7, 2008, 12:41 PM

Post #2 of 5 (89 views)
Shortcut

Re: [snackwell1953] Toshiba CX32D70 picture=horizontal line [In reply to]	Can't Post

resolder the vertical scan ic which should solve the problem on the intermittent tv and maybe the other one.if it does not then the ic may need to be changed.also check the low voltage supply diode and series resistor to the ic from the flyback transformer.it should be about 25-35 volts, this sometimes fails when the ic goes faulty.

snackwell1953
New User

May 8, 2008, 7:06 PM

Post #3 of 5 (70 views)
Shortcut

Re: [techchris] Toshiba CX32D70 picture=horizontal line [In reply to]	Can't Post

Hi Chris,
Thanks so much for the help. I can definitely solder loose pins or swap out a chip. Being a total novice with TVs, and without a service manual or schematic, what is my best bet for finding the vertical IC? After that, I gotta call someone, I think. Hope that keeps these two TV's out of the landfill for a little while longer.
Jeff

(This post was edited by snackwell1953 on May 8, 2008, 7:08 PM)

techchris
Veteran

May 9, 2008, 2:25 AM

Post #4 of 5 (55 views)
Shortcut

Re: [snackwell1953] Toshiba CX32D70 picture=horizontal line [In reply to]	Can't Post

the vertical ic will be mounted on a finned heatsink on the same board as the big flyback transformer, and usually has between 5 and 8 pins. i dont have the manual so i dont know the position number,but its not hard to spot as it is mounted vertically as opposed to flat on the board.

rrobor
Veteran

May 12, 2008, 7:12 AM

Post #5 of 5 (31 views)
Shortcut

Re: [snackwell1953] Toshiba CX32D70 picture=horizontal line [In reply to]	Can't Post

Just to add to the advice, If you find the chip you think it is, read the number. IE LA7838 or TDA3654 etc and post that on Google that will tell you the chip function.

Print Thread

Search for (options)

Web Design by Web Ideas - Page loaded in: 0.16 s on (CGI/1.1)